20221135 Ver 2_TriWest Business Center Stormwater Report 2023.02.21_20230224

OAK
E N G I N E E R I N G
STORMWATER MANAGEMENT
DESIGN REPORT
FOR
TRIWEST BUSINESS CENTER
DAVIE COUNTY, NORTH CAROLINA
io •,�•
SEAL
• 045345
�. GAF •:cam I N���' ����
2/21 /2023
OAK ENGINEERING
4929 MONROE RD
CHARLOTTE, NC 28205
NC FIRM LICENSE: P-1742

OAK
E N G I N E E R I N G
TABLE OF CONTENTS
I. NARRATIVE
INTRODUCTION
STORMWATER MANAGEMENT REQUIREMENTS
EXISTING SITE CONDITIONS
PROPOSED SITE CONDITIONS
PROPOSED BMP DESIGN
CONCLUSIONS
II. MAPS AND FIGURES
HYDROCAD MODEL ROUTING DIAGRAM
USGS LOCATION MAP
DRAINAGE AREA MAPS
DAVIE COUNTY RAINFALL DATA
SOILS MAP
FEMA FIRM MAP
III. HYDROCAD MODEL OUTPUT
HYDROCAD: 1-INCH STORM EVENT
HYDROCAD: IYR-24HR STORM EVENT
HYDROCAD: 2YR-24HR STORM EVENT
HYDROCAD: 1 OYR-24HR STORM EVENT
HYDROCAD: 25YR-24HR STORM EVENT (PONDS ONLY)
HYDROCAD: 50YR-24HR STORM (PONDS ONLY)
HYDROCAD: 100YR-24HR STORM (PONDS ONLY)

OAK
E N G I N E E R I N G
INTRODUCTION
Mocksville Development Partners, LLC is proposing the construction of an industrial park in Davie County, North Carolina. The
proposed improvements will include four (4) industrial buildings totaling approximately 1,895,360-sf with trailer parking and
vehicular parking spaces. Davie County does not have any stormwater management requirements and the project is not in a
designated Phase II area. However, because there are proposed wetland impacts requiring 4011404 permitting, the site is
subject to State Stormwater permitting. The stormwater design will be phased with the development of the park. In this initial
phase, two (2) wet ponds are proposed to meet the State Stormwater permitting requirements listed below.
STORM WATER MANAGEMENT REQUIREMENTS
Davie County Stormwater Management Requirements
1. None
NCDEQ State Stormwater Management Requirements
1. Must provide 85% reduction (by weight) in the export of total suspended solids (TSS) on an average annual basis.
2. Must provide peak control for the 1 YR-24HR storm event.
The NCDEQ Storm water Design Manua/was used as the basis for the water quality BMP design. Two (2) wet detention ponds
were used to provide the required treatment for the proposed improvements.
EXISTING SITE CONDITIONS
The 201.14 acre site is primarily used for agricultural uses. The site has three (3) distinct outfalls that will be studied for
pre/post detention. Soils on the site vary but are predominantly Hydrologic Soil Group C soils.
See the Maps & Figures section of this report for Drainage Area and Soils Maps.

OAK
E N G I N E E R I N G
PROPOSED SITE CONDITIONS
As previously mentioned, the proposed improvements will include four (4) industrial buildings totaling approximately
1,895,360-sf with trailer parking and vehicular parking spaces. Phase 1 improvements will include one building, vehicle
parking, a truck court and a public road totaling 615,292-sf of built -upon area. The Phase 1 impervious area will be treated
by two wet ponds (Pond #2 and Pond #3). Three (3) outfalls will be studied for pre/post runoff control.
PREDEVELOPMENT
SUMMARY A.
• (flows
J
CV
J
M
J
<
<
<
w
>
O
O
O
L
°
ne
ne
V
0-
0-
1 " WQ
1 0.08
0.14
0.03
1 yr-24hr
30.23
43.88
10.46
2yr-24hr
47.44
67.67
16.42
10yr-24hr
101.03
140.95
34.97
25yr-24hr
136.02
188.46
47.08
50yr-24hr
165.22
227.99
57.19
100yr-24 h r
195.38
268.73
67.63
POST DEVELOPMENT A'(flows
CV
M
w
O
O
O
V)
V)
V)
°
O
O
O
1 " WQ
1.69
1.00
0.26
1 yr-24hr
19.08
5.57
3.15
2yr-24hr
27.83
8.62
4.37
10yr-24hr
75.87
40.69
9.64
25yr-24hr
106.71
76.54
24.25
50yr-24hr
164.14
101.65
35.56
100yr-24 h r
197.79
127.81
44.16
*PRE/POST QUANTITIES ARE FOR FULL BUILDOUT OF THE PARK

OAK
E N G I N E E R I N G
MAPS & FIGURES
HYDROCAD MODEL ROUTING DIAGRAM
USGS LOCATION MAP
DRAINAGE AREA MAPS
DAVIE COUNTY RAINFALL DATA
SOILS MAP
FEMA FIRM MAP

PRE (OUTFALL WEST)
12S
POST T
POND 1
13P
17S
UNDET INED POST
TO UTFALL 1
POND
18
POST - OUTFALL #1
PRE (OUTFALL #1)
PRE (OUTFALL #2)
6S
PRE (OUTFALL #3)
3S 7S 9S
POST T POND 2 POST T POND 3 POST T POND 4
A 8P Aop
POND 2 PO D 3 POND 4
11P � 19S
POST - OUTFALL #2 UNDETAINED POST
TO OUTFALL 2
Subcat Reach on Link
14S
POST T POND 6
15P
POST - OUTFA L #3
20S
7UN ETAINED POST
TO OUTFALL 3
21P
POST - OUTFALL #3

12
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NOAA Atlas 14, Volume 2, Version 3,
Location name: Mocksville, North Carolina, USA"
Latitude: 35.9565°, Longitude:-80.5232°
Elevation: 719.2 ft""
*source: ESRI Maps
(D ** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
0.368 0.436 0.512 0.566 0.628 0.670 0.708 0.743 0.782 0.810
5-min
(0.340-0.400) (0.404-0.475) (0.473-0.557) (0.520-0.614) (0.574-0.682) (0.608-0.729) (0.639-0.772) (0.665-0.813) (0.690-0.860) (0.706-0.895)
0.588 0.698 0.820 0.905 1.00 1.07 1.13 1.18 1.24 1.27
10-min
(0.543-0.638) (0.645-0.759) (0.757-0.893) (0.831-0.983) (0.915-1.09) 1 (0.969-1.16) 11 (1.01-1.23) 1 (1.05-1.29) 1(1.09-1.36) (1.11-1.41)
0.735 0.877 1.04 1.14 1.27 F 1.42 1.49 1.56 1.60
15-min
(0.679-0.798) (0.811-0.954) (0.957-1.13) 1 (1.05-1.24) 11 (1.16-1.38) 1 (1.28-1.55) 1 (1.33-1.63) 11 (1.37-1.71) 1 (1.40-1.77)
1.01 1.21 1.47 1.66 1.88 2.03 2.18 2.31 2.48 2.59
30-min
(0.931-1.09) (1.12-1.32) (1.36-1.60) (1.52-1.80) (1.72-2.04) (1.85-2.21) (1.97-2.38) (2.07-2.53) (2.19-2.73) (2.26-2.87)
1.26 1.52 1.89 2.16 2.50 2.76 3.00 3.24 3.56 3.78
60-min
(1.16-1.36) (1.41-1.65) 11 (1.74-2.06) (1.98-2.35) (2.29-2.72) (2.50-3.00) (2.71-3.27) (2.90-3.55) (3.14-3.91) (3.30-4.18)
1.48 1.79 2.24 2.58 3.02 3.37 3.70 4.04 4.49 4.83
2-hr
(1.36-1.60) (1.65-1.95) 1 1 (2.37-2.80) (2.76-3.28) (3.05-3.66) (3.32-4.04) (3.59-4.42) (3.93-4.94) (4.17-5.34)
1.58 1.91 2.40 2.77 3.27 3.66 4.05 4.44 4.98 5.39
3-hr
(1.46-1.72) (1.77-2.09) (2.22-2.62) (2.55-3.02) (2.98-3.56) (3.31-3.98) (3.63-4.42) (3.94-4.86) (4.34-5.48) (4.63-5.96)
1.93 2.33 2.92 3.39 4.00 4.50 5.00 5.50 6.20 6.74
6-hr
(1.78-2.11) (2.15-2.55) (2.69-3.19) (3.10-3.69) (3.65-4.36) (4.06-4.89) (4.47-5.44) (4.87-6.00) (5.39-6.79) (5.78-7.41)
2.31 2.79 3.51 4.07 4.84 5.46 6.09 6.74 7.64 8.35
12-hr
(2.13-2.52) (2.57-3.06) (3.23-3.83) (3.73-4.44) (4.40-5.26) (4.91-5.92) (5.43-6.61) (5.94-7.32) (6.62-8.30) (7.11-9.08)
3.27
3.95
4.92
5.68
6.71
7.52
8.34
9.19
10.3
11.2
2-day
(3.04-3.52)
(3.67-4.25)
11 (4.58-5.30)
1 (5.27-6.11)
(6.20-7.21)
(6.93-8.09)
(7.67-8.98)
(8.41-9.90)
(9.42-11.2)
3.48
4.19
5.20
5.99
7.05
7.90
8.76
9.64
10.8
11.8
3-day
(3.25-3.74)
(3.91-4.50)
(4.84-5.59)
(5.57-6.43)
(6.53-7.58)
(7.30-8.49)
(8.06-9.42)
(8.84-10.4)
(9.89-11.7)
(10.7-12.8)
3.69
4.43
5.47
6.29
7.40
8.28
9.18
10.1
11.4
12.3
4-day
(3.45-3.96)
(4.14-4.76)
(5.11-5.88)
(5.87-6.75)
(6.87-7.94)
(7.66-8.89)
(8.46-9.87)
(9.27-10.9)
4.22
5.05
6.14
6.99
8.15
9.06
9.99
10.9
12.2
13.2
7-day
(3.96-4.52)
(4.73-5.40)
(5.75-6.57)
(6.54-7.48)
(7.60-8.72)
(8.43-9.70)
(9.26-10.7)
(10.1-11.7)
4.82
5.74
6.91
7.81
9.00
9.94
10.9
11.8
13.1
14.1
10-day
(4.55-5.14)
(5.42-6.11)
11 (6.51-7.35)
(7.34-8.30)
(8.45-9.57)
(9.31-10.6)
(10.2-11.6)
(11.0-12.6)
6.49
7.67
9.06
10.2
11.6
12.8
13.9
15.1
16.6
17.8
20-day
(6.15-6.86)
(7.26-8.10)
(8.57-9.58)
(9.59-10.7)
(10.9-12.3)
(12.0-13.5)
(13.0-14.7)
(14.1-16.0)
(15.4-17.7)
(16.5-19.0)
8.04
9.45
10.9
12.1
13.6
14.7
15.8
16.9
18.3
19.4
30-day
(7.66-8.44)
(9.01-9.92)
(10.4-11.5)
(11.5-12.7)
(12.9-14.2)
(13.9-15.4)
(14.9-16.6)
(15.9-17.8)
(17.2-19.3)
(18.2-20.5)
10.1
11.8
13.5
14.7
16.3
17.6
18.7
19.9
21.4
22.5
45-day
(9.69-10.6)
(11.3-12.4)
11 (12.9-14.1)
1 (14.1-15.4)
11 (15.6-17.1)
1 (17.8-19.6)
1 (18.9-20.8)
12.1
14.1
15.9
17.2
18.9
20.2
21.5
22.7
24.2
25.3
60-day
(11.6-12.6)
(13.5-14.7)
(15.2-16.5)
(16.5-17.9)
(18.1-19.7)
(19.3-21.1)
(20.5-22.4)j
I (24.0-26.6)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a
given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical

NOAA Atlas 14, Volume 2, Version 3,
Location name: Mocksville, North Carolina, USA"
Latitude: 35.9565°, Longitude:-80.5232°
Elevation: 719.2 ft""
*source: ESRI Maps
(D ** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)1
Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min
4.42
(4.08-4.80)
5.23
(4.85-5.70)
6.14
(5.68-6.68)
7.54
(6.89-8.18)
8.04
(7.30-8.75)
8.50
(7.67-9.26)
8.92
(7.98-9.76)
9.38
(8.28-10.3)
9.72
(8.47-10.7)
3.53
4.19
4.92
5.43
6.00
6.40
6.75
7.07
7.42
7.65
10-min
(3.26-3.83)
(3.87-4.55)
(4.54-5.36)
(4.99-5.90)
(5.49-6.52)
(5.81-6.96)
(6.09-7.36)
(6.32-7.73)
(6.55-8.17)
(6.67-8.46)
2.94
3.51
4.15
4.58
5.07
5.40
5.69
5.94
6.23
6.40
15-min
(2.72-3.19)
(3.24-3.82)
(3.83-4.52)
(4.21-4.97)
(4.64-5.51)
(4.91-5.88)
(5.13-6.20)
(5.32-6.50)
(5.50-6.85)
(5.58-7.08)
2.02
2.42
2.95
3.32
3.76
4.07
4.36
4.63
4.96
5.18
30-min
(1.86-2.19)
(2.24-2.64)
(2.72-3.21)
(3.05-3.60)
(3.44-4.08)
(3.70-4.43)
(3.93-4.75)
(4.14-5.06)
(4.37-5.45)
(4.52-5.73)
1.26
1.52
1.89
2.16
2.50
2.76
3.00
3.24
3.56
3.78
60-min
(1.16-1.36)
(1.41-1.65) 11
(1.74-2.06)
(1.98-2.35)
(2.29-2.72)
(2.50-3.00)
(2.71-3.27)
(2.90-3.55)
(3.14-3.91)
(3.30-4.18)
0.738
0.894
1.12
1.29
1.51
1.68
1.85
2.02
2.25
2.42
2-hr
(0.680-0.800)
(0.824-0.973)1
1 (1.18-1.40) 11
(1.38-1.64)
1 (1.52-1.83) 11
(1.66-2.02)
(1.80-2.21)
0.526
0.637
0.800
0.924
1.09
F 1.35
1.48
1.66
1.79
3-hr
(0.486-0.572)
(0.589-0.696)
(0.738-0.872)
1 (0.848-1.00) 11
(0.992-1.19)
(1.10-1.33)
(1.21-1.47)
(1.31-1.62)
(1.45-1.82)
0.322
0.389
0.488
0.565
0.669
0.751
0.834
0.919
1.04
1.13
6-hr
(0.297-0.352)
(0.360-0.425)
(0.450-0.533)
(0.518-0.615)
(0.609-0.727)
(0.679-0.817)
(0.746-0.908)
1 (0.813-1.00) 11
(0.900-1.13)
(0.965-1.24)
0.192
0.232
0.291
0.338
0.402
0.453
0.505
0.560
0.634
0.693
12-hr
(0.177-0.209)
(0.214-0.254)
(0.268-0.318)
(0.310-0.368)
(0.365-0.437)
(0.408-0.491)
(0.451-0.548)
(0.493-0.607)
(0.549-0.689)
(0.590-0.754)
0.117
0.141
0.178
0.207
0.246
0.277
0.310
0.343
0.389
0.425
24-hr
(0.109-0.126)
(0.131-0.153)
(0.165-0.192)
(0.191-0.223)
(0.227-0.266)
(0.255-0.300)
(0.284-0.335)
(0.313-0.371)
(0.353-0.421)
(0.384-0.461)
0.068
0.082
0.103
0.118
0.140
0.157
0.174
0.191
0.215
0.234
2-day
(0.063-0.073)
(0.076-0.089)
(0.095-0.110)
(0.110-0.127)
(0.129-0.150)
(0.144-0.168)
(0.160-0.187)
(0.175-0.206)
(0.196-0.233)
(0.213-0.253)
0.048
0.058
0.072
0.083
0.098
0.110
0.122
0.134
0.151
0.164
3-day
(0.045-0.052)
(0.054-0.063)
(0.067-0.078)
(0.077-0.089)
(0.091-0.105)
(0.101-0.118)
(0.112-0.131)
(0.123-0.144)
(0.137-0.163)
(0.149-0.177)
0.038
0.046
0.057
0.066
0.077
0.086
0.096
0.105
0.118
0.129
4-day
(0.036-0.041)
(0.043-0.050)
(0.053-0.061)
(0.061-0.070)
(0.072-0.083)
(0.080-0.093)
(0.088-0.103)
(0.097-0.113)
(0.108-0.128)
(0.117-0.139)
0.025
0.030
0.037
0.042
0.049
0.054
0.059
0.065
0.073
0.079
7-day
(0.024-0.027)
(0.028-0.032)
(0.034-0.039)
(0.039-0.045)
(0.045-0.052)
(0.050-0.058)
(0.055-0.064)
(0.060-0.070)
(0.067-0.078)
(0.072-0.085)
0.020
0.024
0.029
0.033
0.038
0.041
0.045
0.049
0.055
0.059
10-day
(0.019-0.021)
(0.023-0.025)
(0.027-0.031)
(0.031-0.035)
(0.035-0.040)
(0.039-0.044)
(0.042-0.048)
(0.046-0.053)
(0.051-0.058)
(0.054-0.063)
0.014
0.016
0.019
0.021
0.024
0.027
0.029
0.031
0.035
0.037
20-day
(0.013-0.014)
(0.015-0.017)
(0.018-0.020)
(0.020-0.022)
(0.023-0.026)
(0.025-0.028)
(0.027-0.031)
(0.029-0.033)
(0.032-0.037)
(0.034-0.040)
0.011
0.013
0.015
0.017
0.019
0.020
0.022
0.023
0.025
0.027
30-day
(0.011-0.012)
(0.013-0.014)
(0.014-0.016)
(0.016-0.018)
(0.018-0.020)
(0.019-0.021)
(0.021-0.023)
(0.022-0.025)
(0.024-0.027)
(0.025-0.028)
0.009
0.011
0.012
0.014
0.015
0.016
0.017
0.018
0.020
0.021
45-day
(0.009-0.010)
(0.010-0.011)
(0.012-0.013)
(0.013-0.014)
(0.014-0.016)
(0.015-0.017)
(0.016-0.018)
(0.017-0.019)
(0.019-0.021)
(0.020-0.022)
0.008
0.010
0.011
0.012
0.013
0.014
0.015
0.016
0.017
0.018
60-day
(0.008-0.009)
(0.009-0.010)
(0.011-0.011)
(0.011-0.012)
(0.013-0.014)
(0.013-0.015)
(0.014-0.016)
(0.015-0.016)
(0.016-0.018)
(0.017-0.018)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a
given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical

Hydrologic Soil Group —Davie County, North Carolina
542100 542200 542300 542400 542500 542600 542700 542800 542900 543000 543100 543200 543300 543400 543500 543600
35° 57'41"N
r
rn
r
r
CAw`m
r.
a�
Qom+ r
d —
� I -
9 � -
8 1 VM2 II o .
- '
s
8
158
T
Mm
T'ry �R1
i
- 4
8
Soil I MaN may not IOe Maliel at this scale.
35° 5T4"N
I I I
542100 542200 542300 542400 542500 542600 542700 542800 542900 543000 543100 543200 543300 543400 543500 543600
Map Scale: 1:5,530 if printed on B landscape (17" x 11") sheet.
$ Meters N
0 50 100 200 300
Feet
0 250 500 1000 1y00
Map projection: Web Mercator Comereoordinates: WGS84 Edge tics: UTM Zone 17N WGS84
uson Natural Resources Web Soil Survey
islino Conservation Service National Cooperative Soil Survey
W700 543800 5439M
W700 543800 5439M
o
544000
1 35° 5741" N
8
r
8
8
3
35° 574" N
544000 544100
M
o
11 /2/2022
Page 1 of 4

Hydrologic Soil Group —Davie County, North Carolina
MAP LEGEND
Area of Interest (AOI)
0
Area of Interest (AOI)
Soils
Soil Rating
Polygons
0
A
0
A/D
0
B
0
B/D
C
0
C/D
0
D
0
Not rated or not available
Soil Rating
Lines
r 0
A
r 0
A/D
B
B/D
N 0
C
r 0
C/D
r 0
D
r 0
Not rated or not available
Soil Rating
Points
0
A
0
A/D
0
B
0
B/D
❑ C
0 C/D
0 D
❑ Not rated or not available
Water Features
Streams and Canals
Transportation
— Rails
­0 Interstate Highways
US Routes
Major Roads
Local Roads
Background
D6 Aerial Photography
MAP INFORMATION
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Davie County, North Carolina
Survey Area Data: Version 20, Sep 8, 2022
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Mar 13, 2022—May
9, 2022
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
usoA Natural Resources Web Soil Survey 11/2/2022
Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group —Davie County, North Carolina
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
CoA
Codorus loam, 0 to 2
B/D
9.4
5.7%
percent slopes,
frequently flooded
KnA
Kinkora loam, 0 to 2
C/D
9.0
5.4%
percent slopes,
occasionally flooded
MsB
Mocksville sandy loam,
B
5.1
3.1 %
2 to 8 percent slopes
MsC
Mocksville sandy loam,
B
29.1
17.6%
8 to 15 percent slopes
OkB2
Oak Level clay loam, 2
C
44.5
26.8%
to 8 percent slopes,
moderately eroded
RaB
Rasalo fine sandy loam,
C
65.6
39.6%
2 to 8 percent slopes
Ud
Udorthents, loamy
C
0.1
0.1 %
W
Water
3.0
1.8%
Totals for Area of Interest
166.8
100.0%
USDA Natural Resources Web Soil Survey 11/2/2022
Conservation Service National Cooperative Soil Survey Page 3 of 4

64TOJ 1 oI
May 12, 2022 1:15,835
0 0.125 0.25 0.5 mi
Parcels Stream
0 0.2 0.4 0.8 km
2 foot contours
5 foot contours
Sources: Esn, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri
Japan, METI, Esn China (Hong Kong), Esn Korea, Esri (Thailand), NGCC, (c)
Ope nSt re etM a p contributors, and th e G I S User Community
2022

Legend
Panels
0 Political Areas
Stream Centerline
Cross Sections
TTTTr Levee
Flood Hazard Areas
AE
FIoodway (AE)
0.2 % Chance Annual Flood Hazard
Future Conditions 1%Annual Chance Flood Hazard
North Carolina Floodplain Mapping Program
'tea,.

OAK
E N G I N E E R I N G
WET POND DESIGN

Drainage Area = 19.79 ac 85 %
% Impervious = 74.23 %
Try Perm. Pool Depth = 5.0
SA/DA=
Surface Area Req'd = 0.410 ac :. • sf
Area Provided = 0.472 ac • . • sf
at Elev = 710.50
VOL prov'd perm pool= 2.09 ac-ft (includes Forebay)
Avg Depth = ft
USE SIMPLE METHOD
Rv=0.05+0.009(I)
Rv= • :• IN/IN
P= 1.0 IN
VOLUME=DESIGN RAINFALL(Rv)DA
VOLUME= = AC -FT
VOLprov= AC -FT
PRE -BAY VOL=20% OF PERM POOL VOLUME
PRE -BAY VOLregd= 0.418 ac-ft
PRE -BAY VOLprov.= 0.386 ac-ft
Actual % Used = 1 185 1%
51,584 CF
at elevation E
2 DAY DRAWDOWN Q2= • • cfs
5 DAY DRAWDOWN= Q5= cfs
FROM ORIFICE CALC'S: USE IN DIA ORIFICE
Approx Draw Down Time = �Z! days
hours
onnce
Mountain & Piedmont Regions
Table 10-1
SA/DA RATIO CHART (for 85% TSS removal)
% imp cover avg. permanent pool depth (ft)
3
4
5
6
7
8
9
10
0.51
0.43
0.37
0.30
0.27
0.25
20
0.84
0.69
0.61
0.51
0.44
0.40
30
1.17
0.94
0.84
0.72
0.61
0.56
40
1.51
1 1.24
1.09
0.91
0.78
0.71
50
1.79
1.51
1.31
1.13
0.95
0.87
60
2.09
1.77
1.49
1.31
1.12
1.03
70
2.51
2.09
1.80
1.56
1.34
1.17
80
2.92
2.41
2.07
1.82
1.62
1.40
90
3.25
2.64
2.31
2.04
1.84
1.59
Coastal Region
Table 10-3
SA/DA RATIO CHART (for 90% TSS removal)
% imp cover avg. permanent pool depth (ft)
3.0 4.0 5.0 6.0 7.0 8.0 9.0
10
0.78
0.61
0.44
0.00
0.00
0.00
20
1.48
1.04
0.87
0.70
0.52
0.35
30
2.18
1.65
1.39
1.13
0.87
0.70
40
2.96
2.26
1.83
1.39
0.96
0.78
50
3.65
2.87
2.35
1.83
1.31
0.96
60
4.35
3.31
2.78
2.26
1.74
1.13
70
5.22
3.92
3.22
2.52
1.83
1.31
80
5.92
4.52
3.65
2.78
1.91
1.57
90
6.53
5.05
4.18
2.96
2.44174
a Q=cA(29h)^.5 w/ c=.6
DIA (in) 4.5
Inv = • •
(cfs)
Elev Q
Top 1 " Stor =
Perm. Pool = • •
Head = •
Avg Q = • cfs
Page 1 of 1

Drainage Area = 15.26 ac 85 %
% Impervious = 72.15 %
Try Perm. Pool Depth = 3.0
SA/DA=
Surface Area Req'd = 0.450 ac • • • sf
Area Provided = 0.508 ac sf
at Elev = 701.50
VOL prov'd perm pool= 1.51 ac-ft (includes Forebay)
Avg Depth = ft
USE SIMPLE METHOD
Rv=0.05+0.009(I)
Rv= • ••• IN/IN
P= 1.0 IN
VOLUME=DESIGN RAINFALL(Rv)DA
VOLUME= • :: • AC -FT
VOLprov= • •� AC -FT
PRE -BAY VOL=20% OF PERM POOL VOLUME
PRE -BAY VOLregd= • • ac-ft
PRE -BAY VOLprov.= • • • ac-ft
Actual % Used = %
38,740 CF
at elevation E
2 DAY DRAWDOWN Q2= cfs
5 DAY DRAWDOWN= Q5= • • • cfs
FROM ORIFICE CALC'S: USE IN DIA ORIFICE
Approx Draw Down Time = �7■ days
hours
onnce
Mountain & Piedmont Regions
Table 10-1
SA/DA RATIO CHART (for 85% TSS removal)
% imp cover avg. permanent pool depth (ft)
3
4
5
6
7
8
9
10
0.51
0.43
0.37
0.30
0.27
0.25
20
0.84
0.69
0.61
0.51
0.44
0.40
30
1.17
0.94
0.84
0.72
0.61
0.56
40
1.51
1 1.24
1.09
0.91
0.78
0.71
50
1.79
1.51
1.31
1.13
0.95
0.87
60
2.09
1.77
1.49
1.31
1.12
1.03
70
2.51
2.09
1.80
1.56
1.34
1.17
80
2.92
2.41
2.07
1.82
1.62
1.40
90
3.25
2.64
2.31
2.04
1.84
1.59
Coastal Region
Table 10-3
SA/DA RATIO CHART (for 90% TSS removal)
% imp cover avg. permanent pool depth (ft)
3.0 4.0 5.0 6.0 7.0 8.0 9.0
10
0.78
0.61
0.44
0.00
0.00
0.00
20
1.48
1.04
0.87
0.70
0.52
0.35
30
2.18
1.65
1.39
1.13
0.87
0.70
40
2.96
2.26
1.83
1.39
0.96
0.78
50
3.65
2.87
2.35
1.83
1.31
0.96
60
4.35
3.31
2.78
2.26
1.74
1.13
70
5.22
3.92
3.22
2.52
1.83
1.31
80
5.92
4.52
3.65
2.78
1.91
1.57
90
6.53
5.05
4.18
2.96
2.44174
a Q=cA(29h)^.5 w/ c=.6
DIA (in) 4.5
Inv = • •
(cfs)
Elev Q
Top 1 " Stor = • •
Perm. Pool = • •
Head = •
Avg Q = •®. cfs
Page 1 of 1

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
1-INCH STORM EVENT

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr I" WQ Rainfall=1.00"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Summary for Subcatchment 3S: POST TO POND 2
Runoff = 8.62 cfs @ 11.97 hrs, Volume= 0.417 af, Depth= 0.25"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1" WQ Rainfall=1.00"
Area (ac) CN
Description
14.690 98
Impervious
5.100 61
>75% Grass cover, Good, HSG B
19.790 88
Weighted Average
5.100
25.77% Pervious Area
14.690
74.23% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 3S: POST TO POND 2
Hydrograph
I I I I - I'-- I' --'---'---'---'---'-- I' --'---'---'---'---'---'-- I' --'---'---'---'---'-- ■Runoff
9 8162 Cfs
-- - -- -- -- -- -- ----'ITypea12r-
8
-- - - I.17 VI Q Rainfa11T1.�00P'_
Runoff Arda=19.790 at
R4 n Off''I VQ 14 m6=0.41 � cjf
w Ru��noff �De-04-2-57 v 5
Tcm
4-
3-
2-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1"WQ Rainfall= 1. 00 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Hydrograph for Subcatchment 3S: POST TO POND 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.01
0.00
0.00
2.00
0.02
0.00
0.00
3.00
0.03
0.00
0.00
4.00
0.05
0.00
0.00
5.00
0.06
0.00
0.00
6.00
0.08
0.00
0.00
7.00
0.10
0.00
0.00
8.00
0.12
0.00
0.00
9.00
0.15
0.00
0.00
10.00
0.18
0.00
0.00
11.00
0.24
0.00
0.00
12.00
0.66
0.09
8.04
13.00
0.77
0.13
0.60
14.00
0.82
0.16
0.38
15.00
0.85
0.17
0.31
16.00
0.88
0.19
0.24
17.00
0.90
0.20
0.22
18.00
0.92
0.21
0.20
19.00
0.94
0.22
0.17
20.00
0.95
0.23
0.15
21.00
0.96
0.23
0.14
22.00
0.98
0.24
0.14
23.00
0.99
0.25
0.13
24.00
1.00
0.25
0.13
25.00
1.00
0.25
0.00
26.00
1.00
0.25
0.00
27.00
1.00
0.25
0.00
28.00
1.00
0.25
0.00
29.00
1.00
0.25
0.00
30.00
1.00
0.25
0.00
31.00
1.00
0.25
0.00
32.00
1.00
0.25
0.00
33.00
1.00
0.25
0.00
34.00
1.00
0.25
0.00
35.00
1.00
0.25
0.00
36.00
1.00
0.25
0.00
37.00
1.00
0.25
0.00
38.00
1.00
0.25
0.00
39.00
1.00
0.25
0.00
40.00
1.00
0.25
0.00
41.00
1.00
0.25
0.00
42.00
1.00
0.25
0.00
43.00
1.00
0.25
0.00
44.00
1.00
0.25
0.00
45.00
1.00
0.25
0.00
46.00
1.00
0.25
0.00
47.00
1.00
0.25
0.00
48.00
1.00
0.25
0.00
49.00
1.00
0.25
0.00
50.00
1.00
0.25
0.00
51.00
1.00
0.25
0.00
52.00
1.00
0.25
0.00
53.00
1.00
0.25
0.00
54.00
1.00
0.25
0.00
55.00
1.00
0.25
0.00
56.00
1.00
0.25
0.00
57.00
1.00
0.25
0.00
58.00
1.00
0.25
0.00
59.00
1.00
0.25
0.00
60.00
1.00
0.25
0.00
61.00
1.00
0.25
0.00
62.00
1.00
0.25
0.00
63.00
1.00
0.25
0.00
64.00
1.00
0.25
0.00
65.00
1.00
0.25
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
1.00
0.25
0.00
67.00
1.00
0.25
0.00
68.00
1.00
0.25
0.00
69.00
1.00
0.25
0.00
70.00
1.00
0.25
0.00
71.00
1.00
0.25
0.00
72.00
1.00
0.25
0.00
73.00
1.00
0.25
0.00
74.00
1.00
0.25
0.00
75.00
1.00
0.25
0.00
76.00
1.00
0.25
0.00
77.00
1.00
0.25
0.00
78.00
1.00
0.25
0.00
79.00
1.00
0.25
0.00
80.00
1.00
0.25
0.00
81.00
1.00
0.25
0.00
82.00
1.00
0.25
0.00
83.00
1.00
0.25
0.00
84.00
1.00
0.25
0.00
85.00
1.00
0.25
0.00
86.00
1.00
0.25
0.00
87.00
1.00
0.25
0.00
88.00
1.00
0.25
0.00
89.00
1.00
0.25
0.00
90.00
1.00
0.25
0.00
91.00
1.00
0.25
0.00
92.00
1.00
0.25
0.00
93.00
1.00
0.25
0.00
94.00
1.00
0.25
0.00
95.00
1.00
0.25
0.00
96.00
1.00
0.25
0.00
97.00
1.00
0.25
0.00
98.00
1.00
0.25
0.00
99.00
1.00
0.25
0.00
100.00
1.00
0.25
0.00
101.00
1.00
0.25
0.00
102.00
1.00
0.25
0.00
103.00
1.00
0.25
0.00
104.00
1.00
0.25
0.00
105.00
1.00
0.25
0.00
106.00
1.00
0.25
0.00
107.00
1.00
0.25
0.00
108.00
1.00
0.25
0.00
109.00
1.00
0.25
0.00
110.00
1.00
0.25
0.00
111.00
1.00
0.25
0.00
112.00
1.00
0.25
0.00
113.00
1.00
0.25
0.00
114.00
1.00
0.25
0.00
115.00
1.00
0.25
0.00
116.00
1.00
0.25
0.00
117.00
1.00
0.25
0.00
118.00
1.00
0.25
0.00
119.00
1.00
0.25
0.00
120.00
1.00
0.25
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr I" WQ Rainfall=1.00"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 3
Summary for Subcatchment 7S: POST TO POND 3
Runoff = 6.65 cfs @ 11.97 hrs, Volume= 0.322 af, Depth= 0.25"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1" WQ Rainfall=1.00"
Area (ac) CN
Description
11.010 98
Impervious
4.250 61
>75% Grass cover, Good, HSG B
15.260 88
Weighted Average
4.250
27.85% Pervious Area
11.010
72.15% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 7S: POST TO POND 3
Hydrograph
--I- I---I--+--+--+----------+--+--+--+--+--I--+--+--+--+--+--+-----I-- ■Runoff
7 6.65 Cfs
1--1--' J--1--1--L--T1gII2hr1_
'.1WQ RainfallT1.001
-- - -- -- -- -- -- -- -- Ru-hoff Arda:F5.2f0-a -
5 I I I I I
R4npff'IVQI�m'1e=0.$2� �f
----,----T---------------+--r------------+--r--
-----
---I--
4 Runoff 'IDepthT0.25"
LL
--I'I-- --III-- -- -- --III---III---III-- -- -- -- --'-----I'I---I'I--,- TC#&'IO-Trffl7-
3 CAN=8$
z 'I
'I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1"WQ Rainfall= 1. 00 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Hydrograph for Subcatchment 7S: POST TO POND 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.01
0.00
0.00
2.00
0.02
0.00
0.00
3.00
0.03
0.00
0.00
4.00
0.05
0.00
0.00
5.00
0.06
0.00
0.00
6.00
0.08
0.00
0.00
7.00
0.10
0.00
0.00
8.00
0.12
0.00
0.00
9.00
0.15
0.00
0.00
10.00
0.18
0.00
0.00
11.00
0.24
0.00
0.00
12.00
0.66
0.09
6.20
13.00
0.77
0.13
0.46
14.00
0.82
0.16
0.29
15.00
0.85
0.17
0.24
16.00
0.88
0.19
0.19
17.00
0.90
0.20
0.17
18.00
0.92
0.21
0.15
19.00
0.94
0.22
0.13
20.00
0.95
0.23
0.11
21.00
0.96
0.23
0.11
22.00
0.98
0.24
0.10
23.00
0.99
0.25
0.10
24.00
1.00
0.25
0.10
25.00
1.00
0.25
0.00
26.00
1.00
0.25
0.00
27.00
1.00
0.25
0.00
28.00
1.00
0.25
0.00
29.00
1.00
0.25
0.00
30.00
1.00
0.25
0.00
31.00
1.00
0.25
0.00
32.00
1.00
0.25
0.00
33.00
1.00
0.25
0.00
34.00
1.00
0.25
0.00
35.00
1.00
0.25
0.00
36.00
1.00
0.25
0.00
37.00
1.00
0.25
0.00
38.00
1.00
0.25
0.00
39.00
1.00
0.25
0.00
40.00
1.00
0.25
0.00
41.00
1.00
0.25
0.00
42.00
1.00
0.25
0.00
43.00
1.00
0.25
0.00
44.00
1.00
0.25
0.00
45.00
1.00
0.25
0.00
46.00
1.00
0.25
0.00
47.00
1.00
0.25
0.00
48.00
1.00
0.25
0.00
49.00
1.00
0.25
0.00
50.00
1.00
0.25
0.00
51.00
1.00
0.25
0.00
52.00
1.00
0.25
0.00
53.00
1.00
0.25
0.00
54.00
1.00
0.25
0.00
55.00
1.00
0.25
0.00
56.00
1.00
0.25
0.00
57.00
1.00
0.25
0.00
58.00
1.00
0.25
0.00
59.00
1.00
0.25
0.00
60.00
1.00
0.25
0.00
61.00
1.00
0.25
0.00
62.00
1.00
0.25
0.00
63.00
1.00
0.25
0.00
64.00
1.00
0.25
0.00
65.00
1.00
0.25
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
1.00
0.25
0.00
67.00
1.00
0.25
0.00
68.00
1.00
0.25
0.00
69.00
1.00
0.25
0.00
70.00
1.00
0.25
0.00
71.00
1.00
0.25
0.00
72.00
1.00
0.25
0.00
73.00
1.00
0.25
0.00
74.00
1.00
0.25
0.00
75.00
1.00
0.25
0.00
76.00
1.00
0.25
0.00
77.00
1.00
0.25
0.00
78.00
1.00
0.25
0.00
79.00
1.00
0.25
0.00
80.00
1.00
0.25
0.00
81.00
1.00
0.25
0.00
82.00
1.00
0.25
0.00
83.00
1.00
0.25
0.00
84.00
1.00
0.25
0.00
85.00
1.00
0.25
0.00
86.00
1.00
0.25
0.00
87.00
1.00
0.25
0.00
88.00
1.00
0.25
0.00
89.00
1.00
0.25
0.00
90.00
1.00
0.25
0.00
91.00
1.00
0.25
0.00
92.00
1.00
0.25
0.00
93.00
1.00
0.25
0.00
94.00
1.00
0.25
0.00
95.00
1.00
0.25
0.00
96.00
1.00
0.25
0.00
97.00
1.00
0.25
0.00
98.00
1.00
0.25
0.00
99.00
1.00
0.25
0.00
100.00
1.00
0.25
0.00
101.00
1.00
0.25
0.00
102.00
1.00
0.25
0.00
103.00
1.00
0.25
0.00
104.00
1.00
0.25
0.00
105.00
1.00
0.25
0.00
106.00
1.00
0.25
0.00
107.00
1.00
0.25
0.00
108.00
1.00
0.25
0.00
109.00
1.00
0.25
0.00
110.00
1.00
0.25
0.00
111.00
1.00
0.25
0.00
112.00
1.00
0.25
0.00
113.00
1.00
0.25
0.00
114.00
1.00
0.25
0.00
115.00
1.00
0.25
0.00
116.00
1.00
0.25
0.00
117.00
1.00
0.25
0.00
118.00
1.00
0.25
0.00
119.00
1.00
0.25
0.00
120.00
1.00
0.25
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1"WQ Rainfall= 1. 00 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Summary for Pond 2P: POND 2
Inflow Area = 19.790 ac, 74.23% Impervious, Inflow Depth = 0.25" for 1" WQ event
Inflow = 8.62 cfs @ 11.97 hrs, Volume= 0.417 of
Outflow = 0.27 cfs @ 15.55 hrs, Volume= 0.407 af, Atten= 97%, Lag= 214.5 min
Primary = 0.27 cfs @ 15.55 hrs, Volume= 0.407 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 710.95' @ 15.55 hrs Surf.Area= 22,150 sf Storage= 9,697 cf
Plug -Flow detention time= 672.7 min calculated for 0.407 of (98% of inflow)
Center -of -Mass det. time= 661.2 min ( 1,534.3 - 873.1 )
Volume Invert
Avail.Storage Storage Description
#1 710.50'
290,610 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.50
20,568
0 0
711.00
22,310
10,720 10,720
712.00
24,113
23,212 33,931
713.00
25,975
25,044 58,975
714.00
27,897
26,936 85,911
715.00
29,879
28,888 114,799
716.00
31,920
30,900 145,699
717.00
34,021
32,971 178,669
718.00
36,183
35,102 213,771
719.00
38,404
37,294 251,065
720.00
40,686
39,545 290,610
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.50'
4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Slotted Weirs X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=0.27 cfs @ 15.55 hrs HW=710.95' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 0.27 cfs of 9.08 cfs potential flow)
2=4.5" Orifice (Orifice Controls 0.27 cfs @ 2.49 fps)
3=Slotted Weirs ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.50' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr I" WQ Rainfall=1.00"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 6
'0=6 1 q1 A1•]N•y%
.....
-Inflow .0
• • .•
//////////////////////
• • • '//////
,iiii�
////////////////////////////////////////////////////////
-----

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.50
0.00
0.00
0.00
2.50
0.00
0
710.50
0.00
0.00
0.00
5.00
0.00
0
710.50
0.00
0.00
0.00
7.50
0.00
0
710.50
0.00
0.00
0.00
10.00
0.00
0
710.50
0.00
0.00
0.00
12.50
0.91
7,797
710.87
0.23
0.23
0.00
15.00
0.31
9,663
710.95
0.27
0.27
0.00
17.50
0.21
9,422
710.94
0.27
0.27
0.00
20.00
0.15
8,681
710.91
0.25
0.25
0.00
22.50
0.13
7,791
710.87
0.23
0.23
0.00
25.00
0.00
6,617
710.81
0.19
0.19
0.00
27.50
0.00
5,196
710.75
0.13
0.13
0.00
30.00
0.00
4,205
710.70
0.09
0.09
0.00
32.50
0.00
3,499
710.67
0.07
0.07
0.00
35.00
0.00
2,979
710.64
0.05
0.05
0.00
37.50
0.00
2,585
710.62
0.04
0.04
0.00
40.00
0.00
2,277
710.61
0.03
0.03
0.00
42.50
0.00
2,032
710.60
0.02
0.02
0.00
45.00
0.00
1,832
710.59
0.02
0.02
0.00
47.50
0.00
1,667
710.58
0.02
0.02
0.00
50.00
0.00
1,528
710.57
0.01
0.01
0.00
52.50
0.00
1,409
710.57
0.01
0.01
0.00
55.00
0.00
1,307
710.56
0.01
0.01
0.00
57.50
0.00
1,219
710.56
0.01
0.01
0.00
60.00
0.00
1,141
710.56
0.01
0.01
0.00
62.50
0.00
1,073
710.55
0.01
0.01
0.00
65.00
0.00
1,012
710.55
0.01
0.01
0.00
67.50
0.00
957
710.55
0.01
0.01
0.00
70.00
0.00
908
710.54
0.01
0.01
0.00
72.50
0.00
863
710.54
0.00
0.00
0.00
75.00
0.00
823
710.54
0.00
0.00
0.00
77.50
0.00
786
710.54
0.00
0.00
0.00
80.00
0.00
753
710.54
0.00
0.00
0.00
82.50
0.00
722
710.53
0.00
0.00
0.00
85.00
0.00
693
710.53
0.00
0.00
0.00
87.50
0.00
667
710.53
0.00
0.00
0.00
90.00
0.00
642
710.53
0.00
0.00
0.00
92.50
0.00
619
710.53
0.00
0.00
0.00
95.00
0.00
598
710.53
0.00
0.00
0.00
97.50
0.00
578
710.53
0.00
0.00
0.00
100.00
0.00
559
710.53
0.00
0.00
0.00
102.50
0.00
542
710.53
0.00
0.00
0.00
105.00
0.00
526
710.53
0.00
0.00
0.00
107.50
0.00
510
710.52
0.00
0.00
0.00
110.00
0.00
496
710.52
0.00
0.00
0.00
112.50
0.00
482
710.52
0.00
0.00
0.00
115.00
0.00
469
710.52
0.00
0.00
0.00
117.50
0.00
456
710.52
0.00
0.00
0.00
120.00
0.00
445
710.52
0.00
0.00
0.00
Type 1124-hr 1 " WQ Rainfall= 1. 00 "
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.50
0.00
0.00
0.00
710.60
0.03
0.03
0.00
710.70
0.09
0.09
0.00
710.80
0.18
0.18
0.00
710.90
0.25
0.25
0.00
711.00
0.30
0.30
0.00
711.10
0.34
0.34
0.00
711.20
0.38
0.38
0.00
711.30
0.42
0.42
0.00
711.40
0.45
0.45
0.00
711.50
0.48
0.48
0.00
711.60
0.51
0.51
0.00
711.70
0.54
0.54
0.00
711.80
0.56
0.56
0.00
711.90
0.59
0.59
0.00
712.00
0.61
0.61
0.00
712.10
0.63
0.63
0.00
712.20
0.65
0.65
0.00
712.30
0.68
0.68
0.00
712.40
0.70
0.70
0.00
712.50
0.72
0.72
0.00
712.60
0.74
0.74
0.00
712.70
0.75
0.75
0.00
712.80
0.77
0.77
0.00
712.90
0.79
0.79
0.00
713.00
0.81
0.81
0.00
713.10
0.83
0.83
0.00
713.20
0.84
0.84
0.00
713.30
0.86
0.86
0.00
713.40
0.88
0.88
0.00
713.50
0.89
0.89
0.00
713.60
0.91
0.91
0.00
713.70
0.92
0.92
0.00
713.80
0.94
0.94
0.00
713.90
0.95
0.95
0.00
714.00
0.97
0.97
0.00
714.10
0.98
0.98
0.00
714.20
1.00
1.00
0.00
714.30
1.01
1.01
0.00
714.40
1.02
1.02
0.00
714.50
1.04
1.04
0.00
714.60
1.05
1.05
0.00
714.70
1.07
1.07
0.00
714.80
1.08
1.08
0.00
714.90
1.09
1.09
0.00
715.00
1.10
1.10
0.00
715.10
2.03
2.03
0.00
715.20
3.71
3.71
0.00
715.30
5.89
5.89
0.00
715.40
8.46
8.46
0.00
715.50
11.38
11.38
0.00
715.60
13.69
13.69
0.00
715.70
15.53
15.53
0.00
715.80
17.13
17.13
0.00
715.90
18.57
18.57
0.00
716.00
19.90
19.90
0.00
716.10
21.14
21.14
0.00
716.20
22.31
22.31
0.00
716.30
23.41
23.41
0.00
716.40
24.46
24.46
0.00
716.50
25.47
25.47
0.00
716.60
26.43
26.43
0.00
716.70
27.36
27.36
0.00
716.80
28.26
28.26
0.00
716.90
29.13
29.13
0.00
717.00
29.97
29.97
0.00
Type 1124-hr 1 " WQ Rainfall= 1. 00 "
Printed 1/17/2023
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
717.10
30.80
30.80
0.00
717.20
31.59
31.59
0.00
717.30
32.37
32.37
0.00
717.40
33.13
33.13
0.00
717.50
33.87
33.87
0.00
717.60
34.60
34.60
0.00
717.70
35.31
35.31
0.00
717.80
36.00
36.00
0.00
717.90
36.69
36.69
0.00
718.00
37.36
37.36
0.00
718.10
39.67
39.67
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.50
20,568
0
710.60
20,916
2,074
710.70
21,265
4,183
710.80
21,613
6,327
710.90
21,962
8,506
711.00
22,310
10,720
711.10
22,490
12,960
711.20
22,671
15,218
711.30
22,851
17,494
711.40
23,031
19,788
711.50
23,212
22,100
711.60
23,392
24,430
711.70
23,572
26,778
711.80
23,752
29,144
711.90
23,933
31,529
712.00
24,113
33,931
712.10
24,299
36,352
712.20
24,485
38,791
712.30
24,672
41,249
712.40
24,858
43,725
712.50
25,044
46,220
712.60
25,230
48,734
712.70
25,416
51,266
712.80
25,603
53,817
712.90
25,789
56,387
713.00
25,975
58,975
713.10
26,167
61,582
713.20
26,359
64,208
713.30
26,552
66,854
713.40
26,744
69,519
713.50
26,936
72,203
713.60
27,128
74,906
713.70
27,320
77,628
713.80
27,513
80,370
713.90
27,705
83,131
714.00
27,897
85,911
714.10
28,095
88,711
714.20
28,293
91,530
714.30
28,492
94,369
714.40
28,690
97,228
714.50
28,888
100,107
714.60
29,086
103,006
714.70
29,284
105,924
714.80
29,483
108,863
714.90
29,681
111,821
715.00
29,879
114,799
715.10
30,083
117,797
715.20
30,287
120,816
715.30
30,491
123,855
715.40
30,695
126,914
715.50
30,900
129,994
715.60
31,104
133,094
715.70
31,308
136,214
715.80
31,512
139,355
715.90
31,716
142,517
716.00
31,920
145,699
716.10
32,130
148,901
716.20
32,340
152,125
716.30
32,550
155,369
716.40
32,760
158,635
716.50
32,971
161,921
716.60
33,181
165,229
716.70
33,391
168,557
716.80
33,601
171,907
716.90
33,811
175,277
717.00
34.021
178.669
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
717.10
34,237
182,082
717.20
34,453
185,516
717.30
34,670
188,973
717.40
34,886
192,450
717.50
35,102
195,950
717.60
35,318
199,471
717.70
35,534
203,013
717.80
35,751
206,578
717.90
35,967
210,164
718.00
36,183
213,771
718.10
36,405
217,400
718.20
36,627
221,052
718.30
36,849
224,726
718.40
37,071
228,422
718.50
37,294
232,140
718.60
37,516
235,881
718.70
37,738
239,643
718.80
37,960
243,428
718.90
38,182
247,235
719.00
38,404
251,065
719.10
38,632
254,916
719.20
38,860
258,791
719.30
39,089
262,688
719.40
39,317
266,609
719.50
39,545
270,552
719.60
39,773
274,518
719.70
40,001
278,506
719.80
40,230
282,518
719.90
40,458
286,552
720.00
40,686
290,610
Type 1124-hr 1 " WQ Rainfall= 1. 00 "
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1"WQ Rainfall= 1. 00 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 0.25" for 1" WQ event
Inflow = 6.65 cfs @ 11.97 hrs, Volume= 0.322 of
Outflow = 0.17 cfs @ 17.03 hrs, Volume= 0.309 af, Atten= 97%, Lag= 303.7 min
Primary = 0.17 cfs @ 17.03 hrs, Volume= 0.309 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 701.79' @ 17.03 hrs Surf.Area= 34,713 sf Storage= 8,256 cf
Plug -Flow detention time= 928.7 min calculated for 0.309 of (96% of inflow)
Center -of -Mass det. time= 906.6 min ( 1,779.6 - 873.1 )
Volume
Invert Avail.Storage Storage Description
#1
701.50'
519,480 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.50
22,118
0
0
702.00
43,792
16,478
16,478
703.00
48,320
46,056
62,534
704.00
52,961
50,641
113,174
705.00
57,717
55,339
168,513
706.00
62,582
60,150
228,663
707.00
67,552
65,067
293,730
708.00
72,628
70,090
363,820
709.00
77,809
75,219
439,038
710.00
83,074
80,442
519,480
Device Routing Invert Outlet Devices
#1 Primary 701.39' 24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1 701.50' 4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1 705.00' 36.0" W x 6.0" H Vert. Slotted Weirs X 2.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=0.17 cfs @ 17.03 hrs HW=701.79' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 0.17 cfs of 0.77 cfs potential flow)
2=4.5" Orifice (Orifice Controls 0.17 cfs @ 1.84 fps)
3=Slotted Weirs ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.50' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr I" WQ Rainfall=1.00"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 11
'0 iLM A1•R11111 3
.....
• 1 •
• •
i/
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//////////%///////////////////////////////111.-1
1 11 0ZrI

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.50
0.00
0.00
0.00
2.50
0.00
0
701.50
0.00
0.00
0.00
5.00
0.00
0
701.50
0.00
0.00
0.00
7.50
0.00
0
701.50
0.00
0.00
0.00
10.00
0.00
0
701.50
0.00
0.00
0.00
12.50
0.70
6,122
701.73
0.11
0.11
0.00
15.00
0.24
8,050
701.78
0.16
0.16
0.00
17.50
0.16
8,249
701.79
0.17
0.17
0.00
20.00
0.11
7,988
701.78
0.16
0.16
0.00
22.50
0.10
7,547
701.77
0.15
0.15
0.00
25.00
0.00
6,824
701.75
0.13
0.13
0.00
27.50
0.00
5,770
701.72
0.10
0.10
0.00
30.00
0.00
4,938
701.69
0.08
0.08
0.00
32.50
0.00
4,276
701.67
0.07
0.07
0.00
35.00
0.00
3,745
701.65
0.05
0.05
0.00
37.50
0.00
3,314
701.63
0.04
0.04
0.00
40.00
0.00
2,959
701.62
0.04
0.04
0.00
42.50
0.00
2,664
701.61
0.03
0.03
0.00
45.00
0.00
2,417
701.60
0.03
0.03
0.00
47.50
0.00
2,207
701.59
0.02
0.02
0.00
50.00
0.00
2,028
701.58
0.02
0.02
0.00
52.50
0.00
1,872
701.58
0.02
0.02
0.00
55.00
0.00
1,737
701.57
0.01
0.01
0.00
57.50
0.00
1,619
701.57
0.01
0.01
0.00
60.00
0.00
1,515
701.56
0.01
0.01
0.00
62.50
0.00
1,422
701.56
0.01
0.01
0.00
65.00
0.00
1,339
701.56
0.01
0.01
0.00
67.50
0.00
1,265
701.55
0.01
0.01
0.00
70.00
0.00
1,198
701.55
0.01
0.01
0.00
72.50
0.00
1,137
701.55
0.01
0.01
0.00
75.00
0.00
1,082
701.55
0.01
0.01
0.00
77.50
0.00
1,032
701.54
0.01
0.01
0.00
80.00
0.00
985
701.54
0.00
0.00
0.00
82.50
0.00
943
701.54
0.00
0.00
0.00
85.00
0.00
904
701.54
0.00
0.00
0.00
87.50
0.00
868
701.54
0.00
0.00
0.00
90.00
0.00
835
701.54
0.00
0.00
0.00
92.50
0.00
803
701.54
0.00
0.00
0.00
95.00
0.00
775
701.53
0.00
0.00
0.00
97.50
0.00
748
701.53
0.00
0.00
0.00
100.00
0.00
722
701.53
0.00
0.00
0.00
102.50
0.00
699
701.53
0.00
0.00
0.00
105.00
0.00
676
701.53
0.00
0.00
0.00
107.50
0.00
655
701.53
0.00
0.00
0.00
110.00
0.00
636
701.53
0.00
0.00
0.00
112.50
0.00
617
701.53
0.00
0.00
0.00
115.00
0.00
600
701.53
0.00
0.00
0.00
117.50
0.00
583
701.53
0.00
0.00
0.00
120.00
0.00
567
701.53
0.00
0.00
0.00
Type 1124-hr 1 " WQ Rainfall= 1. 00 "
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.50
0.00
0.00
0.00
701.60
0.03
0.03
0.00
701.70
0.09
0.09
0.00
701.80
0.18
0.18
0.00
701.90
0.25
0.25
0.00
702.00
0.30
0.30
0.00
702.10
0.34
0.34
0.00
702.20
0.38
0.38
0.00
702.30
0.42
0.42
0.00
702.40
0.45
0.45
0.00
702.50
0.48
0.48
0.00
702.60
0.51
0.51
0.00
702.70
0.54
0.54
0.00
702.80
0.56
0.56
0.00
702.90
0.59
0.59
0.00
703.00
0.61
0.61
0.00
703.10
0.63
0.63
0.00
703.20
0.65
0.65
0.00
703.30
0.68
0.68
0.00
703.40
0.70
0.70
0.00
703.50
0.72
0.72
0.00
703.60
0.74
0.74
0.00
703.70
0.75
0.75
0.00
703.80
0.77
0.77
0.00
703.90
0.79
0.79
0.00
704.00
0.81
0.81
0.00
704.10
0.83
0.83
0.00
704.20
0.84
0.84
0.00
704.30
0.86
0.86
0.00
704.40
0.88
0.88
0.00
704.50
0.89
0.89
0.00
704.60
0.91
0.91
0.00
704.70
0.92
0.92
0.00
704.80
0.94
0.94
0.00
704.90
0.95
0.95
0.00
705.00
0.97
0.97
0.00
705.10
1.59
1.59
0.00
705.20
2.72
2.72
0.00
705.30
4.18
4.18
0.00
705.40
5.90
5.90
0.00
705.50
7.85
7.85
0.00
705.60
9.39
9.39
0.00
705.70
10.62
10.62
0.00
705.80
11.69
11.69
0.00
705.90
12.66
12.66
0.00
706.00
13.55
13.55
0.00
706.10
14.39
14.39
0.00
706.20
15.17
15.17
0.00
706.30
15.91
15.91
0.00
706.40
16.61
16.61
0.00
706.50
17.29
17.29
0.00
706.60
17.94
17.94
0.00
706.70
18.56
18.56
0.00
706.80
19.17
19.17
0.00
706.90
19.75
19.75
0.00
707.00
20.32
20.32
0.00
707.10
20.87
20.87
0.00
707.20
21.41
21.41
0.00
707.30
21.93
21.93
0.00
707.40
22.44
22.44
0.00
707.50
22.94
22.94
0.00
707.60
23.43
23.43
0.00
707.70
23.90
23.90
0.00
707.80
24.37
24.37
0.00
707.90
24.83
24.83
0.00
708.00
25.28
25.28
0.00
Type 1124-hr 1 " WQ Rainfall= 1. 00 "
Printed 1/17/2023
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.10
27.38
27.38
0.00
708.20
30.84
30.84
0.00
708.30
35.18
35.18
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.50
22,118
0
701.60
26,453
2,429
701.70
30,788
5,291
701.80
35,122
8,586
701.90
39,457
12,315
702.00
43,792
16,478
702.10
44,245
20,879
702.20
44,698
25,326
702.30
45,150
29,819
702.40
45,603
34,357
702.50
46,056
38,940
702.60
46,509
43,568
702.70
46,962
48,241
702.80
47,414
52,960
702.90
47,867
57,724
703.00
48,320
62,534
703.10
48,784
67,389
703.20
49,248
72,290
703.30
49,712
77,238
703.40
50,176
82,233
703.50
50,641
87,274
703.60
51,105
92,361
703.70
51,569
97,495
703.80
52,033
102,675
703.90
52,497
107,901
704.00
52,961
113,174
704.10
53,437
118,494
704.20
53,912
123,861
704.30
54,388
129,276
704.40
54,863
134,739
704.50
55,339
140,249
704.60
55,815
145,807
704.70
56,290
151,412
704.80
56,766
157,065
704.90
57,241
162,765
705.00
57,717
168,513
705.10
58,204
174,309
705.20
58,690
180,154
705.30
59,176
186,047
705.40
59,663
191,989
705.50
60,150
197,980
705.60
60,636
204,019
705.70
61,123
210,107
705.80
61,609
216,243
705.90
62,095
222,429
706.00
62,582
228,663
706.10
63,079
234,946
706.20
63,576
241,278
706.30
64,073
247,661
706.40
64,570
254,093
706.50
65,067
260,575
706.60
65,564
267,106
706.70
66,061
273,688
706.80
66,558
280,318
706.90
67,055
286,999
707.00
67,552
293,730
707.10
68,060
300,510
707.20
68,567
307,341
707.30
69,075
314,224
707.40
69,582
321,156
707.50
70,090
328,140
707.60
70,598
335,174
707.70
71,105
342,260
707.80
71,613
349,395
707.90
72,120
356,582
708.00
72.628
363.820
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.10
73,146
371,108
708.20
73,664
378,449
708.30
74,182
385,841
708.40
74,700
393,285
708.50
75,219
400,781
708.60
75,737
408,329
708.70
76,255
415,928
708.80
76,773
423,580
708.90
77,291
431,283
709.00
77,809
439,038
709.10
78,336
446,845
709.20
78,862
454,705
709.30
79,388
462,618
709.40
79,915
470,583
709.50
80,442
478,601
709.60
80,968
486,671
709.70
81,495
494,794
709.80
82,021
502,970
709.90
82,547
511,198
710.00
83,074
519,480
Type 1124-hr 1 " WQ Rainfall= 1. 00 "
Printed 1/17/2023

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
1-YEAR, 24-HOUR STORM EVENT

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Summary for Subcatchment 3S: POST TO POND 2
Runoff = 58.05 cfs @ 11.96 hrs, Volume= 2.722 af, Depth= 1.65"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN
Description
14.690 98
Impervious
5.100 61
>75% Grass cover, Good, HSG B
19.790 88
Weighted Average
5.100
25.77% Pervious Area
14.690
74.23% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 3S: POST TO POND 2
Hydrograph
65
-I T--r F
■ Runoff
60
58.05 cfs �--T--r--�-----I---I--�--�--�--T--r--I�--I---I--�-----I--
--I------7--7--7--7-----I---I--7--7--7--T--7--7-----IITj�1 HT24
55
I
-- -- T--T- ---''I---'I----7--7-1�yrr2
50hr-RainfItT2.1'F-
--I-- 7--r- ---Ruhoff Aroa=19.790 arc -
45
----
40 I I I Rp n Offl Vp 1 i m�Ie=2. 2 �f
-- ---- -- - - ---I-- 7 -- --------
35 Runoff I'IDupthT1.�55�"
-
---
E 30' ' ' Tc"5.0 M i n
--I--I ,-7-7-�-� --II- - �-�-�-7-7-�-I---I- �-7-7-7-F
25
--
I I I I I I I I I I I I I I I I
I I
20
15
---- ---
10
--7- 7-- 7--i --i --7-------7-- 7-- 7--i --i --7-------7-- 7-- 7--i --i - -
5-/
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Hydrograph for Subcatchment 3S: POST TO POND 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.10
9.00
0.41
0.01
0.30
10.00
0.51
0.03
0.58
11.00
0.66
0.09
1.48
12.00
1.86
0.86
50.22
13.00
2.17
1.10
3.00
14.00
2.30
1.22
1.81
15.00
2.40
1.29
1.45
16.00
2.47
1.36
1.13
17.00
2.53
1.41
1.00
18.00
2.59
1.46
0.88
19.00
2.64
1.50
0.76
20.00
2.68
1.53
0.64
21.00
2.71
1.56
0.61
22.00
2.75
1.59
0.59
23.00
2.78
1.62
0.57
24.00
2.81
1.65
0.54
25.00
2.81
1.65
0.00
26.00
2.81
1.65
0.00
27.00
2.81
1.65
0.00
28.00
2.81
1.65
0.00
29.00
2.81
1.65
0.00
30.00
2.81
1.65
0.00
31.00
2.81
1.65
0.00
32.00
2.81
1.65
0.00
33.00
2.81
1.65
0.00
34.00
2.81
1.65
0.00
35.00
2.81
1.65
0.00
36.00
2.81
1.65
0.00
37.00
2.81
1.65
0.00
38.00
2.81
1.65
0.00
39.00
2.81
1.65
0.00
40.00
2.81
1.65
0.00
41.00
2.81
1.65
0.00
42.00
2.81
1.65
0.00
43.00
2.81
1.65
0.00
44.00
2.81
1.65
0.00
45.00
2.81
1.65
0.00
46.00
2.81
1.65
0.00
47.00
2.81
1.65
0.00
48.00
2.81
1.65
0.00
49.00
2.81
1.65
0.00
50.00
2.81
1.65
0.00
51.00
2.81
1.65
0.00
52.00
2.81
1.65
0.00
53.00
2.81
1.65
0.00
54.00
2.81
1.65
0.00
55.00
2.81
1.65
0.00
56.00
2.81
1.65
0.00
57.00
2.81
1.65
0.00
58.00
2.81
1.65
0.00
59.00
2.81
1.65
0.00
60.00
2.81
1.65
0.00
61.00
2.81
1.65
0.00
62.00
2.81
1.65
0.00
63.00
2.81
1.65
0.00
64.00
2.81
1.65
0.00
65.00
2.81
1.65
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.65
0.00
67.00
2.81
1.65
0.00
68.00
2.81
1.65
0.00
69.00
2.81
1.65
0.00
70.00
2.81
1.65
0.00
71.00
2.81
1.65
0.00
72.00
2.81
1.65
0.00
73.00
2.81
1.65
0.00
74.00
2.81
1.65
0.00
75.00
2.81
1.65
0.00
76.00
2.81
1.65
0.00
77.00
2.81
1.65
0.00
78.00
2.81
1.65
0.00
79.00
2.81
1.65
0.00
80.00
2.81
1.65
0.00
81.00
2.81
1.65
0.00
82.00
2.81
1.65
0.00
83.00
2.81
1.65
0.00
84.00
2.81
1.65
0.00
85.00
2.81
1.65
0.00
86.00
2.81
1.65
0.00
87.00
2.81
1.65
0.00
88.00
2.81
1.65
0.00
89.00
2.81
1.65
0.00
90.00
2.81
1.65
0.00
91.00
2.81
1.65
0.00
92.00
2.81
1.65
0.00
93.00
2.81
1.65
0.00
94.00
2.81
1.65
0.00
95.00
2.81
1.65
0.00
96.00
2.81
1.65
0.00
97.00
2.81
1.65
0.00
98.00
2.81
1.65
0.00
99.00
2.81
1.65
0.00
100.00
2.81
1.65
0.00
101.00
2.81
1.65
0.00
102.00
2.81
1.65
0.00
103.00
2.81
1.65
0.00
104.00
2.81
1.65
0.00
105.00
2.81
1.65
0.00
106.00
2.81
1.65
0.00
107.00
2.81
1.65
0.00
108.00
2.81
1.65
0.00
109.00
2.81
1.65
0.00
110.00
2.81
1.65
0.00
111.00
2.81
1.65
0.00
112.00
2.81
1.65
0.00
113.00
2.81
1.65
0.00
114.00
2.81
1.65
0.00
115.00
2.81
1.65
0.00
116.00
2.81
1.65
0.00
117.00
2.81
1.65
0.00
118.00
2.81
1.65
0.00
119.00
2.81
1.65
0.00
120.00
2.81
1.65
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 3
Summary for Subcatchment 4S: PRE (OUTFALL #1)
Runoff = 30.23 cfs @ 12.17 hrs, Volume= 2.670 af, Depth= 0.74"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
9.130 55 Woods, Good, HSG B
34.000 78 Row crops, straight row, Good, HSG B
43.130 73 Weighted Average
43.130 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 4S: PRE (OUTFALL #1)
Hydrograph
----------y--T--r--r--Ir-------y--rt--rt--+--r--Ir--Ir----y---
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Hydrograph for Subcatchment 4S: PRE (OUTFALL #1)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.26
14.20
13.00
2.17
0.40
4.77
14.00
2.30
0.47
2.68
15.00
2.40
0.51
2.05
16.00
2.47
0.55
1.65
17.00
2.53
0.59
1.42
18.00
2.59
0.62
1.27
19.00
2.64
0.64
1.12
20.00
2.68
0.66
0.96
21.00
2.71
0.69
0.89
22.00
2.75
0.71
0.86
23.00
2.78
0.72
0.83
24.00
2.81
0.74
0.80
25.00
2.81
0.74
0.00
26.00
2.81
0.74
0.00
27.00
2.81
0.74
0.00
28.00
2.81
0.74
0.00
29.00
2.81
0.74
0.00
30.00
2.81
0.74
0.00
31.00
2.81
0.74
0.00
32.00
2.81
0.74
0.00
33.00
2.81
0.74
0.00
34.00
2.81
0.74
0.00
35.00
2.81
0.74
0.00
36.00
2.81
0.74
0.00
37.00
2.81
0.74
0.00
38.00
2.81
0.74
0.00
39.00
2.81
0.74
0.00
40.00
2.81
0.74
0.00
41.00
2.81
0.74
0.00
42.00
2.81
0.74
0.00
43.00
2.81
0.74
0.00
44.00
2.81
0.74
0.00
45.00
2.81
0.74
0.00
46.00
2.81
0.74
0.00
47.00
2.81
0.74
0.00
48.00
2.81
0.74
0.00
49.00
2.81
0.74
0.00
50.00
2.81
0.74
0.00
51.00
2.81
0.74
0.00
52.00
2.81
0.74
0.00
53.00
2.81
0.74
0.00
54.00
2.81
0.74
0.00
55.00
2.81
0.74
0.00
56.00
2.81
0.74
0.00
57.00
2.81
0.74
0.00
58.00
2.81
0.74
0.00
59.00
2.81
0.74
0.00
60.00
2.81
0.74
0.00
61.00
2.81
0.74
0.00
62.00
2.81
0.74
0.00
63.00
2.81
0.74
0.00
64.00
2.81
0.74
0.00
65.00
2.81
0.74
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.74
0.00
67.00
2.81
0.74
0.00
68.00
2.81
0.74
0.00
69.00
2.81
0.74
0.00
70.00
2.81
0.74
0.00
71.00
2.81
0.74
0.00
72.00
2.81
0.74
0.00
73.00
2.81
0.74
0.00
74.00
2.81
0.74
0.00
75.00
2.81
0.74
0.00
76.00
2.81
0.74
0.00
77.00
2.81
0.74
0.00
78.00
2.81
0.74
0.00
79.00
2.81
0.74
0.00
80.00
2.81
0.74
0.00
81.00
2.81
0.74
0.00
82.00
2.81
0.74
0.00
83.00
2.81
0.74
0.00
84.00
2.81
0.74
0.00
85.00
2.81
0.74
0.00
86.00
2.81
0.74
0.00
87.00
2.81
0.74
0.00
88.00
2.81
0.74
0.00
89.00
2.81
0.74
0.00
90.00
2.81
0.74
0.00
91.00
2.81
0.74
0.00
92.00
2.81
0.74
0.00
93.00
2.81
0.74
0.00
94.00
2.81
0.74
0.00
95.00
2.81
0.74
0.00
96.00
2.81
0.74
0.00
97.00
2.81
0.74
0.00
98.00
2.81
0.74
0.00
99.00
2.81
0.74
0.00
100.00
2.81
0.74
0.00
101.00
2.81
0.74
0.00
102.00
2.81
0.74
0.00
103.00
2.81
0.74
0.00
104.00
2.81
0.74
0.00
105.00
2.81
0.74
0.00
106.00
2.81
0.74
0.00
107.00
2.81
0.74
0.00
108.00
2.81
0.74
0.00
109.00
2.81
0.74
0.00
110.00
2.81
0.74
0.00
111.00
2.81
0.74
0.00
112.00
2.81
0.74
0.00
113.00
2.81
0.74
0.00
114.00
2.81
0.74
0.00
115.00
2.81
0.74
0.00
116.00
2.81
0.74
0.00
117.00
2.81
0.74
0.00
118.00
2.81
0.74
0.00
119.00
2.81
0.74
0.00
120.00
2.81
0.74
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Summary for Subcatchment 5S: PRE (OUTFALL #2)
Runoff = 43.88 cfs @ 12.17 hrs, Volume= 3.809 af, Depth= 0.79"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
10.200 55 Woods, Good, HSG B
47.660 78 Row crops, straight row, Good, HSG B
57.860 74 Weighted Average
57.860 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 5S: PRE (OUTFALL #2)
Hydrograph
48
46
--L--L--
cfs T--T--T--T----------T--T--T--T--T--T-----Tn-p--T--T---j'rr--
--1---1---1--J--1--L--
--L--L-------L----L--L--L--
■Runoff
43.88
44
----'---'
--'
--'
--'--------'---'
---'
--' --' --'-----T�i
J-I -"r'--
----
--+-
42
38-
+--+--+--+--r--r-------+--+--+--+--r--+--+-ppl�
P'"I
7_8 11
i
36
34
--�--
--'--
-----
-'----L--L--
T-
- r-
- r--+-------
--1---1---1--J--1--L-
--
--
*ice
-Ru�aoffAr6&67-860ad,
30
----
---y--t--t--
r----------y-
-I-
-yam'# Y r��1�fi"fg=�'910 of
w28
26
----
--- --+--
--
-----;
----------
-----------
--
--
-- -- -- - -- -- - +-- -- --
Run6 'D�pt a 79"-
1
I
FlbvV-L-d"#h='1-,'�62'--
18
--i-
---T--T--T--T----------T--T--T--T--T--+-----'Tr,==
1-.I
16
14
--,-
--'-
-,--;--;--,---,---,---,---,---,--;--------------------------------
-'-- --
--
--
--------'--
--
--
-- -- -------'-- -- -��� -
12
10
---
--'-
-----T--T--T--
-'----L--L--L--1---1---1--J--1--L--L--L--L-------L--
-------
---T
-T
T --T ----------- T--T--r --F --
--L--L--L--
8
6
-i- -
-----7--r--r--r--r----------r--r--r-------7----7--r--r--
4
-----T----------------+-----------+--+--�--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Hydrograph for Subcatchment 5S: PRE (OUTFALL #2)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.29
21.41
13.00
2.17
0.43
6.72
14.00
2.30
0.50
3.75
15.00
2.40
0.55
2.86
16.00
2.47
0.59
2.30
17.00
2.53
0.63
1.98
18.00
2.59
0.66
1.77
19.00
2.64
0.69
1.56
20.00
2.68
0.71
1.33
21.00
2.71
0.73
1.23
22.00
2.75
0.75
1.19
23.00
2.78
0.77
1.15
24.00
2.81
0.79
1.11
25.00
2.81
0.79
0.00
26.00
2.81
0.79
0.00
27.00
2.81
0.79
0.00
28.00
2.81
0.79
0.00
29.00
2.81
0.79
0.00
30.00
2.81
0.79
0.00
31.00
2.81
0.79
0.00
32.00
2.81
0.79
0.00
33.00
2.81
0.79
0.00
34.00
2.81
0.79
0.00
35.00
2.81
0.79
0.00
36.00
2.81
0.79
0.00
37.00
2.81
0.79
0.00
38.00
2.81
0.79
0.00
39.00
2.81
0.79
0.00
40.00
2.81
0.79
0.00
41.00
2.81
0.79
0.00
42.00
2.81
0.79
0.00
43.00
2.81
0.79
0.00
44.00
2.81
0.79
0.00
45.00
2.81
0.79
0.00
46.00
2.81
0.79
0.00
47.00
2.81
0.79
0.00
48.00
2.81
0.79
0.00
49.00
2.81
0.79
0.00
50.00
2.81
0.79
0.00
51.00
2.81
0.79
0.00
52.00
2.81
0.79
0.00
53.00
2.81
0.79
0.00
54.00
2.81
0.79
0.00
55.00
2.81
0.79
0.00
56.00
2.81
0.79
0.00
57.00
2.81
0.79
0.00
58.00
2.81
0.79
0.00
59.00
2.81
0.79
0.00
60.00
2.81
0.79
0.00
61.00
2.81
0.79
0.00
62.00
2.81
0.79
0.00
63.00
2.81
0.79
0.00
64.00
2.81
0.79
0.00
65.00
2.81
0.79
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.79
0.00
67.00
2.81
0.79
0.00
68.00
2.81
0.79
0.00
69.00
2.81
0.79
0.00
70.00
2.81
0.79
0.00
71.00
2.81
0.79
0.00
72.00
2.81
0.79
0.00
73.00
2.81
0.79
0.00
74.00
2.81
0.79
0.00
75.00
2.81
0.79
0.00
76.00
2.81
0.79
0.00
77.00
2.81
0.79
0.00
78.00
2.81
0.79
0.00
79.00
2.81
0.79
0.00
80.00
2.81
0.79
0.00
81.00
2.81
0.79
0.00
82.00
2.81
0.79
0.00
83.00
2.81
0.79
0.00
84.00
2.81
0.79
0.00
85.00
2.81
0.79
0.00
86.00
2.81
0.79
0.00
87.00
2.81
0.79
0.00
88.00
2.81
0.79
0.00
89.00
2.81
0.79
0.00
90.00
2.81
0.79
0.00
91.00
2.81
0.79
0.00
92.00
2.81
0.79
0.00
93.00
2.81
0.79
0.00
94.00
2.81
0.79
0.00
95.00
2.81
0.79
0.00
96.00
2.81
0.79
0.00
97.00
2.81
0.79
0.00
98.00
2.81
0.79
0.00
99.00
2.81
0.79
0.00
100.00
2.81
0.79
0.00
101.00
2.81
0.79
0.00
102.00
2.81
0.79
0.00
103.00
2.81
0.79
0.00
104.00
2.81
0.79
0.00
105.00
2.81
0.79
0.00
106.00
2.81
0.79
0.00
107.00
2.81
0.79
0.00
108.00
2.81
0.79
0.00
109.00
2.81
0.79
0.00
110.00
2.81
0.79
0.00
111.00
2.81
0.79
0.00
112.00
2.81
0.79
0.00
113.00
2.81
0.79
0.00
114.00
2.81
0.79
0.00
115.00
2.81
0.79
0.00
116.00
2.81
0.79
0.00
117.00
2.81
0.79
0.00
118.00
2.81
0.79
0.00
119.00
2.81
0.79
0.00
120.00
2.81
0.79
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 7
Summary for Subcatchment 6S: PRE (OUTFALL #3)
Runoff = 10.46 cfs @ 12.17 hrs, Volume= 0.924 af, Depth= 0.74"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
3.190 55 Woods, Good, HSG B
11.740 78 Row crops, straight row, Good, HSG B
14.930 73 Weighted Average
14.930 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 6S: PRE (OUTFALL #3)
Hydrograph
----------�--+--+--�--�---�---�--�--�--�--+--�--�--�---�--�--�--+--+--�-- ■Runoff
11 10.46 Cfs
--------------------------------------------
10 I YpQ- - _ hl
Ir -
-- - T--r- - ---1yrrUhr-RainfalrT2.81�F-
-- --- -- --; --; --, -
------I- - 4 --4 -Runoff Ard&14.930 at -
7
1 i np f-VQIO*e=0: 4 � -
w--',-- -'I-- -- -- --', --'I--'I---'1---', -- -- -- -- - - rt +F -
6 Runoff Depth4r74
LL -- -- -- --' ----------Ftbw!-tdn-0th--1-,462U-
s
3
2
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 8
Hydrograph for Subcatchment 6S: PRE (OUTFALL #3)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.26
4.91
13.00
2.17
0.40
1.65
14.00
2.30
0.47
0.93
15.00
2.40
0.51
0.71
16.00
2.47
0.55
0.57
17.00
2.53
0.59
0.49
18.00
2.59
0.62
0.44
19.00
2.64
0.64
0.39
20.00
2.68
0.66
0.33
21.00
2.71
0.69
0.31
22.00
2.75
0.71
0.30
23.00
2.78
0.72
0.29
24.00
2.81
0.74
0.28
25.00
2.81
0.74
0.00
26.00
2.81
0.74
0.00
27.00
2.81
0.74
0.00
28.00
2.81
0.74
0.00
29.00
2.81
0.74
0.00
30.00
2.81
0.74
0.00
31.00
2.81
0.74
0.00
32.00
2.81
0.74
0.00
33.00
2.81
0.74
0.00
34.00
2.81
0.74
0.00
35.00
2.81
0.74
0.00
36.00
2.81
0.74
0.00
37.00
2.81
0.74
0.00
38.00
2.81
0.74
0.00
39.00
2.81
0.74
0.00
40.00
2.81
0.74
0.00
41.00
2.81
0.74
0.00
42.00
2.81
0.74
0.00
43.00
2.81
0.74
0.00
44.00
2.81
0.74
0.00
45.00
2.81
0.74
0.00
46.00
2.81
0.74
0.00
47.00
2.81
0.74
0.00
48.00
2.81
0.74
0.00
49.00
2.81
0.74
0.00
50.00
2.81
0.74
0.00
51.00
2.81
0.74
0.00
52.00
2.81
0.74
0.00
53.00
2.81
0.74
0.00
54.00
2.81
0.74
0.00
55.00
2.81
0.74
0.00
56.00
2.81
0.74
0.00
57.00
2.81
0.74
0.00
58.00
2.81
0.74
0.00
59.00
2.81
0.74
0.00
60.00
2.81
0.74
0.00
61.00
2.81
0.74
0.00
62.00
2.81
0.74
0.00
63.00
2.81
0.74
0.00
64.00
2.81
0.74
0.00
65.00
2.81
0.74
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.74
0.00
67.00
2.81
0.74
0.00
68.00
2.81
0.74
0.00
69.00
2.81
0.74
0.00
70.00
2.81
0.74
0.00
71.00
2.81
0.74
0.00
72.00
2.81
0.74
0.00
73.00
2.81
0.74
0.00
74.00
2.81
0.74
0.00
75.00
2.81
0.74
0.00
76.00
2.81
0.74
0.00
77.00
2.81
0.74
0.00
78.00
2.81
0.74
0.00
79.00
2.81
0.74
0.00
80.00
2.81
0.74
0.00
81.00
2.81
0.74
0.00
82.00
2.81
0.74
0.00
83.00
2.81
0.74
0.00
84.00
2.81
0.74
0.00
85.00
2.81
0.74
0.00
86.00
2.81
0.74
0.00
87.00
2.81
0.74
0.00
88.00
2.81
0.74
0.00
89.00
2.81
0.74
0.00
90.00
2.81
0.74
0.00
91.00
2.81
0.74
0.00
92.00
2.81
0.74
0.00
93.00
2.81
0.74
0.00
94.00
2.81
0.74
0.00
95.00
2.81
0.74
0.00
96.00
2.81
0.74
0.00
97.00
2.81
0.74
0.00
98.00
2.81
0.74
0.00
99.00
2.81
0.74
0.00
100.00
2.81
0.74
0.00
101.00
2.81
0.74
0.00
102.00
2.81
0.74
0.00
103.00
2.81
0.74
0.00
104.00
2.81
0.74
0.00
105.00
2.81
0.74
0.00
106.00
2.81
0.74
0.00
107.00
2.81
0.74
0.00
108.00
2.81
0.74
0.00
109.00
2.81
0.74
0.00
110.00
2.81
0.74
0.00
111.00
2.81
0.74
0.00
112.00
2.81
0.74
0.00
113.00
2.81
0.74
0.00
114.00
2.81
0.74
0.00
115.00
2.81
0.74
0.00
116.00
2.81
0.74
0.00
117.00
2.81
0.74
0.00
118.00
2.81
0.74
0.00
119.00
2.81
0.74
0.00
120.00
2.81
0.74
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 9
Summary for Subcatchment 7S: POST TO POND 3
Runoff = 44.76 cfs @ 11.96 hrs, Volume= 2.099 af, Depth= 1.65"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN
Description
11.010 98
Impervious
4.250 61
>75% Grass cover, Good, HSG B
15.260 88
Weighted Average
4.250
27.85% Pervious Area
11.010
72.15% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 7S: POST TO POND 3
Hydrograph
44.76cfs T--�--�--�-----I---I--�--�--�--�--r--��--I---I--�--�--�--r--��--
■ Runoff
4b----------i
44
----
----+--+--+--+----------+--+--+--+--+--+-----
--
-------
--
----- - -- -i-------_- - -- - -- -----
TylN124-h'--
" M
42
40
j
--;--
--'--
--;--T--T--;---;---;---;---;--T--T--T-----------------I����-��-�-,,..�I��-----=--
------1--L--r--------------�-�1
1
rT��Ra11111Q�IT�.�ln
38
36
r
--'--
1--r--r--r--r--r--1--
-----1
L
L--
--1---1---1--J--1--L-Runoff
1--r--7--r--
-r--r--1---1- r--r--r--r--r--
T
Aftatl5.260-at -
34
j
--I--
----r--r--r--r--------1--r--
7--
-
7-- r-- r-- r--1--- I-- 7-- 7-- T-- r-- r32
11 Y LJ�
30
--1--
--1--+--+--+--+--1---1---1--+--+--+
28
26
--;--
----
--;--1--1--------;---;---;-----1--1-----l�iraQfl�e�p��5;,r_
----+--+--+--+----------+--+--+--+--
0 24
iL 22
----
---- 1--
1--;---;---;-----------?--?--------------;--
+--L--r--I
- - --
-r--------- c:i :510-ftlih--
20
18
----
--'--
---- T--
--'----1--L--r--1---1---1--J--1--1--
1
T --T
--
---------
1
--
--
--r--T--T------- -- -- N
--L---------J--1- -
1 1
16
--1--
--1--,--r--r--r--1---
r--r--r--r--1--7--7--r--r--r--
14
12
--'--
--r-
--'--L--1--L--L--1---1---1--J--1--L--L--L--+-------J--L--1--L--
-1--r--r--r--r--r--1---1--r--r--r--r--r--r--r--1--r--r--r--r--r--
--
$
--1----1--+--+--r--r--1---1--------+--r--+--1---1----
--T--r--+--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Hydrograph for Subcatchment 7S: POST TO POND 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.08
9.00
0.41
0.01
0.23
10.00
0.51
0.03
0.44
11.00
0.66
0.09
1.14
12.00
1.86
0.86
38.73
13.00
2.17
1.10
2.32
14.00
2.30
1.22
1.40
15.00
2.40
1.29
1.12
16.00
2.47
1.36
0.87
17.00
2.53
1.41
0.77
18.00
2.59
1.46
0.68
19.00
2.64
1.50
0.59
20.00
2.68
1.53
0.50
21.00
2.71
1.56
0.47
22.00
2.75
1.59
0.45
23.00
2.78
1.62
0.44
24.00
2.81
1.65
0.42
25.00
2.81
1.65
0.00
26.00
2.81
1.65
0.00
27.00
2.81
1.65
0.00
28.00
2.81
1.65
0.00
29.00
2.81
1.65
0.00
30.00
2.81
1.65
0.00
31.00
2.81
1.65
0.00
32.00
2.81
1.65
0.00
33.00
2.81
1.65
0.00
34.00
2.81
1.65
0.00
35.00
2.81
1.65
0.00
36.00
2.81
1.65
0.00
37.00
2.81
1.65
0.00
38.00
2.81
1.65
0.00
39.00
2.81
1.65
0.00
40.00
2.81
1.65
0.00
41.00
2.81
1.65
0.00
42.00
2.81
1.65
0.00
43.00
2.81
1.65
0.00
44.00
2.81
1.65
0.00
45.00
2.81
1.65
0.00
46.00
2.81
1.65
0.00
47.00
2.81
1.65
0.00
48.00
2.81
1.65
0.00
49.00
2.81
1.65
0.00
50.00
2.81
1.65
0.00
51.00
2.81
1.65
0.00
52.00
2.81
1.65
0.00
53.00
2.81
1.65
0.00
54.00
2.81
1.65
0.00
55.00
2.81
1.65
0.00
56.00
2.81
1.65
0.00
57.00
2.81
1.65
0.00
58.00
2.81
1.65
0.00
59.00
2.81
1.65
0.00
60.00
2.81
1.65
0.00
61.00
2.81
1.65
0.00
62.00
2.81
1.65
0.00
63.00
2.81
1.65
0.00
64.00
2.81
1.65
0.00
65.00
2.81
1.65
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.65
0.00
67.00
2.81
1.65
0.00
68.00
2.81
1.65
0.00
69.00
2.81
1.65
0.00
70.00
2.81
1.65
0.00
71.00
2.81
1.65
0.00
72.00
2.81
1.65
0.00
73.00
2.81
1.65
0.00
74.00
2.81
1.65
0.00
75.00
2.81
1.65
0.00
76.00
2.81
1.65
0.00
77.00
2.81
1.65
0.00
78.00
2.81
1.65
0.00
79.00
2.81
1.65
0.00
80.00
2.81
1.65
0.00
81.00
2.81
1.65
0.00
82.00
2.81
1.65
0.00
83.00
2.81
1.65
0.00
84.00
2.81
1.65
0.00
85.00
2.81
1.65
0.00
86.00
2.81
1.65
0.00
87.00
2.81
1.65
0.00
88.00
2.81
1.65
0.00
89.00
2.81
1.65
0.00
90.00
2.81
1.65
0.00
91.00
2.81
1.65
0.00
92.00
2.81
1.65
0.00
93.00
2.81
1.65
0.00
94.00
2.81
1.65
0.00
95.00
2.81
1.65
0.00
96.00
2.81
1.65
0.00
97.00
2.81
1.65
0.00
98.00
2.81
1.65
0.00
99.00
2.81
1.65
0.00
100.00
2.81
1.65
0.00
101.00
2.81
1.65
0.00
102.00
2.81
1.65
0.00
103.00
2.81
1.65
0.00
104.00
2.81
1.65
0.00
105.00
2.81
1.65
0.00
106.00
2.81
1.65
0.00
107.00
2.81
1.65
0.00
108.00
2.81
1.65
0.00
109.00
2.81
1.65
0.00
110.00
2.81
1.65
0.00
111.00
2.81
1.65
0.00
112.00
2.81
1.65
0.00
113.00
2.81
1.65
0.00
114.00
2.81
1.65
0.00
115.00
2.81
1.65
0.00
116.00
2.81
1.65
0.00
117.00
2.81
1.65
0.00
118.00
2.81
1.65
0.00
119.00
2.81
1.65
0.00
120.00
2.81
1.65
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 11
Summary for Subcatchment 9S: POST TO POND 4
Runoff = 29.66 cfs @ 11.96 hrs, Volume= 1.384 af, Depth= 1.57"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
7.330 98 Impervious
3.220 61 >75% Grass cover, Good, HSG B
10.550 87 Weighted Average
3.220 30.52% Pervious Area
7.330 69.48% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 9S: POST TO POND 4
Hydrograph
3229.66 CfS - -----------'I--- - -- -- -----------'I--- - -- --- ■Runoff
30
-I------+--+--+--r--r-------+--+--+--+--r--r--r--i• P e *24-hir -
28 --'-------1--L------'---'--------L---------------1--L--�--
26 - -'- -
-- - 'I_lyrrMr RainfaIIT2.,�8t
--r-
24 ------Y--r--r------------rt--rt-Runoff Ar6&40.-550-at -
22 ------1--L----1---1---1--J--1-- --1 1 I- '--1--
20 --I-- j1�i�npffl Vp1uirpe=1:go 0
I I I I I I I I I I I I I I I I I I I I I�� I
u 1g Runoff Qepth:0- 711 -
.- --I-- --I----+--+----------I-- -- -- --+-- j+ s
O16 --�--------1--L--L--1---1---1--J--1--1----L--L--1---�- y��=}^
14 I I I I I I I I I I I I I I I I I I I I I I
12
--r-----r--r--r--r--r-------r--r--r--r--r--r--r----r--r-- --r- r--
10 --'-- --'----1--L--L--1---1---1--J--1--1--L--L--+-------J--1--1--L-- --
8
6
j
4 --'-- -'----1--L--L--1---1---1--J--1--1--L--L--L--1---1--J----1--L--L--
2
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 12
Hydrograph for Subcatchment 9S: POST TO POND 4
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.03
9.00
0.41
0.01
0.12
10.00
0.51
0.03
0.26
11.00
0.66
0.07
0.70
12.00
1.86
0.80
25.76
13.00
2.17
1.04
1.56
14.00
2.30
1.15
0.94
15.00
2.40
1.23
0.75
16.00
2.47
1.29
0.59
17.00
2.53
1.34
0.52
18.00
2.59
1.39
0.46
19.00
2.64
1.42
0.40
20.00
2.68
1.46
0.34
21.00
2.71
1.49
0.32
22.00
2.75
1.52
0.31
23.00
2.78
1.55
0.30
24.00
2.81
1.57
0.28
25.00
2.81
1.57
0.00
26.00
2.81
1.57
0.00
27.00
2.81
1.57
0.00
28.00
2.81
1.57
0.00
29.00
2.81
1.57
0.00
30.00
2.81
1.57
0.00
31.00
2.81
1.57
0.00
32.00
2.81
1.57
0.00
33.00
2.81
1.57
0.00
34.00
2.81
1.57
0.00
35.00
2.81
1.57
0.00
36.00
2.81
1.57
0.00
37.00
2.81
1.57
0.00
38.00
2.81
1.57
0.00
39.00
2.81
1.57
0.00
40.00
2.81
1.57
0.00
41.00
2.81
1.57
0.00
42.00
2.81
1.57
0.00
43.00
2.81
1.57
0.00
44.00
2.81
1.57
0.00
45.00
2.81
1.57
0.00
46.00
2.81
1.57
0.00
47.00
2.81
1.57
0.00
48.00
2.81
1.57
0.00
49.00
2.81
1.57
0.00
50.00
2.81
1.57
0.00
51.00
2.81
1.57
0.00
52.00
2.81
1.57
0.00
53.00
2.81
1.57
0.00
54.00
2.81
1.57
0.00
55.00
2.81
1.57
0.00
56.00
2.81
1.57
0.00
57.00
2.81
1.57
0.00
58.00
2.81
1.57
0.00
59.00
2.81
1.57
0.00
60.00
2.81
1.57
0.00
61.00
2.81
1.57
0.00
62.00
2.81
1.57
0.00
63.00
2.81
1.57
0.00
64.00
2.81
1.57
0.00
65.00
2.81
1.57
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.57
0.00
67.00
2.81
1.57
0.00
68.00
2.81
1.57
0.00
69.00
2.81
1.57
0.00
70.00
2.81
1.57
0.00
71.00
2.81
1.57
0.00
72.00
2.81
1.57
0.00
73.00
2.81
1.57
0.00
74.00
2.81
1.57
0.00
75.00
2.81
1.57
0.00
76.00
2.81
1.57
0.00
77.00
2.81
1.57
0.00
78.00
2.81
1.57
0.00
79.00
2.81
1.57
0.00
80.00
2.81
1.57
0.00
81.00
2.81
1.57
0.00
82.00
2.81
1.57
0.00
83.00
2.81
1.57
0.00
84.00
2.81
1.57
0.00
85.00
2.81
1.57
0.00
86.00
2.81
1.57
0.00
87.00
2.81
1.57
0.00
88.00
2.81
1.57
0.00
89.00
2.81
1.57
0.00
90.00
2.81
1.57
0.00
91.00
2.81
1.57
0.00
92.00
2.81
1.57
0.00
93.00
2.81
1.57
0.00
94.00
2.81
1.57
0.00
95.00
2.81
1.57
0.00
96.00
2.81
1.57
0.00
97.00
2.81
1.57
0.00
98.00
2.81
1.57
0.00
99.00
2.81
1.57
0.00
100.00
2.81
1.57
0.00
101.00
2.81
1.57
0.00
102.00
2.81
1.57
0.00
103.00
2.81
1.57
0.00
104.00
2.81
1.57
0.00
105.00
2.81
1.57
0.00
106.00
2.81
1.57
0.00
107.00
2.81
1.57
0.00
108.00
2.81
1.57
0.00
109.00
2.81
1.57
0.00
110.00
2.81
1.57
0.00
111.00
2.81
1.57
0.00
112.00
2.81
1.57
0.00
113.00
2.81
1.57
0.00
114.00
2.81
1.57
0.00
115.00
2.81
1.57
0.00
116.00
2.81
1.57
0.00
117.00
2.81
1.57
0.00
118.00
2.81
1.57
0.00
119.00
2.81
1.57
0.00
120.00
2.81
1.57
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 13
Summary for Subcatchment 12S: POST TO POND 1
Runoff = 120.03 cfs @ 11.95 hrs, Volume= 5.743 af, Depth= 1.89"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN
Description
29.640 98
Impervious
6.730 61
>75% Grass cover, Good, HSG B
36.370 91
Weighted Average
6.730
18.50% Pervious Area
29.640
81.50% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 12S: POST TO POND 1
Hydrograph
--I---I--+--+--+-- --�----+----+--+--------I-- --+-- --------I-- --+-
130 1 1Runoff
120.03 cfs +--+--r--+--1--+--+--+--+--1---1---1--+--+--+--1---1---1--+-+..--
120 1 1 - Ty;1po-1 �;124-1 �
--r--r--T--r--r--r--1--r--r--r--r--r-A-1---1/-�-wry-.,r,-p�,��� M L=/4�
110 '1 I--11--I11--1r--Tr--1r--11---11--I11----r--1rolyrT 4ftrii1t:infed1Tt.181T,
100
r
-11--T----------T- -T -- Ru off AT-1de�3-6.-37-0 ad-
90
--I-- --I-- -- - ------I-- -- - -- gnO#fVQ14m11c=1115. 4 f-
80
w - R--o-ff Depth=TII .8W -
70
3 --1� - J--1--1--L--L--1--J--1--1--L--1---1---1--�--�--�- 1---1--1--1--1--
Tcy5.�0 tnih
LL 60 T
50
40
-I-- +--+--+--r--+--1--+--+--+--+--1---1---1--+--+--+--1---1---1--+--+--
30
--1- r--T--r--r--r----r--r--r--r----------r--r--r----------T--r--
20
--I-- -1 T--r--r--r--1--T--T--T--r--1------I--T--r--r-----1---1--7--T--
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 14
Hydrograph for Subcatchment 12S: POST TO POND 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.08
7.00
0.28
0.01
0.28
8.00
0.34
0.02
0.51
9.00
0.41
0.04
1.02
10.00
0.51
0.07
1.65
11.00
0.66
0.15
3.73
12.00
1.86
1.04
102.60
13.00
2.17
1.31
5.95
14.00
2.30
1.43
3.56
15.00
2.40
1.52
2.84
16.00
2.47
1.59
2.20
17.00
2.53
1.64
1.94
18.00
2.59
1.69
1.71
19.00
2.64
1.73
1.48
20.00
2.68
1.77
1.25
21.00
2.71
1.80
1.19
22.00
2.75
1.84
1.14
23.00
2.78
1.87
1.10
24.00
2.81
1.89
1.05
25.00
2.81
1.89
0.00
26.00
2.81
1.89
0.00
27.00
2.81
1.89
0.00
28.00
2.81
1.89
0.00
29.00
2.81
1.89
0.00
30.00
2.81
1.89
0.00
31.00
2.81
1.89
0.00
32.00
2.81
1.89
0.00
33.00
2.81
1.89
0.00
34.00
2.81
1.89
0.00
35.00
2.81
1.89
0.00
36.00
2.81
1.89
0.00
37.00
2.81
1.89
0.00
38.00
2.81
1.89
0.00
39.00
2.81
1.89
0.00
40.00
2.81
1.89
0.00
41.00
2.81
1.89
0.00
42.00
2.81
1.89
0.00
43.00
2.81
1.89
0.00
44.00
2.81
1.89
0.00
45.00
2.81
1.89
0.00
46.00
2.81
1.89
0.00
47.00
2.81
1.89
0.00
48.00
2.81
1.89
0.00
49.00
2.81
1.89
0.00
50.00
2.81
1.89
0.00
51.00
2.81
1.89
0.00
52.00
2.81
1.89
0.00
53.00
2.81
1.89
0.00
54.00
2.81
1.89
0.00
55.00
2.81
1.89
0.00
56.00
2.81
1.89
0.00
57.00
2.81
1.89
0.00
58.00
2.81
1.89
0.00
59.00
2.81
1.89
0.00
60.00
2.81
1.89
0.00
61.00
2.81
1.89
0.00
62.00
2.81
1.89
0.00
63.00
2.81
1.89
0.00
64.00
2.81
1.89
0.00
65.00
2.81
1.89
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.89
0.00
67.00
2.81
1.89
0.00
68.00
2.81
1.89
0.00
69.00
2.81
1.89
0.00
70.00
2.81
1.89
0.00
71.00
2.81
1.89
0.00
72.00
2.81
1.89
0.00
73.00
2.81
1.89
0.00
74.00
2.81
1.89
0.00
75.00
2.81
1.89
0.00
76.00
2.81
1.89
0.00
77.00
2.81
1.89
0.00
78.00
2.81
1.89
0.00
79.00
2.81
1.89
0.00
80.00
2.81
1.89
0.00
81.00
2.81
1.89
0.00
82.00
2.81
1.89
0.00
83.00
2.81
1.89
0.00
84.00
2.81
1.89
0.00
85.00
2.81
1.89
0.00
86.00
2.81
1.89
0.00
87.00
2.81
1.89
0.00
88.00
2.81
1.89
0.00
89.00
2.81
1.89
0.00
90.00
2.81
1.89
0.00
91.00
2.81
1.89
0.00
92.00
2.81
1.89
0.00
93.00
2.81
1.89
0.00
94.00
2.81
1.89
0.00
95.00
2.81
1.89
0.00
96.00
2.81
1.89
0.00
97.00
2.81
1.89
0.00
98.00
2.81
1.89
0.00
99.00
2.81
1.89
0.00
100.00
2.81
1.89
0.00
101.00
2.81
1.89
0.00
102.00
2.81
1.89
0.00
103.00
2.81
1.89
0.00
104.00
2.81
1.89
0.00
105.00
2.81
1.89
0.00
106.00
2.81
1.89
0.00
107.00
2.81
1.89
0.00
108.00
2.81
1.89
0.00
109.00
2.81
1.89
0.00
110.00
2.81
1.89
0.00
111.00
2.81
1.89
0.00
112.00
2.81
1.89
0.00
113.00
2.81
1.89
0.00
114.00
2.81
1.89
0.00
115.00
2.81
1.89
0.00
116.00
2.81
1.89
0.00
117.00
2.81
1.89
0.00
118.00
2.81
1.89
0.00
119.00
2.81
1.89
0.00
120.00
2.81
1.89
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 15
Summary for Subcatchment 14S: POST TO POND 6
Runoff = 42.36 cfs @ 11.96 hrs, Volume= 1.997 af, Depth= 1.73"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN
Description
10.310 98
Impervious
3.550 61
>75% Grass cover, Good, HSG B
13.860 89
Weighted Average
3.550
25.61 % Pervious Area
10.310
74.39% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 14S: POST TO POND 6
Hydrograph
46
44
--r--I---I--r--r--r--r--r--I---I--r--r--r--r--r--r--r--I--r--r--r--r--r--
-- -- --I --I --I- --I --
cfs--+--L--------------1--1----L-----------1--T--L--�--
■Runoff
42.36
42
----,--T--r----------'-- -- ----r--r--------'I� 1pe-NT24-h�`r-
--I--
40
38
--�--
--'�--
--�-- -- -- ----------�---- -- -- -------1---I
------------r-----------1rr3h1` Ra--irir-f-r-f-rZ--.r-9-"�1r---
36
34
--1--
--r--r--r--r-- -I --- I- - r-r -r ---I---
I I I I I I I - I I ---- ----�--�------------ -- -RunfAt&Ia860t-
32
30
j
----
--�� -
----+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+--
-----1 T--r--r--�1--------T--_T-- +
I I rrOffl tfplt�mle 1: - f
28
w 26
----
I
--I--
---- -- -- ----------I---I-- --
I I I I I I I I I I I I I I I I
------I----r--r--r--Ru'IDepth l.73�` _
--I----t--r--r--no#f
24
0 22
ME 20
20
--�--
--'--
--r-
--�------------------�---- -- ----- I
--'----+--L---------------------------'- y��=}^
--I--r--+--r--r--r--I---I--r--r--r--+--r--r--r--I--r--r--+--r--r--
18
----
------ -------------------?--?------------------- {�
"$-
16
----
---- --+-- ------------ -- -- -- -- --------- -- -�i�
14
--i--
--i----T--r--r--------i-- -- ----r--r--Ir-----1--7---t _r r--II-
12
j
--'--
-----'---'-----------------'---' ---'-----------------'---' ---'-----'---
10
----
---+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+--
8
I
I I
6
--'--
I
---!--! --! --!-----------'--! --! --! --!-----------'--! --! --! --'---
I I I I I I I I I I I I I I I I I I I I I
4
--�--
---+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 16
Hydrograph for Subcatchment 14S: POST TO POND 6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.03
8.00
0.34
0.01
0.11
9.00
0.41
0.02
0.26
10.00
0.51
0.05
0.47
11.00
0.66
0.10
1.16
12.00
1.86
0.92
36.50
13.00
2.17
1.17
2.16
14.00
2.30
1.28
1.30
15.00
2.40
1.37
1.04
16.00
2.47
1.43
0.81
17.00
2.53
1.48
0.71
18.00
2.59
1.53
0.63
19.00
2.64
1.57
0.54
20.00
2.68
1.61
0.46
21.00
2.71
1.64
0.44
22.00
2.75
1.67
0.42
23.00
2.78
1.70
0.40
24.00
2.81
1.73
0.39
25.00
2.81
1.73
0.00
26.00
2.81
1.73
0.00
27.00
2.81
1.73
0.00
28.00
2.81
1.73
0.00
29.00
2.81
1.73
0.00
30.00
2.81
1.73
0.00
31.00
2.81
1.73
0.00
32.00
2.81
1.73
0.00
33.00
2.81
1.73
0.00
34.00
2.81
1.73
0.00
35.00
2.81
1.73
0.00
36.00
2.81
1.73
0.00
37.00
2.81
1.73
0.00
38.00
2.81
1.73
0.00
39.00
2.81
1.73
0.00
40.00
2.81
1.73
0.00
41.00
2.81
1.73
0.00
42.00
2.81
1.73
0.00
43.00
2.81
1.73
0.00
44.00
2.81
1.73
0.00
45.00
2.81
1.73
0.00
46.00
2.81
1.73
0.00
47.00
2.81
1.73
0.00
48.00
2.81
1.73
0.00
49.00
2.81
1.73
0.00
50.00
2.81
1.73
0.00
51.00
2.81
1.73
0.00
52.00
2.81
1.73
0.00
53.00
2.81
1.73
0.00
54.00
2.81
1.73
0.00
55.00
2.81
1.73
0.00
56.00
2.81
1.73
0.00
57.00
2.81
1.73
0.00
58.00
2.81
1.73
0.00
59.00
2.81
1.73
0.00
60.00
2.81
1.73
0.00
61.00
2.81
1.73
0.00
62.00
2.81
1.73
0.00
63.00
2.81
1.73
0.00
64.00
2.81
1.73
0.00
65.00
2.81
1.73
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.73
0.00
67.00
2.81
1.73
0.00
68.00
2.81
1.73
0.00
69.00
2.81
1.73
0.00
70.00
2.81
1.73
0.00
71.00
2.81
1.73
0.00
72.00
2.81
1.73
0.00
73.00
2.81
1.73
0.00
74.00
2.81
1.73
0.00
75.00
2.81
1.73
0.00
76.00
2.81
1.73
0.00
77.00
2.81
1.73
0.00
78.00
2.81
1.73
0.00
79.00
2.81
1.73
0.00
80.00
2.81
1.73
0.00
81.00
2.81
1.73
0.00
82.00
2.81
1.73
0.00
83.00
2.81
1.73
0.00
84.00
2.81
1.73
0.00
85.00
2.81
1.73
0.00
86.00
2.81
1.73
0.00
87.00
2.81
1.73
0.00
88.00
2.81
1.73
0.00
89.00
2.81
1.73
0.00
90.00
2.81
1.73
0.00
91.00
2.81
1.73
0.00
92.00
2.81
1.73
0.00
93.00
2.81
1.73
0.00
94.00
2.81
1.73
0.00
95.00
2.81
1.73
0.00
96.00
2.81
1.73
0.00
97.00
2.81
1.73
0.00
98.00
2.81
1.73
0.00
99.00
2.81
1.73
0.00
100.00
2.81
1.73
0.00
101.00
2.81
1.73
0.00
102.00
2.81
1.73
0.00
103.00
2.81
1.73
0.00
104.00
2.81
1.73
0.00
105.00
2.81
1.73
0.00
106.00
2.81
1.73
0.00
107.00
2.81
1.73
0.00
108.00
2.81
1.73
0.00
109.00
2.81
1.73
0.00
110.00
2.81
1.73
0.00
111.00
2.81
1.73
0.00
112.00
2.81
1.73
0.00
113.00
2.81
1.73
0.00
114.00
2.81
1.73
0.00
115.00
2.81
1.73
0.00
116.00
2.81
1.73
0.00
117.00
2.81
1.73
0.00
118.00
2.81
1.73
0.00
119.00
2.81
1.73
0.00
120.00
2.81
1.73
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 17
Summary for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Runoff = 14.83 cfs @ 11.97 hrs, Volume= 0.720 af, Depth= 0.70"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
3.800 98 Impervious
8.590 61 >75% Grass cover, Good, HSG B
12.390 72 Weighted Average
8.590 69.33% Pervious Area
3.800 30.67% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Hydrograph
16 14.83 CfS - -----------------'I-- -- -----------------'I-- - -----'I--- ■Runoff
15 I I I I I I I I I I I I I I u
+-----+--+--+--r--r-------+--+--+--+--r--r-----
iT-y" 24—hlr-
-- - '.1�rr24hr Rai nfaIIT2.,�81�,"
13 I I
--i--
12 --'I----r--r--r--------'I----r--r-Ruhioff Ar6a:�:12.-894-at -
11
10 --'I-- I�i�npff'I Vp1�m',e=0: 2�-� -
- I I I I I I I I I I I I T F I I I I I I T I
--+- -+--+--+--+--+--+--I__+--+--+--+--+--
Runoff-IDepth4_7ol• -
o $ - -- ------1--L------------J--i--i-- --L--L-----1- c�=}^
7-
6 I I I I I I I I I I I I I I I I I I I I I I
-- - --�--!-r--r--r-- ��'--rt--rt--t r--�'r-- -
5 - -- -----i--L--------------i--i----L--L-----1--J--1--1--L-- --
4
3
2 ---- -----1--L----1---1---1--J--1--1--i--L--L-------J----1--L--L--
1 I I I I I I I I I I I I I I I I I I I I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 18
Hydrograph for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.24
13.86
13.00
2.17
0.37
1.04
14.00
2.30
0.43
0.65
15.00
2.40
0.48
0.54
16.00
2.47
0.51
0.42
17.00
2.53
0.55
0.38
18.00
2.59
0.57
0.34
19.00
2.64
0.60
0.30
20.00
2.68
0.62
0.25
21.00
2.71
0.64
0.24
22.00
2.75
0.66
0.24
23.00
2.78
0.68
0.23
24.00
2.81
0.70
0.22
25.00
2.81
0.70
0.00
26.00
2.81
0.70
0.00
27.00
2.81
0.70
0.00
28.00
2.81
0.70
0.00
29.00
2.81
0.70
0.00
30.00
2.81
0.70
0.00
31.00
2.81
0.70
0.00
32.00
2.81
0.70
0.00
33.00
2.81
0.70
0.00
34.00
2.81
0.70
0.00
35.00
2.81
0.70
0.00
36.00
2.81
0.70
0.00
37.00
2.81
0.70
0.00
38.00
2.81
0.70
0.00
39.00
2.81
0.70
0.00
40.00
2.81
0.70
0.00
41.00
2.81
0.70
0.00
42.00
2.81
0.70
0.00
43.00
2.81
0.70
0.00
44.00
2.81
0.70
0.00
45.00
2.81
0.70
0.00
46.00
2.81
0.70
0.00
47.00
2.81
0.70
0.00
48.00
2.81
0.70
0.00
49.00
2.81
0.70
0.00
50.00
2.81
0.70
0.00
51.00
2.81
0.70
0.00
52.00
2.81
0.70
0.00
53.00
2.81
0.70
0.00
54.00
2.81
0.70
0.00
55.00
2.81
0.70
0.00
56.00
2.81
0.70
0.00
57.00
2.81
0.70
0.00
58.00
2.81
0.70
0.00
59.00
2.81
0.70
0.00
60.00
2.81
0.70
0.00
61.00
2.81
0.70
0.00
62.00
2.81
0.70
0.00
63.00
2.81
0.70
0.00
64.00
2.81
0.70
0.00
65.00
2.81
0.70
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.70
0.00
67.00
2.81
0.70
0.00
68.00
2.81
0.70
0.00
69.00
2.81
0.70
0.00
70.00
2.81
0.70
0.00
71.00
2.81
0.70
0.00
72.00
2.81
0.70
0.00
73.00
2.81
0.70
0.00
74.00
2.81
0.70
0.00
75.00
2.81
0.70
0.00
76.00
2.81
0.70
0.00
77.00
2.81
0.70
0.00
78.00
2.81
0.70
0.00
79.00
2.81
0.70
0.00
80.00
2.81
0.70
0.00
81.00
2.81
0.70
0.00
82.00
2.81
0.70
0.00
83.00
2.81
0.70
0.00
84.00
2.81
0.70
0.00
85.00
2.81
0.70
0.00
86.00
2.81
0.70
0.00
87.00
2.81
0.70
0.00
88.00
2.81
0.70
0.00
89.00
2.81
0.70
0.00
90.00
2.81
0.70
0.00
91.00
2.81
0.70
0.00
92.00
2.81
0.70
0.00
93.00
2.81
0.70
0.00
94.00
2.81
0.70
0.00
95.00
2.81
0.70
0.00
96.00
2.81
0.70
0.00
97.00
2.81
0.70
0.00
98.00
2.81
0.70
0.00
99.00
2.81
0.70
0.00
100.00
2.81
0.70
0.00
101.00
2.81
0.70
0.00
102.00
2.81
0.70
0.00
103.00
2.81
0.70
0.00
104.00
2.81
0.70
0.00
105.00
2.81
0.70
0.00
106.00
2.81
0.70
0.00
107.00
2.81
0.70
0.00
108.00
2.81
0.70
0.00
109.00
2.81
0.70
0.00
110.00
2.81
0.70
0.00
111.00
2.81
0.70
0.00
112.00
2.81
0.70
0.00
113.00
2.81
0.70
0.00
114.00
2.81
0.70
0.00
115.00
2.81
0.70
0.00
116.00
2.81
0.70
0.00
117.00
2.81
0.70
0.00
118.00
2.81
0.70
0.00
119.00
2.81
0.70
0.00
120.00
2.81
0.70
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 19
Summary for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Runoff = 1.22 cfs @ 12.26 hrs, Volume= 0.265 af, Depth= 0.22"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac)
CN
Description
7.730
55
Woods, Good, HSG B
7.000
61
>75% Grass cover, Good, HSG B
14.730
58
Weighted Average
14.730
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Hydrograph
� � � � � � �� �� � � � � �� �� �� �� �� �� � � � � � ❑Runoff
1.22 Cfs
Type 11'; 24-h';r
Runoff Arch=14.730 at
R4npff';VQ10me=',0.26$ calf
Runoff off ' D e pt h TO . 22';"
3 F16'� LOngth=1,16a'
0 W
Tc=�1.',9 mip
OWSIB
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 20
Hydrograph for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.02
0.11
13.00
2.17
0.07
0.54
14.00
2.30
0.09
0.35
15.00
2.40
0.11
0.29
16.00
2.47
0.13
0.24
17.00
2.53
0.14
0.21
18.00
2.59
0.15
0.20
19.00
2.64
0.17
0.18
20.00
2.68
0.18
0.15
21.00
2.71
0.19
0.14
22.00
2.75
0.20
0.14
23.00
2.78
0.21
0.14
24.00
2.81
0.22
0.14
25.00
2.81
0.22
0.00
26.00
2.81
0.22
0.00
27.00
2.81
0.22
0.00
28.00
2.81
0.22
0.00
29.00
2.81
0.22
0.00
30.00
2.81
0.22
0.00
31.00
2.81
0.22
0.00
32.00
2.81
0.22
0.00
33.00
2.81
0.22
0.00
34.00
2.81
0.22
0.00
35.00
2.81
0.22
0.00
36.00
2.81
0.22
0.00
37.00
2.81
0.22
0.00
38.00
2.81
0.22
0.00
39.00
2.81
0.22
0.00
40.00
2.81
0.22
0.00
41.00
2.81
0.22
0.00
42.00
2.81
0.22
0.00
43.00
2.81
0.22
0.00
44.00
2.81
0.22
0.00
45.00
2.81
0.22
0.00
46.00
2.81
0.22
0.00
47.00
2.81
0.22
0.00
48.00
2.81
0.22
0.00
49.00
2.81
0.22
0.00
50.00
2.81
0.22
0.00
51.00
2.81
0.22
0.00
52.00
2.81
0.22
0.00
53.00
2.81
0.22
0.00
54.00
2.81
0.22
0.00
55.00
2.81
0.22
0.00
56.00
2.81
0.22
0.00
57.00
2.81
0.22
0.00
58.00
2.81
0.22
0.00
59.00
2.81
0.22
0.00
60.00
2.81
0.22
0.00
61.00
2.81
0.22
0.00
62.00
2.81
0.22
0.00
63.00
2.81
0.22
0.00
64.00
2.81
0.22
0.00
65.00
2.81
0.22
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.22
0.00
67.00
2.81
0.22
0.00
68.00
2.81
0.22
0.00
69.00
2.81
0.22
0.00
70.00
2.81
0.22
0.00
71.00
2.81
0.22
0.00
72.00
2.81
0.22
0.00
73.00
2.81
0.22
0.00
74.00
2.81
0.22
0.00
75.00
2.81
0.22
0.00
76.00
2.81
0.22
0.00
77.00
2.81
0.22
0.00
78.00
2.81
0.22
0.00
79.00
2.81
0.22
0.00
80.00
2.81
0.22
0.00
81.00
2.81
0.22
0.00
82.00
2.81
0.22
0.00
83.00
2.81
0.22
0.00
84.00
2.81
0.22
0.00
85.00
2.81
0.22
0.00
86.00
2.81
0.22
0.00
87.00
2.81
0.22
0.00
88.00
2.81
0.22
0.00
89.00
2.81
0.22
0.00
90.00
2.81
0.22
0.00
91.00
2.81
0.22
0.00
92.00
2.81
0.22
0.00
93.00
2.81
0.22
0.00
94.00
2.81
0.22
0.00
95.00
2.81
0.22
0.00
96.00
2.81
0.22
0.00
97.00
2.81
0.22
0.00
98.00
2.81
0.22
0.00
99.00
2.81
0.22
0.00
100.00
2.81
0.22
0.00
101.00
2.81
0.22
0.00
102.00
2.81
0.22
0.00
103.00
2.81
0.22
0.00
104.00
2.81
0.22
0.00
105.00
2.81
0.22
0.00
106.00
2.81
0.22
0.00
107.00
2.81
0.22
0.00
108.00
2.81
0.22
0.00
109.00
2.81
0.22
0.00
110.00
2.81
0.22
0.00
111.00
2.81
0.22
0.00
112.00
2.81
0.22
0.00
113.00
2.81
0.22
0.00
114.00
2.81
0.22
0.00
115.00
2.81
0.22
0.00
116.00
2.81
0.22
0.00
117.00
2.81
0.22
0.00
118.00
2.81
0.22
0.00
119.00
2.81
0.22
0.00
120.00
2.81
0.22
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 21
Summary for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Runoff = 0.40 cfs @ 12.25 hrs, Volume= 0.076 af, Depth= 0.24"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac)
CN
Description
3.190
55
Woods, Good, HSG B
0.580
78
Row crops, straight row, Good, HSG B
3.770
59
Weighted Average
3.770
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Hydrograph
-------;---------- --;--------;-- ----------- ---------
0.44-L--L-------J--L--L--L-----'-- --L--L----------L--L--L--'--
0.42 0.40 -- -----I-- -- --+--+-----I-- -- ----------I----+--r--I--
0.4 -- - - --,------- -,-- -- +--,-----,-- -- +--, --, __Ty���1 24-- r
0.38--'---- --'-----'---- --' --'-----'---- --' --'--- �/ -
0.36 --'----L--L--'---'-- -- --+----'---'lyr;24ir_Rairtfa1 2.917-
0.32 --,-- -------------li-- ----------li-- R1.1�f /'AI�i�3./'�V �It
0.3 j ---- -- --------- -- --L-------'--L-+--L--------'--���--L--L--I-{-
0.28 --�-- +--+--+-------+--+--+--+---- "Y•• [qme 0.-0 cjI
0.26 ---- +--+--r--r--i--+--+--+--r--r--i--+--+--r--r--i---i--+--+--r--r-
u 0.24 --; - -- ; --; --; ---- -- -- ; --; --; ---- ' --Run D pth=� 4 -
3 0.22 --'----L--L--'---'------L--L--'-------L--L------------L--L--'--
F]A6W� L4n#0th_11t6T
O
0.18 -- - -1 _F F 1--7--+--r--I---1---1--+--r-- ---- -r----
0.16 --,-- ---------------- ------------ ----------�Tlp=�-.9�111-
0.14 --'----L--L-------J--L--L--L-----'----L--L-----'---'--L- L ' -
0.12
��-
0.1 - -i
0.08 --'-- --'--'---'---'---'---'--'---'---'---'---'---'--'---'---'---'---'--'---'---'--
0.06 --'-- - -L--1---1--J--1--1--L--1---'--L--+--L----------L--+--L--'--
0.04 - ---
-+- r--r--+-+--+--+--r--r--i--+--+--r--r--+--i--+--+--r--r-
0.02
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)
■ Runoff

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 22
Hydrograph for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.03
0.04
13.00
2.17
0.08
0.15
14.00
2.30
0.11
0.10
15.00
2.40
0.13
0.08
16.00
2.47
0.15
0.07
17.00
2.53
0.16
0.06
18.00
2.59
0.18
0.05
19.00
2.64
0.19
0.05
20.00
2.68
0.20
0.04
21.00
2.71
0.21
0.04
22.00
2.75
0.22
0.04
23.00
2.78
0.23
0.04
24.00
2.81
0.24
0.04
25.00
2.81
0.24
0.00
26.00
2.81
0.24
0.00
27.00
2.81
0.24
0.00
28.00
2.81
0.24
0.00
29.00
2.81
0.24
0.00
30.00
2.81
0.24
0.00
31.00
2.81
0.24
0.00
32.00
2.81
0.24
0.00
33.00
2.81
0.24
0.00
34.00
2.81
0.24
0.00
35.00
2.81
0.24
0.00
36.00
2.81
0.24
0.00
37.00
2.81
0.24
0.00
38.00
2.81
0.24
0.00
39.00
2.81
0.24
0.00
40.00
2.81
0.24
0.00
41.00
2.81
0.24
0.00
42.00
2.81
0.24
0.00
43.00
2.81
0.24
0.00
44.00
2.81
0.24
0.00
45.00
2.81
0.24
0.00
46.00
2.81
0.24
0.00
47.00
2.81
0.24
0.00
48.00
2.81
0.24
0.00
49.00
2.81
0.24
0.00
50.00
2.81
0.24
0.00
51.00
2.81
0.24
0.00
52.00
2.81
0.24
0.00
53.00
2.81
0.24
0.00
54.00
2.81
0.24
0.00
55.00
2.81
0.24
0.00
56.00
2.81
0.24
0.00
57.00
2.81
0.24
0.00
58.00
2.81
0.24
0.00
59.00
2.81
0.24
0.00
60.00
2.81
0.24
0.00
61.00
2.81
0.24
0.00
62.00
2.81
0.24
0.00
63.00
2.81
0.24
0.00
64.00
2.81
0.24
0.00
65.00
2.81
0.24
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.24
0.00
67.00
2.81
0.24
0.00
68.00
2.81
0.24
0.00
69.00
2.81
0.24
0.00
70.00
2.81
0.24
0.00
71.00
2.81
0.24
0.00
72.00
2.81
0.24
0.00
73.00
2.81
0.24
0.00
74.00
2.81
0.24
0.00
75.00
2.81
0.24
0.00
76.00
2.81
0.24
0.00
77.00
2.81
0.24
0.00
78.00
2.81
0.24
0.00
79.00
2.81
0.24
0.00
80.00
2.81
0.24
0.00
81.00
2.81
0.24
0.00
82.00
2.81
0.24
0.00
83.00
2.81
0.24
0.00
84.00
2.81
0.24
0.00
85.00
2.81
0.24
0.00
86.00
2.81
0.24
0.00
87.00
2.81
0.24
0.00
88.00
2.81
0.24
0.00
89.00
2.81
0.24
0.00
90.00
2.81
0.24
0.00
91.00
2.81
0.24
0.00
92.00
2.81
0.24
0.00
93.00
2.81
0.24
0.00
94.00
2.81
0.24
0.00
95.00
2.81
0.24
0.00
96.00
2.81
0.24
0.00
97.00
2.81
0.24
0.00
98.00
2.81
0.24
0.00
99.00
2.81
0.24
0.00
100.00
2.81
0.24
0.00
101.00
2.81
0.24
0.00
102.00
2.81
0.24
0.00
103.00
2.81
0.24
0.00
104.00
2.81
0.24
0.00
105.00
2.81
0.24
0.00
106.00
2.81
0.24
0.00
107.00
2.81
0.24
0.00
108.00
2.81
0.24
0.00
109.00
2.81
0.24
0.00
110.00
2.81
0.24
0.00
111.00
2.81
0.24
0.00
112.00
2.81
0.24
0.00
113.00
2.81
0.24
0.00
114.00
2.81
0.24
0.00
115.00
2.81
0.24
0.00
116.00
2.81
0.24
0.00
117.00
2.81
0.24
0.00
118.00
2.81
0.24
0.00
119.00
2.81
0.24
0.00
120.00
2.81
0.24
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 23
Summary for Pond 2P: POND 2
Inflow Area = 19.790 ac, 74.23% Impervious, Inflow Depth = 1.65" for lyr-24hr event
Inflow = 58.05 cfs @ 11.96 hrs, Volume= 2.722 of
Outflow = 0.95 cfs @ 17.37 hrs, Volume= 2.706 af, Atten= 98%, Lag= 325.1 min
Primary = 0.95 cfs @ 17.37 hrs, Volume= 2.706 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 713.90' @ 17.37 hrs Surf.Area= 27,697 sf Storage= 83,018 cf
Plug -Flow detention time= 1,117.2 min calculated for 2.706 of (99% of inflow)
Center -of -Mass det. time= 1,113.6 min ( 1,930.1 - 816.5 )
Volume Invert
Avail.Storage Storage Description
#1 710.50'
290,610 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.50
20,568
0 0
711.00
22,310
10,720 10,720
712.00
24,113
23,212 33,931
713.00
25,975
25,044 58,975
714.00
27,897
26,936 85,911
715.00
29,879
28,888 114,799
716.00
31,920
30,900 145,699
717.00
34,021
32,971 178,669
718.00
36,183
35,102 213,771
719.00
38,404
37,294 251,065
720.00
40,686
39,545 290,610
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.50'
4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Slotted Weirs X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=0.95 cfs @ 17.37 hrs HW=713.90' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 0.95 cfs of 28.09 cfs potential flow)
2=4.5" Orifice (Orifice Controls 0.95 cfs @ 8.62 fps)
3=Slotted Weirs ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.50' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 24
.....
1
I%
M1111186IMM

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.50
0.00
0.00
0.00
2.50
0.00
0
710.50
0.00
0.00
0.00
5.00
0.00
0
710.50
0.00
0.00
0.00
7.50
0.05
46
710.50
0.00
0.00
0.00
10.00
0.58
2,277
710.61
0.03
0.03
0.00
12.50
4.76
68,944
713.38
0.87
0.87
0.00
15.00
1.45
81,394
713.84
0.94
0.94
0.00
17.50
0.94
83,015
713.90
0.95
0.95
0.00
20.00
0.64
81,586
713.84
0.94
0.94
0.00
22.50
0.58
78,616
713.74
0.93
0.93
0.00
25.00
0.00
73,538
713.55
0.90
0.90
0.00
27.50
0.00
65,654
713.25
0.85
0.85
0.00
30.00
0.00
58,203
712.97
0.80
0.80
0.00
32.50
0.00
51,195
712.70
0.75
0.75
0.00
35.00
0.00
44,636
712.44
0.70
0.70
0.00
37.50
0.00
38,538
712.19
0.65
0.65
0.00
40.00
0.00
32,907
711.96
0.60
0.60
0.00
42.50
0.00
27,753
711.74
0.55
0.55
0.00
45.00
0.00
23,083
711.54
0.49
0.49
0.00
47.50
0.00
18,905
711.36
0.44
0.44
0.00
50.00
0.00
15,226
711.20
0.38
0.38
0.00
52.50
0.00
12,052
711.06
0.32
0.32
0.00
55.00
0.00
9,389
710.94
0.27
0.27
0.00
57.50
0.00
7,240
710.84
0.21
0.21
0.00
60.00
0.00
5,632
710.77
0.15
0.15
0.00
62.50
0.00
4,510
710.72
0.10
0.10
0.00
65.00
0.00
3,719
710.68
0.07
0.07
0.00
67.50
0.00
3,143
710.65
0.05
0.05
0.00
70.00
0.00
2,710
710.63
0.04
0.04
0.00
72.50
0.00
2,376
710.61
0.03
0.03
0.00
75.00
0.00
2,111
710.60
0.03
0.03
0.00
77.50
0.00
1,897
710.59
0.02
0.02
0.00
80.00
0.00
1,721
710.58
0.02
0.02
0.00
82.50
0.00
1,573
710.58
0.02
0.02
0.00
85.00
0.00
1,448
710.57
0.01
0.01
0.00
87.50
0.00
1,341
710.56
0.01
0.01
0.00
90.00
0.00
1,248
710.56
0.01
0.01
0.00
92.50
0.00
1,167
710.56
0.01
0.01
0.00
95.00
0.00
1,095
710.55
0.01
0.01
0.00
97.50
0.00
1,032
710.55
0.01
0.01
0.00
100.00
0.00
975
710.55
0.01
0.01
0.00
102.50
0.00
924
710.54
0.01
0.01
0.00
105.00
0.00
878
710.54
0.00
0.00
0.00
107.50
0.00
837
710.54
0.00
0.00
0.00
110.00
0.00
799
710.54
0.00
0.00
0.00
112.50
0.00
764
710.54
0.00
0.00
0.00
115.00
0.00
732
710.54
0.00
0.00
0.00
117.50
0.00
703
710.53
0.00
0.00
0.00
120.00
0.00
675
710.53
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 26
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.50
0.00
0.00
0.00
710.60
0.03
0.03
0.00
710.70
0.09
0.09
0.00
710.80
0.18
0.18
0.00
710.90
0.25
0.25
0.00
711.00
0.30
0.30
0.00
711.10
0.34
0.34
0.00
711.20
0.38
0.38
0.00
711.30
0.42
0.42
0.00
711.40
0.45
0.45
0.00
711.50
0.48
0.48
0.00
711.60
0.51
0.51
0.00
711.70
0.54
0.54
0.00
711.80
0.56
0.56
0.00
711.90
0.59
0.59
0.00
712.00
0.61
0.61
0.00
712.10
0.63
0.63
0.00
712.20
0.65
0.65
0.00
712.30
0.68
0.68
0.00
712.40
0.70
0.70
0.00
712.50
0.72
0.72
0.00
712.60
0.74
0.74
0.00
712.70
0.75
0.75
0.00
712.80
0.77
0.77
0.00
712.90
0.79
0.79
0.00
713.00
0.81
0.81
0.00
713.10
0.83
0.83
0.00
713.20
0.84
0.84
0.00
713.30
0.86
0.86
0.00
713.40
0.88
0.88
0.00
713.50
0.89
0.89
0.00
713.60
0.91
0.91
0.00
713.70
0.92
0.92
0.00
713.80
0.94
0.94
0.00
713.90
0.95
0.95
0.00
714.00
0.97
0.97
0.00
714.10
0.98
0.98
0.00
714.20
1.00
1.00
0.00
714.30
1.01
1.01
0.00
714.40
1.02
1.02
0.00
714.50
1.04
1.04
0.00
714.60
1.05
1.05
0.00
714.70
1.07
1.07
0.00
714.80
1.08
1.08
0.00
714.90
1.09
1.09
0.00
715.00
1.10
1.10
0.00
715.10
2.03
2.03
0.00
715.20
3.71
3.71
0.00
715.30
5.89
5.89
0.00
715.40
8.46
8.46
0.00
715.50
11.38
11.38
0.00
715.60
13.69
13.69
0.00
715.70
15.53
15.53
0.00
715.80
17.13
17.13
0.00
715.90
18.57
18.57
0.00
716.00
19.90
19.90
0.00
716.10
21.14
21.14
0.00
716.20
22.31
22.31
0.00
716.30
23.41
23.41
0.00
716.40
24.46
24.46
0.00
716.50
25.47
25.47
0.00
716.60
26.43
26.43
0.00
716.70
27.36
27.36
0.00
716.80
28.26
28.26
0.00
716.90
29.13
29.13
0.00
717.00
29.97
29.97
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
717.10
30.80
30.80
0.00
717.20
31.59
31.59
0.00
717.30
32.37
32.37
0.00
717.40
33.13
33.13
0.00
717.50
33.87
33.87
0.00
717.60
34.60
34.60
0.00
717.70
35.31
35.31
0.00
717.80
36.00
36.00
0.00
717.90
36.69
36.69
0.00
718.00
37.36
37.36
0.00
718.10
39.67
39.67
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 27
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.50
20,568
0
710.60
20,916
2,074
710.70
21,265
4,183
710.80
21,613
6,327
710.90
21,962
8,506
711.00
22,310
10,720
711.10
22,490
12,960
711.20
22,671
15,218
711.30
22,851
17,494
711.40
23,031
19,788
711.50
23,212
22,100
711.60
23,392
24,430
711.70
23,572
26,778
711.80
23,752
29,144
711.90
23,933
31,529
712.00
24,113
33,931
712.10
24,299
36,352
712.20
24,485
38,791
712.30
24,672
41,249
712.40
24,858
43,725
712.50
25,044
46,220
712.60
25,230
48,734
712.70
25,416
51,266
712.80
25,603
53,817
712.90
25,789
56,387
713.00
25,975
58,975
713.10
26,167
61,582
713.20
26,359
64,208
713.30
26,552
66,854
713.40
26,744
69,519
713.50
26,936
72,203
713.60
27,128
74,906
713.70
27,320
77,628
713.80
27,513
80,370
713.90
27,705
83,131
714.00
27,897
85,911
714.10
28,095
88,711
714.20
28,293
91,530
714.30
28,492
94,369
714.40
28,690
97,228
714.50
28,888
100,107
714.60
29,086
103,006
714.70
29,284
105,924
714.80
29,483
108,863
714.90
29,681
111,821
715.00
29,879
114,799
715.10
30,083
117,797
715.20
30,287
120,816
715.30
30,491
123,855
715.40
30,695
126,914
715.50
30,900
129,994
715.60
31,104
133,094
715.70
31,308
136,214
715.80
31,512
139,355
715.90
31,716
142,517
716.00
31,920
145,699
716.10
32,130
148,901
716.20
32,340
152,125
716.30
32,550
155,369
716.40
32,760
158,635
716.50
32,971
161,921
716.60
33,181
165,229
716.70
33,391
168,557
716.80
33,601
171,907
716.90
33,811
175,277
717.00
34.021
178.669
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
717.10
34,237
182,082
717.20
34,453
185,516
717.30
34,670
188,973
717.40
34,886
192,450
717.50
35,102
195,950
717.60
35,318
199,471
717.70
35,534
203,013
717.80
35,751
206,578
717.90
35,967
210,164
718.00
36,183
213,771
718.10
36,405
217,400
718.20
36,627
221,052
718.30
36,849
224,726
718.40
37,071
228,422
718.50
37,294
232,140
718.60
37,516
235,881
718.70
37,738
239,643
718.80
37,960
243,428
718.90
38,182
247,235
719.00
38,404
251,065
719.10
38,632
254,916
719.20
38,860
258,791
719.30
39,089
262,688
719.40
39,317
266,609
719.50
39,545
270,552
719.60
39,773
274,518
719.70
40,001
278,506
719.80
40,230
282,518
719.90
40,458
286,552
720.00
40,686
290,610

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 28
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 1.65" for lyr-24hr event
Inflow = 44.76 cfs @ 11.96 hrs, Volume= 2.099 of
Outflow = 0.63 cfs @ 18.55 hrs, Volume= 2.076 af, Atten= 99%, Lag= 395.5 min
Primary = 0.63 cfs @ 18.55 hrs, Volume= 2.076 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 703.09' @ 18.55 hrs Surf.Area= 48,715 sf Storage= 66,661 cf
Plug -Flow detention time= 1,349.6 min calculated for 2.076 of (99% of inflow)
Center -of -Mass det. time= 1,343.0 min ( 2,159.5 - 816.5 )
Volume
Invert Avail.Storage Storage Description
#1
701.50'
519,480 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.50
22,118
0
0
702.00
43,792
16,478
16,478
703.00
48,320
46,056
62,534
704.00
52,961
50,641
113,174
705.00
57,717
55,339
168,513
706.00
62,582
60,150
228,663
707.00
67,552
65,067
293,730
708.00
72,628
70,090
363,820
709.00
77,809
75,219
439,038
710.00
83,074
80,442
519,480
Device Routing Invert Outlet Devices
#1 Primary 701.39' 24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1 701.50' 4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1 705.00' 36.0" W x 6.0" H Vert. Slotted Weirs X 2.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=0.63 cfs @ 18.55 hrs HW=703.09' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 0.63 cfs of 10.29 cfs potential flow)
2=4.5" Orifice (Orifice Controls 0.63 cfs @ 5.69 fps)
3=Slotted Weirs ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.50' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 29
'0=6 1 E:iAZORIII&I
.....
• �1
• • .. ..
1101
•
I/
1 11
////
iiiiiiiiiio�
////////////////////////////////////////////////////////////////////////////////////////�

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.50
0.00
0.00
0.00
2.50
0.00
0
701.50
0.00
0.00
0.00
5.00
0.00
0
701.50
0.00
0.00
0.00
7.50
0.04
35
701.50
0.00
0.00
0.00
10.00
0.44
1,772
701.57
0.01
0.01
0.00
12.50
3.67
53,659
702.81
0.56
0.56
0.00
15.00
1.12
64,253
703.04
0.62
0.62
0.00
17.50
0.72
66,481
703.08
0.63
0.63
0.00
20.00
0.50
66,317
703.08
0.63
0.63
0.00
22.50
0.45
64,913
703.05
0.62
0.62
0.00
25.00
0.00
61,826
702.99
0.61
0.61
0.00
27.50
0.00
56,492
702.87
0.58
0.58
0.00
30.00
0.00
51,399
702.77
0.55
0.55
0.00
32.50
0.00
46,547
702.66
0.53
0.53
0.00
35.00
0.00
41,941
702.56
0.50
0.50
0.00
37.50
0.00
37,581
702.47
0.47
0.47
0.00
40.00
0.00
33,471
702.38
0.44
0.44
0.00
42.50
0.00
29,613
702.30
0.41
0.41
0.00
45.00
0.00
26,009
702.22
0.39
0.39
0.00
47.50
0.00
22,660
702.14
0.36
0.36
0.00
50.00
0.00
19,569
702.07
0.33
0.33
0.00
52.50
0.00
16,738
702.01
0.30
0.30
0.00
55.00
0.00
14,170
701.95
0.27
0.27
0.00
57.50
0.00
11,878
701.89
0.24
0.24
0.00
60.00
0.00
9,871
701.84
0.21
0.21
0.00
62.50
0.00
8,195
701.79
0.17
0.17
0.00
65.00
0.00
6,852
701.75
0.13
0.13
0.00
67.50
0.00
5,792
701.72
0.10
0.10
0.00
70.00
0.00
4,956
701.69
0.08
0.08
0.00
72.50
0.00
4,290
701.67
0.07
0.07
0.00
75.00
0.00
3,756
701.65
0.05
0.05
0.00
77.50
0.00
3,323
701.63
0.04
0.04
0.00
80.00
0.00
2,967
701.62
0.04
0.04
0.00
82.50
0.00
2,671
701.61
0.03
0.03
0.00
85.00
0.00
2,423
701.60
0.03
0.03
0.00
87.50
0.00
2,212
701.59
0.02
0.02
0.00
90.00
0.00
2,032
701.58
0.02
0.02
0.00
92.50
0.00
1,876
701.58
0.02
0.02
0.00
95.00
0.00
1,740
701.57
0.01
0.01
0.00
97.50
0.00
1,622
701.57
0.01
0.01
0.00
100.00
0.00
1,517
701.56
0.01
0.01
0.00
102.50
0.00
1,424
701.56
0.01
0.01
0.00
105.00
0.00
1,341
701.56
0.01
0.01
0.00
107.50
0.00
1,266
701.55
0.01
0.01
0.00
110.00
0.00
1,199
701.55
0.01
0.01
0.00
112.50
0.00
1,138
701.55
0.01
0.01
0.00
115.00
0.00
1,083
701.55
0.01
0.01
0.00
117.50
0.00
1,033
701.54
0.01
0.01
0.00
120.00
0.00
987
701.54
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 31
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.50
0.00
0.00
0.00
701.60
0.03
0.03
0.00
701.70
0.09
0.09
0.00
701.80
0.18
0.18
0.00
701.90
0.25
0.25
0.00
702.00
0.30
0.30
0.00
702.10
0.34
0.34
0.00
702.20
0.38
0.38
0.00
702.30
0.42
0.42
0.00
702.40
0.45
0.45
0.00
702.50
0.48
0.48
0.00
702.60
0.51
0.51
0.00
702.70
0.54
0.54
0.00
702.80
0.56
0.56
0.00
702.90
0.59
0.59
0.00
703.00
0.61
0.61
0.00
703.10
0.63
0.63
0.00
703.20
0.65
0.65
0.00
703.30
0.68
0.68
0.00
703.40
0.70
0.70
0.00
703.50
0.72
0.72
0.00
703.60
0.74
0.74
0.00
703.70
0.75
0.75
0.00
703.80
0.77
0.77
0.00
703.90
0.79
0.79
0.00
704.00
0.81
0.81
0.00
704.10
0.83
0.83
0.00
704.20
0.84
0.84
0.00
704.30
0.86
0.86
0.00
704.40
0.88
0.88
0.00
704.50
0.89
0.89
0.00
704.60
0.91
0.91
0.00
704.70
0.92
0.92
0.00
704.80
0.94
0.94
0.00
704.90
0.95
0.95
0.00
705.00
0.97
0.97
0.00
705.10
1.59
1.59
0.00
705.20
2.72
2.72
0.00
705.30
4.18
4.18
0.00
705.40
5.90
5.90
0.00
705.50
7.85
7.85
0.00
705.60
9.39
9.39
0.00
705.70
10.62
10.62
0.00
705.80
11.69
11.69
0.00
705.90
12.66
12.66
0.00
706.00
13.55
13.55
0.00
706.10
14.39
14.39
0.00
706.20
15.17
15.17
0.00
706.30
15.91
15.91
0.00
706.40
16.61
16.61
0.00
706.50
17.29
17.29
0.00
706.60
17.94
17.94
0.00
706.70
18.56
18.56
0.00
706.80
19.17
19.17
0.00
706.90
19.75
19.75
0.00
707.00
20.32
20.32
0.00
707.10
20.87
20.87
0.00
707.20
21.41
21.41
0.00
707.30
21.93
21.93
0.00
707.40
22.44
22.44
0.00
707.50
22.94
22.94
0.00
707.60
23.43
23.43
0.00
707.70
23.90
23.90
0.00
707.80
24.37
24.37
0.00
707.90
24.83
24.83
0.00
708.00
25.28
25.28
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.10
27.38
27.38
0.00
708.20
30.84
30.84
0.00
708.30
35.18
35.18
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 32
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.50
22,118
0
701.60
26,453
2,429
701.70
30,788
5,291
701.80
35,122
8,586
701.90
39,457
12,315
702.00
43,792
16,478
702.10
44,245
20,879
702.20
44,698
25,326
702.30
45,150
29,819
702.40
45,603
34,357
702.50
46,056
38,940
702.60
46,509
43,568
702.70
46,962
48,241
702.80
47,414
52,960
702.90
47,867
57,724
703.00
48,320
62,534
703.10
48,784
67,389
703.20
49,248
72,290
703.30
49,712
77,238
703.40
50,176
82,233
703.50
50,641
87,274
703.60
51,105
92,361
703.70
51,569
97,495
703.80
52,033
102,675
703.90
52,497
107,901
704.00
52,961
113,174
704.10
53,437
118,494
704.20
53,912
123,861
704.30
54,388
129,276
704.40
54,863
134,739
704.50
55,339
140,249
704.60
55,815
145,807
704.70
56,290
151,412
704.80
56,766
157,065
704.90
57,241
162,765
705.00
57,717
168,513
705.10
58,204
174,309
705.20
58,690
180,154
705.30
59,176
186,047
705.40
59,663
191,989
705.50
60,150
197,980
705.60
60,636
204,019
705.70
61,123
210,107
705.80
61,609
216,243
705.90
62,095
222,429
706.00
62,582
228,663
706.10
63,079
234,946
706.20
63,576
241,278
706.30
64,073
247,661
706.40
64,570
254,093
706.50
65,067
260,575
706.60
65,564
267,106
706.70
66,061
273,688
706.80
66,558
280,318
706.90
67,055
286,999
707.00
67,552
293,730
707.10
68,060
300,510
707.20
68,567
307,341
707.30
69,075
314,224
707.40
69,582
321,156
707.50
70,090
328,140
707.60
70,598
335,174
707.70
71,105
342,260
707.80
71,613
349,395
707.90
72,120
356,582
708.00
72.628
363.820
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.10
73,146
371,108
708.20
73,664
378,449
708.30
74,182
385,841
708.40
74,700
393,285
708.50
75,219
400,781
708.60
75,737
408,329
708.70
76,255
415,928
708.80
76,773
423,580
708.90
77,291
431,283
709.00
77,809
439,038
709.10
78,336
446,845
709.20
78,862
454,705
709.30
79,388
462,618
709.40
79,915
470,583
709.50
80,442
478,601
709.60
80,968
486,671
709.70
81,495
494,794
709.80
82,021
502,970
709.90
82,547
511,198
710.00
83,074
519,480

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 33
Summary for Pond 10P: POND 4
Inflow Area = 10.550 ac, 69.48% Impervious, Inflow Depth = 1.57" for lyr-24hr event
Inflow = 29.66 cfs @ 11.96 hrs, Volume= 1.384 of
Outflow = 2.96 cfs @ 12.40 hrs, Volume= 1.384 af, Atten= 90%, Lag= 26.8 min
Primary = 2.96 cfs @ 12.40 hrs, Volume= 1.384 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 680.44' @ 12.40 hrs Surf.Area= 12,174 sf Storage= 26,350 cf
Plug -Flow detention time= 104.3 min calculated for 1.383 of (100% of inflow)
Center -of -Mass det. time= 105.5 min ( 926.0 - 820.4 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
120,639 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
4,560
0 0
678.00
5,909
5,235 5,235
679.00
7,780
6,845 12,079
680.00
10,667
9,224 21,303
681.00
14,076
12,372 33,674
682.00
17,710
15,893 49,567
683.00
21,571
19,641 69,208
684.00
25,659
23,615 92,823
685.00
29,973
27,816 120,639
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
677.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
682.50'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#4 Secondary
683.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=2.96 cfs @ 12.40 hrs HW=680.44' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 2.96 cfs of 25.80 cfs potential flow)
1 2=8" Orifice (Orifice Controls 2.96 cfs @ 8.49 fps)
3=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
4=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 34
'0=6 1 gM1111 191MIX!
.....
• ..
N
N Outflow
�i
• i 1
LInflow
N Primary
N Secondary
32
-. 1 ...
2.
FL
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 10P: POND 4
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.00
0
677.00
0.00
0.00
0.00
7.50
0.00
0
677.00
0.00
0.00
0.00
10.00
0.26
751
677.16
0.09
0.09
0.00
12.50
2.46
26,264
680.43
2.96
2.96
0.00
15.00
0.75
13,038
679.12
2.25
2.25
0.00
17.50
0.49
3,508
677.70
1.01
1.01
0.00
20.00
0.34
1,740
677.36
0.40
0.40
0.00
22.50
0.30
1,512
677.32
0.31
0.31
0.00
25.00
0.00
849
677.18
0.11
0.11
0.00
27.50
0.00
379
677.08
0.02
0.02
0.00
30.00
0.00
240
677.05
0.01
0.01
0.00
32.50
0.00
175
677.04
0.01
0.01
0.00
35.00
0.00
137
677.03
0.00
0.00
0.00
37.50
0.00
113
677.02
0.00
0.00
0.00
40.00
0.00
96
677.02
0.00
0.00
0.00
42.50
0.00
83
677.02
0.00
0.00
0.00
45.00
0.00
74
677.02
0.00
0.00
0.00
47.50
0.00
66
677.01
0.00
0.00
0.00
50.00
0.00
60
677.01
0.00
0.00
0.00
52.50
0.00
54
677.01
0.00
0.00
0.00
55.00
0.00
50
677.01
0.00
0.00
0.00
57.50
0.00
46
677.01
0.00
0.00
0.00
60.00
0.00
43
677.01
0.00
0.00
0.00
62.50
0.00
40
677.01
0.00
0.00
0.00
65.00
0.00
38
677.01
0.00
0.00
0.00
67.50
0.00
36
677.01
0.00
0.00
0.00
70.00
0.00
34
677.01
0.00
0.00
0.00
72.50
0.00
32
677.01
0.00
0.00
0.00
75.00
0.00
31
677.01
0.00
0.00
0.00
77.50
0.00
29
677.01
0.00
0.00
0.00
80.00
0.00
28
677.01
0.00
0.00
0.00
82.50
0.00
27
677.01
0.00
0.00
0.00
85.00
0.00
26
677.01
0.00
0.00
0.00
87.50
0.00
25
677.01
0.00
0.00
0.00
90.00
0.00
24
677.01
0.00
0.00
0.00
92.50
0.00
23
677.00
0.00
0.00
0.00
95.00
0.00
22
677.00
0.00
0.00
0.00
97.50
0.00
21
677.00
0.00
0.00
0.00
100.00
0.00
21
677.00
0.00
0.00
0.00
102.50
0.00
20
677.00
0.00
0.00
0.00
105.00
0.00
19
677.00
0.00
0.00
0.00
107.50
0.00
19
677.00
0.00
0.00
0.00
110.00
0.00
18
677.00
0.00
0.00
0.00
112.50
0.00
18
677.00
0.00
0.00
0.00
115.00
0.00
17
677.00
0.00
0.00
0.00
117.50
0.00
17
677.00
0.00
0.00
0.00
120.00
0.00
16
677.00
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 36
Stage -Discharge for Pond 10P: POND 4
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.13
0.13
0.00
677.30
0.28
0.28
0.00
677.40
0.47
0.47
0.00
677.50
0.68
0.68
0.00
677.60
0.87
0.87
0.00
677.70
1.02
1.02
0.00
677.80
1.15
1.15
0.00
677.90
1.27
1.27
0.00
678.00
1.37
1.37
0.00
678.10
1.47
1.47
0.00
678.20
1.56
1.56
0.00
678.30
1.65
1.65
0.00
678.40
1.74
1.74
0.00
678.50
1.82
1.82
0.00
678.60
1.89
1.89
0.00
678.70
1.96
1.96
0.00
678.80
2.04
2.04
0.00
678.90
2.10
2.10
0.00
679.00
2.17
2.17
0.00
679.10
2.23
2.23
0.00
679.20
2.30
2.30
0.00
679.30
2.36
2.36
0.00
679.40
2.42
2.42
0.00
679.50
2.47
2.47
0.00
679.60
2.53
2.53
0.00
679.70
2.59
2.59
0.00
679.80
2.64
2.64
0.00
679.90
2.69
2.69
0.00
680.00
2.74
2.74
0.00
680.10
2.80
2.80
0.00
680.20
2.85
2.85
0.00
680.30
2.89
2.89
0.00
680.40
2.94
2.94
0.00
680.50
2.99
2.99
0.00
680.60
3.04
3.04
0.00
680.70
3.08
3.08
0.00
680.80
3.13
3.13
0.00
680.90
3.17
3.17
0.00
681.00
3.22
3.22
0.00
681.10
3.26
3.26
0.00
681.20
3.30
3.30
0.00
681.30
3.35
3.35
0.00
681.40
3.39
3.39
0.00
681.50
3.43
3.43
0.00
681.60
3.47
3.47
0.00
681.70
3.51
3.51
0.00
681.80
3.55
3.55
0.00
681.90
3.59
3.59
0.00
682.00
3.63
3.63
0.00
682.10
3.67
3.67
0.00
682.20
3.71
3.71
0.00
682.30
3.75
3.75
0.00
682.40
3.78
3.78
0.00
682.50
3.82
3.82
0.00
682.60
5.51
5.51
0.00
682.70
8.57
8.57
0.00
682.80
12.53
12.53
0.00
682.90
17.20
17.20
0.00
683.00
22.50
22.50
0.00
683.10
28.35
28.35
0.00
683.20
34.71
34.71
0.00
683.30
36.77
36.77
0.00
683.40
37.08
37.08
0.00
683.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
38.48
37.70
0.79
683.70
40.22
38.00
2.23
683.80
42.45
38.30
4.15
683.90
45.07
38.60
6.48
684.00
48.19
38.89
9.30
684.10
51.73
39.18
12.55
684.20
55.26
39.47
15.78
684.30
59.01
39.76
19.25
684.40
62.97
40.05
22.92
684.50
67.13
40.33
26.80
684.60
71.59
40.62
30.98
684.70
76.26
40.90
35.36
684.80
80.90
41.18
39.72
684.90
85.68
41.45
44.23
685.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 37
Stage -Area -Storage for Pond 10P: POND 4
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
4,560
0
677.10
4,695
463
677.20
4,830
939
677.30
4,965
1,429
677.40
5,100
1,932
677.50
5,235
2,449
677.60
5,369
2,979
677.70
5,504
3,523
677.80
5,639
4,080
677.90
5,774
4,650
678.00
5,909
5,235
678.10
6,096
5,835
678.20
6,283
6,454
678.30
6,470
7,091
678.40
6,657
7,748
678.50
6,845
8,423
678.60
7,032
9,117
678.70
7,219
9,829
678.80
7,406
10,560
678.90
7,593
11,310
679.00
7,780
12,079
679.10
8,069
12,871
679.20
8,357
13,693
679.30
8,646
14,543
679.40
8,935
15,422
679.50
9,224
16,330
679.60
9,512
17,267
679.70
9,801
18,232
679.80
10,090
19,227
679.90
10,378
20,250
680.00
10,667
21,303
680.10
11,008
22,386
680.20
11,349
23,504
680.30
11,690
24,656
680.40
12,031
25,842
680.50
12,372
27,062
680.60
12,712
28,316
680.70
13,053
29,605
680.80
13,394
30,927
680.90
13,735
32,283
681.00
14,076
33,674
681.10
14,439
35,100
681.20
14,803
36,562
681.30
15,166
38,060
681.40
15,530
39,595
681.50
15,893
41,166
681.60
16,256
42,774
681.70
16,620
44,418
681.80
16,983
46,098
681.90
17,347
47,814
682.00
17,710
49,567
682.10
18,096
51,357
682.20
18,482
53,186
682.30
18,868
55,054
682.40
19,254
56,960
682.50
19,641
58,905
682.60
20,027
60,888
682.70
20,413
62,910
682.80
20,799
64,971
682.90
21,185
67,070
683.00
21,571
69,208
683.10
21,980
71,385
683.20
22,389
73,603
683.30
22,797
75,863
683.40
23,206
78,163
683.50
23.615
80.504
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
24,024
82,886
683.70
24,433
85,309
683.80
24,841
87,772
683.90
25,250
90,277
684.00
25,659
92,823
684.10
26,090
95,410
684.20
26,522
98,041
684.30
26,953
100,714
684.40
27,385
103,431
684.50
27,816
106,191
684.60
28,247
108,994
684.70
28,679
111,841
684.80
29,110
114,730
684.90
29,542
117,663
685.00
29,973
120,639

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 38
Summary for Pond 11 P: POST - OUTFALL #2
Inflow Area = 60.330 ac, 54.75% Impervious, Inflow Depth > 1.28" for 1yr-24hr event
Inflow = 5.57 cfs @ 12.27 hrs, Volume= 6.430 of
Primary = 5.57 cfs @ 12.27 hrs, Volume= 6.430 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 11 P: POST - OUTFALL #2
Hydrograph
❑ Inflow
6 ❑ Primary
5.57 cfs ------- n
I fl'o J4re - 0'3 0'a
------'-- -- -- --'---- ---------�-- --f--
5
4
V I I I I I I I I I I I I I I I I I I I
3 3
0
LL
2
I I I I I I I I I I I I I I I
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 39
Hydrograph for Pond 11 P: POST - OUTFALL #2
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.00
0.00
8.00
0.00
0.00
9.00
0.02
0.02
10.00
0.13
0.13
11.00
0.56
0.56
12.00
4.04
4.04
13.00
4.91
4.91
14.00
4.51
4.51
15.00
4.10
4.10
16.00
3.60
3.60
17.00
3.06
3.06
18.00
2.56
2.56
19.00
2.26
2.26
20.00
2.12
2.12
21.00
2.05
2.05
22.00
2.02
2.02
23.00
1.99
1.99
24.00
1.96
1.96
25.00
1.62
1.62
26.00
1.53
1.53
27.00
1.48
1.48
28.00
1.44
1.44
29.00
1.40
1.40
30.00
1.37
1.37
31.00
1.33
1.33
32.00
1.30
1.30
33.00
1.27
1.27
34.00
1.24
1.24
35.00
1.20
1.20
36.00
1.17
1.17
37.00
1.14
1.14
38.00
1.11
1.11
39.00
1.08
1.08
40.00
1.04
1.04
41.00
1.01
1.01
42.00
0.98
0.98
43.00
0.95
0.95
44.00
0.91
0.91
45.00
0.88
0.88
46.00
0.85
0.85
47.00
0.81
0.81
48.00
0.78
0.78
49.00
0.74
0.74
50.00
0.71
0.71
51.00
0.68
0.68
52.00
0.64
0.64
53.00
0.61
0.61
54.00
0.57
0.57
55.00
0.54
0.54
56.00
0.50
0.50
57.00
0.47
0.47
58.00
0.43
0.43
59.00
0.39
0.39
60.00
0.35
0.35
61.00
0.32
0.32
62.00
0.29
0.29
63.00
0.26
0.26
64.00
0.23
0.23
65.00
0.21
0.21
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.19
0.19
67.00
0.17
0.17
68.00
0.15
0.15
69.00
0.14
0.14
70.00
0.12
0.12
71.00
0.11
0.11
72.00
0.10
0.10
73.00
0.09
0.09
74.00
0.09
0.09
75.00
0.08
0.08
76.00
0.07
0.07
77.00
0.07
0.07
78.00
0.06
0.06
79.00
0.06
0.06
80.00
0.05
0.05
81.00
0.05
0.05
82.00
0.05
0.05
83.00
0.04
0.04
84.00
0.04
0.04
85.00
0.04
0.04
86.00
0.04
0.04
87.00
0.03
0.03
88.00
0.03
0.03
89.00
0.03
0.03
90.00
0.03
0.03
91.00
0.03
0.03
92.00
0.03
0.03
93.00
0.02
0.02
94.00
0.02
0.02
95.00
0.02
0.02
96.00
0.02
0.02
97.00
0.02
0.02
98.00
0.02
0.02
99.00
0.02
0.02
100.00
0.02
0.02
101.00
0.02
0.02
102.00
0.02
0.02
103.00
0.01
0.01
104.00
0.01
0.01
105.00
0.01
0.01
106.00
0.01
0.01
107.00
0.01
0.01
108.00
0.01
0.01
109.00
0.01
0.01
110.00
0.01
0.01
111.00
0.01
0.01
112.00
0.01
0.01
113.00
0.01
0.01
114.00
0.01
0.01
115.00
0.01
0.01
116.00
0.01
0.01
117.00
0.01
0.01
118.00
0.01
0.01
119.00
0.01
0.01
120.00
0.01
0.01

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 40
Summary for Pond 13P: POND 1
Inflow Area = 36.370 ac, 81.50% Impervious, Inflow Depth = 1.89" for lyr-24hr event
Inflow = 120.03 cfs @ 11.95 hrs, Volume= 5.743 of
Outflow = 5.16 cfs @ 13.25 hrs, Volume= 5.734 af, Atten= 96%, Lag= 77.5 min
Primary = 5.16 cfs @ 13.25 hrs, Volume= 5.734 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 705.28' @ 13.25 hrs Surf.Area= 40,935 sf Storage= 142,816 cf
Plug -Flow detention time= 367.2 min calculated for 5.732 of (100% of inflow)
Center -of -Mass det. time= 368.2 min ( 1,171.7 - 803.4 )
Volume
Invert Avail.Storage Storage Description
#1
701.00'
393,227 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.00
22,606
0
0
702.00
30,532
26,569
26,569
703.00
33,334
31,933
58,502
704.00
36,378
34,856
93,358
705.00
39,732
38,055
131,413
706.00
43,988
41,860
173,273
707.00
49,187
46,588
219,861
708.00
54,818
52,003
271,863
709.00
60,624
57,721
329,584
710.00
66,662
63,643
393,227
Device Routing Invert Outlet Devices
#1 Primary 700.39' 36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 700.39' / 700.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1 701.00' 10.0" Vert. 8" Orifice C= 0.600
#3 Device 1 706.00' 36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=5.16 cfs @ 13.25 hrs HW=705.28' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 5.16 cfs of 60.83 cfs potential flow)
2=8" Orifice (Orifice Controls 5.16 cfs @ 9.47 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 41
'0=6 1 gM10 141ii
Hydrograph
120.03 CfS
---------------------------'--'-
-------c---------'-
IN Inflow
IN Outflow
-�- �--r-�--r-�--r-�--r-�--r
-
� r
Inflow At"=-36,37-0t a -
IN Primary
130
1 1 11
Secondary
r �` 1
110
Storage=' 142,-816 d
90
u 70
3
iO 60
- -,- -,--,
- - J--L-J--L-1--L-J--L-
--�,--, - �,--�,--�,--, - -,--,---,--,
--'--
--�,--,--,--�,--�,--, - -,--�, --,--
-- - -- --'-- - -- - --L- --
50
7--Ir---Ir---r---Ir---Ir-7--Ir---Ir--li--r---Ir---r-7--
40
-�-
20
5.16 cfs
0.00 Cfs
0
0 5 10 15 20 25 30
35 40 45 50 55 60 65 70 75
80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 13P: POND 1
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.00
0.00
0.00
0.00
2.50
0.00
0
701.00
0.00
0.00
0.00
5.00
0.00
0
701.00
0.00
0.00
0.00
7.50
0.39
1,304
701.06
0.01
0.01
0.00
10.00
1.65
8,083
701.34
0.41
0.41
0.00
12.50
9.47
138,747
705.18
5.10
5.10
0.00
15.00
2.84
133,641
705.06
5.01
5.01
0.00
17.50
1.83
110,275
704.46
4.58
4.58
0.00
20.00
1.25
85,297
703.78
4.03
4.03
0.00
22.50
1.12
62,333
703.11
3.42
3.42
0.00
25.00
0.00
40,699
702.45
2.67
2.67
0.00
27.50
0.00
21,122
701.82
1.67
1.67
0.00
30.00
0.00
10,958
701.45
0.68
0.68
0.00
32.50
0.00
6,812
701.29
0.30
0.30
0.00
35.00
0.00
4,813
701.21
0.16
0.16
0.00
37.50
0.00
3,680
701.16
0.10
0.10
0.00
40.00
0.00
2,963
701.13
0.06
0.06
0.00
42.50
0.00
2,472
701.11
0.05
0.05
0.00
45.00
0.00
2,116
701.09
0.03
0.03
0.00
47.50
0.00
1,848
701.08
0.03
0.03
0.00
50.00
0.00
1,639
701.07
0.02
0.02
0.00
52.50
0.00
1,471
701.06
0.02
0.02
0.00
55.00
0.00
1,334
701.06
0.01
0.01
0.00
57.50
0.00
1,220
701.05
0.01
0.01
0.00
60.00
0.00
1,124
701.05
0.01
0.01
0.00
62.50
0.00
1,041
701.05
0.01
0.01
0.00
65.00
0.00
970
701.04
0.01
0.01
0.00
67.50
0.00
907
701.04
0.01
0.01
0.00
70.00
0.00
852
701.04
0.01
0.01
0.00
72.50
0.00
804
701.04
0.01
0.01
0.00
75.00
0.00
760
701.03
0.00
0.00
0.00
77.50
0.00
721
701.03
0.00
0.00
0.00
80.00
0.00
686
701.03
0.00
0.00
0.00
82.50
0.00
654
701.03
0.00
0.00
0.00
85.00
0.00
625
701.03
0.00
0.00
0.00
87.50
0.00
598
701.03
0.00
0.00
0.00
90.00
0.00
573
701.03
0.00
0.00
0.00
92.50
0.00
551
701.02
0.00
0.00
0.00
95.00
0.00
530
701.02
0.00
0.00
0.00
97.50
0.00
510
701.02
0.00
0.00
0.00
100.00
0.00
492
701.02
0.00
0.00
0.00
102.50
0.00
475
701.02
0.00
0.00
0.00
105.00
0.00
460
701.02
0.00
0.00
0.00
107.50
0.00
445
701.02
0.00
0.00
0.00
110.00
0.00
431
701.02
0.00
0.00
0.00
112.50
0.00
418
701.02
0.00
0.00
0.00
115.00
0.00
406
701.02
0.00
0.00
0.00
117.50
0.00
394
701.02
0.00
0.00
0.00
120.00
0.00
384
701.02
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 43
Stage -Discharge for Pond 13P: POND 1
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.00
0.00
0.00
0.00
701.10
0.04
0.04
0.00
701.20
0.15
0.15
0.00
701.30
0.33
0.33
0.00
701.40
0.56
0.56
0.00
701.50
0.82
0.82
0.00
701.60
1.11
1.11
0.00
701.70
1.39
1.39
0.00
701.80
1.64
1.64
0.00
701.90
1.83
1.83
0.00
702.00
2.01
2.01
0.00
702.10
2.17
2.17
0.00
702.20
2.32
2.32
0.00
702.30
2.47
2.47
0.00
702.40
2.60
2.60
0.00
702.50
2.73
2.73
0.00
702.60
2.86
2.86
0.00
702.70
2.98
2.98
0.00
702.80
3.09
3.09
0.00
702.90
3.20
3.20
0.00
703.00
3.30
3.30
0.00
703.10
3.41
3.41
0.00
703.20
3.51
3.51
0.00
703.30
3.60
3.60
0.00
703.40
3.70
3.70
0.00
703.50
3.79
3.79
0.00
703.60
3.88
3.88
0.00
703.70
3.97
3.97
0.00
703.80
4.05
4.05
0.00
703.90
4.14
4.14
0.00
704.00
4.22
4.22
0.00
704.10
4.30
4.30
0.00
704.20
4.38
4.38
0.00
704.30
4.46
4.46
0.00
704.40
4.54
4.54
0.00
704.50
4.61
4.61
0.00
704.60
4.69
4.69
0.00
704.70
4.76
4.76
0.00
704.80
4.83
4.83
0.00
704.90
4.90
4.90
0.00
705.00
4.97
4.97
0.00
705.10
5.04
5.04
0.00
705.20
5.11
5.11
0.00
705.30
5.18
5.18
0.00
705.40
5.24
5.24
0.00
705.50
5.31
5.31
0.00
705.60
5.37
5.37
0.00
705.70
5.44
5.44
0.00
705.80
5.50
5.50
0.00
705.90
5.56
5.56
0.00
706.00
5.62
5.62
0.00
706.10
6.60
6.60
0.00
706.20
8.33
8.33
0.00
706.30
10.55
10.55
0.00
706.40
13.17
13.17
0.00
706.50
16.14
16.14
0.00
706.60
19.41
19.41
0.00
706.70
22.78
22.78
0.00
706.80
25.36
25.36
0.00
706.90
27.56
27.56
0.00
707.00
29.54
29.54
0.00
707.10
31.35
31.35
0.00
707.20
33.04
33.04
0.00
707.30
34.63
34.63
0.00
707.40
36.14
36.14
0.00
707.50
37.57
37.57
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
707.60
38.95
38.95
0.00
707.70
40.27
40.27
0.00
707.80
41.55
41.55
0.00
707.90
42.78
42.78
0.00
708.00
43.97
43.97
0.00
708.10
46.79
46.79
0.00
708.20
50.94
50.94
0.00
708.30
55.95
55.95
0.00
708.40
61.66
61.66
0.00
708.50
67.97
67.97
0.00
708.60
75.60
74.81
0.79
708.70
84.36
82.14
2.23
708.80
93.62
89.47
4.15
708.90
96.59
90.11
6.48
709.00
100.05
90.75
9.30
709.10
103.94
91.39
12.55
709.20
107.80
92.02
15.78
709.30
111.90
92.65
19.25
709.40
116.20
93.27
22.92
709.50
120.69
93.89
26.80
709.60
125.48
94.50
30.98
709.70
130.48
95.12
35.36
709.80
135.45
95.72
39.72
709.90
140.55
96.33
44.23
710.00
145.70
96.93
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 44
Stage -Area -Storage for Pond 13P: POND 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.00
22,606
0
701.10
23,399
2,300
701.20
24,191
4,680
701.30
24,984
7,138
701.40
25,776
9,676
701.50
26,569
12,294
701.60
27,362
14,990
701.70
28,154
17,766
701.80
28,947
20,621
701.90
29,739
23,555
702.00
30,532
26,569
702.10
30,812
29,636
702.20
31,092
32,731
702.30
31,373
35,855
702.40
31,653
39,006
702.50
31,933
42,185
702.60
32,213
45,393
702.70
32,493
48,628
702.80
32,774
51,891
702.90
33,054
55,183
703.00
33,334
58,502
703.10
33,638
61,851
703.20
33,943
65,230
703.30
34,247
68,639
703.40
34,552
72,079
703.50
34,856
75,550
703.60
35,160
79,050
703.70
35,465
82,582
703.80
35,769
86,143
703.90
36,074
89,735
704.00
36,378
93,358
704.10
36,713
97,013
704.20
37,049
100,701
704.30
37,384
104,422
704.40
37,720
108,178
704.50
38,055
111,966
704.60
38,390
115,789
704.70
38,726
119,644
704.80
39,061
123,534
704.90
39,397
127,457
705.00
39,732
131,413
705.10
40,158
135,407
705.20
40,583
139,445
705.30
41,009
143,524
705.40
41,434
147,646
705.50
41,860
151,811
705.60
42,286
156,018
705.70
42,711
160,268
705.80
43,137
164,561
705.90
43,562
168,895
706.00
43,988
173,273
706.10
44,508
177,698
706.20
45,028
182,175
706.30
45,548
186,703
706.40
46,068
191,284
706.50
46,588
195,917
706.60
47,107
200,602
706.70
47,627
205,338
706.80
48,147
210,127
706.90
48,667
214,968
707.00
49,187
219,861
707.10
49,750
224,807
707.20
50,313
229,811
707.30
50,876
234,870
707.40
51,439
239,986
707.50
52.003
245.158
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
707.60
52,566
250,386
707.70
53,129
255,671
707.80
53,692
261,012
707.90
54,255
266,409
708.00
54,818
271,863
708.10
55,399
277,374
708.20
55,979
282,943
708.30
56,560
288,570
708.40
57,140
294,255
708.50
57,721
299,998
708.60
58,302
305,799
708.70
58,882
311,658
708.80
59,463
317,575
708.90
60,043
323,551
709.00
60,624
329,584
709.10
61,228
335,677
709.20
61,832
341,830
709.30
62,435
348,043
709.40
63,039
354,317
709.50
63,643
360,651
709.60
64,247
367,045
709.70
64,851
373,500
709.80
65,454
380,015
709.90
66,058
386,591
710.00
66,662
393,227

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 45
Summary for Pond 15P: POND 6
Inflow Area = 13.860 ac, 74.39% Impervious, Inflow Depth = 1.73" for lyr-24hr event
Inflow = 42.36 cfs @ 11.96 hrs, Volume= 1.997 of
Outflow = 2.81 cfs @ 12.62 hrs, Volume= 1.985 af, Atten= 93%, Lag= 40.2 min
Primary = 2.81 cfs @ 12.62 hrs, Volume= 1.985 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 678.56' @ 12.62 hrs Surf.Area= 32,264 sf Storage= 46,575 cf
Plug -Flow detention time= 311.4 min calculated for 1.984 of (99% of inflow)
Center -of -Mass det. time= 309.8 min ( 1,122.2 - 812.4 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
270,951 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
27,493
0 0
678.00
30,495
28,994 28,994
679.00
33,652
32,074 61,068
680.00
36,914
35,283 96,351
681.00
40,232
38,573 134,924
682.00
43,608
41,920 176,844
683.00
47,039
45,324 222,167
684.00
50,528
48,784 270,951
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1
677.00'
10.0" Vert. 8" Orifice C= 0.600
#3 Device 1
680.00'
36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
682.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
682.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=2.81 cfs @ 12.62 hrs HW=678.56' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 2.81 cfs of 21.72 cfs potential flow)
2=8" Orifice (Orifice Controls 2.81 cfs @ 5.15 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD® 10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 46
'0=6 1 gMMR09]kiIIl
.....
IN Inflow
•
•
IN Outflow
• • •
IN Primary
N Secondary
•1
• C I _
1
1
1
i
ii
////////.........
15 10 15 20 25 30 35 41 45 50 55 .1 65 70 75 81 85 91 95 100 105 110 115 120

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 15P: POND 6
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.00
0
677.00
0.00
0.00
0.00
7.50
0.07
119
677.00
0.00
0.00
0.00
10.00
0.47
2,112
677.08
0.02
0.02
0.00
12.50
3.43
46,461
678.56
2.80
2.80
0.00
15.00
1.04
37,366
678.27
2.43
2.43
0.00
17.50
0.67
25,566
677.89
1.80
1.80
0.00
20.00
0.46
17,374
677.61
1.14
1.14
0.00
22.50
0.41
13,120
677.47
0.73
0.73
0.00
25.00
0.00
9,946
677.35
0.45
0.45
0.00
27.50
0.00
7,002
677.25
0.24
0.24
0.00
30.00
0.00
5,348
677.19
0.14
0.14
0.00
32.50
0.00
4,305
677.16
0.09
0.09
0.00
35.00
0.00
3,593
677.13
0.07
0.07
0.00
37.50
0.00
3,078
677.11
0.05
0.05
0.00
40.00
0.00
2,690
677.10
0.04
0.04
0.00
42.50
0.00
2,387
677.09
0.03
0.03
0.00
45.00
0.00
2,144
677.08
0.02
0.02
0.00
47.50
0.00
1,945
677.07
0.02
0.02
0.00
50.00
0.00
1,780
677.06
0.02
0.02
0.00
52.50
0.00
1,640
677.06
0.01
0.01
0.00
55.00
0.00
1,520
677.06
0.01
0.01
0.00
57.50
0.00
1,417
677.05
0.01
0.01
0.00
60.00
0.00
1,326
677.05
0.01
0.01
0.00
62.50
0.00
1,246
677.05
0.01
0.01
0.00
65.00
0.00
1,176
677.04
0.01
0.01
0.00
67.50
0.00
1,112
677.04
0.01
0.01
0.00
70.00
0.00
1,055
677.04
0.01
0.01
0.00
72.50
0.00
1,004
677.04
0.01
0.01
0.00
75.00
0.00
957
677.03
0.00
0.00
0.00
77.50
0.00
915
677.03
0.00
0.00
0.00
80.00
0.00
876
677.03
0.00
0.00
0.00
82.50
0.00
840
677.03
0.00
0.00
0.00
85.00
0.00
807
677.03
0.00
0.00
0.00
87.50
0.00
777
677.03
0.00
0.00
0.00
90.00
0.00
748
677.03
0.00
0.00
0.00
92.50
0.00
722
677.03
0.00
0.00
0.00
95.00
0.00
698
677.03
0.00
0.00
0.00
97.50
0.00
675
677.02
0.00
0.00
0.00
100.00
0.00
653
677.02
0.00
0.00
0.00
102.50
0.00
633
677.02
0.00
0.00
0.00
105.00
0.00
614
677.02
0.00
0.00
0.00
107.50
0.00
596
677.02
0.00
0.00
0.00
110.00
0.00
579
677.02
0.00
0.00
0.00
112.50
0.00
563
677.02
0.00
0.00
0.00
115.00
0.00
548
677.02
0.00
0.00
0.00
117.50
0.00
534
677.02
0.00
0.00
0.00
120.00
0.00
520
677.02
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 48
Stage -Discharge for Pond 15P: POND 6
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.15
0.15
0.00
677.30
0.33
0.33
0.00
677.40
0.56
0.56
0.00
677.50
0.82
0.82
0.00
677.60
1.11
1.11
0.00
677.70
1.39
1.39
0.00
677.80
1.64
1.64
0.00
677.90
1.83
1.83
0.00
678.00
2.01
2.01
0.00
678.10
2.17
2.17
0.00
678.20
2.32
2.32
0.00
678.30
2.47
2.47
0.00
678.40
2.60
2.60
0.00
678.50
2.73
2.73
0.00
678.60
2.86
2.86
0.00
678.70
2.98
2.98
0.00
678.80
3.09
3.09
0.00
678.90
3.20
3.20
0.00
679.00
3.30
3.30
0.00
679.10
3.41
3.41
0.00
679.20
3.51
3.51
0.00
679.30
3.60
3.60
0.00
679.40
3.70
3.70
0.00
679.50
3.79
3.79
0.00
679.60
3.88
3.88
0.00
679.70
3.97
3.97
0.00
679.80
4.05
4.05
0.00
679.90
4.14
4.14
0.00
680.00
4.22
4.22
0.00
680.10
5.22
5.22
0.00
680.20
6.97
6.97
0.00
680.30
9.21
9.21
0.00
680.40
11.84
11.84
0.00
680.50
14.83
14.83
0.00
680.60
18.11
18.11
0.00
680.70
21.50
21.50
0.00
680.80
24.10
24.10
0.00
680.90
26.31
26.31
0.00
681.00
28.30
28.30
0.00
681.10
30.13
30.13
0.00
681.20
31.83
31.83
0.00
681.30
33.44
33.44
0.00
681.40
34.95
34.95
0.00
681.50
36.40
36.40
0.00
681.60
37.79
37.79
0.00
681.70
39.12
39.12
0.00
681.80
40.41
40.41
0.00
681.90
41.65
41.65
0.00
682.00
42.86
42.86
0.00
682.10
45.68
45.68
0.00
682.20
49.84
49.84
0.00
682.30
54.87
54.87
0.00
682.40
60.59
60.59
0.00
682.50
66.90
66.90
0.00
682.60
74.54
73.75
0.79
682.70
76.87
74.64
2.23
682.80
79.57
75.42
4.15
682.90
82.66
76.18
6.48
683.00
86.24
76.94
9.30
683.10
90.23
77.69
12.55
683.20
94.21
78.43
15.78
683.30
98.41
79.16
19.25
683.40
102.82
79.89
22.92
683.50
107.41
80.61
26.80
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
112.31
81.33
30.98
683.70
117.40
82.04
35.36
683.80
122.46
82.74
39.72
683.90
127.67
83.44
44.23
684.00
132.90
84.13
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 49
Stage -Area -Storage for Pond 15P: POND 6
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
27,493
0
677.10
27,793
2,764
677.20
28,093
5,559
677.30
28,394
8,383
677.40
28,694
11,237
677.50
28,994
14,122
677.60
29,294
17,036
677.70
29,594
19,981
677.80
29,895
22,955
677.90
30,195
25,960
678.00
30,495
28,994
678.10
30,811
32,059
678.20
31,126
35,156
678.30
31,442
38,285
678.40
31,758
41,445
678.50
32,074
44,636
678.60
32,389
47,859
678.70
32,705
51,114
678.80
33,021
54,400
678.90
33,336
57,718
679.00
33,652
61,068
679.10
33,978
64,449
679.20
34,304
67,863
679.30
34,631
71,310
679.40
34,957
74,789
679.50
35,283
78,301
679.60
35,609
81,846
679.70
35,935
85,423
679.80
36,262
89,033
679.90
36,588
92,675
680.00
36,914
96,351
680.10
37,246
100,058
680.20
37,578
103,800
680.30
37,909
107,574
680.40
38,241
111,382
680.50
38,573
115,222
680.60
38,905
119,096
680.70
39,237
123,003
680.80
39,568
126,943
680.90
39,900
130,917
681.00
40,232
134,924
681.10
40,570
138,964
681.20
40,907
143,037
681.30
41,245
147,145
681.40
41,582
151,286
681.50
41,920
155,462
681.60
42,258
159,670
681.70
42,595
163,913
681.80
42,933
168,189
681.90
43,270
172,500
682.00
43,608
176,844
682.10
43,951
181,221
682.20
44,294
185,634
682.30
44,637
190,080
682.40
44,980
194,561
682.50
45,324
199,076
682.60
45,667
203,626
682.70
46,010
208,210
682.80
46,353
212,828
682.90
46,696
217,480
683.00
47,039
222,167
683.10
47,388
226,888
683.20
47,737
231,645
683.30
48,086
236,436
683.40
48,435
241,262
683.50
48.784
246.123
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
49,132
251,018
683.70
49,481
255,949
683.80
49,830
260,915
683.90
50,179
265,915
684.00
50,528
270,951

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 50
Summary for Pond 18P: POST - OUTFALL #1
Inflow Area = 48.760 ac, 68.58% Impervious, Inflow Depth = 1.59" for 1yr-24hr event
Inflow = 19.08 cfs @ 11.97 hrs, Volume= 6.454 of
Primary = 19.08 cfs @ 11.97 hrs, Volume= 6.454 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 18P: POST - OUTFALL #1
Hydrograph
-----------------------------------------------------------------
------------------------------------------�--
❑ Inflow
21
--,--r-----r--r-----r-----�----r-----r---r-----�---�--r---r-r �-
❑Primary
20
19.08cfsI
I I I I I I
- - - - ---- - --A0-a
I
19
v -
------
18
--
-+--+-------+--+-------+--+--+----+--+--+-------+--+--+----
17
--
---r---------r---------r--r------7--r---------r--r----
16
--
-i--I -,- -,- ----,I -,-- --- -,I -,----; --,I -,----- ;--,I -,I -,--
- - - - - - - - - -
15
14
--
-+--+-------+--+-------+--+--+----+--+--+-------+--+--+----
13
--
-rt--r--Ir--li----r--Ir--li----r--Ir--Ir- --7--r--li---li--rt--r--Ir--li--
w 12
- l l
11
-1--L--1---'--1--L--1---1--J--1--L--1--- --1--L--1--- '--1--L--+--'--
0
10
--
- --------- --------- -- -- ---- --+--------- -- -- ----
LL 9
--
r--r--i---i--�--r--r--i--�--r--r--i--r--r--r--r--i--�--r--r--i--
7
--
-L------- --L--1---1--J--1--L--1--J--1--L--1-----1--L--L----
6
--
------+--+-------+--+--+----+--+--+-------+--+--+----
5
--
-------r---------r--r - -----7--r---------r--r----
4
-
- - - - - - - - - - -
--
--- -------- --------- --------- --------- - ---
2
1
0
0 5
10
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 51
Hydrograph for Pond 18P: POST - OUTFALL #1
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.00
0.00
8.00
0.03
0.03
9.00
0.14
0.14
10.00
0.41
0.41
11.00
1.07
1.07
12.00
18.34
18.34
13.00
6.20
6.20
14.00
5.78
5.78
15.00
5.55
5.55
16.00
5.28
5.28
17.00
5.06
5.06
18.00
4.82
4.82
19.00
4.56
4.56
20.00
4.29
4.29
21.00
4.03
4.03
22.00
3.78
3.78
23.00
3.53
3.53
24.00
3.27
3.27
25.00
2.67
2.67
26.00
2.28
2.28
27.00
1.87
1.87
28.00
1.45
1.45
29.00
1.00
1.00
30.00
0.68
0.68
31.00
0.48
0.48
32.00
0.35
0.35
33.00
0.26
0.26
34.00
0.20
0.20
35.00
0.16
0.16
36.00
0.13
0.13
37.00
0.11
0.11
38.00
0.09
0.09
39.00
0.08
0.08
40.00
0.06
0.06
41.00
0.06
0.06
42.00
0.05
0.05
43.00
0.04
0.04
44.00
0.04
0.04
45.00
0.03
0.03
46.00
0.03
0.03
47.00
0.03
0.03
48.00
0.02
0.02
49.00
0.02
0.02
50.00
0.02
0.02
51.00
0.02
0.02
52.00
0.02
0.02
53.00
0.02
0.02
54.00
0.01
0.01
55.00
0.01
0.01
56.00
0.01
0.01
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.00
0.00
74.00
0.00
0.00
75.00
0.00
0.00
76.00
0.00
0.00
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 52
Summary for Pond 21 P: POST - OUTFALL #3
Inflow Area = 17.630 ac, 58.48% Impervious, Inflow Depth > 1.40" for 1yr-24hr event
Inflow = 3.15 cfs @ 12.28 hrs, Volume= 2.061 of
Primary = 3.15 cfs @ 12.28 hrs, Volume= 2.061 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 21 P: POST - OUTFALL #3
Hydrograph
❑ Inflow
❑ Primary
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 53
Hydrograph for Pond 21 P: POST - OUTFALL #3
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.00
0.00
8.00
0.00
0.00
9.00
0.00
0.00
10.00
0.02
0.02
11.00
0.11
0.11
12.00
2.42
2.42
13.00
2.95
2.95
14.00
2.74
2.74
15.00
2.51
2.51
16.00
2.25
2.25
17.00
1.99
1.99
18.00
1.73
1.73
19.00
1.46
1.46
20.00
1.18
1.18
21.00
0.97
0.97
22.00
0.82
0.82
23.00
0.72
0.72
24.00
0.64
0.64
25.00
0.45
0.45
26.00
0.34
0.34
27.00
0.27
0.27
28.00
0.21
0.21
29.00
0.17
0.17
30.00
0.14
0.14
31.00
0.12
0.12
32.00
0.10
0.10
33.00
0.09
0.09
34.00
0.08
0.08
35.00
0.07
0.07
36.00
0.06
0.06
37.00
0.05
0.05
38.00
0.05
0.05
39.00
0.04
0.04
40.00
0.04
0.04
41.00
0.03
0.03
42.00
0.03
0.03
43.00
0.03
0.03
44.00
0.03
0.03
45.00
0.02
0.02
46.00
0.02
0.02
47.00
0.02
0.02
48.00
0.02
0.02
49.00
0.02
0.02
50.00
0.02
0.02
51.00
0.02
0.02
52.00
0.01
0.01
53.00
0.01
0.01
54.00
0.01
0.01
55.00
0.01
0.01
56.00
0.01
0.01
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.01
0.01
75.00
0.00
0.00
76.00
0.00
0.00
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
2-YEAR, 24-HOUR STORM EVENT

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Summary for Subcatchment 3S: POST TO POND 2
Runoff = 75.44 cfs @ 11.95 hrs, Volume= 3.576 af, Depth= 2.17"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN
Description
14.690 98
Impervious
5.100 61
>75% Grass cover, Good, HSG B
19.790 88
Weighted Average
5.100
25.77% Pervious Area
14.690
74.23% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 3S: POST TO POND 2
Hydrograph
-
------------r--r--r---- - -------r-- r--r-- r--r--I - - -
-- ----r--r--r-- ■Runoff
80 75.44 Cfs �--I--�' I- -------- -- -- -- -- --------- -- -- -- -- --
75 _ _ _ _ r _ _ _ _ _ _ r r _
- - - - - - - - - - - - Type-N 2 -fa� -
70
-- -- r--r--r----------r--r-Zyrr2 Cir-Rainfall-4139'-
65
60 ' --'-- --'- - -- -------------- - -Ruhoff Ar6a:�79-790at
55
^ --r- --i--r--r--r--r--r--i---i--r--r--r--r--r--r--r--i--r--r--r--r--r--
45 ' - 1--L-- J--1--1----Ru-noff Depth:�2.1717
..
40 ---- ---- -- -- ------------ -- -- -- -------
LL 35
-i T - 1 i-' iQf�
--r--
---r--r--r--r--r--r----r--r--r--r--r--r--r----r--r-IY 8�B 30
---- ---- --+-- ------------ -- -- -- -- --------------- -- --
25
20
15
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Hydrograph for Subcatchment 3S: POST TO POND 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.11
8.00
0.41
0.01
0.24
9.00
0.50
0.03
0.54
10.00
0.61
0.07
0.92
11.00
0.80
0.15
2.18
12.00
2.25
1.17
64.78
13.00
2.62
1.48
3.80
14.00
2.78
1.62
2.28
15.00
2.89
1.72
1.82
16.00
2.98
1.80
1.41
17.00
3.06
1.87
1.25
18.00
3.12
1.93
1.10
19.00
3.18
1.98
0.95
20.00
3.23
2.02
0.80
21.00
3.27
2.06
0.77
22.00
3.31
2.10
0.74
23.00
3.35
2.13
0.71
24.00
3.39
2.17
0.68
25.00
3.39
2.17
0.00
26.00
3.39
2.17
0.00
27.00
3.39
2.17
0.00
28.00
3.39
2.17
0.00
29.00
3.39
2.17
0.00
30.00
3.39
2.17
0.00
31.00
3.39
2.17
0.00
32.00
3.39
2.17
0.00
33.00
3.39
2.17
0.00
34.00
3.39
2.17
0.00
35.00
3.39
2.17
0.00
36.00
3.39
2.17
0.00
37.00
3.39
2.17
0.00
38.00
3.39
2.17
0.00
39.00
3.39
2.17
0.00
40.00
3.39
2.17
0.00
41.00
3.39
2.17
0.00
42.00
3.39
2.17
0.00
43.00
3.39
2.17
0.00
44.00
3.39
2.17
0.00
45.00
3.39
2.17
0.00
46.00
3.39
2.17
0.00
47.00
3.39
2.17
0.00
48.00
3.39
2.17
0.00
49.00
3.39
2.17
0.00
50.00
3.39
2.17
0.00
51.00
3.39
2.17
0.00
52.00
3.39
2.17
0.00
53.00
3.39
2.17
0.00
54.00
3.39
2.17
0.00
55.00
3.39
2.17
0.00
56.00
3.39
2.17
0.00
57.00
3.39
2.17
0.00
58.00
3.39
2.17
0.00
59.00
3.39
2.17
0.00
60.00
3.39
2.17
0.00
61.00
3.39
2.17
0.00
62.00
3.39
2.17
0.00
63.00
3.39
2.17
0.00
64.00
3.39
2.17
0.00
65.00
3.39
2.17
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.17
0.00
67.00
3.39
2.17
0.00
68.00
3.39
2.17
0.00
69.00
3.39
2.17
0.00
70.00
3.39
2.17
0.00
71.00
3.39
2.17
0.00
72.00
3.39
2.17
0.00
73.00
3.39
2.17
0.00
74.00
3.39
2.17
0.00
75.00
3.39
2.17
0.00
76.00
3.39
2.17
0.00
77.00
3.39
2.17
0.00
78.00
3.39
2.17
0.00
79.00
3.39
2.17
0.00
80.00
3.39
2.17
0.00
81.00
3.39
2.17
0.00
82.00
3.39
2.17
0.00
83.00
3.39
2.17
0.00
84.00
3.39
2.17
0.00
85.00
3.39
2.17
0.00
86.00
3.39
2.17
0.00
87.00
3.39
2.17
0.00
88.00
3.39
2.17
0.00
89.00
3.39
2.17
0.00
90.00
3.39
2.17
0.00
91.00
3.39
2.17
0.00
92.00
3.39
2.17
0.00
93.00
3.39
2.17
0.00
94.00
3.39
2.17
0.00
95.00
3.39
2.17
0.00
96.00
3.39
2.17
0.00
97.00
3.39
2.17
0.00
98.00
3.39
2.17
0.00
99.00
3.39
2.17
0.00
100.00
3.39
2.17
0.00
101.00
3.39
2.17
0.00
102.00
3.39
2.17
0.00
103.00
3.39
2.17
0.00
104.00
3.39
2.17
0.00
105.00
3.39
2.17
0.00
106.00
3.39
2.17
0.00
107.00
3.39
2.17
0.00
108.00
3.39
2.17
0.00
109.00
3.39
2.17
0.00
110.00
3.39
2.17
0.00
111.00
3.39
2.17
0.00
112.00
3.39
2.17
0.00
113.00
3.39
2.17
0.00
114.00
3.39
2.17
0.00
115.00
3.39
2.17
0.00
116.00
3.39
2.17
0.00
117.00
3.39
2.17
0.00
118.00
3.39
2.17
0.00
119.00
3.39
2.17
0.00
120.00
3.39
2.17
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 3
Summary for Subcatchment 4S: PRE (OUTFALL #1)
Runoff = 47.44 cfs @ 12.16 hrs, Volume= 3.976 af, Depth= 1.11"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
9.130 55 Woods, Good, HSG B
34.000 78 Row crops, straight row, Good, HSG B
43.130 73 Weighted Average
43.130 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 4S: PRE (OUTFALL #1)
Hydrograph
----------+--+--+--+--+----+--+--+--+--+--+--+--+-+--+--+--+--+--+-- ■Runoff
50 47.44 Cfs
45-,--,--+--------,---,---,----- ----------------T-YIYQ-HTZ -h1r-
40
-- -- ----'+--' -- -- -RuhoffAr6a=4a.-0I-at-
35 -- -- --+-- -- - - -- -- -- nQ##I-V�I me-=1$7$ T Of -
w 30
-- -- - - - -- -- --'+--Runoff'DupthT1.'+1-1"_
° 25 FlOW Ldn-0th=1062'--
-------+--+- ------,--+- -----------+-----
15 OW-7 3
10
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Hydrograph for Subcatchment 4S: PRE (OUTFALL #1)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.02
12.00
2.25
0.44
24.97
13.00
2.62
0.63
6.78
14.00
2.78
0.73
3.74
15.00
2.89
0.79
2.84
16.00
2.98
0.85
2.28
17.00
3.06
0.89
1.95
18.00
3.12
0.93
1.74
19.00
3.18
0.97
1.53
20.00
3.23
1.00
1.31
21.00
3.27
1.03
1.21
22.00
3.31
1.06
1.17
23.00
3.35
1.08
1.13
24.00
3.39
1.11
1.09
25.00
3.39
1.11
0.00
26.00
3.39
1.11
0.00
27.00
3.39
1.11
0.00
28.00
3.39
1.11
0.00
29.00
3.39
1.11
0.00
30.00
3.39
1.11
0.00
31.00
3.39
1.11
0.00
32.00
3.39
1.11
0.00
33.00
3.39
1.11
0.00
34.00
3.39
1.11
0.00
35.00
3.39
1.11
0.00
36.00
3.39
1.11
0.00
37.00
3.39
1.11
0.00
38.00
3.39
1.11
0.00
39.00
3.39
1.11
0.00
40.00
3.39
1.11
0.00
41.00
3.39
1.11
0.00
42.00
3.39
1.11
0.00
43.00
3.39
1.11
0.00
44.00
3.39
1.11
0.00
45.00
3.39
1.11
0.00
46.00
3.39
1.11
0.00
47.00
3.39
1.11
0.00
48.00
3.39
1.11
0.00
49.00
3.39
1.11
0.00
50.00
3.39
1.11
0.00
51.00
3.39
1.11
0.00
52.00
3.39
1.11
0.00
53.00
3.39
1.11
0.00
54.00
3.39
1.11
0.00
55.00
3.39
1.11
0.00
56.00
3.39
1.11
0.00
57.00
3.39
1.11
0.00
58.00
3.39
1.11
0.00
59.00
3.39
1.11
0.00
60.00
3.39
1.11
0.00
61.00
3.39
1.11
0.00
62.00
3.39
1.11
0.00
63.00
3.39
1.11
0.00
64.00
3.39
1.11
0.00
65.00
3.39
1.11
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
1.11
0.00
67.00
3.39
1.11
0.00
68.00
3.39
1.11
0.00
69.00
3.39
1.11
0.00
70.00
3.39
1.11
0.00
71.00
3.39
1.11
0.00
72.00
3.39
1.11
0.00
73.00
3.39
1.11
0.00
74.00
3.39
1.11
0.00
75.00
3.39
1.11
0.00
76.00
3.39
1.11
0.00
77.00
3.39
1.11
0.00
78.00
3.39
1.11
0.00
79.00
3.39
1.11
0.00
80.00
3.39
1.11
0.00
81.00
3.39
1.11
0.00
82.00
3.39
1.11
0.00
83.00
3.39
1.11
0.00
84.00
3.39
1.11
0.00
85.00
3.39
1.11
0.00
86.00
3.39
1.11
0.00
87.00
3.39
1.11
0.00
88.00
3.39
1.11
0.00
89.00
3.39
1.11
0.00
90.00
3.39
1.11
0.00
91.00
3.39
1.11
0.00
92.00
3.39
1.11
0.00
93.00
3.39
1.11
0.00
94.00
3.39
1.11
0.00
95.00
3.39
1.11
0.00
96.00
3.39
1.11
0.00
97.00
3.39
1.11
0.00
98.00
3.39
1.11
0.00
99.00
3.39
1.11
0.00
100.00
3.39
1.11
0.00
101.00
3.39
1.11
0.00
102.00
3.39
1.11
0.00
103.00
3.39
1.11
0.00
104.00
3.39
1.11
0.00
105.00
3.39
1.11
0.00
106.00
3.39
1.11
0.00
107.00
3.39
1.11
0.00
108.00
3.39
1.11
0.00
109.00
3.39
1.11
0.00
110.00
3.39
1.11
0.00
111.00
3.39
1.11
0.00
112.00
3.39
1.11
0.00
113.00
3.39
1.11
0.00
114.00
3.39
1.11
0.00
115.00
3.39
1.11
0.00
116.00
3.39
1.11
0.00
117.00
3.39
1.11
0.00
118.00
3.39
1.11
0.00
119.00
3.39
1.11
0.00
120.00
3.39
1.11
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Summary for Subcatchment 5S: PRE (OUTFALL #2)
Runoff = 67.67 cfs @ 12.16 hrs, Volume= 5.615 af, Depth= 1.16"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
10.200 55 Woods, Good, HSG B
47.660 78 Row crops, straight row, Good, HSG B
57.860 74 Weighted Average
57.860 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 5S: PRE (OUTFALL #2)
Hydrograph
75 ■Runoff
70
67.67 cfs -1 T --T ------------ ----T--T--r--r--I------1 -1 T --T--F
----
65 yM p_ r
--r- -i--r--r--r--r--r--r--i--r--r--r--r--r--r--r--i--r--r--r--r--r--
60------------------'___2vrr24hrRai_nfaIIT3.39
55 RLthoff Ar6ay67.864 -at
50 s�1/�
-- - 1 Mnpff-Vol r1 a=5-00 '—T- -
45
------------------4--r--�--I---I----------�--
w Runoff DepthT1.�16�"
---T--T--T--T--�-------T--T--T-- T--r-------�--T-T--T--T--T -
-
LL 35 Flb -Lin t = �1-62'--
-- - 1--L-----1---1-- 1--1-- -- -
30 T Q
--r----r--r--r--r--r--r----r--r--r--r--r--r--r--i 1 q=�I iJ min--
25
20 N=74 -
15
10
5 I I I 1 I I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Hydrograph for Subcatchment 5S: PRE (OUTFALL #2)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.18
12.00
2.25
0.47
36.41
13.00
2.62
0.68
9.45
14.00
2.78
0.77
5.20
15.00
2.89
0.84
3.94
16.00
2.98
0.90
3.15
17.00
3.06
0.94
2.70
18.00
3.12
0.99
2.41
19.00
3.18
1.02
2.11
20.00
3.23
1.06
1.81
21.00
3.27
1.08
1.67
22.00
3.31
1.11
1.61
23.00
3.35
1.14
1.55
24.00
3.39
1.16
1.50
25.00
3.39
1.16
0.01
26.00
3.39
1.16
0.00
27.00
3.39
1.16
0.00
28.00
3.39
1.16
0.00
29.00
3.39
1.16
0.00
30.00
3.39
1.16
0.00
31.00
3.39
1.16
0.00
32.00
3.39
1.16
0.00
33.00
3.39
1.16
0.00
34.00
3.39
1.16
0.00
35.00
3.39
1.16
0.00
36.00
3.39
1.16
0.00
37.00
3.39
1.16
0.00
38.00
3.39
1.16
0.00
39.00
3.39
1.16
0.00
40.00
3.39
1.16
0.00
41.00
3.39
1.16
0.00
42.00
3.39
1.16
0.00
43.00
3.39
1.16
0.00
44.00
3.39
1.16
0.00
45.00
3.39
1.16
0.00
46.00
3.39
1.16
0.00
47.00
3.39
1.16
0.00
48.00
3.39
1.16
0.00
49.00
3.39
1.16
0.00
50.00
3.39
1.16
0.00
51.00
3.39
1.16
0.00
52.00
3.39
1.16
0.00
53.00
3.39
1.16
0.00
54.00
3.39
1.16
0.00
55.00
3.39
1.16
0.00
56.00
3.39
1.16
0.00
57.00
3.39
1.16
0.00
58.00
3.39
1.16
0.00
59.00
3.39
1.16
0.00
60.00
3.39
1.16
0.00
61.00
3.39
1.16
0.00
62.00
3.39
1.16
0.00
63.00
3.39
1.16
0.00
64.00
3.39
1.16
0.00
65.00
3.39
1.16
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
1.16
0.00
67.00
3.39
1.16
0.00
68.00
3.39
1.16
0.00
69.00
3.39
1.16
0.00
70.00
3.39
1.16
0.00
71.00
3.39
1.16
0.00
72.00
3.39
1.16
0.00
73.00
3.39
1.16
0.00
74.00
3.39
1.16
0.00
75.00
3.39
1.16
0.00
76.00
3.39
1.16
0.00
77.00
3.39
1.16
0.00
78.00
3.39
1.16
0.00
79.00
3.39
1.16
0.00
80.00
3.39
1.16
0.00
81.00
3.39
1.16
0.00
82.00
3.39
1.16
0.00
83.00
3.39
1.16
0.00
84.00
3.39
1.16
0.00
85.00
3.39
1.16
0.00
86.00
3.39
1.16
0.00
87.00
3.39
1.16
0.00
88.00
3.39
1.16
0.00
89.00
3.39
1.16
0.00
90.00
3.39
1.16
0.00
91.00
3.39
1.16
0.00
92.00
3.39
1.16
0.00
93.00
3.39
1.16
0.00
94.00
3.39
1.16
0.00
95.00
3.39
1.16
0.00
96.00
3.39
1.16
0.00
97.00
3.39
1.16
0.00
98.00
3.39
1.16
0.00
99.00
3.39
1.16
0.00
100.00
3.39
1.16
0.00
101.00
3.39
1.16
0.00
102.00
3.39
1.16
0.00
103.00
3.39
1.16
0.00
104.00
3.39
1.16
0.00
105.00
3.39
1.16
0.00
106.00
3.39
1.16
0.00
107.00
3.39
1.16
0.00
108.00
3.39
1.16
0.00
109.00
3.39
1.16
0.00
110.00
3.39
1.16
0.00
111.00
3.39
1.16
0.00
112.00
3.39
1.16
0.00
113.00
3.39
1.16
0.00
114.00
3.39
1.16
0.00
115.00
3.39
1.16
0.00
116.00
3.39
1.16
0.00
117.00
3.39
1.16
0.00
118.00
3.39
1.16
0.00
119.00
3.39
1.16
0.00
120.00
3.39
1.16
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 7
Summary for Subcatchment 6S: PRE (OUTFALL #3)
Runoff = 16.42 cfs @ 12.16 hrs, Volume= 1.376 af, Depth= 1.11"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
3.190 55 Woods, Good, HSG B
11.740 78 Row crops, straight row, Good, HSG B
14.930 73 Weighted Average
14.930 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 6S: PRE (OUTFALL #3)
Hydrograph
18 ■Runoff
17
16.42 cfs--T --T --------------T-- T-- T - -T -----------T--T--T --
T--
16 --i-- ti--y--+--r--r--r---------rt--rt--+--r--r--i---i
15 --'�-- --- -- -- ------------ -- -- -2,yrr24htRainfafha.391`-
14-
Runnff �r�ay 1 #-.9�3II arc -
13 --'-- -'---L--L----1---1---1--J--1--L- r
1 1 1 1
12- -- -- -- -- - -- --1 unpff'-Vplurn,e=1.$7$- 1-
11
---- -------------------------------------------------------------
,o - _-Roma#'Depth1:'71"-
3 g
--'i-- -'i----T--r--r--T-----i-- -- -- --r-- - - - - r-
o ,
- _ F16W L6n�th=1_ 1-62 - -
8 - --
7 - -- - -- -- -- --------I-- -- -- -- --r--'-----I��,'g-f-
s--------+------��-------------+----��-------T--�------�--
4N=73
4 --'-- -'----1--L--L--1---1---1--J--1--L--L--L--L-------L--L--L--L--L--
3
2
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 8
Hydrograph for Subcatchment 6S: PRE (OUTFALL #3)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.01
12.00
2.25
0.44
8.64
13.00
2.62
0.63
2.35
14.00
2.78
0.73
1.29
15.00
2.89
0.79
0.98
16.00
2.98
0.85
0.79
17.00
3.06
0.89
0.67
18.00
3.12
0.93
0.60
19.00
3.18
0.97
0.53
20.00
3.23
1.00
0.45
21.00
3.27
1.03
0.42
22.00
3.31
1.06
0.40
23.00
3.35
1.08
0.39
24.00
3.39
1.11
0.38
25.00
3.39
1.11
0.00
26.00
3.39
1.11
0.00
27.00
3.39
1.11
0.00
28.00
3.39
1.11
0.00
29.00
3.39
1.11
0.00
30.00
3.39
1.11
0.00
31.00
3.39
1.11
0.00
32.00
3.39
1.11
0.00
33.00
3.39
1.11
0.00
34.00
3.39
1.11
0.00
35.00
3.39
1.11
0.00
36.00
3.39
1.11
0.00
37.00
3.39
1.11
0.00
38.00
3.39
1.11
0.00
39.00
3.39
1.11
0.00
40.00
3.39
1.11
0.00
41.00
3.39
1.11
0.00
42.00
3.39
1.11
0.00
43.00
3.39
1.11
0.00
44.00
3.39
1.11
0.00
45.00
3.39
1.11
0.00
46.00
3.39
1.11
0.00
47.00
3.39
1.11
0.00
48.00
3.39
1.11
0.00
49.00
3.39
1.11
0.00
50.00
3.39
1.11
0.00
51.00
3.39
1.11
0.00
52.00
3.39
1.11
0.00
53.00
3.39
1.11
0.00
54.00
3.39
1.11
0.00
55.00
3.39
1.11
0.00
56.00
3.39
1.11
0.00
57.00
3.39
1.11
0.00
58.00
3.39
1.11
0.00
59.00
3.39
1.11
0.00
60.00
3.39
1.11
0.00
61.00
3.39
1.11
0.00
62.00
3.39
1.11
0.00
63.00
3.39
1.11
0.00
64.00
3.39
1.11
0.00
65.00
3.39
1.11
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
1.11
0.00
67.00
3.39
1.11
0.00
68.00
3.39
1.11
0.00
69.00
3.39
1.11
0.00
70.00
3.39
1.11
0.00
71.00
3.39
1.11
0.00
72.00
3.39
1.11
0.00
73.00
3.39
1.11
0.00
74.00
3.39
1.11
0.00
75.00
3.39
1.11
0.00
76.00
3.39
1.11
0.00
77.00
3.39
1.11
0.00
78.00
3.39
1.11
0.00
79.00
3.39
1.11
0.00
80.00
3.39
1.11
0.00
81.00
3.39
1.11
0.00
82.00
3.39
1.11
0.00
83.00
3.39
1.11
0.00
84.00
3.39
1.11
0.00
85.00
3.39
1.11
0.00
86.00
3.39
1.11
0.00
87.00
3.39
1.11
0.00
88.00
3.39
1.11
0.00
89.00
3.39
1.11
0.00
90.00
3.39
1.11
0.00
91.00
3.39
1.11
0.00
92.00
3.39
1.11
0.00
93.00
3.39
1.11
0.00
94.00
3.39
1.11
0.00
95.00
3.39
1.11
0.00
96.00
3.39
1.11
0.00
97.00
3.39
1.11
0.00
98.00
3.39
1.11
0.00
99.00
3.39
1.11
0.00
100.00
3.39
1.11
0.00
101.00
3.39
1.11
0.00
102.00
3.39
1.11
0.00
103.00
3.39
1.11
0.00
104.00
3.39
1.11
0.00
105.00
3.39
1.11
0.00
106.00
3.39
1.11
0.00
107.00
3.39
1.11
0.00
108.00
3.39
1.11
0.00
109.00
3.39
1.11
0.00
110.00
3.39
1.11
0.00
111.00
3.39
1.11
0.00
112.00
3.39
1.11
0.00
113.00
3.39
1.11
0.00
114.00
3.39
1.11
0.00
115.00
3.39
1.11
0.00
116.00
3.39
1.11
0.00
117.00
3.39
1.11
0.00
118.00
3.39
1.11
0.00
119.00
3.39
1.11
0.00
120.00
3.39
1.11
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 9
Summary for Subcatchment 7S: POST TO POND 3
Runoff = 58.17 cfs @ 11.95 hrs, Volume= 2.758 af, Depth= 2.17"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN
Description
11.010 98
Impervious
4.250 61
>75% Grass cover, Good, HSG B
15.260 88
Weighted Average
4.250
27.85% Pervious Area
11.010
72.15% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 7S: POST TO POND 3
Hydrograph
65 Runoff
58.17 cfs-----r--r-------------------t--r--
r---------,--rt--r--r-
60I I I
-I------,--7--r--r--------I--1--7--7--T--r--r--I---ITy1_N=hr -
55
-- --
so T--T --T- ------'I----T--T-4rr2�hr-RainfalrT3.39'F-
I I I I I I I I I I I I
---- - -
--I-- T --r --T T--T-Ruhoff Aroa=16.260 ad -
45
--r-
---- -- -- ------------ -- -- --T -- --------- -- -- -- -- --
40 �R0 n Offl Vp 14 m�Ie=2. 5 Calf
--I--
35 Runoff IDcpthT2.1171" .... I I
LL 3o Tc"5.0 M i n
--I -- --I-- --I - -
25
I I
20
---------- --r--i--------------- --r--i--------------- --r--i --
15
10
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Hydrograph for Subcatchment 7S: POST TO POND 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.08
8.00
0.41
0.01
0.19
9.00
0.50
0.03
0.42
10.00
0.61
0.07
0.71
11.00
0.80
0.15
1.68
12.00
2.25
1.17
49.95
13.00
2.62
1.48
2.93
14.00
2.78
1.62
1.76
15.00
2.89
1.72
1.41
16.00
2.98
1.80
1.09
17.00
3.06
1.87
0.96
18.00
3.12
1.93
0.85
19.00
3.18
1.98
0.73
20.00
3.23
2.02
0.62
21.00
3.27
2.06
0.59
22.00
3.31
2.10
0.57
23.00
3.35
2.13
0.55
24.00
3.39
2.17
0.52
25.00
3.39
2.17
0.00
26.00
3.39
2.17
0.00
27.00
3.39
2.17
0.00
28.00
3.39
2.17
0.00
29.00
3.39
2.17
0.00
30.00
3.39
2.17
0.00
31.00
3.39
2.17
0.00
32.00
3.39
2.17
0.00
33.00
3.39
2.17
0.00
34.00
3.39
2.17
0.00
35.00
3.39
2.17
0.00
36.00
3.39
2.17
0.00
37.00
3.39
2.17
0.00
38.00
3.39
2.17
0.00
39.00
3.39
2.17
0.00
40.00
3.39
2.17
0.00
41.00
3.39
2.17
0.00
42.00
3.39
2.17
0.00
43.00
3.39
2.17
0.00
44.00
3.39
2.17
0.00
45.00
3.39
2.17
0.00
46.00
3.39
2.17
0.00
47.00
3.39
2.17
0.00
48.00
3.39
2.17
0.00
49.00
3.39
2.17
0.00
50.00
3.39
2.17
0.00
51.00
3.39
2.17
0.00
52.00
3.39
2.17
0.00
53.00
3.39
2.17
0.00
54.00
3.39
2.17
0.00
55.00
3.39
2.17
0.00
56.00
3.39
2.17
0.00
57.00
3.39
2.17
0.00
58.00
3.39
2.17
0.00
59.00
3.39
2.17
0.00
60.00
3.39
2.17
0.00
61.00
3.39
2.17
0.00
62.00
3.39
2.17
0.00
63.00
3.39
2.17
0.00
64.00
3.39
2.17
0.00
65.00
3.39
2.17
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.17
0.00
67.00
3.39
2.17
0.00
68.00
3.39
2.17
0.00
69.00
3.39
2.17
0.00
70.00
3.39
2.17
0.00
71.00
3.39
2.17
0.00
72.00
3.39
2.17
0.00
73.00
3.39
2.17
0.00
74.00
3.39
2.17
0.00
75.00
3.39
2.17
0.00
76.00
3.39
2.17
0.00
77.00
3.39
2.17
0.00
78.00
3.39
2.17
0.00
79.00
3.39
2.17
0.00
80.00
3.39
2.17
0.00
81.00
3.39
2.17
0.00
82.00
3.39
2.17
0.00
83.00
3.39
2.17
0.00
84.00
3.39
2.17
0.00
85.00
3.39
2.17
0.00
86.00
3.39
2.17
0.00
87.00
3.39
2.17
0.00
88.00
3.39
2.17
0.00
89.00
3.39
2.17
0.00
90.00
3.39
2.17
0.00
91.00
3.39
2.17
0.00
92.00
3.39
2.17
0.00
93.00
3.39
2.17
0.00
94.00
3.39
2.17
0.00
95.00
3.39
2.17
0.00
96.00
3.39
2.17
0.00
97.00
3.39
2.17
0.00
98.00
3.39
2.17
0.00
99.00
3.39
2.17
0.00
100.00
3.39
2.17
0.00
101.00
3.39
2.17
0.00
102.00
3.39
2.17
0.00
103.00
3.39
2.17
0.00
104.00
3.39
2.17
0.00
105.00
3.39
2.17
0.00
106.00
3.39
2.17
0.00
107.00
3.39
2.17
0.00
108.00
3.39
2.17
0.00
109.00
3.39
2.17
0.00
110.00
3.39
2.17
0.00
111.00
3.39
2.17
0.00
112.00
3.39
2.17
0.00
113.00
3.39
2.17
0.00
114.00
3.39
2.17
0.00
115.00
3.39
2.17
0.00
116.00
3.39
2.17
0.00
117.00
3.39
2.17
0.00
118.00
3.39
2.17
0.00
119.00
3.39
2.17
0.00
120.00
3.39
2.17
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 11
Summary for Subcatchment 9S: POST TO POND 4
Runoff = 38.86 cfs @ 11.96 hrs, Volume= 1.832 af, Depth= 2.08"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
7.330 98 Impervious
3.220 61 >75% Grass cover, Good, HSG B
10.550 87 Weighted Average
3.220 30.52% Pervious Area
7.330 69.48% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 9S: POST TO POND 4
Hydrograph
42+--+--+--r--r--i---i--�--�--�--+--r--r--r--i--+--�--+--r--+-- � Runoff
3886 cfs
40 .
--,------- - - - - ---------------- - - - -
----,----
38 --��-- ---- -- -- �� --�� --��---------- -- -- �� --�� --��----- �,TY;�le424-fa� -
36 --'-- --'----1--L--L--1---1---'--------L--L--L--1---1--J----1--L--r--
2,Yrr24h-r Rainfalt;;3.391,
32 --Ir- --li----7--r--r--Ir--Ir--li-- -- -- -
30 - - -- -- -- - - -- -- _Ruioff-►ra�.v51 at -
28 ---- ---- -- -- --------------- -
26 --'-- --'----1--L------------J--1--1p1O*e=1: 3 -
24 - -- ----+--+-- -- -- ----+--Rtmoff�DethT2.8..
22 --I------T-- T--r - -r - -I---------T--T--r--r--r--1---1--Tr �/+T-T--.r�,-,-F--
LL 20 --i-- --1 I -- I --i--------I -- -- -- I--i---i-- 1 \iT - lillfh--
I I I I I I I I I
18 ---- ---- -- -- --------------- -- --i
16
N=8
14 --r-----y--+--r--r--r-------y--rt--rt--+--r--r--r----y----+--r--r--
12
�--T-- T-- r - -r--r --i---i--T--T--T--r--r--r--r--i--T--T--T--r--r--
10 --i - -i---- --i --i-----i---- --i --i-----i-- --i
--'-- -1--1--1--L--L--1---1---1--J--1--1--L--L--L--1---1--J--1--1--L--r--
6 --i-- -i-- --+-- ----------i-- -- -- -- -- -------i-- -- --+-- -- --
4 --r----r--r--r--r--r--r----r--r--r--r--r--r--r----r--r--r--r--r--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 12
Hydrograph for Subcatchment 9S: POST TO POND 4
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.03
8.00
0.41
0.01
0.10
9.00
0.50
0.02
0.24
10.00
0.61
0.05
0.43
11.00
0.80
0.12
1.06
12.00
2.25
1.10
33.49
13.00
2.62
1.41
1.98
14.00
2.78
1.55
1.19
15.00
2.89
1.65
0.95
16.00
2.98
1.72
0.74
17.00
3.06
1.79
0.65
18.00
3.12
1.85
0.58
19.00
3.18
1.90
0.50
20.00
3.23
1.94
0.42
21.00
3.27
1.98
0.40
22.00
3.31
2.01
0.39
23.00
3.35
2.05
0.37
24.00
3.39
2.08
0.35
25.00
3.39
2.08
0.00
26.00
3.39
2.08
0.00
27.00
3.39
2.08
0.00
28.00
3.39
2.08
0.00
29.00
3.39
2.08
0.00
30.00
3.39
2.08
0.00
31.00
3.39
2.08
0.00
32.00
3.39
2.08
0.00
33.00
3.39
2.08
0.00
34.00
3.39
2.08
0.00
35.00
3.39
2.08
0.00
36.00
3.39
2.08
0.00
37.00
3.39
2.08
0.00
38.00
3.39
2.08
0.00
39.00
3.39
2.08
0.00
40.00
3.39
2.08
0.00
41.00
3.39
2.08
0.00
42.00
3.39
2.08
0.00
43.00
3.39
2.08
0.00
44.00
3.39
2.08
0.00
45.00
3.39
2.08
0.00
46.00
3.39
2.08
0.00
47.00
3.39
2.08
0.00
48.00
3.39
2.08
0.00
49.00
3.39
2.08
0.00
50.00
3.39
2.08
0.00
51.00
3.39
2.08
0.00
52.00
3.39
2.08
0.00
53.00
3.39
2.08
0.00
54.00
3.39
2.08
0.00
55.00
3.39
2.08
0.00
56.00
3.39
2.08
0.00
57.00
3.39
2.08
0.00
58.00
3.39
2.08
0.00
59.00
3.39
2.08
0.00
60.00
3.39
2.08
0.00
61.00
3.39
2.08
0.00
62.00
3.39
2.08
0.00
63.00
3.39
2.08
0.00
64.00
3.39
2.08
0.00
65.00
3.39
2.08
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.08
0.00
67.00
3.39
2.08
0.00
68.00
3.39
2.08
0.00
69.00
3.39
2.08
0.00
70.00
3.39
2.08
0.00
71.00
3.39
2.08
0.00
72.00
3.39
2.08
0.00
73.00
3.39
2.08
0.00
74.00
3.39
2.08
0.00
75.00
3.39
2.08
0.00
76.00
3.39
2.08
0.00
77.00
3.39
2.08
0.00
78.00
3.39
2.08
0.00
79.00
3.39
2.08
0.00
80.00
3.39
2.08
0.00
81.00
3.39
2.08
0.00
82.00
3.39
2.08
0.00
83.00
3.39
2.08
0.00
84.00
3.39
2.08
0.00
85.00
3.39
2.08
0.00
86.00
3.39
2.08
0.00
87.00
3.39
2.08
0.00
88.00
3.39
2.08
0.00
89.00
3.39
2.08
0.00
90.00
3.39
2.08
0.00
91.00
3.39
2.08
0.00
92.00
3.39
2.08
0.00
93.00
3.39
2.08
0.00
94.00
3.39
2.08
0.00
95.00
3.39
2.08
0.00
96.00
3.39
2.08
0.00
97.00
3.39
2.08
0.00
98.00
3.39
2.08
0.00
99.00
3.39
2.08
0.00
100.00
3.39
2.08
0.00
101.00
3.39
2.08
0.00
102.00
3.39
2.08
0.00
103.00
3.39
2.08
0.00
104.00
3.39
2.08
0.00
105.00
3.39
2.08
0.00
106.00
3.39
2.08
0.00
107.00
3.39
2.08
0.00
108.00
3.39
2.08
0.00
109.00
3.39
2.08
0.00
110.00
3.39
2.08
0.00
111.00
3.39
2.08
0.00
112.00
3.39
2.08
0.00
113.00
3.39
2.08
0.00
114.00
3.39
2.08
0.00
115.00
3.39
2.08
0.00
116.00
3.39
2.08
0.00
117.00
3.39
2.08
0.00
118.00
3.39
2.08
0.00
119.00
3.39
2.08
0.00
120.00
3.39
2.08
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 13
Summary for Subcatchment 12S: POST TO POND 1
Runoff = 152.25 cfs @ 11.95 hrs, Volume= 7.387 af, Depth= 2.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN
Description
29.640 98
Impervious
6.730 61
>75% Grass cover, Good, HSG B
36.370 91
Weighted Average
6.730
18.50% Pervious Area
29.640
81.50% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 12S: POST TO POND 1
Hydrograph
170------- -- -- -- -- ---- -- -- ------------ -- ------------ -- -- Runoff
160 152.25 cfs
140
--i--
120 ' --'�- --'� --'�--------- --'� --'�---ftliLOff A_ r_da#36 370_at-
110
--r- -r--r--r--r--r----r--r--r--r--
90 I- -111noff '�D_epth=�2.44LL ..
80
70 Q T _
�i
60 -- -- J--1--1--L--L----J----L--L---------- ----L-----I --
50
40
-- -- -- -- ---- -- -- ------------ -- ------------ -- --
30 --i- -- -- -- -- --i-- -- --+----------i-- -- ----------i-- --+--
20
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 14
Hydrograph for Subcatchment 12S: POST TO POND 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.05
6.00
0.27
0.01
0.28
7.00
0.34
0.02
0.55
8.00
0.41
0.04
0.85
9.00
0.50
0.07
1.57
10.00
0.61
0.12
2.40
11.00
0.80
0.23
5.17
12.00
2.25
1.38
129.42
13.00
2.62
1.72
7.40
14.00
2.78
1.87
4.42
15.00
2.89
1.97
3.52
16.00
2.98
2.06
2.72
17.00
3.06
2.12
2.40
18.00
3.12
2.19
2.12
19.00
3.18
2.24
1.83
20.00
3.23
2.28
1.54
21.00
3.27
2.32
1.47
22.00
3.31
2.36
1.41
23.00
3.35
2.40
1.35
24.00
3.39
2.44
1.29
25.00
3.39
2.44
0.00
26.00
3.39
2.44
0.00
27.00
3.39
2.44
0.00
28.00
3.39
2.44
0.00
29.00
3.39
2.44
0.00
30.00
3.39
2.44
0.00
31.00
3.39
2.44
0.00
32.00
3.39
2.44
0.00
33.00
3.39
2.44
0.00
34.00
3.39
2.44
0.00
35.00
3.39
2.44
0.00
36.00
3.39
2.44
0.00
37.00
3.39
2.44
0.00
38.00
3.39
2.44
0.00
39.00
3.39
2.44
0.00
40.00
3.39
2.44
0.00
41.00
3.39
2.44
0.00
42.00
3.39
2.44
0.00
43.00
3.39
2.44
0.00
44.00
3.39
2.44
0.00
45.00
3.39
2.44
0.00
46.00
3.39
2.44
0.00
47.00
3.39
2.44
0.00
48.00
3.39
2.44
0.00
49.00
3.39
2.44
0.00
50.00
3.39
2.44
0.00
51.00
3.39
2.44
0.00
52.00
3.39
2.44
0.00
53.00
3.39
2.44
0.00
54.00
3.39
2.44
0.00
55.00
3.39
2.44
0.00
56.00
3.39
2.44
0.00
57.00
3.39
2.44
0.00
58.00
3.39
2.44
0.00
59.00
3.39
2.44
0.00
60.00
3.39
2.44
0.00
61.00
3.39
2.44
0.00
62.00
3.39
2.44
0.00
63.00
3.39
2.44
0.00
64.00
3.39
2.44
0.00
65.00
3.39
2.44
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.44
0.00
67.00
3.39
2.44
0.00
68.00
3.39
2.44
0.00
69.00
3.39
2.44
0.00
70.00
3.39
2.44
0.00
71.00
3.39
2.44
0.00
72.00
3.39
2.44
0.00
73.00
3.39
2.44
0.00
74.00
3.39
2.44
0.00
75.00
3.39
2.44
0.00
76.00
3.39
2.44
0.00
77.00
3.39
2.44
0.00
78.00
3.39
2.44
0.00
79.00
3.39
2.44
0.00
80.00
3.39
2.44
0.00
81.00
3.39
2.44
0.00
82.00
3.39
2.44
0.00
83.00
3.39
2.44
0.00
84.00
3.39
2.44
0.00
85.00
3.39
2.44
0.00
86.00
3.39
2.44
0.00
87.00
3.39
2.44
0.00
88.00
3.39
2.44
0.00
89.00
3.39
2.44
0.00
90.00
3.39
2.44
0.00
91.00
3.39
2.44
0.00
92.00
3.39
2.44
0.00
93.00
3.39
2.44
0.00
94.00
3.39
2.44
0.00
95.00
3.39
2.44
0.00
96.00
3.39
2.44
0.00
97.00
3.39
2.44
0.00
98.00
3.39
2.44
0.00
99.00
3.39
2.44
0.00
100.00
3.39
2.44
0.00
101.00
3.39
2.44
0.00
102.00
3.39
2.44
0.00
103.00
3.39
2.44
0.00
104.00
3.39
2.44
0.00
105.00
3.39
2.44
0.00
106.00
3.39
2.44
0.00
107.00
3.39
2.44
0.00
108.00
3.39
2.44
0.00
109.00
3.39
2.44
0.00
110.00
3.39
2.44
0.00
111.00
3.39
2.44
0.00
112.00
3.39
2.44
0.00
113.00
3.39
2.44
0.00
114.00
3.39
2.44
0.00
115.00
3.39
2.44
0.00
116.00
3.39
2.44
0.00
117.00
3.39
2.44
0.00
118.00
3.39
2.44
0.00
119.00
3.39
2.44
0.00
120.00
3.39
2.44
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 15
Summary for Subcatchment 14S: POST TO POND 6
Runoff = 54.59 cfs @ 11.95 hrs, Volume= 2.605 af, Depth= 2.26"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN
Description
10.310 98
Impervious
3.550 61
>75% Grass cover, Good, HSG B
13.860 89
Weighted Average
3.550
25.61 % Pervious Area
10.310
74.39% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 14S: POST TO POND 6
Hydrograph
60 Runoff
54.59 cfs--- - - - I -- -- -- - - -
I-- -- - -----'I---
ss
T--T--T--r--r--I---I-uY�-b��' -
50 I 2,yrr24h-r Raanfalt;;3.391"
45
-- --'-- L--L-----1---1--J--1--L-Ruhaoff Ar6&13,864at, -
40
-I-- --I-- -- -- - - ------I-- --RpnQff,V-Q1p1me=12 p0 elf -
H 35 1 1
w Run a#'1Depth=;2.26,
3 30
T--T--T--r--T--1-----�\/��.10-11
25
-1----1--r--Y--r--r--r--1---1--r--r--r--r--r--r--r--1--r--r- �f�=8-
20
--i-- --i-- -- -- ----------i-- -- -- -- -- -------i-- -- -- -- -- --
15
--'-- -'----L--L--L--1---1---1--J--1--L--L--L--L-------L----L--L--L--
10
s
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 16
Hydrograph for Subcatchment 14S: POST TO POND 6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.03
7.00
0.34
0.01
0.11
8.00
0.41
0.02
0.22
9.00
0.50
0.04
0.45
10.00
0.61
0.08
0.73
11.00
0.80
0.17
1.67
12.00
2.25
1.24
46.72
13.00
2.62
1.56
2.71
14.00
2.78
1.70
1.63
15.00
2.89
1.80
1.30
16.00
2.98
1.88
1.01
17.00
3.06
1.95
0.89
18.00
3.12
2.01
0.78
19.00
3.18
2.06
0.68
20.00
3.23
2.11
0.57
21.00
3.27
2.15
0.54
22.00
3.31
2.18
0.52
23.00
3.35
2.22
0.50
24.00
3.39
2.26
0.48
25.00
3.39
2.26
0.00
26.00
3.39
2.26
0.00
27.00
3.39
2.26
0.00
28.00
3.39
2.26
0.00
29.00
3.39
2.26
0.00
30.00
3.39
2.26
0.00
31.00
3.39
2.26
0.00
32.00
3.39
2.26
0.00
33.00
3.39
2.26
0.00
34.00
3.39
2.26
0.00
35.00
3.39
2.26
0.00
36.00
3.39
2.26
0.00
37.00
3.39
2.26
0.00
38.00
3.39
2.26
0.00
39.00
3.39
2.26
0.00
40.00
3.39
2.26
0.00
41.00
3.39
2.26
0.00
42.00
3.39
2.26
0.00
43.00
3.39
2.26
0.00
44.00
3.39
2.26
0.00
45.00
3.39
2.26
0.00
46.00
3.39
2.26
0.00
47.00
3.39
2.26
0.00
48.00
3.39
2.26
0.00
49.00
3.39
2.26
0.00
50.00
3.39
2.26
0.00
51.00
3.39
2.26
0.00
52.00
3.39
2.26
0.00
53.00
3.39
2.26
0.00
54.00
3.39
2.26
0.00
55.00
3.39
2.26
0.00
56.00
3.39
2.26
0.00
57.00
3.39
2.26
0.00
58.00
3.39
2.26
0.00
59.00
3.39
2.26
0.00
60.00
3.39
2.26
0.00
61.00
3.39
2.26
0.00
62.00
3.39
2.26
0.00
63.00
3.39
2.26
0.00
64.00
3.39
2.26
0.00
65.00
3.39
2.26
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.26
0.00
67.00
3.39
2.26
0.00
68.00
3.39
2.26
0.00
69.00
3.39
2.26
0.00
70.00
3.39
2.26
0.00
71.00
3.39
2.26
0.00
72.00
3.39
2.26
0.00
73.00
3.39
2.26
0.00
74.00
3.39
2.26
0.00
75.00
3.39
2.26
0.00
76.00
3.39
2.26
0.00
77.00
3.39
2.26
0.00
78.00
3.39
2.26
0.00
79.00
3.39
2.26
0.00
80.00
3.39
2.26
0.00
81.00
3.39
2.26
0.00
82.00
3.39
2.26
0.00
83.00
3.39
2.26
0.00
84.00
3.39
2.26
0.00
85.00
3.39
2.26
0.00
86.00
3.39
2.26
0.00
87.00
3.39
2.26
0.00
88.00
3.39
2.26
0.00
89.00
3.39
2.26
0.00
90.00
3.39
2.26
0.00
91.00
3.39
2.26
0.00
92.00
3.39
2.26
0.00
93.00
3.39
2.26
0.00
94.00
3.39
2.26
0.00
95.00
3.39
2.26
0.00
96.00
3.39
2.26
0.00
97.00
3.39
2.26
0.00
98.00
3.39
2.26
0.00
99.00
3.39
2.26
0.00
100.00
3.39
2.26
0.00
101.00
3.39
2.26
0.00
102.00
3.39
2.26
0.00
103.00
3.39
2.26
0.00
104.00
3.39
2.26
0.00
105.00
3.39
2.26
0.00
106.00
3.39
2.26
0.00
107.00
3.39
2.26
0.00
108.00
3.39
2.26
0.00
109.00
3.39
2.26
0.00
110.00
3.39
2.26
0.00
111.00
3.39
2.26
0.00
112.00
3.39
2.26
0.00
113.00
3.39
2.26
0.00
114.00
3.39
2.26
0.00
115.00
3.39
2.26
0.00
116.00
3.39
2.26
0.00
117.00
3.39
2.26
0.00
118.00
3.39
2.26
0.00
119.00
3.39
2.26
0.00
120.00
3.39
2.26
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 17
Summary for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Runoff = 23.02 cfs @ 11.97 hrs, Volume= 1.084 af, Depth= 1.05"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
3.800 98 Impervious
8.590 61 >75% Grass cover, Good, HSG B
12.390 72 Weighted Average
8.590 69.33% Pervious Area
3.800 30.67% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Hydrograph
--r-------r--r--r--r--r--------1 -t r--r--r--r--r----r--r--r--r--r--
25
24-- --'i --'i --'i--------'i-- -- --'i --'i --'i--------'i-- -- --'i --'i -- Runoff
23.02 Cfs--+--+------------ -- ----+--+---------+----+--+-- --
�/ p �j �j
22 --i------+--+--+--+----------+--+--+--+--r--+--i---i
21 ---- ------ --'i --'i --'i--------'-- -- _ rr
20 '--Z'YKrF24hfRc'fJ fat[#139;1
19 --'--
18 RLthOff Ar6atl 2.390 -at -
17 --'-- --'-- -- -- ----------'---- - gip- {---+---------'-- ---Q- --� --
16 --�------+--+--+--+----------+--+-- R"Yff �����@3� Y�4
w 14 --i-- --i-- -------------------'i-- -- -- i------------i--------------i---
---- --+-----'--- -- -- +--Rtmgf�'�DpthT9:06
0 12 ---- ---- --+-- ------------ -- -- -- -- --
------
-- �-�
LL11 ------------------------------------------------- - -- - - ----- ----
10 --i-- --i----+--+----------i-- -- -- --+-- ---------+-- -
g --'----'----------------------?--?-----'---�--------
-
- -��-
7 --�-- --�-- -- -- -------------- -- -- -- --i--------i-- -- -- --�i --
6 --i-- -i-- --+-- ----------i-- -- -- -- -- -------i-- -- --+-- -- --
5 --i --- -- -- -- -
4 --i-- -i--+--+--+--+--i---i---i--+--+--+--+--+--+--i---i--+--+--+--+--+--
3 --�,-- ----- -- --�, --�,--------�,-- -- -- -- --�,--------�,-- -- -- --�, --
2--------+-----------------------------------+----�--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 18
Hydrograph for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.01
12.00
2.25
0.40
21.07
13.00
2.62
0.59
1.48
14.00
2.78
0.68
0.92
15.00
2.89
0.75
0.75
16.00
2.98
0.80
0.59
17.00
3.06
0.84
0.53
18.00
3.12
0.88
0.47
19.00
3.18
0.92
0.41
20.00
3.23
0.95
0.35
21.00
3.27
0.97
0.33
22.00
3.31
1.00
0.32
23.00
3.35
1.03
0.31
24.00
3.39
1.05
0.30
25.00
3.39
1.05
0.00
26.00
3.39
1.05
0.00
27.00
3.39
1.05
0.00
28.00
3.39
1.05
0.00
29.00
3.39
1.05
0.00
30.00
3.39
1.05
0.00
31.00
3.39
1.05
0.00
32.00
3.39
1.05
0.00
33.00
3.39
1.05
0.00
34.00
3.39
1.05
0.00
35.00
3.39
1.05
0.00
36.00
3.39
1.05
0.00
37.00
3.39
1.05
0.00
38.00
3.39
1.05
0.00
39.00
3.39
1.05
0.00
40.00
3.39
1.05
0.00
41.00
3.39
1.05
0.00
42.00
3.39
1.05
0.00
43.00
3.39
1.05
0.00
44.00
3.39
1.05
0.00
45.00
3.39
1.05
0.00
46.00
3.39
1.05
0.00
47.00
3.39
1.05
0.00
48.00
3.39
1.05
0.00
49.00
3.39
1.05
0.00
50.00
3.39
1.05
0.00
51.00
3.39
1.05
0.00
52.00
3.39
1.05
0.00
53.00
3.39
1.05
0.00
54.00
3.39
1.05
0.00
55.00
3.39
1.05
0.00
56.00
3.39
1.05
0.00
57.00
3.39
1.05
0.00
58.00
3.39
1.05
0.00
59.00
3.39
1.05
0.00
60.00
3.39
1.05
0.00
61.00
3.39
1.05
0.00
62.00
3.39
1.05
0.00
63.00
3.39
1.05
0.00
64.00
3.39
1.05
0.00
65.00
3.39
1.05
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
1.05
0.00
67.00
3.39
1.05
0.00
68.00
3.39
1.05
0.00
69.00
3.39
1.05
0.00
70.00
3.39
1.05
0.00
71.00
3.39
1.05
0.00
72.00
3.39
1.05
0.00
73.00
3.39
1.05
0.00
74.00
3.39
1.05
0.00
75.00
3.39
1.05
0.00
76.00
3.39
1.05
0.00
77.00
3.39
1.05
0.00
78.00
3.39
1.05
0.00
79.00
3.39
1.05
0.00
80.00
3.39
1.05
0.00
81.00
3.39
1.05
0.00
82.00
3.39
1.05
0.00
83.00
3.39
1.05
0.00
84.00
3.39
1.05
0.00
85.00
3.39
1.05
0.00
86.00
3.39
1.05
0.00
87.00
3.39
1.05
0.00
88.00
3.39
1.05
0.00
89.00
3.39
1.05
0.00
90.00
3.39
1.05
0.00
91.00
3.39
1.05
0.00
92.00
3.39
1.05
0.00
93.00
3.39
1.05
0.00
94.00
3.39
1.05
0.00
95.00
3.39
1.05
0.00
96.00
3.39
1.05
0.00
97.00
3.39
1.05
0.00
98.00
3.39
1.05
0.00
99.00
3.39
1.05
0.00
100.00
3.39
1.05
0.00
101.00
3.39
1.05
0.00
102.00
3.39
1.05
0.00
103.00
3.39
1.05
0.00
104.00
3.39
1.05
0.00
105.00
3.39
1.05
0.00
106.00
3.39
1.05
0.00
107.00
3.39
1.05
0.00
108.00
3.39
1.05
0.00
109.00
3.39
1.05
0.00
110.00
3.39
1.05
0.00
111.00
3.39
1.05
0.00
112.00
3.39
1.05
0.00
113.00
3.39
1.05
0.00
114.00
3.39
1.05
0.00
115.00
3.39
1.05
0.00
116.00
3.39
1.05
0.00
117.00
3.39
1.05
0.00
118.00
3.39
1.05
0.00
119.00
3.39
1.05
0.00
120.00
3.39
1.05
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 19
Summary for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Runoff = 3.74 cfs @ 12.22 hrs, Volume= 0.504 af, Depth= 0.41"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac)
CN
Description
7.730
55
Woods, Good, HSG B
7.000
61
>75% Grass cover, Good, HSG B
14.730
58
Weighted Average
14.730
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Hydrograph
■ Runoff
4 3.74 Cfs
Type 11'',24-h'',r
2vr+24hr RainfallT3.,39�
3 Ruhoff Arda=14.730 at
R4npff'', VQIL;me=',0.$04 1
- --- ----+---------- ----+--+-- _Runoff DepthT0.417-
2-
F16W'� Longth=1,16a'
Tc=�1.'$ mill
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 20
Hydrograph for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.00
12.00
2.25
0.08
0.73
13.00
2.62
0.16
1.01
14.00
2.78
0.21
0.62
15.00
2.89
0.24
0.49
16.00
2.98
0.27
0.40
17.00
3.06
0.29
0.35
18.00
3.12
0.31
0.32
19.00
3.18
0.33
0.28
20.00
3.23
0.35
0.25
21.00
3.27
0.37
0.23
22.00
3.31
0.38
0.22
23.00
3.35
0.40
0.22
24.00
3.39
0.41
0.21
25.00
3.39
0.41
0.00
26.00
3.39
0.41
0.00
27.00
3.39
0.41
0.00
28.00
3.39
0.41
0.00
29.00
3.39
0.41
0.00
30.00
3.39
0.41
0.00
31.00
3.39
0.41
0.00
32.00
3.39
0.41
0.00
33.00
3.39
0.41
0.00
34.00
3.39
0.41
0.00
35.00
3.39
0.41
0.00
36.00
3.39
0.41
0.00
37.00
3.39
0.41
0.00
38.00
3.39
0.41
0.00
39.00
3.39
0.41
0.00
40.00
3.39
0.41
0.00
41.00
3.39
0.41
0.00
42.00
3.39
0.41
0.00
43.00
3.39
0.41
0.00
44.00
3.39
0.41
0.00
45.00
3.39
0.41
0.00
46.00
3.39
0.41
0.00
47.00
3.39
0.41
0.00
48.00
3.39
0.41
0.00
49.00
3.39
0.41
0.00
50.00
3.39
0.41
0.00
51.00
3.39
0.41
0.00
52.00
3.39
0.41
0.00
53.00
3.39
0.41
0.00
54.00
3.39
0.41
0.00
55.00
3.39
0.41
0.00
56.00
3.39
0.41
0.00
57.00
3.39
0.41
0.00
58.00
3.39
0.41
0.00
59.00
3.39
0.41
0.00
60.00
3.39
0.41
0.00
61.00
3.39
0.41
0.00
62.00
3.39
0.41
0.00
63.00
3.39
0.41
0.00
64.00
3.39
0.41
0.00
65.00
3.39
0.41
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
0.41
0.00
67.00
3.39
0.41
0.00
68.00
3.39
0.41
0.00
69.00
3.39
0.41
0.00
70.00
3.39
0.41
0.00
71.00
3.39
0.41
0.00
72.00
3.39
0.41
0.00
73.00
3.39
0.41
0.00
74.00
3.39
0.41
0.00
75.00
3.39
0.41
0.00
76.00
3.39
0.41
0.00
77.00
3.39
0.41
0.00
78.00
3.39
0.41
0.00
79.00
3.39
0.41
0.00
80.00
3.39
0.41
0.00
81.00
3.39
0.41
0.00
82.00
3.39
0.41
0.00
83.00
3.39
0.41
0.00
84.00
3.39
0.41
0.00
85.00
3.39
0.41
0.00
86.00
3.39
0.41
0.00
87.00
3.39
0.41
0.00
88.00
3.39
0.41
0.00
89.00
3.39
0.41
0.00
90.00
3.39
0.41
0.00
91.00
3.39
0.41
0.00
92.00
3.39
0.41
0.00
93.00
3.39
0.41
0.00
94.00
3.39
0.41
0.00
95.00
3.39
0.41
0.00
96.00
3.39
0.41
0.00
97.00
3.39
0.41
0.00
98.00
3.39
0.41
0.00
99.00
3.39
0.41
0.00
100.00
3.39
0.41
0.00
101.00
3.39
0.41
0.00
102.00
3.39
0.41
0.00
103.00
3.39
0.41
0.00
104.00
3.39
0.41
0.00
105.00
3.39
0.41
0.00
106.00
3.39
0.41
0.00
107.00
3.39
0.41
0.00
108.00
3.39
0.41
0.00
109.00
3.39
0.41
0.00
110.00
3.39
0.41
0.00
111.00
3.39
0.41
0.00
112.00
3.39
0.41
0.00
113.00
3.39
0.41
0.00
114.00
3.39
0.41
0.00
115.00
3.39
0.41
0.00
116.00
3.39
0.41
0.00
117.00
3.39
0.41
0.00
118.00
3.39
0.41
0.00
119.00
3.39
0.41
0.00
120.00
3.39
0.41
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 21
Summary for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Runoff = 1.11 cfs @ 12.21 hrs, Volume= 0.140 af, Depth= 0.45"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac)
CN
Description
3.190
55
Woods, Good, HSG B
0.580
78
Row crops, straight row, Good, HSG B
3.770
59
Weighted Average
3.770
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Hydrograph
� � � � � � � �� � � � � �� �� �� �� �� �� � � � � � ■Runoff
1.11 Cfs
II'24-h,r-
2yr+24hr RainfallT3.39,..
RUn6ffAiea=3.770 at
R4nOff',VQ1gme=0.�,140 calf
Runoff off ' D e pt h T0.45..
3 ROW' Longth=1,162v
0
Tc=�1.',9 mill
OW-59
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 11,0 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 22
Hydrograph for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.00
12.00
2.25
0.09
0.25
13.00
2.62
0.18
0.28
14.00
2.78
0.23
0.17
15.00
2.89
0.27
0.13
16.00
2.98
0.30
0.11
17.00
3.06
0.32
0.10
18.00
3.12
0.35
0.09
19.00
3.18
0.37
0.08
20.00
3.23
0.38
0.07
21.00
3.27
0.40
0.06
22.00
3.31
0.42
0.06
23.00
3.35
0.43
0.06
24.00
3.39
0.45
0.06
25.00
3.39
0.45
0.00
26.00
3.39
0.45
0.00
27.00
3.39
0.45
0.00
28.00
3.39
0.45
0.00
29.00
3.39
0.45
0.00
30.00
3.39
0.45
0.00
31.00
3.39
0.45
0.00
32.00
3.39
0.45
0.00
33.00
3.39
0.45
0.00
34.00
3.39
0.45
0.00
35.00
3.39
0.45
0.00
36.00
3.39
0.45
0.00
37.00
3.39
0.45
0.00
38.00
3.39
0.45
0.00
39.00
3.39
0.45
0.00
40.00
3.39
0.45
0.00
41.00
3.39
0.45
0.00
42.00
3.39
0.45
0.00
43.00
3.39
0.45
0.00
44.00
3.39
0.45
0.00
45.00
3.39
0.45
0.00
46.00
3.39
0.45
0.00
47.00
3.39
0.45
0.00
48.00
3.39
0.45
0.00
49.00
3.39
0.45
0.00
50.00
3.39
0.45
0.00
51.00
3.39
0.45
0.00
52.00
3.39
0.45
0.00
53.00
3.39
0.45
0.00
54.00
3.39
0.45
0.00
55.00
3.39
0.45
0.00
56.00
3.39
0.45
0.00
57.00
3.39
0.45
0.00
58.00
3.39
0.45
0.00
59.00
3.39
0.45
0.00
60.00
3.39
0.45
0.00
61.00
3.39
0.45
0.00
62.00
3.39
0.45
0.00
63.00
3.39
0.45
0.00
64.00
3.39
0.45
0.00
65.00
3.39
0.45
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
0.45
0.00
67.00
3.39
0.45
0.00
68.00
3.39
0.45
0.00
69.00
3.39
0.45
0.00
70.00
3.39
0.45
0.00
71.00
3.39
0.45
0.00
72.00
3.39
0.45
0.00
73.00
3.39
0.45
0.00
74.00
3.39
0.45
0.00
75.00
3.39
0.45
0.00
76.00
3.39
0.45
0.00
77.00
3.39
0.45
0.00
78.00
3.39
0.45
0.00
79.00
3.39
0.45
0.00
80.00
3.39
0.45
0.00
81.00
3.39
0.45
0.00
82.00
3.39
0.45
0.00
83.00
3.39
0.45
0.00
84.00
3.39
0.45
0.00
85.00
3.39
0.45
0.00
86.00
3.39
0.45
0.00
87.00
3.39
0.45
0.00
88.00
3.39
0.45
0.00
89.00
3.39
0.45
0.00
90.00
3.39
0.45
0.00
91.00
3.39
0.45
0.00
92.00
3.39
0.45
0.00
93.00
3.39
0.45
0.00
94.00
3.39
0.45
0.00
95.00
3.39
0.45
0.00
96.00
3.39
0.45
0.00
97.00
3.39
0.45
0.00
98.00
3.39
0.45
0.00
99.00
3.39
0.45
0.00
100.00
3.39
0.45
0.00
101.00
3.39
0.45
0.00
102.00
3.39
0.45
0.00
103.00
3.39
0.45
0.00
104.00
3.39
0.45
0.00
105.00
3.39
0.45
0.00
106.00
3.39
0.45
0.00
107.00
3.39
0.45
0.00
108.00
3.39
0.45
0.00
109.00
3.39
0.45
0.00
110.00
3.39
0.45
0.00
111.00
3.39
0.45
0.00
112.00
3.39
0.45
0.00
113.00
3.39
0.45
0.00
114.00
3.39
0.45
0.00
115.00
3.39
0.45
0.00
116.00
3.39
0.45
0.00
117.00
3.39
0.45
0.00
118.00
3.39
0.45
0.00
119.00
3.39
0.45
0.00
120.00
3.39
0.45
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 23
Summary for Pond 2P: POND 2
Inflow Area = 19.790 ac, 74.23% Impervious, Inflow Depth = 2.17" for 2yr-24hr event
Inflow = 75.44 cfs @ 11.95 hrs, Volume= 3.576 of
Outflow = 1.10 cfs @ 18.04 hrs, Volume= 3.559 af, Atten= 99%, Lag= 365.2 min
Primary = 1.10 cfs @ 18.04 hrs, Volume= 3.559 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 714.93' @ 18.04 hrs Surf.Area= 29,741 sf Storage= 112,722 cf
Plug -Flow detention time= 1,278.2 min calculated for 3.557 of (99% of inflow)
Center -of -Mass det. time= 1,276.9 min ( 2,085.6 - 808.7 )
Volume Invert
Avail.Storage Storage Description
#1 710.50'
290,610 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.50
20,568
0 0
711.00
22,310
10,720 10,720
712.00
24,113
23,212 33,931
713.00
25,975
25,044 58,975
714.00
27,897
26,936 85,911
715.00
29,879
28,888 114,799
716.00
31,920
30,900 145,699
717.00
34,021
32,971 178,669
718.00
36,183
35,102 213,771
719.00
38,404
37,294 251,065
720.00
40,686
39,545 290,610
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.50'
4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Slotted Weirs X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=1.10 cfs @ 18.04 hrs HW=714.93' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 1.10 cfs of 32.23 cfs potential flow)
2=4.5" Orifice (Orifice Controls 1.10 cfs @ 9.92 fps)
3=Slotted Weirs ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.50' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 24
'0 i glPAA14i
Hydrograph
7544 Cfs
I
I I
I I I I I
I
I
I I I I I I I I I I
IN Inflow
.
r--I--T--I--T--I--I--T-I----I--I--I--T____r____T----T__
IN Outflow
- - ------I--
--I--
--I-- --I--
-Inflow
Are9=19.790 ae -
IN Primary
I I I I I I I
■ Secondary
80
,1,
,-
- I---------------1,----1,----1,--
---r--I--T--I--T--I--I--I-�--I
-
I-----1,---II--- -
e 1=14.
- --
I r r
70
,1,
- I--1,-----1,--
--1,--
--1,-- --1,--
--1,---Stlloraje=l
-Z72 _ef_
65
--I- -I--,
--I---I
--I---I
--I-- --I--,
--I--r
--I--r --I--,--I---I--I---I -
60
-7---r----T----T----7--II
-7--Ir-7--Ir-7--7--11--r----T----7--
55
-I- -I--;
----T----T--I--
-I--;
-I--;
--I--; --I--;----T--I--T-
50
w
- - 7--r----T----T----7--I
I I
I
I I
-7--Ir-7--Ir-7--r----r----T----7--
I I I I I
I
I
I I I I I I I I I I
u 45-
I--T-
-I--T--I - -- - -- -
--
- --
--- -- --- r- ---r--I--T--I - -- --
3 40
0
-,- r--
r--II--
T--II--
I
7--II-- 7----,--Ir-
I I I
I
r--I r-r--r--11--r--II-- T----T--
I1
lL 35
-7- r--
r --I
-- --I-
T
I-- --I ---r---r---r
- --7
T
7
7r --1--r---T -----7--
30
-,- r--r----T----T----7----,--Ir-r--Ir-r--r----r----T----r--
2S
-1-UL-r--I
T
Y T--I
1--r-1--r-1--1----r--I--T--I--Y--
20
-1--r----T----T----1----1--r-1--r-1--1----r----T__I__Y__
15
10
1.10 Cfs
0.00 Cfs
0
0
5 10 15
20 25 30
35
40 45
50 55 60 65 70
75
80
85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.50
0.00
0.00
0.00
2.50
0.00
0
710.50
0.00
0.00
0.00
5.00
0.00
0
710.50
0.00
0.00
0.00
7.50
0.17
418
710.52
0.00
0.00
0.00
10.00
0.92
4,382
710.71
0.10
0.10
0.00
12.50
6.04
93,013
714.25
1.00
1.00
0.00
15.00
1.82
109,693
714.83
1.08
1.08
0.00
17.50
1.18
112,644
714.93
1.10
1.10
0.00
20.00
0.80
111,706
714.90
1.09
1.09
0.00
22.50
0.72
108,766
714.80
1.08
1.08
0.00
25.00
0.00
103,115
714.60
1.05
1.05
0.00
27.50
0.00
93,841
714.28
1.01
1.01
0.00
30.00
0.00
84,971
713.97
0.96
0.96
0.00
32.50
0.00
76,511
713.66
0.92
0.92
0.00
35.00
0.00
68,473
713.36
0.87
0.87
0.00
37.50
0.00
60,863
713.07
0.82
0.82
0.00
40.00
0.00
53,693
712.80
0.77
0.77
0.00
42.50
0.00
46,969
712.53
0.72
0.72
0.00
45.00
0.00
40,703
712.28
0.67
0.67
0.00
47.50
0.00
34,901
712.04
0.62
0.62
0.00
50.00
0.00
29,572
711.82
0.57
0.57
0.00
52.50
0.00
24,726
711.61
0.51
0.51
0.00
55.00
0.00
20,368
711.43
0.46
0.46
0.00
57.50
0.00
16,506
711.26
0.40
0.40
0.00
60.00
0.00
13,148
711.11
0.35
0.35
0.00
62.50
0.00
10,298
710.98
0.29
0.29
0.00
65.00
0.00
7,964
710.88
0.23
0.23
0.00
67.50
0.00
6,152
710.79
0.17
0.17
0.00
70.00
0.00
4,872
710.73
0.12
0.12
0.00
72.50
0.00
3,977
710.69
0.08
0.08
0.00
75.00
0.00
3,333
710.66
0.06
0.06
0.00
77.50
0.00
2,854
710.64
0.05
0.05
0.00
80.00
0.00
2,488
710.62
0.04
0.04
0.00
82.50
0.00
2,201
710.61
0.03
0.03
0.00
85.00
0.00
1,970
710.60
0.02
0.02
0.00
87.50
0.00
1,781
710.59
0.02
0.02
0.00
90.00
0.00
1,624
710.58
0.02
0.02
0.00
92.50
0.00
1,491
710.57
0.01
0.01
0.00
95.00
0.00
1,378
710.57
0.01
0.01
0.00
97.50
0.00
1,280
710.56
0.01
0.01
0.00
100.00
0.00
1,195
710.56
0.01
0.01
0.00
102.50
0.00
1,120
710.55
0.01
0.01
0.00
105.00
0.00
1,054
710.55
0.01
0.01
0.00
107.50
0.00
995
710.55
0.01
0.01
0.00
110.00
0.00
942
710.55
0.01
0.01
0.00
112.50
0.00
895
710.54
0.01
0.01
0.00
115.00
0.00
851
710.54
0.00
0.00
0.00
117.50
0.00
812
710.54
0.00
0.00
0.00
120.00
0.00
776
710.54
0.00
0.00
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 26
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.50
0.00
0.00
0.00
710.60
0.03
0.03
0.00
710.70
0.09
0.09
0.00
710.80
0.18
0.18
0.00
710.90
0.25
0.25
0.00
711.00
0.30
0.30
0.00
711.10
0.34
0.34
0.00
711.20
0.38
0.38
0.00
711.30
0.42
0.42
0.00
711.40
0.45
0.45
0.00
711.50
0.48
0.48
0.00
711.60
0.51
0.51
0.00
711.70
0.54
0.54
0.00
711.80
0.56
0.56
0.00
711.90
0.59
0.59
0.00
712.00
0.61
0.61
0.00
712.10
0.63
0.63
0.00
712.20
0.65
0.65
0.00
712.30
0.68
0.68
0.00
712.40
0.70
0.70
0.00
712.50
0.72
0.72
0.00
712.60
0.74
0.74
0.00
712.70
0.75
0.75
0.00
712.80
0.77
0.77
0.00
712.90
0.79
0.79
0.00
713.00
0.81
0.81
0.00
713.10
0.83
0.83
0.00
713.20
0.84
0.84
0.00
713.30
0.86
0.86
0.00
713.40
0.88
0.88
0.00
713.50
0.89
0.89
0.00
713.60
0.91
0.91
0.00
713.70
0.92
0.92
0.00
713.80
0.94
0.94
0.00
713.90
0.95
0.95
0.00
714.00
0.97
0.97
0.00
714.10
0.98
0.98
0.00
714.20
1.00
1.00
0.00
714.30
1.01
1.01
0.00
714.40
1.02
1.02
0.00
714.50
1.04
1.04
0.00
714.60
1.05
1.05
0.00
714.70
1.07
1.07
0.00
714.80
1.08
1.08
0.00
714.90
1.09
1.09
0.00
715.00
1.10
1.10
0.00
715.10
2.03
2.03
0.00
715.20
3.71
3.71
0.00
715.30
5.89
5.89
0.00
715.40
8.46
8.46
0.00
715.50
11.38
11.38
0.00
715.60
13.69
13.69
0.00
715.70
15.53
15.53
0.00
715.80
17.13
17.13
0.00
715.90
18.57
18.57
0.00
716.00
19.90
19.90
0.00
716.10
21.14
21.14
0.00
716.20
22.31
22.31
0.00
716.30
23.41
23.41
0.00
716.40
24.46
24.46
0.00
716.50
25.47
25.47
0.00
716.60
26.43
26.43
0.00
716.70
27.36
27.36
0.00
716.80
28.26
28.26
0.00
716.90
29.13
29.13
0.00
717.00
29.97
29.97
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
717.10
30.80
30.80
0.00
717.20
31.59
31.59
0.00
717.30
32.37
32.37
0.00
717.40
33.13
33.13
0.00
717.50
33.87
33.87
0.00
717.60
34.60
34.60
0.00
717.70
35.31
35.31
0.00
717.80
36.00
36.00
0.00
717.90
36.69
36.69
0.00
718.00
37.36
37.36
0.00
718.10
39.67
39.67
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 27
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.50
20,568
0
710.60
20,916
2,074
710.70
21,265
4,183
710.80
21,613
6,327
710.90
21,962
8,506
711.00
22,310
10,720
711.10
22,490
12,960
711.20
22,671
15,218
711.30
22,851
17,494
711.40
23,031
19,788
711.50
23,212
22,100
711.60
23,392
24,430
711.70
23,572
26,778
711.80
23,752
29,144
711.90
23,933
31,529
712.00
24,113
33,931
712.10
24,299
36,352
712.20
24,485
38,791
712.30
24,672
41,249
712.40
24,858
43,725
712.50
25,044
46,220
712.60
25,230
48,734
712.70
25,416
51,266
712.80
25,603
53,817
712.90
25,789
56,387
713.00
25,975
58,975
713.10
26,167
61,582
713.20
26,359
64,208
713.30
26,552
66,854
713.40
26,744
69,519
713.50
26,936
72,203
713.60
27,128
74,906
713.70
27,320
77,628
713.80
27,513
80,370
713.90
27,705
83,131
714.00
27,897
85,911
714.10
28,095
88,711
714.20
28,293
91,530
714.30
28,492
94,369
714.40
28,690
97,228
714.50
28,888
100,107
714.60
29,086
103,006
714.70
29,284
105,924
714.80
29,483
108,863
714.90
29,681
111,821
715.00
29,879
114,799
715.10
30,083
117,797
715.20
30,287
120,816
715.30
30,491
123,855
715.40
30,695
126,914
715.50
30,900
129,994
715.60
31,104
133,094
715.70
31,308
136,214
715.80
31,512
139,355
715.90
31,716
142,517
716.00
31,920
145,699
716.10
32,130
148,901
716.20
32,340
152,125
716.30
32,550
155,369
716.40
32,760
158,635
716.50
32,971
161,921
716.60
33,181
165,229
716.70
33,391
168,557
716.80
33,601
171,907
716.90
33,811
175,277
717.00
34.021
178.669
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
717.10
34,237
182,082
717.20
34,453
185,516
717.30
34,670
188,973
717.40
34,886
192,450
717.50
35,102
195,950
717.60
35,318
199,471
717.70
35,534
203,013
717.80
35,751
206,578
717.90
35,967
210,164
718.00
36,183
213,771
718.10
36,405
217,400
718.20
36,627
221,052
718.30
36,849
224,726
718.40
37,071
228,422
718.50
37,294
232,140
718.60
37,516
235,881
718.70
37,738
239,643
718.80
37,960
243,428
718.90
38,182
247,235
719.00
38,404
251,065
719.10
38,632
254,916
719.20
38,860
258,791
719.30
39,089
262,688
719.40
39,317
266,609
719.50
39,545
270,552
719.60
39,773
274,518
719.70
40,001
278,506
719.80
40,230
282,518
719.90
40,458
286,552
720.00
40,686
290,610

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 28
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 2.17" for 2yr-24hr event
Inflow = 58.17 cfs @ 11.95 hrs, Volume= 2.758 of
Outflow = 0.73 cfs @ 19.07 hrs, Volume= 2.730 af, Atten= 99%, Lag= 426.7 min
Primary = 0.73 cfs @ 19.07 hrs, Volume= 2.730 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 703.56' @ 19.07 hrs Surf.Area= 50,911 sf Storage= 90,231 cf
Plug -Flow detention time= 1,531.0 min calculated for 2.729 of (99% of inflow)
Center -of -Mass det. time= 1,526.6 min ( 2,335.3 - 808.7 )
Volume
Invert Avail.Storage Storage Description
#1
701.50'
519,480 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.50
22,118
0
0
702.00
43,792
16,478
16,478
703.00
48,320
46,056
62,534
704.00
52,961
50,641
113,174
705.00
57,717
55,339
168,513
706.00
62,582
60,150
228,663
707.00
67,552
65,067
293,730
708.00
72,628
70,090
363,820
709.00
77,809
75,219
439,038
710.00
83,074
80,442
519,480
Device Routing Invert Outlet Devices
#1 Primary 701.39' 24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1 701.50' 4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1 705.00' 36.0" W x 6.0" H Vert. Slotted Weirs X 2.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=0.73 cfs @ 19.07 hrs HW=703.56' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 0.73 cfs of 14.49 cfs potential flow)
2=4.5" Orifice (Orifice Controls 0.73 cfs @ 6.59 fps)
3=Slotted Weirs ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.50' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 29
'1.71 E:iA19]isIll
r -
-I - - r -
Hydrograph
-I- - Y - -I- - r - - I- -
r -
- r - r - - r - r - - r - -I - - r - -I - - r - -I- - r - -
--I---I
-----II
---------------I--I_
- - _
■Inflow
IN Outflow
58.17 CfS
+--+----+----+----+----+-r�11VYY
/`11 GQ� 16 L�V �W
IN Primary
65
+
■ Secondary
60
-7-
7--T----T----T----7--II
-7--IF--1
T -T-- -I-
-P�ekl EIeW=713.6�`
55
-�-
J--L--1--1--1--1--I--1--I--�--L-1--L}
-'L--1p--L--1-��1�--1-^1;�-
50
40
w
u 35
' �I
-7-
7--r----T----T--Ir--T
-7--Ir--7--I
- --r----r----T----7--
3 30
0
LL
25
-1---+----T----T--------1--r---r---r----+----+----+--
I
I
I
I I
I I I I I
I
I I I I I I I I I I I
20
- -
-I--
II --I--
--I--
--I-- --II -
--II
- --II --I-- II --I-- II --I-- --I-- --
15
-�-
J--L--1--1--I--1--I--1--I--�--L-1--L-J--L--1--L--1--1--1--1-
10
0.73 cfs
0.00 Cfs
0
0 5 10 15
20 25 30
35
40 45
50 55 60 65 70
75
80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.50
0.00
0.00
0.00
2.50
0.00
0
701.50
0.00
0.00
0.00
5.00
0.00
0
701.50
0.00
0.00
0.00
7.50
0.13
323
701.51
0.00
0.00
0.00
10.00
0.71
3,454
701.64
0.05
0.05
0.00
12.50
4.65
72,400
703.20
0.65
0.65
0.00
15.00
1.41
86,360
703.48
0.71
0.71
0.00
17.50
0.91
89,722
703.55
0.73
0.73
0.00
20.00
0.62
90,050
703.55
0.73
0.73
0.00
22.50
0.56
88,791
703.53
0.72
0.72
0.00
25.00
0.00
85,393
703.46
0.71
0.71
0.00
27.50
0.00
79,129
703.34
0.68
0.68
0.00
30.00
0.00
73,096
703.22
0.66
0.66
0.00
32.50
0.00
67,294
703.10
0.63
0.63
0.00
35.00
0.00
61,728
702.98
0.61
0.61
0.00
37.50
0.00
56,399
702.87
0.58
0.58
0.00
40.00
0.00
51,309
702.77
0.55
0.55
0.00
42.50
0.00
46,463
702.66
0.52
0.52
0.00
45.00
0.00
41,860
702.56
0.50
0.50
0.00
47.50
0.00
37,506
702.47
0.47
0.47
0.00
50.00
0.00
33,400
702.38
0.44
0.44
0.00
52.50
0.00
29,546
702.29
0.41
0.41
0.00
55.00
0.00
25,946
702.21
0.39
0.39
0.00
57.50
0.00
22,602
702.14
0.36
0.36
0.00
60.00
0.00
19,516
702.07
0.33
0.33
0.00
62.50
0.00
16,689
702.00
0.30
0.30
0.00
65.00
0.00
14,126
701.94
0.27
0.27
0.00
67.50
0.00
11,839
701.89
0.24
0.24
0.00
70.00
0.00
9,838
701.83
0.21
0.21
0.00
72.50
0.00
8,168
701.79
0.17
0.17
0.00
75.00
0.00
6,831
701.75
0.13
0.13
0.00
77.50
0.00
5,776
701.72
0.10
0.10
0.00
80.00
0.00
4,942
701.69
0.08
0.08
0.00
82.50
0.00
4,280
701.67
0.07
0.07
0.00
85.00
0.00
3,748
701.65
0.05
0.05
0.00
87.50
0.00
3,316
701.63
0.04
0.04
0.00
90.00
0.00
2,961
701.62
0.04
0.04
0.00
92.50
0.00
2,666
701.61
0.03
0.03
0.00
95.00
0.00
2,418
701.60
0.03
0.03
0.00
97.50
0.00
2,208
701.59
0.02
0.02
0.00
100.00
0.00
2,029
701.58
0.02
0.02
0.00
102.50
0.00
1,873
701.58
0.02
0.02
0.00
105.00
0.00
1,738
701.57
0.01
0.01
0.00
107.50
0.00
1,620
701.57
0.01
0.01
0.00
110.00
0.00
1,515
701.56
0.01
0.01
0.00
112.50
0.00
1,422
701.56
0.01
0.01
0.00
115.00
0.00
1,339
701.56
0.01
0.01
0.00
117.50
0.00
1,265
701.55
0.01
0.01
0.00
120.00
0.00
1,198
701.55
0.01
0.01
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 31
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.50
0.00
0.00
0.00
701.60
0.03
0.03
0.00
701.70
0.09
0.09
0.00
701.80
0.18
0.18
0.00
701.90
0.25
0.25
0.00
702.00
0.30
0.30
0.00
702.10
0.34
0.34
0.00
702.20
0.38
0.38
0.00
702.30
0.42
0.42
0.00
702.40
0.45
0.45
0.00
702.50
0.48
0.48
0.00
702.60
0.51
0.51
0.00
702.70
0.54
0.54
0.00
702.80
0.56
0.56
0.00
702.90
0.59
0.59
0.00
703.00
0.61
0.61
0.00
703.10
0.63
0.63
0.00
703.20
0.65
0.65
0.00
703.30
0.68
0.68
0.00
703.40
0.70
0.70
0.00
703.50
0.72
0.72
0.00
703.60
0.74
0.74
0.00
703.70
0.75
0.75
0.00
703.80
0.77
0.77
0.00
703.90
0.79
0.79
0.00
704.00
0.81
0.81
0.00
704.10
0.83
0.83
0.00
704.20
0.84
0.84
0.00
704.30
0.86
0.86
0.00
704.40
0.88
0.88
0.00
704.50
0.89
0.89
0.00
704.60
0.91
0.91
0.00
704.70
0.92
0.92
0.00
704.80
0.94
0.94
0.00
704.90
0.95
0.95
0.00
705.00
0.97
0.97
0.00
705.10
1.59
1.59
0.00
705.20
2.72
2.72
0.00
705.30
4.18
4.18
0.00
705.40
5.90
5.90
0.00
705.50
7.85
7.85
0.00
705.60
9.39
9.39
0.00
705.70
10.62
10.62
0.00
705.80
11.69
11.69
0.00
705.90
12.66
12.66
0.00
706.00
13.55
13.55
0.00
706.10
14.39
14.39
0.00
706.20
15.17
15.17
0.00
706.30
15.91
15.91
0.00
706.40
16.61
16.61
0.00
706.50
17.29
17.29
0.00
706.60
17.94
17.94
0.00
706.70
18.56
18.56
0.00
706.80
19.17
19.17
0.00
706.90
19.75
19.75
0.00
707.00
20.32
20.32
0.00
707.10
20.87
20.87
0.00
707.20
21.41
21.41
0.00
707.30
21.93
21.93
0.00
707.40
22.44
22.44
0.00
707.50
22.94
22.94
0.00
707.60
23.43
23.43
0.00
707.70
23.90
23.90
0.00
707.80
24.37
24.37
0.00
707.90
24.83
24.83
0.00
708.00
25.28
25.28
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.10
27.38
27.38
0.00
708.20
30.84
30.84
0.00
708.30
35.18
35.18
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 32
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.50
22,118
0
701.60
26,453
2,429
701.70
30,788
5,291
701.80
35,122
8,586
701.90
39,457
12,315
702.00
43,792
16,478
702.10
44,245
20,879
702.20
44,698
25,326
702.30
45,150
29,819
702.40
45,603
34,357
702.50
46,056
38,940
702.60
46,509
43,568
702.70
46,962
48,241
702.80
47,414
52,960
702.90
47,867
57,724
703.00
48,320
62,534
703.10
48,784
67,389
703.20
49,248
72,290
703.30
49,712
77,238
703.40
50,176
82,233
703.50
50,641
87,274
703.60
51,105
92,361
703.70
51,569
97,495
703.80
52,033
102,675
703.90
52,497
107,901
704.00
52,961
113,174
704.10
53,437
118,494
704.20
53,912
123,861
704.30
54,388
129,276
704.40
54,863
134,739
704.50
55,339
140,249
704.60
55,815
145,807
704.70
56,290
151,412
704.80
56,766
157,065
704.90
57,241
162,765
705.00
57,717
168,513
705.10
58,204
174,309
705.20
58,690
180,154
705.30
59,176
186,047
705.40
59,663
191,989
705.50
60,150
197,980
705.60
60,636
204,019
705.70
61,123
210,107
705.80
61,609
216,243
705.90
62,095
222,429
706.00
62,582
228,663
706.10
63,079
234,946
706.20
63,576
241,278
706.30
64,073
247,661
706.40
64,570
254,093
706.50
65,067
260,575
706.60
65,564
267,106
706.70
66,061
273,688
706.80
66,558
280,318
706.90
67,055
286,999
707.00
67,552
293,730
707.10
68,060
300,510
707.20
68,567
307,341
707.30
69,075
314,224
707.40
69,582
321,156
707.50
70,090
328,140
707.60
70,598
335,174
707.70
71,105
342,260
707.80
71,613
349,395
707.90
72,120
356,582
708.00
72.628
363.820
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.10
73,146
371,108
708.20
73,664
378,449
708.30
74,182
385,841
708.40
74,700
393,285
708.50
75,219
400,781
708.60
75,737
408,329
708.70
76,255
415,928
708.80
76,773
423,580
708.90
77,291
431,283
709.00
77,809
439,038
709.10
78,336
446,845
709.20
78,862
454,705
709.30
79,388
462,618
709.40
79,915
470,583
709.50
80,442
478,601
709.60
80,968
486,671
709.70
81,495
494,794
709.80
82,021
502,970
709.90
82,547
511,198
710.00
83,074
519,480

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 33
Summary for Pond 10P: POND 4
Inflow Area = 10.550 ac, 69.48% Impervious, Inflow Depth = 2.08" for 2yr-24hr event
Inflow = 38.86 cfs @ 11.96 hrs, Volume= 1.832 of
Outflow = 3.30 cfs @ 12.48 hrs, Volume= 1.832 af, Atten= 92%, Lag= 31.3 min
Primary = 3.30 cfs @ 12.48 hrs, Volume= 1.832 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 681.19' @ 12.48 hrs Surf.Area= 14,763 sf Storage= 36,402 cf
Plug -Flow detention time= 122.0 min calculated for 1.831 of (100% of inflow)
Center -of -Mass det. time= 123.1 min ( 935.6 - 812.5 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
120,639 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
4,560
0 0
678.00
5,909
5,235 5,235
679.00
7,780
6,845 12,079
680.00
10,667
9,224 21,303
681.00
14,076
12,372 33,674
682.00
17,710
15,893 49,567
683.00
21,571
19,641 69,208
684.00
25,659
23,615 92,823
685.00
29,973
27,816 120,639
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
677.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
682.50'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#4 Secondary
683.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=3.30 cfs @ 12.48 hrs HW=681.19' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 3.30 cfs of 29.48 cfs potential flow)
1 2=8" Orifice (Orifice Controls 3.30 cfs @ 9.45 fps)
3=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
4=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 34
'0 i gM111]A191MIZ!
Hydrograph
i
-r--r-r--r----t--I--t--I--r--I--r--r-r--r-r--r--I--r--I--t--I--r--
38.86 CfS
I----?----?--II--?--II--
I --II--
I--II---II--I---II-----II---I --II---II --
■ In
+----+----+----+----+--+-+--+-+--+----+----+----+--
1 A 1
��lO_ A .rr�-1= 1 0.550-ae
V
■Outflow
■ Primary
42
-+-
+--+--I--+--I--+--I--+--I--+--+-+--+-+--+--I--+--I--+--I--+--
G v J
■Secondary
40
I-----+--�r����.I��
-
36
-y-
y--r----+----+----rt--Ir-y--Ir-
-L--I--!
-I--!
-I--!
-I--!
-�- L-1-------1--
-�-}� r -
2cfI - -
34
'I
---
I
------------------------------$tQr_a9_�
I
I I
I I
I
I I
I I
I
Z-IJ�
--
I I I I I I I I I I
32
-+-
+--+----+----+----+----+--+-+--+-+--+-
--+----+----+--
30
-j-
---
j----j
----j
----j-
--
I--I
-j-- I--I--I --I --I I--j--I--j--
28
- -
J--L--1--1----1----L--I--
--L-L--L-J--L----L----1----L--
26
- -
--r----T----T--I--
--I
- --I
- --I - --r----r----T----7--
w24
�
- -
J--L--1--1----1----L--I--
--L-L--L-J--L----L----1----L--
22
-r-
r--r----t--I--t--I--r--r-r--r-r--r-r--r--I--r--I--t--I--r--
I
0 20
_ I_
_I--
- -
-- - -I-
- - -I-
- - -
- - -
- -
-- -I - - -I - -I -- - -I- - - -I- - --
LL 18
-1-
--+----+----+--I--
----1--+-
--r- --r----+----+----+--
16
-
-I--
--I--
--I--
--I--
-
- --I--; --I-- --I-- --I--
14
- -
--
--I--
--I--
--I--
--I--
--L-I--L-
-- --I-- --I-- --I-- --
12
- -
--r----T----T--I--
--I
- --I
- --I ---r----r----T--I-- --
10
8
��3.30 cfs
--L--1--1--1--L----L--I--
--L-
--L-L--L----L----L----L--
6
0.00
cfs
WNW
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 10P: POND 4
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.00
0
677.00
0.00
0.00
0.00
7.50
0.06
106
677.02
0.00
0.00
0.00
10.00
0.43
1,296
677.27
0.24
0.24
0.00
12.50
3.14
36,395
681.19
3.30
3.30
0.00
15.00
0.95
22,217
680.08
2.79
2.79
0.00
17.50
0.62
8,024
678.44
1.77
1.77
0.00
20.00
0.42
2,294
677.47
0.61
0.61
0.00
22.50
0.38
1,736
677.36
0.40
0.40
0.00
25.00
0.00
924
677.20
0.13
0.13
0.00
27.50
0.00
394
677.09
0.03
0.03
0.00
30.00
0.00
246
677.05
0.01
0.01
0.00
32.50
0.00
178
677.04
0.01
0.01
0.00
35.00
0.00
139
677.03
0.00
0.00
0.00
37.50
0.00
114
677.02
0.00
0.00
0.00
40.00
0.00
97
677.02
0.00
0.00
0.00
42.50
0.00
84
677.02
0.00
0.00
0.00
45.00
0.00
74
677.02
0.00
0.00
0.00
47.50
0.00
66
677.01
0.00
0.00
0.00
50.00
0.00
60
677.01
0.00
0.00
0.00
52.50
0.00
55
677.01
0.00
0.00
0.00
55.00
0.00
50
677.01
0.00
0.00
0.00
57.50
0.00
47
677.01
0.00
0.00
0.00
60.00
0.00
43
677.01
0.00
0.00
0.00
62.50
0.00
41
677.01
0.00
0.00
0.00
65.00
0.00
38
677.01
0.00
0.00
0.00
67.50
0.00
36
677.01
0.00
0.00
0.00
70.00
0.00
34
677.01
0.00
0.00
0.00
72.50
0.00
32
677.01
0.00
0.00
0.00
75.00
0.00
31
677.01
0.00
0.00
0.00
77.50
0.00
29
677.01
0.00
0.00
0.00
80.00
0.00
28
677.01
0.00
0.00
0.00
82.50
0.00
27
677.01
0.00
0.00
0.00
85.00
0.00
26
677.01
0.00
0.00
0.00
87.50
0.00
25
677.01
0.00
0.00
0.00
90.00
0.00
24
677.01
0.00
0.00
0.00
92.50
0.00
23
677.01
0.00
0.00
0.00
95.00
0.00
22
677.00
0.00
0.00
0.00
97.50
0.00
21
677.00
0.00
0.00
0.00
100.00
0.00
21
677.00
0.00
0.00
0.00
102.50
0.00
20
677.00
0.00
0.00
0.00
105.00
0.00
19
677.00
0.00
0.00
0.00
107.50
0.00
19
677.00
0.00
0.00
0.00
110.00
0.00
18
677.00
0.00
0.00
0.00
112.50
0.00
18
677.00
0.00
0.00
0.00
115.00
0.00
17
677.00
0.00
0.00
0.00
117.50
0.00
17
677.00
0.00
0.00
0.00
120.00
0.00
16
677.00
0.00
0.00
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 36
Stage -Discharge for Pond 10P: POND 4
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.13
0.13
0.00
677.30
0.28
0.28
0.00
677.40
0.47
0.47
0.00
677.50
0.68
0.68
0.00
677.60
0.87
0.87
0.00
677.70
1.02
1.02
0.00
677.80
1.15
1.15
0.00
677.90
1.27
1.27
0.00
678.00
1.37
1.37
0.00
678.10
1.47
1.47
0.00
678.20
1.56
1.56
0.00
678.30
1.65
1.65
0.00
678.40
1.74
1.74
0.00
678.50
1.82
1.82
0.00
678.60
1.89
1.89
0.00
678.70
1.96
1.96
0.00
678.80
2.04
2.04
0.00
678.90
2.10
2.10
0.00
679.00
2.17
2.17
0.00
679.10
2.23
2.23
0.00
679.20
2.30
2.30
0.00
679.30
2.36
2.36
0.00
679.40
2.42
2.42
0.00
679.50
2.47
2.47
0.00
679.60
2.53
2.53
0.00
679.70
2.59
2.59
0.00
679.80
2.64
2.64
0.00
679.90
2.69
2.69
0.00
680.00
2.74
2.74
0.00
680.10
2.80
2.80
0.00
680.20
2.85
2.85
0.00
680.30
2.89
2.89
0.00
680.40
2.94
2.94
0.00
680.50
2.99
2.99
0.00
680.60
3.04
3.04
0.00
680.70
3.08
3.08
0.00
680.80
3.13
3.13
0.00
680.90
3.17
3.17
0.00
681.00
3.22
3.22
0.00
681.10
3.26
3.26
0.00
681.20
3.30
3.30
0.00
681.30
3.35
3.35
0.00
681.40
3.39
3.39
0.00
681.50
3.43
3.43
0.00
681.60
3.47
3.47
0.00
681.70
3.51
3.51
0.00
681.80
3.55
3.55
0.00
681.90
3.59
3.59
0.00
682.00
3.63
3.63
0.00
682.10
3.67
3.67
0.00
682.20
3.71
3.71
0.00
682.30
3.75
3.75
0.00
682.40
3.78
3.78
0.00
682.50
3.82
3.82
0.00
682.60
5.51
5.51
0.00
682.70
8.57
8.57
0.00
682.80
12.53
12.53
0.00
682.90
17.20
17.20
0.00
683.00
22.50
22.50
0.00
683.10
28.35
28.35
0.00
683.20
34.71
34.71
0.00
683.30
36.77
36.77
0.00
683.40
37.08
37.08
0.00
683.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
38.48
37.70
0.79
683.70
40.22
38.00
2.23
683.80
42.45
38.30
4.15
683.90
45.07
38.60
6.48
684.00
48.19
38.89
9.30
684.10
51.73
39.18
12.55
684.20
55.26
39.47
15.78
684.30
59.01
39.76
19.25
684.40
62.97
40.05
22.92
684.50
67.13
40.33
26.80
684.60
71.59
40.62
30.98
684.70
76.26
40.90
35.36
684.80
80.90
41.18
39.72
684.90
85.68
41.45
44.23
685.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 37
Stage -Area -Storage for Pond 10P: POND 4
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
4,560
0
677.10
4,695
463
677.20
4,830
939
677.30
4,965
1,429
677.40
5,100
1,932
677.50
5,235
2,449
677.60
5,369
2,979
677.70
5,504
3,523
677.80
5,639
4,080
677.90
5,774
4,650
678.00
5,909
5,235
678.10
6,096
5,835
678.20
6,283
6,454
678.30
6,470
7,091
678.40
6,657
7,748
678.50
6,845
8,423
678.60
7,032
9,117
678.70
7,219
9,829
678.80
7,406
10,560
678.90
7,593
11,310
679.00
7,780
12,079
679.10
8,069
12,871
679.20
8,357
13,693
679.30
8,646
14,543
679.40
8,935
15,422
679.50
9,224
16,330
679.60
9,512
17,267
679.70
9,801
18,232
679.80
10,090
19,227
679.90
10,378
20,250
680.00
10,667
21,303
680.10
11,008
22,386
680.20
11,349
23,504
680.30
11,690
24,656
680.40
12,031
25,842
680.50
12,372
27,062
680.60
12,712
28,316
680.70
13,053
29,605
680.80
13,394
30,927
680.90
13,735
32,283
681.00
14,076
33,674
681.10
14,439
35,100
681.20
14,803
36,562
681.30
15,166
38,060
681.40
15,530
39,595
681.50
15,893
41,166
681.60
16,256
42,774
681.70
16,620
44,418
681.80
16,983
46,098
681.90
17,347
47,814
682.00
17,710
49,567
682.10
18,096
51,357
682.20
18,482
53,186
682.30
18,868
55,054
682.40
19,254
56,960
682.50
19,641
58,905
682.60
20,027
60,888
682.70
20,413
62,910
682.80
20,799
64,971
682.90
21,185
67,070
683.00
21,571
69,208
683.10
21,980
71,385
683.20
22,389
73,603
683.30
22,797
75,863
683.40
23,206
78,163
683.50
23.615
80.504
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
24,024
82,886
683.70
24,433
85,309
683.80
24,841
87,772
683.90
25,250
90,277
684.00
25,659
92,823
684.10
26,090
95,410
684.20
26,522
98,041
684.30
26,953
100,714
684.40
27,385
103,431
684.50
27,816
106,191
684.60
28,247
108,994
684.70
28,679
111,841
684.80
29,110
114,730
684.90
29,542
117,663
685.00
29,973
120,639

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 38
Summary for Pond 11 P: POST - OUTFALL #2
Inflow Area = 60.330 ac, 54.75% Impervious, Inflow Depth > 1.72" for 2yr-24hr event
Inflow = 8.62 cfs @ 12.22 hrs, Volume= 8.625 of
Primary = 8.62 cfs @ 12.22 hrs, Volume= 8.625 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 11 P: POST - OUTFALL #2
Hydrograph
------L--L--L--'-- ----L----L--L--L--'-- -----1--J--L--
❑ Inflow
❑ Primary
9
$.62
cfs
J14rej1=$0.330-'Iap--
IIIIIIIIIIIIIIIII�III
7-
-1 --- I- t r -I- I t r -I- t r -I- I t r -I- t
6
�- 5
I I I I I I I I I I I I I I I I I I I I
3
p
--
--------------------------------------------------------
I I I I I I I I I I I I I I I I I I I I
I I I I I I I I I I I I I I I I I I I
LL
4
3
--'
--J--L--L--'----L--L--'--J--L--L--'----L--------L--
2
- - ---L--'-- -- -- --'-- -- -- --'-- -- -
1
I I I I I I I I I I I I
0
0 5 10
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 39
Hydrograph for Pond 11 P: POST - OUTFALL #2
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.00
0.00
8.00
0.02
0.02
9.00
0.12
0.12
10.00
0.38
0.38
11.00
1.03
1.03
12.00
5.19
5.19
13.00
5.98
5.98
14.00
5.44
5.44
15.00
5.07
5.07
16.00
4.65
4.65
17.00
4.18
4.18
18.00
3.66
3.66
19.00
3.12
3.12
20.00
2.68
2.68
21.00
2.50
2.50
22.00
2.44
2.44
23.00
2.40
2.40
24.00
2.37
2.37
25.00
1.89
1.89
26.00
1.79
1.79
27.00
1.74
1.74
28.00
1.70
1.70
29.00
1.66
1.66
30.00
1.63
1.63
31.00
1.60
1.60
32.00
1.57
1.57
33.00
1.54
1.54
34.00
1.51
1.51
35.00
1.48
1.48
36.00
1.45
1.45
37.00
1.42
1.42
38.00
1.39
1.39
39.00
1.36
1.36
40.00
1.33
1.33
41.00
1.29
1.29
42.00
1.26
1.26
43.00
1.23
1.23
44.00
1.20
1.20
45.00
1.17
1.17
46.00
1.14
1.14
47.00
1.11
1.11
48.00
1.07
1.07
49.00
1.04
1.04
50.00
1.01
1.01
51.00
0.98
0.98
52.00
0.94
0.94
53.00
0.91
0.91
54.00
0.88
0.88
55.00
0.84
0.84
56.00
0.81
0.81
57.00
0.78
0.78
58.00
0.74
0.74
59.00
0.71
0.71
60.00
0.67
0.67
61.00
0.64
0.64
62.00
0.61
0.61
63.00
0.57
0.57
64.00
0.54
0.54
65.00
0.50
0.50
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.47
0.47
67.00
0.43
0.43
68.00
0.39
0.39
69.00
0.36
0.36
70.00
0.32
0.32
71.00
0.29
0.29
72.00
0.26
0.26
73.00
0.24
0.24
74.00
0.21
0.21
75.00
0.19
0.19
76.00
0.17
0.17
77.00
0.16
0.16
78.00
0.14
0.14
79.00
0.13
0.13
80.00
0.12
0.12
81.00
0.11
0.11
82.00
0.10
0.10
83.00
0.09
0.09
84.00
0.08
0.08
85.00
0.08
0.08
86.00
0.07
0.07
87.00
0.06
0.06
88.00
0.06
0.06
89.00
0.06
0.06
90.00
0.05
0.05
91.00
0.05
0.05
92.00
0.05
0.05
93.00
0.04
0.04
94.00
0.04
0.04
95.00
0.04
0.04
96.00
0.03
0.03
97.00
0.03
0.03
98.00
0.03
0.03
99.00
0.03
0.03
100.00
0.03
0.03
101.00
0.03
0.03
102.00
0.02
0.02
103.00
0.02
0.02
104.00
0.02
0.02
105.00
0.02
0.02
106.00
0.02
0.02
107.00
0.02
0.02
108.00
0.02
0.02
109.00
0.02
0.02
110.00
0.02
0.02
111.00
0.02
0.02
112.00
0.02
0.02
113.00
0.01
0.01
114.00
0.01
0.01
115.00
0.01
0.01
116.00
0.01
0.01
117.00
0.01
0.01
118.00
0.01
0.01
119.00
0.01
0.01
120.00
0.01
0.01

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 40
Summary for Pond 13P: POND 1
Inflow Area = 36.370 ac, 81.50% Impervious, Inflow Depth = 2.44" for 2yr-24hr event
Inflow = 152.25 cfs @ 11.95 hrs, Volume= 7.387 of
Outflow = 8.42 cfs @ 12.82 hrs, Volume= 7.378 af, Atten= 94%, Lag= 52.3 min
Primary = 8.42 cfs @ 12.82 hrs, Volume= 7.378 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 706.20' @ 12.82 hrs Surf.Area= 45,050 sf Storage= 182,371 cf
Plug -Flow detention time= 390.9 min calculated for 7.374 of (100% of inflow)
Center -of -Mass det. time= 392.0 min ( 1,188.3 - 796.3 )
Volume
Invert Avail.Storage Storage Description
#1
701.00'
393,227 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.00
22,606
0
0
702.00
30,532
26,569
26,569
703.00
33,334
31,933
58,502
704.00
36,378
34,856
93,358
705.00
39,732
38,055
131,413
706.00
43,988
41,860
173,273
707.00
49,187
46,588
219,861
708.00
54,818
52,003
271,863
709.00
60,624
57,721
329,584
710.00
66,662
63,643
393,227
Device Routing Invert Outlet Devices
#1 Primary 700.39' 36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 700.39' / 700.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1 701.00' 10.0" Vert. 8" Orifice C= 0.600
#3 Device 1 706.00' 36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=8.41 cfs @ 12.82 hrs HW=706.20' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 8.41 cfs of 70.69 cfs potential flow)
2=8" Orifice (Orifice Controls 5.75 cfs @ 10.54 fps)
3=Orifice/Grate (Orifice Controls 2.67 cfs @ 1.45 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 41
'0=6 1 gM10 141ii
Hydrograph
-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--
152.25 Cfs
r- r--r-r--r-
r--r-
r--r-r--r-
r--r-r-- r- r--r- r- -r-r--
IN Inflow
-�-
y__r-�--r-�--r-�--r-�--r
r---r-r-
-r-
--r-
--r---r-
--r--r-r--r---r-�--
-aafIowAt"=-39,37-Dt a-
IN Outflow
IN Primary
170
� r. r
Secondary
-r-
r--r-r--r-r--r-r--r-r--r-r--r�r--r----r-r--.fir-Syr--,fir-ram--
- Peak ]=-]eV-7'06-. 20
150
140
-,-
--r-
--r-r--r-
--r-r--r-
130
-r-
r--r-r--r-r--r-r--r-r--r-r--r-r--r--i--r-r--r-r--r-r--
120
- -
r--r-
--r-
--r-
--r-
--r-r--r-
--r--li--r- --r---r-r--
110
- -
--r-
--r-
--r-
--r-
--r-
--r-
--r--li--r- --r- --r- --
100
w
-,-
--r-
--r-
--r-
--r-r--r-
--r-
--r----r---r-,--r- --
v 90
- -
--r-
--r-
--r-
--r-
--r-
--r-
--r--li--r- --r- --r- --
0 80
-r-
r--r
-r--
r
-r--r
-r--r
-r--
r-r--
r-r--r-r--r-r--r-r--r-r--
LL 70-I--I-
- r - - r - r - -
60
-,-
--
r- r--r
- r--r
- r--r
-r--r-
--r-
-- r - ---r---r-,--r-r--
50
- -
r--r-
--r-
--r-
--r-
--r-r--r-
--r--li--r- --r---r-r--
40
- -
r--r-
--r-
--r-
--r-r--r-r--r-
--r----r---r-,--r-r--
30
8.42
Cfs
20
0.00
Cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 13P: POND 1
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.00
0.00
0.00
0.00
2.50
0.00
0
701.00
0.00
0.00
0.00
5.00
0.05
19
701.00
0.00
0.00
0.00
7.50
0.69
3,053
701.13
0.07
0.07
0.00
10.00
2.40
12,326
701.50
0.83
0.83
0.00
12.50
11.81
180,760
706.17
7.72
7.72
0.00
15.00
3.52
169,950
705.92
5.58
5.58
0.00
17.50
2.26
145,889
705.36
5.21
5.21
0.00
20.00
1.54
118,164
704.66
4.73
4.73
0.00
22.50
1.38
91,156
703.94
4.17
4.17
0.00
25.00
0.00
64,007
703.16
3.47
3.47
0.00
27.50
0.00
37,001
702.34
2.52
2.52
0.00
30.00
0.00
18,861
701.74
1.50
1.50
0.00
32.50
0.00
10,049
701.41
0.59
0.59
0.00
35.00
0.00
6,403
701.27
0.27
0.27
0.00
37.50
0.00
4,593
701.20
0.15
0.15
0.00
40.00
0.00
3,546
701.15
0.09
0.09
0.00
42.50
0.00
2,873
701.12
0.06
0.06
0.00
45.00
0.00
2,408
701.10
0.04
0.04
0.00
47.50
0.00
2,069
701.09
0.03
0.03
0.00
50.00
0.00
1,812
701.08
0.03
0.03
0.00
52.50
0.00
1,610
701.07
0.02
0.02
0.00
55.00
0.00
1,448
701.06
0.02
0.02
0.00
57.50
0.00
1,315
701.06
0.01
0.01
0.00
60.00
0.00
1,204
701.05
0.01
0.01
0.00
62.50
0.00
1,110
701.05
0.01
0.01
0.00
65.00
0.00
1,029
701.05
0.01
0.01
0.00
67.50
0.00
959
701.04
0.01
0.01
0.00
70.00
0.00
898
701.04
0.01
0.01
0.00
72.50
0.00
844
701.04
0.01
0.01
0.00
75.00
0.00
797
701.04
0.01
0.01
0.00
77.50
0.00
754
701.03
0.00
0.00
0.00
80.00
0.00
715
701.03
0.00
0.00
0.00
82.50
0.00
681
701.03
0.00
0.00
0.00
85.00
0.00
649
701.03
0.00
0.00
0.00
87.50
0.00
620
701.03
0.00
0.00
0.00
90.00
0.00
594
701.03
0.00
0.00
0.00
92.50
0.00
570
701.03
0.00
0.00
0.00
95.00
0.00
547
701.02
0.00
0.00
0.00
97.50
0.00
527
701.02
0.00
0.00
0.00
100.00
0.00
507
701.02
0.00
0.00
0.00
102.50
0.00
490
701.02
0.00
0.00
0.00
105.00
0.00
473
701.02
0.00
0.00
0.00
107.50
0.00
457
701.02
0.00
0.00
0.00
110.00
0.00
443
701.02
0.00
0.00
0.00
112.50
0.00
429
701.02
0.00
0.00
0.00
115.00
0.00
416
701.02
0.00
0.00
0.00
117.50
0.00
404
701.02
0.00
0.00
0.00
120.00
0.00
393
701.02
0.00
0.00
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 43
Stage -Discharge for Pond 13P: POND 1
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.00
0.00
0.00
0.00
701.10
0.04
0.04
0.00
701.20
0.15
0.15
0.00
701.30
0.33
0.33
0.00
701.40
0.56
0.56
0.00
701.50
0.82
0.82
0.00
701.60
1.11
1.11
0.00
701.70
1.39
1.39
0.00
701.80
1.64
1.64
0.00
701.90
1.83
1.83
0.00
702.00
2.01
2.01
0.00
702.10
2.17
2.17
0.00
702.20
2.32
2.32
0.00
702.30
2.47
2.47
0.00
702.40
2.60
2.60
0.00
702.50
2.73
2.73
0.00
702.60
2.86
2.86
0.00
702.70
2.98
2.98
0.00
702.80
3.09
3.09
0.00
702.90
3.20
3.20
0.00
703.00
3.30
3.30
0.00
703.10
3.41
3.41
0.00
703.20
3.51
3.51
0.00
703.30
3.60
3.60
0.00
703.40
3.70
3.70
0.00
703.50
3.79
3.79
0.00
703.60
3.88
3.88
0.00
703.70
3.97
3.97
0.00
703.80
4.05
4.05
0.00
703.90
4.14
4.14
0.00
704.00
4.22
4.22
0.00
704.10
4.30
4.30
0.00
704.20
4.38
4.38
0.00
704.30
4.46
4.46
0.00
704.40
4.54
4.54
0.00
704.50
4.61
4.61
0.00
704.60
4.69
4.69
0.00
704.70
4.76
4.76
0.00
704.80
4.83
4.83
0.00
704.90
4.90
4.90
0.00
705.00
4.97
4.97
0.00
705.10
5.04
5.04
0.00
705.20
5.11
5.11
0.00
705.30
5.18
5.18
0.00
705.40
5.24
5.24
0.00
705.50
5.31
5.31
0.00
705.60
5.37
5.37
0.00
705.70
5.44
5.44
0.00
705.80
5.50
5.50
0.00
705.90
5.56
5.56
0.00
706.00
5.62
5.62
0.00
706.10
6.60
6.60
0.00
706.20
8.33
8.33
0.00
706.30
10.55
10.55
0.00
706.40
13.17
13.17
0.00
706.50
16.14
16.14
0.00
706.60
19.41
19.41
0.00
706.70
22.78
22.78
0.00
706.80
25.36
25.36
0.00
706.90
27.56
27.56
0.00
707.00
29.54
29.54
0.00
707.10
31.35
31.35
0.00
707.20
33.04
33.04
0.00
707.30
34.63
34.63
0.00
707.40
36.14
36.14
0.00
707.50
37.57
37.57
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
707.60
38.95
38.95
0.00
707.70
40.27
40.27
0.00
707.80
41.55
41.55
0.00
707.90
42.78
42.78
0.00
708.00
43.97
43.97
0.00
708.10
46.79
46.79
0.00
708.20
50.94
50.94
0.00
708.30
55.95
55.95
0.00
708.40
61.66
61.66
0.00
708.50
67.97
67.97
0.00
708.60
75.60
74.81
0.79
708.70
84.36
82.14
2.23
708.80
93.62
89.47
4.15
708.90
96.59
90.11
6.48
709.00
100.05
90.75
9.30
709.10
103.94
91.39
12.55
709.20
107.80
92.02
15.78
709.30
111.90
92.65
19.25
709.40
116.20
93.27
22.92
709.50
120.69
93.89
26.80
709.60
125.48
94.50
30.98
709.70
130.48
95.12
35.36
709.80
135.45
95.72
39.72
709.90
140.55
96.33
44.23
710.00
145.70
96.93
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 44
Stage -Area -Storage for Pond 13P: POND 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.00
22,606
0
701.10
23,399
2,300
701.20
24,191
4,680
701.30
24,984
7,138
701.40
25,776
9,676
701.50
26,569
12,294
701.60
27,362
14,990
701.70
28,154
17,766
701.80
28,947
20,621
701.90
29,739
23,555
702.00
30,532
26,569
702.10
30,812
29,636
702.20
31,092
32,731
702.30
31,373
35,855
702.40
31,653
39,006
702.50
31,933
42,185
702.60
32,213
45,393
702.70
32,493
48,628
702.80
32,774
51,891
702.90
33,054
55,183
703.00
33,334
58,502
703.10
33,638
61,851
703.20
33,943
65,230
703.30
34,247
68,639
703.40
34,552
72,079
703.50
34,856
75,550
703.60
35,160
79,050
703.70
35,465
82,582
703.80
35,769
86,143
703.90
36,074
89,735
704.00
36,378
93,358
704.10
36,713
97,013
704.20
37,049
100,701
704.30
37,384
104,422
704.40
37,720
108,178
704.50
38,055
111,966
704.60
38,390
115,789
704.70
38,726
119,644
704.80
39,061
123,534
704.90
39,397
127,457
705.00
39,732
131,413
705.10
40,158
135,407
705.20
40,583
139,445
705.30
41,009
143,524
705.40
41,434
147,646
705.50
41,860
151,811
705.60
42,286
156,018
705.70
42,711
160,268
705.80
43,137
164,561
705.90
43,562
168,895
706.00
43,988
173,273
706.10
44,508
177,698
706.20
45,028
182,175
706.30
45,548
186,703
706.40
46,068
191,284
706.50
46,588
195,917
706.60
47,107
200,602
706.70
47,627
205,338
706.80
48,147
210,127
706.90
48,667
214,968
707.00
49,187
219,861
707.10
49,750
224,807
707.20
50,313
229,811
707.30
50,876
234,870
707.40
51,439
239,986
707.50
52.003
245.158
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
707.60
52,566
250,386
707.70
53,129
255,671
707.80
53,692
261,012
707.90
54,255
266,409
708.00
54,818
271,863
708.10
55,399
277,374
708.20
55,979
282,943
708.30
56,560
288,570
708.40
57,140
294,255
708.50
57,721
299,998
708.60
58,302
305,799
708.70
58,882
311,658
708.80
59,463
317,575
708.90
60,043
323,551
709.00
60,624
329,584
709.10
61,228
335,677
709.20
61,832
341,830
709.30
62,435
348,043
709.40
63,039
354,317
709.50
63,643
360,651
709.60
64,247
367,045
709.70
64,851
373,500
709.80
65,454
380,015
709.90
66,058
386,591
710.00
66,662
393,227

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 45
Summary for Pond 15P: POND 6
Inflow Area = 13.860 ac, 74.39% Impervious, Inflow Depth = 2.26" for 2yr-24hr event
Inflow = 54.59 cfs @ 11.95 hrs, Volume= 2.605 of
Outflow = 3.34 cfs @ 12.70 hrs, Volume= 2.593 af, Atten= 94%, Lag= 45.0 min
Primary = 3.34 cfs @ 12.70 hrs, Volume= 2.593 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 679.04' @ 12.70 hrs Surf.Area= 33,770 sf Storage= 62,282 cf
Plug -Flow detention time= 311.6 min calculated for 2.592 of (99% of inflow)
Center -of -Mass det. time= 310.9 min ( 1,115.7 - 804.8 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
270,951 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
27,493
0 0
678.00
30,495
28,994 28,994
679.00
33,652
32,074 61,068
680.00
36,914
35,283 96,351
681.00
40,232
38,573 134,924
682.00
43,608
41,920 176,844
683.00
47,039
45,324 222,167
684.00
50,528
48,784 270,951
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1
677.00'
10.0" Vert. 8" Orifice C= 0.600
#3 Device 1
680.00'
36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
682.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
682.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=3.34 cfs @ 12.70 hrs HW=679.04' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 3.34 cfs of 29.64 cfs potential flow)
2=8" Orifice (Orifice Controls 3.34 cfs @ 6.13 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 46
'0=6 1 gmMR097ki1•I:
.....
•.. ' 1
• •,
•
'///%//////%//////////////////////////////////////////////////////////////////////0
/////////////////////////////////////////////////////////////////////////

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 15P: POND 6
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.00
0
677.00
0.00
0.00
0.00
7.50
0.16
513
677.02
0.00
0.00
0.00
10.00
0.73
3,811
677.14
0.07
0.07
0.00
12.50
4.32
62,023
679.03
3.33
3.33
0.00
15.00
1.30
51,766
678.72
3.00
3.00
0.00
17.50
0.84
36,539
678.24
2.39
2.39
0.00
20.00
0.57
24,345
677.85
1.72
1.72
0.00
22.50
0.51
16,706
677.59
1.08
1.08
0.00
25.00
0.00
11,816
677.42
0.61
0.61
0.00
27.50
0.00
7,953
677.28
0.30
0.30
0.00
30.00
0.00
5,907
677.21
0.17
0.17
0.00
32.50
0.00
4,669
677.17
0.11
0.11
0.00
35.00
0.00
3,847
677.14
0.08
0.08
0.00
37.50
0.00
3,265
677.12
0.06
0.06
0.00
40.00
0.00
2,832
677.10
0.04
0.04
0.00
42.50
0.00
2,499
677.09
0.03
0.03
0.00
45.00
0.00
2,234
677.08
0.03
0.03
0.00
47.50
0.00
2,020
677.07
0.02
0.02
0.00
50.00
0.00
1,842
677.07
0.02
0.02
0.00
52.50
0.00
1,693
677.06
0.02
0.02
0.00
55.00
0.00
1,566
677.06
0.01
0.01
0.00
57.50
0.00
1,456
677.05
0.01
0.01
0.00
60.00
0.00
1,361
677.05
0.01
0.01
0.00
62.50
0.00
1,277
677.05
0.01
0.01
0.00
65.00
0.00
1,203
677.04
0.01
0.01
0.00
67.50
0.00
1,137
677.04
0.01
0.01
0.00
70.00
0.00
1,077
677.04
0.01
0.01
0.00
72.50
0.00
1,024
677.04
0.01
0.01
0.00
75.00
0.00
975
677.04
0.01
0.01
0.00
77.50
0.00
931
677.03
0.00
0.00
0.00
80.00
0.00
891
677.03
0.00
0.00
0.00
82.50
0.00
854
677.03
0.00
0.00
0.00
85.00
0.00
820
677.03
0.00
0.00
0.00
87.50
0.00
789
677.03
0.00
0.00
0.00
90.00
0.00
759
677.03
0.00
0.00
0.00
92.50
0.00
732
677.03
0.00
0.00
0.00
95.00
0.00
707
677.03
0.00
0.00
0.00
97.50
0.00
683
677.02
0.00
0.00
0.00
100.00
0.00
661
677.02
0.00
0.00
0.00
102.50
0.00
641
677.02
0.00
0.00
0.00
105.00
0.00
621
677.02
0.00
0.00
0.00
107.50
0.00
603
677.02
0.00
0.00
0.00
110.00
0.00
586
677.02
0.00
0.00
0.00
112.50
0.00
569
677.02
0.00
0.00
0.00
115.00
0.00
554
677.02
0.00
0.00
0.00
117.50
0.00
539
677.02
0.00
0.00
0.00
120.00
0.00
526
677.02
0.00
0.00
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 48
Stage -Discharge for Pond 15P: POND 6
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.15
0.15
0.00
677.30
0.33
0.33
0.00
677.40
0.56
0.56
0.00
677.50
0.82
0.82
0.00
677.60
1.11
1.11
0.00
677.70
1.39
1.39
0.00
677.80
1.64
1.64
0.00
677.90
1.83
1.83
0.00
678.00
2.01
2.01
0.00
678.10
2.17
2.17
0.00
678.20
2.32
2.32
0.00
678.30
2.47
2.47
0.00
678.40
2.60
2.60
0.00
678.50
2.73
2.73
0.00
678.60
2.86
2.86
0.00
678.70
2.98
2.98
0.00
678.80
3.09
3.09
0.00
678.90
3.20
3.20
0.00
679.00
3.30
3.30
0.00
679.10
3.41
3.41
0.00
679.20
3.51
3.51
0.00
679.30
3.60
3.60
0.00
679.40
3.70
3.70
0.00
679.50
3.79
3.79
0.00
679.60
3.88
3.88
0.00
679.70
3.97
3.97
0.00
679.80
4.05
4.05
0.00
679.90
4.14
4.14
0.00
680.00
4.22
4.22
0.00
680.10
5.22
5.22
0.00
680.20
6.97
6.97
0.00
680.30
9.21
9.21
0.00
680.40
11.84
11.84
0.00
680.50
14.83
14.83
0.00
680.60
18.11
18.11
0.00
680.70
21.50
21.50
0.00
680.80
24.10
24.10
0.00
680.90
26.31
26.31
0.00
681.00
28.30
28.30
0.00
681.10
30.13
30.13
0.00
681.20
31.83
31.83
0.00
681.30
33.44
33.44
0.00
681.40
34.95
34.95
0.00
681.50
36.40
36.40
0.00
681.60
37.79
37.79
0.00
681.70
39.12
39.12
0.00
681.80
40.41
40.41
0.00
681.90
41.65
41.65
0.00
682.00
42.86
42.86
0.00
682.10
45.68
45.68
0.00
682.20
49.84
49.84
0.00
682.30
54.87
54.87
0.00
682.40
60.59
60.59
0.00
682.50
66.90
66.90
0.00
682.60
74.54
73.75
0.79
682.70
76.87
74.64
2.23
682.80
79.57
75.42
4.15
682.90
82.66
76.18
6.48
683.00
86.24
76.94
9.30
683.10
90.23
77.69
12.55
683.20
94.21
78.43
15.78
683.30
98.41
79.16
19.25
683.40
102.82
79.89
22.92
683.50
107.41
80.61
26.80
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
112.31
81.33
30.98
683.70
117.40
82.04
35.36
683.80
122.46
82.74
39.72
683.90
127.67
83.44
44.23
684.00
132.90
84.13
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 49
Stage -Area -Storage for Pond 15P: POND 6
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
27,493
0
677.10
27,793
2,764
677.20
28,093
5,559
677.30
28,394
8,383
677.40
28,694
11,237
677.50
28,994
14,122
677.60
29,294
17,036
677.70
29,594
19,981
677.80
29,895
22,955
677.90
30,195
25,960
678.00
30,495
28,994
678.10
30,811
32,059
678.20
31,126
35,156
678.30
31,442
38,285
678.40
31,758
41,445
678.50
32,074
44,636
678.60
32,389
47,859
678.70
32,705
51,114
678.80
33,021
54,400
678.90
33,336
57,718
679.00
33,652
61,068
679.10
33,978
64,449
679.20
34,304
67,863
679.30
34,631
71,310
679.40
34,957
74,789
679.50
35,283
78,301
679.60
35,609
81,846
679.70
35,935
85,423
679.80
36,262
89,033
679.90
36,588
92,675
680.00
36,914
96,351
680.10
37,246
100,058
680.20
37,578
103,800
680.30
37,909
107,574
680.40
38,241
111,382
680.50
38,573
115,222
680.60
38,905
119,096
680.70
39,237
123,003
680.80
39,568
126,943
680.90
39,900
130,917
681.00
40,232
134,924
681.10
40,570
138,964
681.20
40,907
143,037
681.30
41,245
147,145
681.40
41,582
151,286
681.50
41,920
155,462
681.60
42,258
159,670
681.70
42,595
163,913
681.80
42,933
168,189
681.90
43,270
172,500
682.00
43,608
176,844
682.10
43,951
181,221
682.20
44,294
185,634
682.30
44,637
190,080
682.40
44,980
194,561
682.50
45,324
199,076
682.60
45,667
203,626
682.70
46,010
208,210
682.80
46,353
212,828
682.90
46,696
217,480
683.00
47,039
222,167
683.10
47,388
226,888
683.20
47,737
231,645
683.30
48,086
236,436
683.40
48,435
241,262
683.50
48.784
246.123
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
49,132
251,018
683.70
49,481
255,949
683.80
49,830
260,915
683.90
50,179
265,915
684.00
50,528
270,951

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 50
Summary for Pond 18P: POST - OUTFALL #1
Inflow Area = 48.760 ac, 68.58% Impervious, Inflow Depth = 2.08" for 2yr-24hr event
Inflow = 27.83 cfs @ 11.97 hrs, Volume= 8.461 of
Primary = 27.83 cfs @ 11.97 hrs, Volume= 8.461 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 18P: POST - OUTFALL #1
Hydrograph
❑ Inflow
30
27.83
cfs
--Y---------Y-------Y--Y-Irrfloy�r- 4r',e�=48 7-$ -af-
❑ Primary
28
26
,I
I
I
1__ L--L_-I__
I I I I I I I I I I I I I I I I I I I I I
24
--
-7--r--r--I-- --r-- --I-- --r-- --r---T--r-----I-- --r-- --I--
22
'I
I I I I I I I I I I
20
y 18
U
" 16
__
1__L__I--- __ 1__L__I___I__1__L__L__I__
0 14
LL
12
+__L-------L--L__-----J--L____----L--L-------L--L----I--
g
2
0
0 5
10
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 51
Hydrograph for Pond 18P: POST - OUTFALL #1
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.03
0.03
8.00
0.13
0.13
9.00
0.37
0.37
10.00
0.83
0.83
11.00
1.65
1.65
12.00
26.16
26.16
13.00
9.76
9.76
14.00
7.15
7.15
15.00
6.32
6.32
16.00
6.04
6.04
17.00
5.82
5.82
18.00
5.60
5.60
19.00
5.35
5.35
20.00
5.08
5.08
21.00
4.84
4.84
22.00
4.61
4.61
23.00
4.37
4.37
24.00
4.12
4.12
25.00
3.47
3.47
26.00
3.10
3.10
27.00
2.71
2.71
28.00
2.32
2.32
29.00
1.92
1.92
30.00
1.50
1.50
31.00
1.04
1.04
32.00
0.71
0.71
33.00
0.50
0.50
34.00
0.36
0.36
35.00
0.27
0.27
36.00
0.21
0.21
37.00
0.17
0.17
38.00
0.13
0.13
39.00
0.11
0.11
40.00
0.09
0.09
41.00
0.08
0.08
42.00
0.07
0.07
43.00
0.06
0.06
44.00
0.05
0.05
45.00
0.04
0.04
46.00
0.04
0.04
47.00
0.03
0.03
48.00
0.03
0.03
49.00
0.03
0.03
50.00
0.03
0.03
51.00
0.02
0.02
52.00
0.02
0.02
53.00
0.02
0.02
54.00
0.02
0.02
55.00
0.02
0.02
56.00
0.02
0.02
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.01
0.01
75.00
0.01
0.01
76.00
0.00
0.00
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 52
Summary for Pond 21 P: POST - OUTFALL #3
Inflow Area = 17.630 ac, 58.48% Impervious, Inflow Depth > 1.86" for 2yr-24hr event
Inflow = 4.37 cfs @ 12.22 hrs, Volume= 2.734 of
Primary = 4.37 cfs @ 12.22 hrs, Volume= 2.734 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
w
u
3
0
LL
Pond 21 P: POST - OUTFALL #3
Hydrograph
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)
❑ Inflow
❑ Primary

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 53
Hydrograph for Pond 21 P: POST - OUTFALL #3
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.00
0.00
8.00
0.00
0.00
9.00
0.02
0.02
10.00
0.07
0.07
11.00
0.26
0.26
12.00
3.13
3.13
13.00
3.61
3.61
14.00
3.37
3.37
15.00
3.13
3.13
16.00
2.88
2.88
17.00
2.61
2.61
18.00
2.35
2.35
19.00
2.07
2.07
20.00
1.79
1.79
21.00
1.51
1.51
22.00
1.24
1.24
23.00
1.04
1.04
24.00
0.89
0.89
25.00
0.61
0.61
26.00
0.45
0.45
27.00
0.34
0.34
28.00
0.27
0.27
29.00
0.21
0.21
30.00
0.17
0.17
31.00
0.14
0.14
32.00
0.12
0.12
33.00
0.10
0.10
34.00
0.09
0.09
35.00
0.08
0.08
36.00
0.07
0.07
37.00
0.06
0.06
38.00
0.05
0.05
39.00
0.05
0.05
40.00
0.04
0.04
41.00
0.04
0.04
42.00
0.03
0.03
43.00
0.03
0.03
44.00
0.03
0.03
45.00
0.03
0.03
46.00
0.02
0.02
47.00
0.02
0.02
48.00
0.02
0.02
49.00
0.02
0.02
50.00
0.02
0.02
51.00
0.02
0.02
52.00
0.02
0.02
53.00
0.01
0.01
54.00
0.01
0.01
55.00
0.01
0.01
56.00
0.01
0.01
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.01
0.01
75.00
0.01
0.01
76.00
0.00
0.00
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
10-YEAR, 24-HOUR STORM EVENT

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Summary for Subcatchment 3S: POST TO POND 2
Runoff = 122.86 cfs @ 11.95 hrs, Volume= 5.988 af, Depth= 3.63"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN
Description
14.690 98
Impervious
5.100 61
>75% Grass cover, Good, HSG B
19.790 88
Weighted Average
5.100
25.77% Pervious Area
14.690
74.23% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 3S: POST TO POND 2
Hydrograph
II
--I
- -- - t - - t - - t - - t - - + - - - - t - - - - t - - t - - - - - - - - - - t - - t - - t - - - - - - - - - - t - - t - - Runoff
130 122.86 Cfs
--r--r--r----,-=,--r--r--I -
r---;PQ11;24--120 h,r
-
110 ' yrana�.91--
I
100 I I I I I I I I I I I I I I I I � 7V i11
90
w $070- I I I I I I I I I I I I I I I IthI
S
w --I----+--+--+--+----+----+--+-------Runoff �Dep�-6T1
I
LL 60 - -----t--Ii-----i-- ---- --Ii-----i-- -- r----1�cT5:�0-�nii� -
-------------------
50 PN=88
40
30
-I-- +--+--+--r--+--I--+--+--+--+--I---I---I--+--+--+--I---I---I--+--+--
20
--r �--�--r--r--r--I--r--�--r--r--r--I---I--�--r--r--r--r--I--�--r--
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Hydrograph for Subcatchment 3S: POST TO POND 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.07
6.00
0.40
0.01
0.27
7.00
0.49
0.03
0.49
8.00
0.60
0.06
0.73
9.00
0.73
0.11
1.33
10.00
0.90
0.20
2.01
11.00
1.17
0.35
4.27
12.00
3.29
2.08
104.27
13.00
3.83
2.57
5.94
14.00
4.07
2.79
3.55
15.00
4.23
2.95
2.82
16.00
4.36
3.07
2.18
17.00
4.47
3.17
1.92
18.00
4.57
3.26
1.70
19.00
4.65
3.34
1.47
20.00
4.72
3.41
1.23
21.00
4.79
3.47
1.17
22.00
4.85
3.52
1.13
23.00
4.90
3.58
1.08
24.00
4.96
3.63
1.03
25.00
4.96
3.63
0.00
26.00
4.96
3.63
0.00
27.00
4.96
3.63
0.00
28.00
4.96
3.63
0.00
29.00
4.96
3.63
0.00
30.00
4.96
3.63
0.00
31.00
4.96
3.63
0.00
32.00
4.96
3.63
0.00
33.00
4.96
3.63
0.00
34.00
4.96
3.63
0.00
35.00
4.96
3.63
0.00
36.00
4.96
3.63
0.00
37.00
4.96
3.63
0.00
38.00
4.96
3.63
0.00
39.00
4.96
3.63
0.00
40.00
4.96
3.63
0.00
41.00
4.96
3.63
0.00
42.00
4.96
3.63
0.00
43.00
4.96
3.63
0.00
44.00
4.96
3.63
0.00
45.00
4.96
3.63
0.00
46.00
4.96
3.63
0.00
47.00
4.96
3.63
0.00
48.00
4.96
3.63
0.00
49.00
4.96
3.63
0.00
50.00
4.96
3.63
0.00
51.00
4.96
3.63
0.00
52.00
4.96
3.63
0.00
53.00
4.96
3.63
0.00
54.00
4.96
3.63
0.00
55.00
4.96
3.63
0.00
56.00
4.96
3.63
0.00
57.00
4.96
3.63
0.00
58.00
4.96
3.63
0.00
59.00
4.96
3.63
0.00
60.00
4.96
3.63
0.00
61.00
4.96
3.63
0.00
62.00
4.96
3.63
0.00
63.00
4.96
3.63
0.00
64.00
4.96
3.63
0.00
65.00
4.96
3.63
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.63
0.00
67.00
4.96
3.63
0.00
68.00
4.96
3.63
0.00
69.00
4.96
3.63
0.00
70.00
4.96
3.63
0.00
71.00
4.96
3.63
0.00
72.00
4.96
3.63
0.00
73.00
4.96
3.63
0.00
74.00
4.96
3.63
0.00
75.00
4.96
3.63
0.00
76.00
4.96
3.63
0.00
77.00
4.96
3.63
0.00
78.00
4.96
3.63
0.00
79.00
4.96
3.63
0.00
80.00
4.96
3.63
0.00
81.00
4.96
3.63
0.00
82.00
4.96
3.63
0.00
83.00
4.96
3.63
0.00
84.00
4.96
3.63
0.00
85.00
4.96
3.63
0.00
86.00
4.96
3.63
0.00
87.00
4.96
3.63
0.00
88.00
4.96
3.63
0.00
89.00
4.96
3.63
0.00
90.00
4.96
3.63
0.00
91.00
4.96
3.63
0.00
92.00
4.96
3.63
0.00
93.00
4.96
3.63
0.00
94.00
4.96
3.63
0.00
95.00
4.96
3.63
0.00
96.00
4.96
3.63
0.00
97.00
4.96
3.63
0.00
98.00
4.96
3.63
0.00
99.00
4.96
3.63
0.00
100.00
4.96
3.63
0.00
101.00
4.96
3.63
0.00
102.00
4.96
3.63
0.00
103.00
4.96
3.63
0.00
104.00
4.96
3.63
0.00
105.00
4.96
3.63
0.00
106.00
4.96
3.63
0.00
107.00
4.96
3.63
0.00
108.00
4.96
3.63
0.00
109.00
4.96
3.63
0.00
110.00
4.96
3.63
0.00
111.00
4.96
3.63
0.00
112.00
4.96
3.63
0.00
113.00
4.96
3.63
0.00
114.00
4.96
3.63
0.00
115.00
4.96
3.63
0.00
116.00
4.96
3.63
0.00
117.00
4.96
3.63
0.00
118.00
4.96
3.63
0.00
119.00
4.96
3.63
0.00
120.00
4.96
3.63
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 3
Summary for Subcatchment 4S: PRE (OUTFALL #1)
Runoff = 101.03 cfs @ 12.16 hrs, Volume= 8.084 af, Depth= 2.25"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
9.130 55 Woods, Good, HSG B
34.000 78 Row crops, straight row, Good, HSG B
43.130 73 Weighted Average
43.130 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 4S: PRE (OUTFALL #1)
Hydrograph
-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Hydrograph for Subcatchment 4S: PRE (OUTFALL #1)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.01
0.38
11.00
1.17
0.04
1.95
12.00
3.29
1.04
59.86
13.00
3.83
1.41
12.61
14.00
4.07
1.58
6.80
15.00
4.23
1.70
5.11
16.00
4.36
1.79
4.06
17.00
4.47
1.88
3.45
18.00
4.57
1.95
3.08
19.00
4.65
2.01
2.69
20.00
4.72
2.06
2.29
21.00
4.79
2.11
2.11
22.00
4.85
2.16
2.03
23.00
4.90
2.21
1.96
24.00
4.96
2.25
1.88
25.00
4.96
2.25
0.01
26.00
4.96
2.25
0.00
27.00
4.96
2.25
0.00
28.00
4.96
2.25
0.00
29.00
4.96
2.25
0.00
30.00
4.96
2.25
0.00
31.00
4.96
2.25
0.00
32.00
4.96
2.25
0.00
33.00
4.96
2.25
0.00
34.00
4.96
2.25
0.00
35.00
4.96
2.25
0.00
36.00
4.96
2.25
0.00
37.00
4.96
2.25
0.00
38.00
4.96
2.25
0.00
39.00
4.96
2.25
0.00
40.00
4.96
2.25
0.00
41.00
4.96
2.25
0.00
42.00
4.96
2.25
0.00
43.00
4.96
2.25
0.00
44.00
4.96
2.25
0.00
45.00
4.96
2.25
0.00
46.00
4.96
2.25
0.00
47.00
4.96
2.25
0.00
48.00
4.96
2.25
0.00
49.00
4.96
2.25
0.00
50.00
4.96
2.25
0.00
51.00
4.96
2.25
0.00
52.00
4.96
2.25
0.00
53.00
4.96
2.25
0.00
54.00
4.96
2.25
0.00
55.00
4.96
2.25
0.00
56.00
4.96
2.25
0.00
57.00
4.96
2.25
0.00
58.00
4.96
2.25
0.00
59.00
4.96
2.25
0.00
60.00
4.96
2.25
0.00
61.00
4.96
2.25
0.00
62.00
4.96
2.25
0.00
63.00
4.96
2.25
0.00
64.00
4.96
2.25
0.00
65.00
4.96
2.25
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
2.25
0.00
67.00
4.96
2.25
0.00
68.00
4.96
2.25
0.00
69.00
4.96
2.25
0.00
70.00
4.96
2.25
0.00
71.00
4.96
2.25
0.00
72.00
4.96
2.25
0.00
73.00
4.96
2.25
0.00
74.00
4.96
2.25
0.00
75.00
4.96
2.25
0.00
76.00
4.96
2.25
0.00
77.00
4.96
2.25
0.00
78.00
4.96
2.25
0.00
79.00
4.96
2.25
0.00
80.00
4.96
2.25
0.00
81.00
4.96
2.25
0.00
82.00
4.96
2.25
0.00
83.00
4.96
2.25
0.00
84.00
4.96
2.25
0.00
85.00
4.96
2.25
0.00
86.00
4.96
2.25
0.00
87.00
4.96
2.25
0.00
88.00
4.96
2.25
0.00
89.00
4.96
2.25
0.00
90.00
4.96
2.25
0.00
91.00
4.96
2.25
0.00
92.00
4.96
2.25
0.00
93.00
4.96
2.25
0.00
94.00
4.96
2.25
0.00
95.00
4.96
2.25
0.00
96.00
4.96
2.25
0.00
97.00
4.96
2.25
0.00
98.00
4.96
2.25
0.00
99.00
4.96
2.25
0.00
100.00
4.96
2.25
0.00
101.00
4.96
2.25
0.00
102.00
4.96
2.25
0.00
103.00
4.96
2.25
0.00
104.00
4.96
2.25
0.00
105.00
4.96
2.25
0.00
106.00
4.96
2.25
0.00
107.00
4.96
2.25
0.00
108.00
4.96
2.25
0.00
109.00
4.96
2.25
0.00
110.00
4.96
2.25
0.00
111.00
4.96
2.25
0.00
112.00
4.96
2.25
0.00
113.00
4.96
2.25
0.00
114.00
4.96
2.25
0.00
115.00
4.96
2.25
0.00
116.00
4.96
2.25
0.00
117.00
4.96
2.25
0.00
118.00
4.96
2.25
0.00
119.00
4.96
2.25
0.00
120.00
4.96
2.25
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Summary for Subcatchment 5S: PRE (OUTFALL #2)
Runoff = 140.95 cfs @ 12.15 hrs, Volume= 11.246 af, Depth= 2.33"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
10.200 55 Woods, Good, HSG B
47.660 78 Row crops, straight row, Good, HSG B
57.860 74 Weighted Average
57.860 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 5S: PRE (OUTFALL #2)
Hydrograph
-----------,--,--,----------
-,---,-- ■Runoff
150140.95 cfs 1-------- -- -- -- ----------- -- ------------ -- --
130 lbyj--2 F11;1 C�ir, f-aH-=4496" _
--I-- +--+--+--+--+----+--+--+--+--I-
120
-
-------------------------------
110 n d ��ear arc
------+--+ - - + - - I + - - I- - 4 - - + - -
1007 Ru'Indff Vdlufn6=111.246 elf
w
90
--I----rt--t--r--'r--I-- ----t--r-----I-- r � r3';
N '��aff Dept-12:I�"-
3
80
-- - - - -- -- -- - - ---If �w �ePgth=1; F-
LL 70
---- PPYY11 P1
60--1--i--L--IL----J--1--1--L--------'-- --i-- ��- -� �� S!■��! -
50 � J y�
--r- r-
-r--r--r--r--i--r--r--r--r--r--r--i--r--r--r- -r--r- r=F7"F-
40 1 - - L - - L - -' - - L - - 1 - - 1 - - L - -'- - -'- - -' - - 1 - - 1 - - L - -'- - -'- - -' - - 1 - - 1 - -
30
-
-r---T--r--r--+------T- -T--r T- -T- -r T--T--
20
--I-- +--+--+--+--+--I--+--+--+--+--I---I---I--+--+--+--I---I---I--+--+--
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Hydrograph for Subcatchment 5S: PRE (OUTFALL #2)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.01
0.73
11.00
1.17
0.05
3.01
12.00
3.29
1.10
84.41
13.00
3.83
1.47
17.35
14.00
4.07
1.65
9.33
15.00
4.23
1.77
7.00
16.00
4.36
1.87
5.56
17.00
4.47
1.95
4.73
18.00
4.57
2.02
4.21
19.00
4.65
2.09
3.67
20.00
4.72
2.14
3.13
21.00
4.79
2.19
2.88
22.00
4.85
2.24
2.78
23.00
4.90
2.29
2.67
24.00
4.96
2.33
2.57
25.00
4.96
2.33
0.01
26.00
4.96
2.33
0.00
27.00
4.96
2.33
0.00
28.00
4.96
2.33
0.00
29.00
4.96
2.33
0.00
30.00
4.96
2.33
0.00
31.00
4.96
2.33
0.00
32.00
4.96
2.33
0.00
33.00
4.96
2.33
0.00
34.00
4.96
2.33
0.00
35.00
4.96
2.33
0.00
36.00
4.96
2.33
0.00
37.00
4.96
2.33
0.00
38.00
4.96
2.33
0.00
39.00
4.96
2.33
0.00
40.00
4.96
2.33
0.00
41.00
4.96
2.33
0.00
42.00
4.96
2.33
0.00
43.00
4.96
2.33
0.00
44.00
4.96
2.33
0.00
45.00
4.96
2.33
0.00
46.00
4.96
2.33
0.00
47.00
4.96
2.33
0.00
48.00
4.96
2.33
0.00
49.00
4.96
2.33
0.00
50.00
4.96
2.33
0.00
51.00
4.96
2.33
0.00
52.00
4.96
2.33
0.00
53.00
4.96
2.33
0.00
54.00
4.96
2.33
0.00
55.00
4.96
2.33
0.00
56.00
4.96
2.33
0.00
57.00
4.96
2.33
0.00
58.00
4.96
2.33
0.00
59.00
4.96
2.33
0.00
60.00
4.96
2.33
0.00
61.00
4.96
2.33
0.00
62.00
4.96
2.33
0.00
63.00
4.96
2.33
0.00
64.00
4.96
2.33
0.00
65.00
4.96
2.33
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
2.33
0.00
67.00
4.96
2.33
0.00
68.00
4.96
2.33
0.00
69.00
4.96
2.33
0.00
70.00
4.96
2.33
0.00
71.00
4.96
2.33
0.00
72.00
4.96
2.33
0.00
73.00
4.96
2.33
0.00
74.00
4.96
2.33
0.00
75.00
4.96
2.33
0.00
76.00
4.96
2.33
0.00
77.00
4.96
2.33
0.00
78.00
4.96
2.33
0.00
79.00
4.96
2.33
0.00
80.00
4.96
2.33
0.00
81.00
4.96
2.33
0.00
82.00
4.96
2.33
0.00
83.00
4.96
2.33
0.00
84.00
4.96
2.33
0.00
85.00
4.96
2.33
0.00
86.00
4.96
2.33
0.00
87.00
4.96
2.33
0.00
88.00
4.96
2.33
0.00
89.00
4.96
2.33
0.00
90.00
4.96
2.33
0.00
91.00
4.96
2.33
0.00
92.00
4.96
2.33
0.00
93.00
4.96
2.33
0.00
94.00
4.96
2.33
0.00
95.00
4.96
2.33
0.00
96.00
4.96
2.33
0.00
97.00
4.96
2.33
0.00
98.00
4.96
2.33
0.00
99.00
4.96
2.33
0.00
100.00
4.96
2.33
0.00
101.00
4.96
2.33
0.00
102.00
4.96
2.33
0.00
103.00
4.96
2.33
0.00
104.00
4.96
2.33
0.00
105.00
4.96
2.33
0.00
106.00
4.96
2.33
0.00
107.00
4.96
2.33
0.00
108.00
4.96
2.33
0.00
109.00
4.96
2.33
0.00
110.00
4.96
2.33
0.00
111.00
4.96
2.33
0.00
112.00
4.96
2.33
0.00
113.00
4.96
2.33
0.00
114.00
4.96
2.33
0.00
115.00
4.96
2.33
0.00
116.00
4.96
2.33
0.00
117.00
4.96
2.33
0.00
118.00
4.96
2.33
0.00
119.00
4.96
2.33
0.00
120.00
4.96
2.33
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 7
Summary for Subcatchment 6S: PRE (OUTFALL #3)
Runoff = 34.97 cfs @ 12.16 hrs, Volume= 2.798 af, Depth= 2.25"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
3.190 55 Woods, Good, HSG B
11.740 78 Row crops, straight row, Good, HSG B
14.930 73 Weighted Average
14.930 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 6S: PRE (OUTFALL #3)
Hydrograph
38
36
34
--I-
I-
--I--t--t--t--r--t-------t--t--t--t--t--r--t--I--t--t--t--t--r--
cfs
--- t-- t--r--r-- --t--t--r--�---�---�--�--rt--rt--�--r--r--�---�--t--�--t--r--r--
t-------t--t--t--r--r--r--t----t--tt--7-- r--
---,--7--r--r----------T--T--T--T--T--T----- �T�pO-�T���b�� -
■Runoff
34.97
----
--��--
32
30-
--�--
--- ----T--T------------rt--'t0yrTlOrRai nfa ll--4.96�"'
28
'
----
---T--T--T--T------------T--T-RLthoff Ar6& 14.930-at -
26
24
----
r r
---,--T--t--7-------I-- ----�nPff-VPI�-m'e=2. � -a�f--
w 22
-U 20
-
--��--
----
---,--T--T--T----------------T-- �. ��4-
Run�#�DupthT2.25� --
--T--t--7--7------- -- -- --t-FIbW
16
14
----
--
-T-- T--T--T---------T--T--T--T--T�I---
12
I
I I I I I I I I I I I I I
1 -1 T - - T - - 7 - - � - - - - - - - 7 - - 7 - - 7 - - T - - 7 - - 7 - - I - - - - - 7 - - 7 - � N = 7 a -
10
--�--
-------� --�----------------� --� ------------------------
8
----
---
6
----
--- -- -- --------------- -- -- --------------- -- -- -----
4
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 8
Hydrograph for Subcatchment 6S: PRE (OUTFALL #3)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.01
0.13
11.00
1.17
0.04
0.68
12.00
3.29
1.04
20.72
13.00
3.83
1.41
4.37
14.00
4.07
1.58
2.35
15.00
4.23
1.70
1.77
16.00
4.36
1.79
1.41
17.00
4.47
1.88
1.20
18.00
4.57
1.95
1.06
19.00
4.65
2.01
0.93
20.00
4.72
2.06
0.79
21.00
4.79
2.11
0.73
22.00
4.85
2.16
0.70
23.00
4.90
2.21
0.68
24.00
4.96
2.25
0.65
25.00
4.96
2.25
0.00
26.00
4.96
2.25
0.00
27.00
4.96
2.25
0.00
28.00
4.96
2.25
0.00
29.00
4.96
2.25
0.00
30.00
4.96
2.25
0.00
31.00
4.96
2.25
0.00
32.00
4.96
2.25
0.00
33.00
4.96
2.25
0.00
34.00
4.96
2.25
0.00
35.00
4.96
2.25
0.00
36.00
4.96
2.25
0.00
37.00
4.96
2.25
0.00
38.00
4.96
2.25
0.00
39.00
4.96
2.25
0.00
40.00
4.96
2.25
0.00
41.00
4.96
2.25
0.00
42.00
4.96
2.25
0.00
43.00
4.96
2.25
0.00
44.00
4.96
2.25
0.00
45.00
4.96
2.25
0.00
46.00
4.96
2.25
0.00
47.00
4.96
2.25
0.00
48.00
4.96
2.25
0.00
49.00
4.96
2.25
0.00
50.00
4.96
2.25
0.00
51.00
4.96
2.25
0.00
52.00
4.96
2.25
0.00
53.00
4.96
2.25
0.00
54.00
4.96
2.25
0.00
55.00
4.96
2.25
0.00
56.00
4.96
2.25
0.00
57.00
4.96
2.25
0.00
58.00
4.96
2.25
0.00
59.00
4.96
2.25
0.00
60.00
4.96
2.25
0.00
61.00
4.96
2.25
0.00
62.00
4.96
2.25
0.00
63.00
4.96
2.25
0.00
64.00
4.96
2.25
0.00
65.00
4.96
2.25
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
2.25
0.00
67.00
4.96
2.25
0.00
68.00
4.96
2.25
0.00
69.00
4.96
2.25
0.00
70.00
4.96
2.25
0.00
71.00
4.96
2.25
0.00
72.00
4.96
2.25
0.00
73.00
4.96
2.25
0.00
74.00
4.96
2.25
0.00
75.00
4.96
2.25
0.00
76.00
4.96
2.25
0.00
77.00
4.96
2.25
0.00
78.00
4.96
2.25
0.00
79.00
4.96
2.25
0.00
80.00
4.96
2.25
0.00
81.00
4.96
2.25
0.00
82.00
4.96
2.25
0.00
83.00
4.96
2.25
0.00
84.00
4.96
2.25
0.00
85.00
4.96
2.25
0.00
86.00
4.96
2.25
0.00
87.00
4.96
2.25
0.00
88.00
4.96
2.25
0.00
89.00
4.96
2.25
0.00
90.00
4.96
2.25
0.00
91.00
4.96
2.25
0.00
92.00
4.96
2.25
0.00
93.00
4.96
2.25
0.00
94.00
4.96
2.25
0.00
95.00
4.96
2.25
0.00
96.00
4.96
2.25
0.00
97.00
4.96
2.25
0.00
98.00
4.96
2.25
0.00
99.00
4.96
2.25
0.00
100.00
4.96
2.25
0.00
101.00
4.96
2.25
0.00
102.00
4.96
2.25
0.00
103.00
4.96
2.25
0.00
104.00
4.96
2.25
0.00
105.00
4.96
2.25
0.00
106.00
4.96
2.25
0.00
107.00
4.96
2.25
0.00
108.00
4.96
2.25
0.00
109.00
4.96
2.25
0.00
110.00
4.96
2.25
0.00
111.00
4.96
2.25
0.00
112.00
4.96
2.25
0.00
113.00
4.96
2.25
0.00
114.00
4.96
2.25
0.00
115.00
4.96
2.25
0.00
116.00
4.96
2.25
0.00
117.00
4.96
2.25
0.00
118.00
4.96
2.25
0.00
119.00
4.96
2.25
0.00
120.00
4.96
2.25
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 9
Summary for Subcatchment 7S: POST TO POND 3
Runoff = 94.73 cfs @ 11.95 hrs, Volume= 4.617 af, Depth= 3.63"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN
Description
11.010 98
Impervious
4.250 61
>75% Grass cover, Good, HSG B
15.260 88
Weighted Average
4.250
27.85% Pervious Area
11.010
72.15% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 7S: POST TO POND 3
Hydrograph
105
100
-------+--+--+--+--+----+--+--+--+----------+--+--+----------+--+--
cfs-rt--fi--r--'r--I-- ----t--r--------I-- --fi--r-------------t--
■Runoff
94.73
95
YIP ----II----- 1
90
85
----
--'--
---- -- ------------ -- ------------ -- --I -
--'- --' --'---------- --' --' A r 24 r Rainfall-4.9611-
80
75
- - - -
- - - - - - - - - - - - - - - - - + - - - - - - - - - -I- - j - - T - - L - - - - -I- - -I- - 1 - - T - -
Ru hoff 7fillIr-da-,6-1-5.-260 at -
65
--; -
--- --; --;--Ir------ -- --r Llnp VQ1gme7-4 zkf -
w 60
- '
J1---- -----1_-Runoff Dbh.-655
--1--L--L--1--1-- L
0 50
EL 45
----
--r-
-- -- -- -- ---- -- --+------------
y--rt--+--r--r----y-- --+--r--r-------y--+--r--r-------rt--+--
40
--Ir---rt--r--r--Ir--------t--r--Ir--------r--r--Ir---�=8-
35
_ _
- - T - - T - - r - - - -I - - T - - - - T - - r - - I - - I - I - T - - r - - T - - - - - - T - - T - -
30
-_I--
-I-- -- --I--I_----_I---- -- --------I---- _I --------I-- -- --
I I I I I I I I I I I I I I I I I I I
25
--I--
-I--! --! --!----------!--! --!----------!--! --! --------I--! --! --
20
--I--
-- -- --r-- --I-- ----+--r--------I-- ----r--------I-- --+--
15
--+-
+--+--+--+--+-+--+--+--+--+----------+--+--+-----+-+--+--+--
10
�I
--Ir
---7--r--r--r----7--------r--Ir--Ir-------r--r-Ir--Ir--Ii-- --rt--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Hydrograph for Subcatchment 7S: POST TO POND 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.06
6.00
0.40
0.01
0.21
7.00
0.49
0.03
0.38
8.00
0.60
0.06
0.57
9.00
0.73
0.11
1.03
10.00
0.90
0.20
1.55
11.00
1.17
0.35
3.29
12.00
3.29
2.08
80.40
13.00
3.83
2.57
4.58
14.00
4.07
2.79
2.73
15.00
4.23
2.95
2.18
16.00
4.36
3.07
1.68
17.00
4.47
3.17
1.48
18.00
4.57
3.26
1.31
19.00
4.65
3.34
1.13
20.00
4.72
3.41
0.95
21.00
4.79
3.47
0.91
22.00
4.85
3.52
0.87
23.00
4.90
3.58
0.83
24.00
4.96
3.63
0.80
25.00
4.96
3.63
0.00
26.00
4.96
3.63
0.00
27.00
4.96
3.63
0.00
28.00
4.96
3.63
0.00
29.00
4.96
3.63
0.00
30.00
4.96
3.63
0.00
31.00
4.96
3.63
0.00
32.00
4.96
3.63
0.00
33.00
4.96
3.63
0.00
34.00
4.96
3.63
0.00
35.00
4.96
3.63
0.00
36.00
4.96
3.63
0.00
37.00
4.96
3.63
0.00
38.00
4.96
3.63
0.00
39.00
4.96
3.63
0.00
40.00
4.96
3.63
0.00
41.00
4.96
3.63
0.00
42.00
4.96
3.63
0.00
43.00
4.96
3.63
0.00
44.00
4.96
3.63
0.00
45.00
4.96
3.63
0.00
46.00
4.96
3.63
0.00
47.00
4.96
3.63
0.00
48.00
4.96
3.63
0.00
49.00
4.96
3.63
0.00
50.00
4.96
3.63
0.00
51.00
4.96
3.63
0.00
52.00
4.96
3.63
0.00
53.00
4.96
3.63
0.00
54.00
4.96
3.63
0.00
55.00
4.96
3.63
0.00
56.00
4.96
3.63
0.00
57.00
4.96
3.63
0.00
58.00
4.96
3.63
0.00
59.00
4.96
3.63
0.00
60.00
4.96
3.63
0.00
61.00
4.96
3.63
0.00
62.00
4.96
3.63
0.00
63.00
4.96
3.63
0.00
64.00
4.96
3.63
0.00
65.00
4.96
3.63
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.63
0.00
67.00
4.96
3.63
0.00
68.00
4.96
3.63
0.00
69.00
4.96
3.63
0.00
70.00
4.96
3.63
0.00
71.00
4.96
3.63
0.00
72.00
4.96
3.63
0.00
73.00
4.96
3.63
0.00
74.00
4.96
3.63
0.00
75.00
4.96
3.63
0.00
76.00
4.96
3.63
0.00
77.00
4.96
3.63
0.00
78.00
4.96
3.63
0.00
79.00
4.96
3.63
0.00
80.00
4.96
3.63
0.00
81.00
4.96
3.63
0.00
82.00
4.96
3.63
0.00
83.00
4.96
3.63
0.00
84.00
4.96
3.63
0.00
85.00
4.96
3.63
0.00
86.00
4.96
3.63
0.00
87.00
4.96
3.63
0.00
88.00
4.96
3.63
0.00
89.00
4.96
3.63
0.00
90.00
4.96
3.63
0.00
91.00
4.96
3.63
0.00
92.00
4.96
3.63
0.00
93.00
4.96
3.63
0.00
94.00
4.96
3.63
0.00
95.00
4.96
3.63
0.00
96.00
4.96
3.63
0.00
97.00
4.96
3.63
0.00
98.00
4.96
3.63
0.00
99.00
4.96
3.63
0.00
100.00
4.96
3.63
0.00
101.00
4.96
3.63
0.00
102.00
4.96
3.63
0.00
103.00
4.96
3.63
0.00
104.00
4.96
3.63
0.00
105.00
4.96
3.63
0.00
106.00
4.96
3.63
0.00
107.00
4.96
3.63
0.00
108.00
4.96
3.63
0.00
109.00
4.96
3.63
0.00
110.00
4.96
3.63
0.00
111.00
4.96
3.63
0.00
112.00
4.96
3.63
0.00
113.00
4.96
3.63
0.00
114.00
4.96
3.63
0.00
115.00
4.96
3.63
0.00
116.00
4.96
3.63
0.00
117.00
4.96
3.63
0.00
118.00
4.96
3.63
0.00
119.00
4.96
3.63
0.00
120.00
4.96
3.63
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 11
Summary for Subcatchment 9S: POST TO POND 4
Runoff = 64.12 cfs @ 11.95 hrs, Volume= 3.103 af, Depth= 3.53"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
7.330 98 Impervious
3.220 61 >75% Grass cover, Good, HSG B
10.550 87 Weighted Average
3.220 30.52% Pervious Area
7.330 69.48% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 9S: POST TO POND 4
Hydrograph
-------------7--r------------ -- ----T--r---------,--,--7--r-- --
70 ❑Runoff
64.12 Cfs -- -- - -- -- ----- -- -- - - -
65 -- --+-- -- --' -- -- -- -- --' -- Type-N24-hr -
---------------- --- ------'tOrT2hR,ainfarh.96,'�-
55
--------------------- ------ - - - - -- ------------
50 Runoff Arch=0. 155a arc
--�----�--�--1--L--�--1---1---1--J--1--1--�--L--L--�---�--J--�--1--L--L--
45 - 'RpnpffrVpl 1 e=3.1I Q$-1f -
w 40 1 n
T - -T -------- ----7--T--Runes# D�pt�a,531,
3 35
30
--i-- --i-- --+-- ----------i-- -- -- -- -- -------i-- -- - w' -
25
--r-
---- -- -- ------------ -- -- -- -- --------- -- -- -- -- --
20
15
10
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 12
Hydrograph for Subcatchment 9S: POST TO POND 4
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.01
6.00
0.40
0.01
0.11
7.00
0.49
0.02
0.22
8.00
0.60
0.05
0.34
9.00
0.73
0.10
0.64
10.00
0.90
0.17
0.99
11.00
1.17
0.32
2.15
12.00
3.29
1.99
54.55
13.00
3.83
2.48
3.12
14.00
4.07
2.70
1.87
15.00
4.23
2.85
1.49
16.00
4.36
2.97
1.15
17.00
4.47
3.07
1.02
18.00
4.57
3.16
0.90
19.00
4.65
3.24
0.77
20.00
4.72
3.31
0.65
21.00
4.79
3.37
0.62
22.00
4.85
3.42
0.60
23.00
4.90
3.48
0.57
24.00
4.96
3.53
0.55
25.00
4.96
3.53
0.00
26.00
4.96
3.53
0.00
27.00
4.96
3.53
0.00
28.00
4.96
3.53
0.00
29.00
4.96
3.53
0.00
30.00
4.96
3.53
0.00
31.00
4.96
3.53
0.00
32.00
4.96
3.53
0.00
33.00
4.96
3.53
0.00
34.00
4.96
3.53
0.00
35.00
4.96
3.53
0.00
36.00
4.96
3.53
0.00
37.00
4.96
3.53
0.00
38.00
4.96
3.53
0.00
39.00
4.96
3.53
0.00
40.00
4.96
3.53
0.00
41.00
4.96
3.53
0.00
42.00
4.96
3.53
0.00
43.00
4.96
3.53
0.00
44.00
4.96
3.53
0.00
45.00
4.96
3.53
0.00
46.00
4.96
3.53
0.00
47.00
4.96
3.53
0.00
48.00
4.96
3.53
0.00
49.00
4.96
3.53
0.00
50.00
4.96
3.53
0.00
51.00
4.96
3.53
0.00
52.00
4.96
3.53
0.00
53.00
4.96
3.53
0.00
54.00
4.96
3.53
0.00
55.00
4.96
3.53
0.00
56.00
4.96
3.53
0.00
57.00
4.96
3.53
0.00
58.00
4.96
3.53
0.00
59.00
4.96
3.53
0.00
60.00
4.96
3.53
0.00
61.00
4.96
3.53
0.00
62.00
4.96
3.53
0.00
63.00
4.96
3.53
0.00
64.00
4.96
3.53
0.00
65.00
4.96
3.53
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.53
0.00
67.00
4.96
3.53
0.00
68.00
4.96
3.53
0.00
69.00
4.96
3.53
0.00
70.00
4.96
3.53
0.00
71.00
4.96
3.53
0.00
72.00
4.96
3.53
0.00
73.00
4.96
3.53
0.00
74.00
4.96
3.53
0.00
75.00
4.96
3.53
0.00
76.00
4.96
3.53
0.00
77.00
4.96
3.53
0.00
78.00
4.96
3.53
0.00
79.00
4.96
3.53
0.00
80.00
4.96
3.53
0.00
81.00
4.96
3.53
0.00
82.00
4.96
3.53
0.00
83.00
4.96
3.53
0.00
84.00
4.96
3.53
0.00
85.00
4.96
3.53
0.00
86.00
4.96
3.53
0.00
87.00
4.96
3.53
0.00
88.00
4.96
3.53
0.00
89.00
4.96
3.53
0.00
90.00
4.96
3.53
0.00
91.00
4.96
3.53
0.00
92.00
4.96
3.53
0.00
93.00
4.96
3.53
0.00
94.00
4.96
3.53
0.00
95.00
4.96
3.53
0.00
96.00
4.96
3.53
0.00
97.00
4.96
3.53
0.00
98.00
4.96
3.53
0.00
99.00
4.96
3.53
0.00
100.00
4.96
3.53
0.00
101.00
4.96
3.53
0.00
102.00
4.96
3.53
0.00
103.00
4.96
3.53
0.00
104.00
4.96
3.53
0.00
105.00
4.96
3.53
0.00
106.00
4.96
3.53
0.00
107.00
4.96
3.53
0.00
108.00
4.96
3.53
0.00
109.00
4.96
3.53
0.00
110.00
4.96
3.53
0.00
111.00
4.96
3.53
0.00
112.00
4.96
3.53
0.00
113.00
4.96
3.53
0.00
114.00
4.96
3.53
0.00
115.00
4.96
3.53
0.00
116.00
4.96
3.53
0.00
117.00
4.96
3.53
0.00
118.00
4.96
3.53
0.00
119.00
4.96
3.53
0.00
120.00
4.96
3.53
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 13
Summary for Subcatchment 12S: POST TO POND 1
Runoff = 238.99 cfs @ 11.95 hrs, Volume= 11.951 af, Depth= 3.94"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN
Description
29.640 98
Impervious
6.730 61
>75% Grass cover, Good, HSG B
36.370 91
Weighted Average
6.730
18.50% Pervious Area
29.640
81.50% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 12S: POST TO POND 1
Hydrograph
-----I-- r -- r -- r -- r --r --I-- r-- -- t -- r-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 14
Hydrograph for Subcatchment 12S: POST TO POND 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.17
5.00
0.31
0.01
0.54
6.00
0.40
0.03
0.97
7.00
0.49
0.07
1.44
8.00
0.60
0.11
1.93
9.00
0.73
0.19
3.24
10.00
0.90
0.29
4.59
11.00
1.17
0.48
9.24
12.00
3.29
2.34
201.43
13.00
3.83
2.85
11.28
14.00
4.07
3.08
6.72
15.00
4.23
3.24
5.34
16.00
4.36
3.37
4.12
17.00
4.47
3.47
3.63
18.00
4.57
3.56
3.20
19.00
4.65
3.64
2.76
20.00
4.72
3.71
2.32
21.00
4.79
3.77
2.21
22.00
4.85
3.83
2.12
23.00
4.90
3.89
2.04
24.00
4.96
3.94
1.94
25.00
4.96
3.94
0.00
26.00
4.96
3.94
0.00
27.00
4.96
3.94
0.00
28.00
4.96
3.94
0.00
29.00
4.96
3.94
0.00
30.00
4.96
3.94
0.00
31.00
4.96
3.94
0.00
32.00
4.96
3.94
0.00
33.00
4.96
3.94
0.00
34.00
4.96
3.94
0.00
35.00
4.96
3.94
0.00
36.00
4.96
3.94
0.00
37.00
4.96
3.94
0.00
38.00
4.96
3.94
0.00
39.00
4.96
3.94
0.00
40.00
4.96
3.94
0.00
41.00
4.96
3.94
0.00
42.00
4.96
3.94
0.00
43.00
4.96
3.94
0.00
44.00
4.96
3.94
0.00
45.00
4.96
3.94
0.00
46.00
4.96
3.94
0.00
47.00
4.96
3.94
0.00
48.00
4.96
3.94
0.00
49.00
4.96
3.94
0.00
50.00
4.96
3.94
0.00
51.00
4.96
3.94
0.00
52.00
4.96
3.94
0.00
53.00
4.96
3.94
0.00
54.00
4.96
3.94
0.00
55.00
4.96
3.94
0.00
56.00
4.96
3.94
0.00
57.00
4.96
3.94
0.00
58.00
4.96
3.94
0.00
59.00
4.96
3.94
0.00
60.00
4.96
3.94
0.00
61.00
4.96
3.94
0.00
62.00
4.96
3.94
0.00
63.00
4.96
3.94
0.00
64.00
4.96
3.94
0.00
65.00
4.96
3.94
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.94
0.00
67.00
4.96
3.94
0.00
68.00
4.96
3.94
0.00
69.00
4.96
3.94
0.00
70.00
4.96
3.94
0.00
71.00
4.96
3.94
0.00
72.00
4.96
3.94
0.00
73.00
4.96
3.94
0.00
74.00
4.96
3.94
0.00
75.00
4.96
3.94
0.00
76.00
4.96
3.94
0.00
77.00
4.96
3.94
0.00
78.00
4.96
3.94
0.00
79.00
4.96
3.94
0.00
80.00
4.96
3.94
0.00
81.00
4.96
3.94
0.00
82.00
4.96
3.94
0.00
83.00
4.96
3.94
0.00
84.00
4.96
3.94
0.00
85.00
4.96
3.94
0.00
86.00
4.96
3.94
0.00
87.00
4.96
3.94
0.00
88.00
4.96
3.94
0.00
89.00
4.96
3.94
0.00
90.00
4.96
3.94
0.00
91.00
4.96
3.94
0.00
92.00
4.96
3.94
0.00
93.00
4.96
3.94
0.00
94.00
4.96
3.94
0.00
95.00
4.96
3.94
0.00
96.00
4.96
3.94
0.00
97.00
4.96
3.94
0.00
98.00
4.96
3.94
0.00
99.00
4.96
3.94
0.00
100.00
4.96
3.94
0.00
101.00
4.96
3.94
0.00
102.00
4.96
3.94
0.00
103.00
4.96
3.94
0.00
104.00
4.96
3.94
0.00
105.00
4.96
3.94
0.00
106.00
4.96
3.94
0.00
107.00
4.96
3.94
0.00
108.00
4.96
3.94
0.00
109.00
4.96
3.94
0.00
110.00
4.96
3.94
0.00
111.00
4.96
3.94
0.00
112.00
4.96
3.94
0.00
113.00
4.96
3.94
0.00
114.00
4.96
3.94
0.00
115.00
4.96
3.94
0.00
116.00
4.96
3.94
0.00
117.00
4.96
3.94
0.00
118.00
4.96
3.94
0.00
119.00
4.96
3.94
0.00
120.00
4.96
3.94
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 15
Summary for Subcatchment 14S: POST TO POND 6
Runoff = 87.79 cfs @ 11.95 hrs, Volume= 4.312 af, Depth= 3.73"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN
Description
10.310 98
Impervious
3.550 61
>75% Grass cover, Good, HSG B
13.860 89
Weighted Average
3.550
25.61 % Pervious Area
10.310
74.39% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 14S: POST TO POND 6
Hydrograph
95--+--r--r--r-------------+--r--r--r----r----+--r--r--
90
Cfs
■Runoff
87.79
�
----
85
�
---- --+-- ----�r------- -- -- --+-- -------I�T pe-��124-hr -
80
--'--
--'----+--+----Ir------------- -IRS--
10 r l4h r- Rai nfa [[-- .9W
75
70
'
--Ir-
--'--
- -
----y--+--r--r--r-------y--rt--- - i- A q /y
--'-- --+--+-- --'II------'-- -- ---Ruhoff Ar6a=1a.g64-at -
65
60
'
--Ir-
----
----y--T--r--r--Ir--Ir----y--rt--1--+--r--Ir--Ir----y-- -- - r--
------T-- r-- r------------rt--�npfflrY-Q1µm,Ie=4, 1 0
w 55
50
--I--
--I--y--+--t--r--I---I---I--y--rt--rt- -+- - RunoffI a`pID thT 13'�I `-
3
45
--I--
--r-
--I--r--r--r--r--r--I---I--r--r--r-- r-- r-- r-- I---I--rT r--r--r--r--
----,--T--r--r--Ir------- -- ----r--r--Ir-------io5.�-�rl--
LL
40
35
----
--Ir-
w'
----r--r--r--r--r--I---I--r--r--r--r--r--r--I---I--r--r-�ly V$ -
-- I--r--r--r-- r--I---I--- I-- r-- r-- r-- r-- r--r--r-- I--r--r-- r-
30
--�
rrrr--r--r--I-- IrrrrrrI-Irrrr--r--
25
------ -- -- -- -- --
20
IrrrrrI-rrr--r1510
Li--
TTrirTTTrrr-1 -1 TrrI I I I I I I I I I I I I I I I I I I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 16
Hydrograph for Subcatchment 14S: POST TO POND 6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.10
6.00
0.40
0.02
0.24
7.00
0.49
0.04
0.41
8.00
0.60
0.08
0.58
9.00
0.73
0.14
1.03
10.00
0.90
0.22
1.52
11.00
1.17
0.39
3.16
12.00
3.29
2.16
74.33
13.00
3.83
2.66
4.21
14.00
4.07
2.89
2.51
15.00
4.23
3.04
2.00
16.00
4.36
3.17
1.54
17.00
4.47
3.27
1.36
18.00
4.57
3.36
1.20
19.00
4.65
3.44
1.04
20.00
4.72
3.51
0.87
21.00
4.79
3.57
0.83
22.00
4.85
3.62
0.80
23.00
4.90
3.68
0.76
24.00
4.96
3.73
0.73
25.00
4.96
3.73
0.00
26.00
4.96
3.73
0.00
27.00
4.96
3.73
0.00
28.00
4.96
3.73
0.00
29.00
4.96
3.73
0.00
30.00
4.96
3.73
0.00
31.00
4.96
3.73
0.00
32.00
4.96
3.73
0.00
33.00
4.96
3.73
0.00
34.00
4.96
3.73
0.00
35.00
4.96
3.73
0.00
36.00
4.96
3.73
0.00
37.00
4.96
3.73
0.00
38.00
4.96
3.73
0.00
39.00
4.96
3.73
0.00
40.00
4.96
3.73
0.00
41.00
4.96
3.73
0.00
42.00
4.96
3.73
0.00
43.00
4.96
3.73
0.00
44.00
4.96
3.73
0.00
45.00
4.96
3.73
0.00
46.00
4.96
3.73
0.00
47.00
4.96
3.73
0.00
48.00
4.96
3.73
0.00
49.00
4.96
3.73
0.00
50.00
4.96
3.73
0.00
51.00
4.96
3.73
0.00
52.00
4.96
3.73
0.00
53.00
4.96
3.73
0.00
54.00
4.96
3.73
0.00
55.00
4.96
3.73
0.00
56.00
4.96
3.73
0.00
57.00
4.96
3.73
0.00
58.00
4.96
3.73
0.00
59.00
4.96
3.73
0.00
60.00
4.96
3.73
0.00
61.00
4.96
3.73
0.00
62.00
4.96
3.73
0.00
63.00
4.96
3.73
0.00
64.00
4.96
3.73
0.00
65.00
4.96
3.73
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.73
0.00
67.00
4.96
3.73
0.00
68.00
4.96
3.73
0.00
69.00
4.96
3.73
0.00
70.00
4.96
3.73
0.00
71.00
4.96
3.73
0.00
72.00
4.96
3.73
0.00
73.00
4.96
3.73
0.00
74.00
4.96
3.73
0.00
75.00
4.96
3.73
0.00
76.00
4.96
3.73
0.00
77.00
4.96
3.73
0.00
78.00
4.96
3.73
0.00
79.00
4.96
3.73
0.00
80.00
4.96
3.73
0.00
81.00
4.96
3.73
0.00
82.00
4.96
3.73
0.00
83.00
4.96
3.73
0.00
84.00
4.96
3.73
0.00
85.00
4.96
3.73
0.00
86.00
4.96
3.73
0.00
87.00
4.96
3.73
0.00
88.00
4.96
3.73
0.00
89.00
4.96
3.73
0.00
90.00
4.96
3.73
0.00
91.00
4.96
3.73
0.00
92.00
4.96
3.73
0.00
93.00
4.96
3.73
0.00
94.00
4.96
3.73
0.00
95.00
4.96
3.73
0.00
96.00
4.96
3.73
0.00
97.00
4.96
3.73
0.00
98.00
4.96
3.73
0.00
99.00
4.96
3.73
0.00
100.00
4.96
3.73
0.00
101.00
4.96
3.73
0.00
102.00
4.96
3.73
0.00
103.00
4.96
3.73
0.00
104.00
4.96
3.73
0.00
105.00
4.96
3.73
0.00
106.00
4.96
3.73
0.00
107.00
4.96
3.73
0.00
108.00
4.96
3.73
0.00
109.00
4.96
3.73
0.00
110.00
4.96
3.73
0.00
111.00
4.96
3.73
0.00
112.00
4.96
3.73
0.00
113.00
4.96
3.73
0.00
114.00
4.96
3.73
0.00
115.00
4.96
3.73
0.00
116.00
4.96
3.73
0.00
117.00
4.96
3.73
0.00
118.00
4.96
3.73
0.00
119.00
4.96
3.73
0.00
120.00
4.96
3.73
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 17
Summary for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Runoff = 48.41 cfs @ 11.96 hrs, Volume= 2.238 af, Depth= 2.17"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
3.800 98 Impervious
8.590 61 >75% Grass cover, Good, HSG B
12.390 72 Weighted Average
8.590 69.33% Pervious Area
3.800 30.67% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Hydrograph
--7--r--r--Ir--Ir--li-----------r--r--Ir--
50 48.41 cfs
--- ',Type-N 24-h� -
45
-- ------t--t--r----- I --- _-----rtlO�KT24hr-Raaftfa[[�4.96''--
40 1
- - - - - - 1 - - Ruhoff Ar6a=12-390 arc -
35
_ - -- -- -- --' -- -- Rqn( Vpl ime=2. 3$_4 -
H 30 I
Runoff IDupthT2.117" -
0 25 Tc"5.0 M i n
LL I I I I I I I I I I I I I I I I I
20 PN=7�
--r---I--y--t--L--r--r--I---I--y--rt--rt--L--r--r--r--I--y--�--t--r--r--
15
10
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 18
Hydrograph for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.00
0.12
11.00
1.17
0.04
0.69
12.00
3.29
0.99
42.96
13.00
3.83
1.34
2.75
14.00
4.07
1.51
1.68
15.00
4.23
1.63
1.36
16.00
4.36
1.72
1.06
17.00
4.47
1.80
0.94
18.00
4.57
1.87
0.84
19.00
4.65
1.93
0.73
20.00
4.72
1.99
0.62
21.00
4.79
2.03
0.59
22.00
4.85
2.08
0.57
23.00
4.90
2.12
0.55
24.00
4.96
2.17
0.52
25.00
4.96
2.17
0.00
26.00
4.96
2.17
0.00
27.00
4.96
2.17
0.00
28.00
4.96
2.17
0.00
29.00
4.96
2.17
0.00
30.00
4.96
2.17
0.00
31.00
4.96
2.17
0.00
32.00
4.96
2.17
0.00
33.00
4.96
2.17
0.00
34.00
4.96
2.17
0.00
35.00
4.96
2.17
0.00
36.00
4.96
2.17
0.00
37.00
4.96
2.17
0.00
38.00
4.96
2.17
0.00
39.00
4.96
2.17
0.00
40.00
4.96
2.17
0.00
41.00
4.96
2.17
0.00
42.00
4.96
2.17
0.00
43.00
4.96
2.17
0.00
44.00
4.96
2.17
0.00
45.00
4.96
2.17
0.00
46.00
4.96
2.17
0.00
47.00
4.96
2.17
0.00
48.00
4.96
2.17
0.00
49.00
4.96
2.17
0.00
50.00
4.96
2.17
0.00
51.00
4.96
2.17
0.00
52.00
4.96
2.17
0.00
53.00
4.96
2.17
0.00
54.00
4.96
2.17
0.00
55.00
4.96
2.17
0.00
56.00
4.96
2.17
0.00
57.00
4.96
2.17
0.00
58.00
4.96
2.17
0.00
59.00
4.96
2.17
0.00
60.00
4.96
2.17
0.00
61.00
4.96
2.17
0.00
62.00
4.96
2.17
0.00
63.00
4.96
2.17
0.00
64.00
4.96
2.17
0.00
65.00
4.96
2.17
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
2.17
0.00
67.00
4.96
2.17
0.00
68.00
4.96
2.17
0.00
69.00
4.96
2.17
0.00
70.00
4.96
2.17
0.00
71.00
4.96
2.17
0.00
72.00
4.96
2.17
0.00
73.00
4.96
2.17
0.00
74.00
4.96
2.17
0.00
75.00
4.96
2.17
0.00
76.00
4.96
2.17
0.00
77.00
4.96
2.17
0.00
78.00
4.96
2.17
0.00
79.00
4.96
2.17
0.00
80.00
4.96
2.17
0.00
81.00
4.96
2.17
0.00
82.00
4.96
2.17
0.00
83.00
4.96
2.17
0.00
84.00
4.96
2.17
0.00
85.00
4.96
2.17
0.00
86.00
4.96
2.17
0.00
87.00
4.96
2.17
0.00
88.00
4.96
2.17
0.00
89.00
4.96
2.17
0.00
90.00
4.96
2.17
0.00
91.00
4.96
2.17
0.00
92.00
4.96
2.17
0.00
93.00
4.96
2.17
0.00
94.00
4.96
2.17
0.00
95.00
4.96
2.17
0.00
96.00
4.96
2.17
0.00
97.00
4.96
2.17
0.00
98.00
4.96
2.17
0.00
99.00
4.96
2.17
0.00
100.00
4.96
2.17
0.00
101.00
4.96
2.17
0.00
102.00
4.96
2.17
0.00
103.00
4.96
2.17
0.00
104.00
4.96
2.17
0.00
105.00
4.96
2.17
0.00
106.00
4.96
2.17
0.00
107.00
4.96
2.17
0.00
108.00
4.96
2.17
0.00
109.00
4.96
2.17
0.00
110.00
4.96
2.17
0.00
111.00
4.96
2.17
0.00
112.00
4.96
2.17
0.00
113.00
4.96
2.17
0.00
114.00
4.96
2.17
0.00
115.00
4.96
2.17
0.00
116.00
4.96
2.17
0.00
117.00
4.96
2.17
0.00
118.00
4.96
2.17
0.00
119.00
4.96
2.17
0.00
120.00
4.96
2.17
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 19
Summary for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Runoff = 15.17 cfs @ 12.18 hrs, Volume= 1.408 af, Depth= 1.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac)
CN
Description
7.730
55
Woods, Good, HSG B
7.000
61
>75% Grass cover, Good, HSG B
14.730
58
Weighted Average
14.730
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Hydrograph
----------+--+--+--+--+--�--+--+--+--+--+--+--+--+-+--+--+--+--+--+-- ■Runoff
16 15.17 Cfs--i--L------------J--i--i-- --L--L-----1--J--1--1--L--L--
15-- -- -- -- Ili -- Ili -----Type,?4-h -
14
13-
12- --------+--+-------------�--�-
Ruhoff Ar6a:�14-730 at -
10
w--+-+--+--+--+--+--+-------+--+--+--+--r--+koi_ -+--+--+--+--+--
9 - 1--L-- -- 1--1-- --Runoff De-p#h:;1J51L
7
--r----+--+--+--r--r-------+--+--+--+--r- _- - -i +- + r- r--
6 -'- ----1--L--L--1---1---1--J--1--1--+--L----'---I q— �19-M'�--
s - - -- -- - - -- -- -- - - -- ---4�N=6&-
4
--r-
--- -- -- ------------ -- -- -- -- --------- -- -- -- -- --
3 ------+--+--+--+---------+--+--+--+--+--+-------+--+--+--+--+--
2
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 20
Hydrograph for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.00
0.00
11.00
1.17
0.00
0.00
12.00
3.29
0.37
6.47
13.00
3.83
0.59
2.58
14.00
4.07
0.70
1.47
15.00
4.23
0.77
1.13
16.00
4.36
0.84
0.91
17.00
4.47
0.89
0.78
18.00
4.57
0.94
0.71
19.00
4.65
0.98
0.62
20.00
4.72
1.02
0.53
21.00
4.79
1.05
0.49
22.00
4.85
1.09
0.48
23.00
4.90
1.12
0.46
24.00
4.96
1.15
0.45
25.00
4.96
1.15
0.00
26.00
4.96
1.15
0.00
27.00
4.96
1.15
0.00
28.00
4.96
1.15
0.00
29.00
4.96
1.15
0.00
30.00
4.96
1.15
0.00
31.00
4.96
1.15
0.00
32.00
4.96
1.15
0.00
33.00
4.96
1.15
0.00
34.00
4.96
1.15
0.00
35.00
4.96
1.15
0.00
36.00
4.96
1.15
0.00
37.00
4.96
1.15
0.00
38.00
4.96
1.15
0.00
39.00
4.96
1.15
0.00
40.00
4.96
1.15
0.00
41.00
4.96
1.15
0.00
42.00
4.96
1.15
0.00
43.00
4.96
1.15
0.00
44.00
4.96
1.15
0.00
45.00
4.96
1.15
0.00
46.00
4.96
1.15
0.00
47.00
4.96
1.15
0.00
48.00
4.96
1.15
0.00
49.00
4.96
1.15
0.00
50.00
4.96
1.15
0.00
51.00
4.96
1.15
0.00
52.00
4.96
1.15
0.00
53.00
4.96
1.15
0.00
54.00
4.96
1.15
0.00
55.00
4.96
1.15
0.00
56.00
4.96
1.15
0.00
57.00
4.96
1.15
0.00
58.00
4.96
1.15
0.00
59.00
4.96
1.15
0.00
60.00
4.96
1.15
0.00
61.00
4.96
1.15
0.00
62.00
4.96
1.15
0.00
63.00
4.96
1.15
0.00
64.00
4.96
1.15
0.00
65.00
4.96
1.15
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
1.15
0.00
67.00
4.96
1.15
0.00
68.00
4.96
1.15
0.00
69.00
4.96
1.15
0.00
70.00
4.96
1.15
0.00
71.00
4.96
1.15
0.00
72.00
4.96
1.15
0.00
73.00
4.96
1.15
0.00
74.00
4.96
1.15
0.00
75.00
4.96
1.15
0.00
76.00
4.96
1.15
0.00
77.00
4.96
1.15
0.00
78.00
4.96
1.15
0.00
79.00
4.96
1.15
0.00
80.00
4.96
1.15
0.00
81.00
4.96
1.15
0.00
82.00
4.96
1.15
0.00
83.00
4.96
1.15
0.00
84.00
4.96
1.15
0.00
85.00
4.96
1.15
0.00
86.00
4.96
1.15
0.00
87.00
4.96
1.15
0.00
88.00
4.96
1.15
0.00
89.00
4.96
1.15
0.00
90.00
4.96
1.15
0.00
91.00
4.96
1.15
0.00
92.00
4.96
1.15
0.00
93.00
4.96
1.15
0.00
94.00
4.96
1.15
0.00
95.00
4.96
1.15
0.00
96.00
4.96
1.15
0.00
97.00
4.96
1.15
0.00
98.00
4.96
1.15
0.00
99.00
4.96
1.15
0.00
100.00
4.96
1.15
0.00
101.00
4.96
1.15
0.00
102.00
4.96
1.15
0.00
103.00
4.96
1.15
0.00
104.00
4.96
1.15
0.00
105.00
4.96
1.15
0.00
106.00
4.96
1.15
0.00
107.00
4.96
1.15
0.00
108.00
4.96
1.15
0.00
109.00
4.96
1.15
0.00
110.00
4.96
1.15
0.00
111.00
4.96
1.15
0.00
112.00
4.96
1.15
0.00
113.00
4.96
1.15
0.00
114.00
4.96
1.15
0.00
115.00
4.96
1.15
0.00
116.00
4.96
1.15
0.00
117.00
4.96
1.15
0.00
118.00
4.96
1.15
0.00
119.00
4.96
1.15
0.00
120.00
4.96
1.15
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 21
Summary for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Runoff = 4.20 cfs @ 12.17 hrs, Volume= 0.381 af, Depth= 1.21"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac)
CN
Description
3.190
55
Woods, Good, HSG B
0.580
78
Row crops, straight row, Good, HSG B
3.770
59
Weighted Average
3.770
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Hydrograph
� � � � � � � �� � � � � �� �� �� �� �� �� � � � � � ■Runoff
4.20 Cfs
----
10yr-r24hr R;ainfaill:;4.96'.
RUn6ffAlrea=3.770 at
--r -i--r--r--r--r--i---i--r--r--t--r--r--r--i---i--r--r--r--r--i---i--
3 R4npff',VQ14m�e=0.$81 calf
Ru��noff'DepthT1.21';..
LL --+-- --' -- ----------F16w't6in9th=�1;1ST-
0
2
Tq=�1.�9 mill
ON=59
� LI
I I I I I I I I I I I I I I I I I I I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 22
Hydrograph for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.00
0.00
11.00
1.17
0.00
0.00
12.00
3.29
0.41
1.87
13.00
3.83
0.63
0.69
14.00
4.07
0.74
0.39
15.00
4.23
0.83
0.30
16.00
4.36
0.89
0.24
17.00
4.47
0.95
0.21
18.00
4.57
1.00
0.19
19.00
4.65
1.04
0.16
20.00
4.72
1.08
0.14
21.00
4.79
1.11
0.13
22.00
4.85
1.15
0.13
23.00
4.90
1.18
0.12
24.00
4.96
1.21
0.12
25.00
4.96
1.21
0.00
26.00
4.96
1.21
0.00
27.00
4.96
1.21
0.00
28.00
4.96
1.21
0.00
29.00
4.96
1.21
0.00
30.00
4.96
1.21
0.00
31.00
4.96
1.21
0.00
32.00
4.96
1.21
0.00
33.00
4.96
1.21
0.00
34.00
4.96
1.21
0.00
35.00
4.96
1.21
0.00
36.00
4.96
1.21
0.00
37.00
4.96
1.21
0.00
38.00
4.96
1.21
0.00
39.00
4.96
1.21
0.00
40.00
4.96
1.21
0.00
41.00
4.96
1.21
0.00
42.00
4.96
1.21
0.00
43.00
4.96
1.21
0.00
44.00
4.96
1.21
0.00
45.00
4.96
1.21
0.00
46.00
4.96
1.21
0.00
47.00
4.96
1.21
0.00
48.00
4.96
1.21
0.00
49.00
4.96
1.21
0.00
50.00
4.96
1.21
0.00
51.00
4.96
1.21
0.00
52.00
4.96
1.21
0.00
53.00
4.96
1.21
0.00
54.00
4.96
1.21
0.00
55.00
4.96
1.21
0.00
56.00
4.96
1.21
0.00
57.00
4.96
1.21
0.00
58.00
4.96
1.21
0.00
59.00
4.96
1.21
0.00
60.00
4.96
1.21
0.00
61.00
4.96
1.21
0.00
62.00
4.96
1.21
0.00
63.00
4.96
1.21
0.00
64.00
4.96
1.21
0.00
65.00
4.96
1.21
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
1.21
0.00
67.00
4.96
1.21
0.00
68.00
4.96
1.21
0.00
69.00
4.96
1.21
0.00
70.00
4.96
1.21
0.00
71.00
4.96
1.21
0.00
72.00
4.96
1.21
0.00
73.00
4.96
1.21
0.00
74.00
4.96
1.21
0.00
75.00
4.96
1.21
0.00
76.00
4.96
1.21
0.00
77.00
4.96
1.21
0.00
78.00
4.96
1.21
0.00
79.00
4.96
1.21
0.00
80.00
4.96
1.21
0.00
81.00
4.96
1.21
0.00
82.00
4.96
1.21
0.00
83.00
4.96
1.21
0.00
84.00
4.96
1.21
0.00
85.00
4.96
1.21
0.00
86.00
4.96
1.21
0.00
87.00
4.96
1.21
0.00
88.00
4.96
1.21
0.00
89.00
4.96
1.21
0.00
90.00
4.96
1.21
0.00
91.00
4.96
1.21
0.00
92.00
4.96
1.21
0.00
93.00
4.96
1.21
0.00
94.00
4.96
1.21
0.00
95.00
4.96
1.21
0.00
96.00
4.96
1.21
0.00
97.00
4.96
1.21
0.00
98.00
4.96
1.21
0.00
99.00
4.96
1.21
0.00
100.00
4.96
1.21
0.00
101.00
4.96
1.21
0.00
102.00
4.96
1.21
0.00
103.00
4.96
1.21
0.00
104.00
4.96
1.21
0.00
105.00
4.96
1.21
0.00
106.00
4.96
1.21
0.00
107.00
4.96
1.21
0.00
108.00
4.96
1.21
0.00
109.00
4.96
1.21
0.00
110.00
4.96
1.21
0.00
111.00
4.96
1.21
0.00
112.00
4.96
1.21
0.00
113.00
4.96
1.21
0.00
114.00
4.96
1.21
0.00
115.00
4.96
1.21
0.00
116.00
4.96
1.21
0.00
117.00
4.96
1.21
0.00
118.00
4.96
1.21
0.00
119.00
4.96
1.21
0.00
120.00
4.96
1.21
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 23
Summary for Pond 2P: POND 2
Inflow Area = 19.790 ac, 74.23% Impervious, Inflow Depth = 3.63" for 10yr-24hr event
Inflow = 122.86 cfs @ 11.95 hrs, Volume= 5.988 of
Outflow = 17.52 cfs @ 12.17 hrs, Volume= 5.970 af, Atten= 86%, Lag= 13.2 min
Primary = 17.52 cfs @ 12.17 hrs, Volume= 5.970 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 715.83' @ 12.17 hrs Surf.Area= 31,565 sf Storage= 140,177 cf
Plug -Flow detention time= 854.6 min calculated for 5.967 of (100% of inflow)
Center -of -Mass det. time= 854.6 min ( 1,648.7 - 794.1 )
Volume Invert
Avail.Storage Storage Description
#1 710.50'
290,610 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.50
20,568
0 0
711.00
22,310
10,720 10,720
712.00
24,113
23,212 33,931
713.00
25,975
25,044 58,975
714.00
27,897
26,936 85,911
715.00
29,879
28,888 114,799
716.00
31,920
30,900 145,699
717.00
34,021
32,971 178,669
718.00
36,183
35,102 213,771
719.00
38,404
37,294 251,065
720.00
40,686
39,545 290,610
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.50'
4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Slotted Weirs X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=17.46 cfs @ 12.17 hrs HW=715.82' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 17.46 cfs of 35.26 cfs potential flow)
2=4.5" Orifice (Orifice Controls 1.21 cfs @ 10.91 fps)
3=Slotted Weirs (Orifice Controls 16.25 cfs @ 3.61 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.50' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD® 10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 24
.....
Inflow1 ac
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• o - 1

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.50
0.00
0.00
0.00
2.50
0.00
0
710.50
0.00
0.00
0.00
5.00
0.07
59
710.50
0.00
0.00
0.00
7.50
0.61
2,912
710.64
0.05
0.05
0.00
10.00
2.01
11,870
711.05
0.32
0.32
0.00
12.50
9.48
135,718
715.68
15.25
15.25
0.00
15.00
2.82
119,949
715.17
3.18
3.18
0.00
17.50
1.81
117,647
715.09
1.96
1.96
0.00
20.00
1.23
116,229
715.05
1.41
1.41
0.00
22.50
1.11
115,326
715.02
1.17
1.17
0.00
25.00
0.00
111,279
714.88
1.09
1.09
0.00
27.50
0.00
101,671
714.55
1.05
1.05
0.00
30.00
0.00
92,459
714.23
1.00
1.00
0.00
32.50
0.00
83,650
713.92
0.96
0.96
0.00
35.00
0.00
75,255
713.61
0.91
0.91
0.00
37.50
0.00
67,281
713.32
0.86
0.86
0.00
40.00
0.00
59,738
713.03
0.81
0.81
0.00
42.50
0.00
52,635
712.75
0.76
0.76
0.00
45.00
0.00
45,981
712.49
0.71
0.71
0.00
47.50
0.00
39,785
712.24
0.66
0.66
0.00
50.00
0.00
34,055
712.01
0.61
0.61
0.00
52.50
0.00
28,800
711.79
0.56
0.56
0.00
55.00
0.00
24,027
711.58
0.50
0.50
0.00
57.50
0.00
19,745
711.40
0.45
0.45
0.00
60.00
0.00
15,960
711.23
0.39
0.39
0.00
62.50
0.00
12,679
711.09
0.34
0.34
0.00
65.00
0.00
9,908
710.96
0.28
0.28
0.00
67.50
0.00
7,651
710.86
0.22
0.22
0.00
70.00
0.00
5,925
710.78
0.16
0.16
0.00
72.50
0.00
4,714
710.72
0.11
0.11
0.00
75.00
0.00
3,864
710.68
0.08
0.08
0.00
77.50
0.00
3,250
710.66
0.06
0.06
0.00
80.00
0.00
2,792
710.63
0.04
0.04
0.00
82.50
0.00
2,440
710.62
0.03
0.03
0.00
85.00
0.00
2,162
710.60
0.03
0.03
0.00
87.50
0.00
1,939
710.59
0.02
0.02
0.00
90.00
0.00
1,755
710.58
0.02
0.02
0.00
92.50
0.00
1,602
710.58
0.02
0.02
0.00
95.00
0.00
1,473
710.57
0.01
0.01
0.00
97.50
0.00
1,362
710.57
0.01
0.01
0.00
100.00
0.00
1,267
710.56
0.01
0.01
0.00
102.50
0.00
1,183
710.56
0.01
0.01
0.00
105.00
0.00
1,110
710.55
0.01
0.01
0.00
107.50
0.00
1,045
710.55
0.01
0.01
0.00
110.00
0.00
987
710.55
0.01
0.01
0.00
112.50
0.00
935
710.55
0.01
0.01
0.00
115.00
0.00
888
710.54
0.00
0.00
0.00
117.50
0.00
845
710.54
0.00
0.00
0.00
120.00
0.00
806
710.54
0.00
0.00
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 26
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.50
0.00
0.00
0.00
710.60
0.03
0.03
0.00
710.70
0.09
0.09
0.00
710.80
0.18
0.18
0.00
710.90
0.25
0.25
0.00
711.00
0.30
0.30
0.00
711.10
0.34
0.34
0.00
711.20
0.38
0.38
0.00
711.30
0.42
0.42
0.00
711.40
0.45
0.45
0.00
711.50
0.48
0.48
0.00
711.60
0.51
0.51
0.00
711.70
0.54
0.54
0.00
711.80
0.56
0.56
0.00
711.90
0.59
0.59
0.00
712.00
0.61
0.61
0.00
712.10
0.63
0.63
0.00
712.20
0.65
0.65
0.00
712.30
0.68
0.68
0.00
712.40
0.70
0.70
0.00
712.50
0.72
0.72
0.00
712.60
0.74
0.74
0.00
712.70
0.75
0.75
0.00
712.80
0.77
0.77
0.00
712.90
0.79
0.79
0.00
713.00
0.81
0.81
0.00
713.10
0.83
0.83
0.00
713.20
0.84
0.84
0.00
713.30
0.86
0.86
0.00
713.40
0.88
0.88
0.00
713.50
0.89
0.89
0.00
713.60
0.91
0.91
0.00
713.70
0.92
0.92
0.00
713.80
0.94
0.94
0.00
713.90
0.95
0.95
0.00
714.00
0.97
0.97
0.00
714.10
0.98
0.98
0.00
714.20
1.00
1.00
0.00
714.30
1.01
1.01
0.00
714.40
1.02
1.02
0.00
714.50
1.04
1.04
0.00
714.60
1.05
1.05
0.00
714.70
1.07
1.07
0.00
714.80
1.08
1.08
0.00
714.90
1.09
1.09
0.00
715.00
1.10
1.10
0.00
715.10
2.03
2.03
0.00
715.20
3.71
3.71
0.00
715.30
5.89
5.89
0.00
715.40
8.46
8.46
0.00
715.50
11.38
11.38
0.00
715.60
13.69
13.69
0.00
715.70
15.53
15.53
0.00
715.80
17.13
17.13
0.00
715.90
18.57
18.57
0.00
716.00
19.90
19.90
0.00
716.10
21.14
21.14
0.00
716.20
22.31
22.31
0.00
716.30
23.41
23.41
0.00
716.40
24.46
24.46
0.00
716.50
25.47
25.47
0.00
716.60
26.43
26.43
0.00
716.70
27.36
27.36
0.00
716.80
28.26
28.26
0.00
716.90
29.13
29.13
0.00
717.00
29.97
29.97
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
717.10
30.80
30.80
0.00
717.20
31.59
31.59
0.00
717.30
32.37
32.37
0.00
717.40
33.13
33.13
0.00
717.50
33.87
33.87
0.00
717.60
34.60
34.60
0.00
717.70
35.31
35.31
0.00
717.80
36.00
36.00
0.00
717.90
36.69
36.69
0.00
718.00
37.36
37.36
0.00
718.10
39.67
39.67
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 27
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.50
20,568
0
710.60
20,916
2,074
710.70
21,265
4,183
710.80
21,613
6,327
710.90
21,962
8,506
711.00
22,310
10,720
711.10
22,490
12,960
711.20
22,671
15,218
711.30
22,851
17,494
711.40
23,031
19,788
711.50
23,212
22,100
711.60
23,392
24,430
711.70
23,572
26,778
711.80
23,752
29,144
711.90
23,933
31,529
712.00
24,113
33,931
712.10
24,299
36,352
712.20
24,485
38,791
712.30
24,672
41,249
712.40
24,858
43,725
712.50
25,044
46,220
712.60
25,230
48,734
712.70
25,416
51,266
712.80
25,603
53,817
712.90
25,789
56,387
713.00
25,975
58,975
713.10
26,167
61,582
713.20
26,359
64,208
713.30
26,552
66,854
713.40
26,744
69,519
713.50
26,936
72,203
713.60
27,128
74,906
713.70
27,320
77,628
713.80
27,513
80,370
713.90
27,705
83,131
714.00
27,897
85,911
714.10
28,095
88,711
714.20
28,293
91,530
714.30
28,492
94,369
714.40
28,690
97,228
714.50
28,888
100,107
714.60
29,086
103,006
714.70
29,284
105,924
714.80
29,483
108,863
714.90
29,681
111,821
715.00
29,879
114,799
715.10
30,083
117,797
715.20
30,287
120,816
715.30
30,491
123,855
715.40
30,695
126,914
715.50
30,900
129,994
715.60
31,104
133,094
715.70
31,308
136,214
715.80
31,512
139,355
715.90
31,716
142,517
716.00
31,920
145,699
716.10
32,130
148,901
716.20
32,340
152,125
716.30
32,550
155,369
716.40
32,760
158,635
716.50
32,971
161,921
716.60
33,181
165,229
716.70
33,391
168,557
716.80
33,601
171,907
716.90
33,811
175,277
717.00
34.021
178.669
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
717.10
34,237
182,082
717.20
34,453
185,516
717.30
34,670
188,973
717.40
34,886
192,450
717.50
35,102
195,950
717.60
35,318
199,471
717.70
35,534
203,013
717.80
35,751
206,578
717.90
35,967
210,164
718.00
36,183
213,771
718.10
36,405
217,400
718.20
36,627
221,052
718.30
36,849
224,726
718.40
37,071
228,422
718.50
37,294
232,140
718.60
37,516
235,881
718.70
37,738
239,643
718.80
37,960
243,428
718.90
38,182
247,235
719.00
38,404
251,065
719.10
38,632
254,916
719.20
38,860
258,791
719.30
39,089
262,688
719.40
39,317
266,609
719.50
39,545
270,552
719.60
39,773
274,518
719.70
40,001
278,506
719.80
40,230
282,518
719.90
40,458
286,552
720.00
40,686
290,610

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 28
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 3.63" for 10yr-24hr event
Inflow = 94.73 cfs @ 11.95 hrs, Volume= 4.617 of
Outflow = 0.94 cfs @ 20.06 hrs, Volume= 4.565 af, Atten= 99%, Lag= 486.4 min
Primary = 0.94 cfs @ 20.06 hrs, Volume= 4.565 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 704.83' @ 20.06 hrs Surf.Area= 56,906 sf Storage= 158,739 cf
Plug -Flow detention time= 1,977.5 min calculated for 4.565 of (99% of inflow)
Center -of -Mass det. time= 1,970.4 min ( 2,764.5 - 794.1 )
Volume
Invert Avail.Storage Storage Description
#1
701.50'
519,480 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.50
22,118
0
0
702.00
43,792
16,478
16,478
703.00
48,320
46,056
62,534
704.00
52,961
50,641
113,174
705.00
57,717
55,339
168,513
706.00
62,582
60,150
228,663
707.00
67,552
65,067
293,730
708.00
72,628
70,090
363,820
709.00
77,809
75,219
439,038
710.00
83,074
80,442
519,480
Device Routing Invert Outlet Devices
#1 Primary 701.39' 24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1 701.50' 4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1 705.00' 36.0" W x 6.0" H Vert. Slotted Weirs X 2.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=0.94 cfs @ 20.06 hrs HW=704.83' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 0.94 cfs of 22.33 cfs potential flow)
2=4.5" Orifice (Orifice Controls 0.94 cfs @ 8.53 fps)
3=Slotted Weirs ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.50' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 29
'1.71 E:iA19]isIll
Hydrograph
- -- CfS
-
L-L--L-L--L-L--L-
-,--,
-
--,
--,--
, -
----
----L--L-L--L--'--
-,--,
--,--, ---- , --,--, - --, --,-_
-L--L- --L-L-
IN Inflow
IN Outflow
- -
--r-
--r-
--r-
--r-
--r
r r r
----- b`O a_ _
IN Primary
105
- -
---
- ----
--
--
- ----;
-
--;-lnflorware
■Secondary
100-
95
90
--'-
-'--'---'-----------------------
ra e�'F'�-8 /'J� c
9
85
-1-
--r-
--r-
--r-
--r-1--i--
--r
--r r �--r� 1 --
80
-
-
-
-
75
- -
--
-
--
-
--
-
--
-
----
--
- -- ---- - -- - -- - --
70
- -
--
-
--
-
--r-
--
-
-- -
--
- -- ----r- -- - --r- --
65
w 60
-1-
--r-
--r-
--r-
--r-1--i--
--r-
--r--i--r---r-1--r- --
!' 55
- -
---
-
----
--
-
--
-
-------
-------- - -- - -- ----
3 50
- -
--
-
--
-
--
-
--
-
----
--
- -- ---- - -- - -- - --
M 45
- -
7--Ir-
--Ir-
--r-
--Ir-
--Ir-7--Ir----Ir--li--r----Ir-
--r-7--
40
- -
-
-
-
-
-
- - - - - -
35
- -
--
-
--
-
--
-
--
-
----
--
- -- ---- - -- - -- - --
30
-
-
-
-
---
-------------,-- -- ---
25
Z
L--'--L-L--L-L--L-L--
20
1 s
0.94 cfs
0.00
Cfs
0
0
5 10 15
20
25 30
35
40
45
50
55
60
65
70 75
80
85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.50
0.00
0.00
0.00
2.50
0.00
0
701.50
0.00
0.00
0.00
5.00
0.06
45
701.50
0.00
0.00
0.00
7.50
0.47
2,276
701.59
0.02
0.02
0.00
10.00
1.55
9,562
701.83
0.20
0.20
0.00
12.50
7.31
126,364
704.25
0.85
0.85
0.00
15.00
2.18
149,794
704.67
0.92
0.92
0.00
17.50
1.40
156,636
704.79
0.94
0.94
0.00
20.00
0.95
158,738
704.83
0.94
0.94
0.00
22.50
0.85
158,328
704.82
0.94
0.94
0.00
25.00
0.00
154,562
704.76
0.93
0.93
0.00
27.50
0.00
146,280
704.61
0.91
0.91
0.00
30.00
0.00
138,203
704.46
0.89
0.89
0.00
32.50
0.00
130,333
704.32
0.86
0.86
0.00
35.00
0.00
122,674
704.18
0.84
0.84
0.00
37.50
0.00
115,228
704.04
0.82
0.82
0.00
40.00
0.00
107,997
703.90
0.79
0.79
0.00
42.50
0.00
100,984
703.77
0.77
0.77
0.00
45.00
0.00
94,193
703.64
0.74
0.74
0.00
47.50
0.00
87,624
703.51
0.72
0.72
0.00
50.00
0.00
81,282
703.38
0.69
0.69
0.00
52.50
0.00
75,168
703.26
0.67
0.67
0.00
55.00
0.00
69,286
703.14
0.64
0.64
0.00
57.50
0.00
63,637
703.02
0.61
0.61
0.00
60.00
0.00
58,225
702.91
0.59
0.59
0.00
62.50
0.00
53,052
702.80
0.56
0.56
0.00
65.00
0.00
48,121
702.70
0.53
0.53
0.00
67.50
0.00
43,433
702.60
0.51
0.51
0.00
70.00
0.00
38,992
702.50
0.48
0.48
0.00
72.50
0.00
34,799
702.41
0.45
0.45
0.00
75.00
0.00
30,858
702.32
0.42
0.42
0.00
77.50
0.00
27,169
702.24
0.40
0.40
0.00
80.00
0.00
23,736
702.16
0.37
0.37
0.00
82.50
0.00
20,560
702.09
0.34
0.34
0.00
85.00
0.00
17,643
702.03
0.31
0.31
0.00
87.50
0.00
14,987
701.97
0.28
0.28
0.00
90.00
0.00
12,602
701.91
0.25
0.25
0.00
92.50
0.00
10,501
701.85
0.22
0.22
0.00
95.00
0.00
8,709
701.80
0.18
0.18
0.00
97.50
0.00
7,261
701.76
0.14
0.14
0.00
100.00
0.00
6,115
701.73
0.11
0.11
0.00
102.50
0.00
5,210
701.70
0.09
0.09
0.00
105.00
0.00
4,494
701.67
0.07
0.07
0.00
107.50
0.00
3,920
701.65
0.06
0.06
0.00
110.00
0.00
3,456
701.64
0.05
0.05
0.00
112.50
0.00
3,077
701.62
0.04
0.04
0.00
115.00
0.00
2,763
701.61
0.03
0.03
0.00
117.50
0.00
2,500
701.60
0.03
0.03
0.00
120.00
0.00
2,278
701.59
0.02
0.02
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 31
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.50
0.00
0.00
0.00
701.60
0.03
0.03
0.00
701.70
0.09
0.09
0.00
701.80
0.18
0.18
0.00
701.90
0.25
0.25
0.00
702.00
0.30
0.30
0.00
702.10
0.34
0.34
0.00
702.20
0.38
0.38
0.00
702.30
0.42
0.42
0.00
702.40
0.45
0.45
0.00
702.50
0.48
0.48
0.00
702.60
0.51
0.51
0.00
702.70
0.54
0.54
0.00
702.80
0.56
0.56
0.00
702.90
0.59
0.59
0.00
703.00
0.61
0.61
0.00
703.10
0.63
0.63
0.00
703.20
0.65
0.65
0.00
703.30
0.68
0.68
0.00
703.40
0.70
0.70
0.00
703.50
0.72
0.72
0.00
703.60
0.74
0.74
0.00
703.70
0.75
0.75
0.00
703.80
0.77
0.77
0.00
703.90
0.79
0.79
0.00
704.00
0.81
0.81
0.00
704.10
0.83
0.83
0.00
704.20
0.84
0.84
0.00
704.30
0.86
0.86
0.00
704.40
0.88
0.88
0.00
704.50
0.89
0.89
0.00
704.60
0.91
0.91
0.00
704.70
0.92
0.92
0.00
704.80
0.94
0.94
0.00
704.90
0.95
0.95
0.00
705.00
0.97
0.97
0.00
705.10
1.59
1.59
0.00
705.20
2.72
2.72
0.00
705.30
4.18
4.18
0.00
705.40
5.90
5.90
0.00
705.50
7.85
7.85
0.00
705.60
9.39
9.39
0.00
705.70
10.62
10.62
0.00
705.80
11.69
11.69
0.00
705.90
12.66
12.66
0.00
706.00
13.55
13.55
0.00
706.10
14.39
14.39
0.00
706.20
15.17
15.17
0.00
706.30
15.91
15.91
0.00
706.40
16.61
16.61
0.00
706.50
17.29
17.29
0.00
706.60
17.94
17.94
0.00
706.70
18.56
18.56
0.00
706.80
19.17
19.17
0.00
706.90
19.75
19.75
0.00
707.00
20.32
20.32
0.00
707.10
20.87
20.87
0.00
707.20
21.41
21.41
0.00
707.30
21.93
21.93
0.00
707.40
22.44
22.44
0.00
707.50
22.94
22.94
0.00
707.60
23.43
23.43
0.00
707.70
23.90
23.90
0.00
707.80
24.37
24.37
0.00
707.90
24.83
24.83
0.00
708.00
25.28
25.28
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.10
27.38
27.38
0.00
708.20
30.84
30.84
0.00
708.30
35.18
35.18
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 32
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.50
22,118
0
701.60
26,453
2,429
701.70
30,788
5,291
701.80
35,122
8,586
701.90
39,457
12,315
702.00
43,792
16,478
702.10
44,245
20,879
702.20
44,698
25,326
702.30
45,150
29,819
702.40
45,603
34,357
702.50
46,056
38,940
702.60
46,509
43,568
702.70
46,962
48,241
702.80
47,414
52,960
702.90
47,867
57,724
703.00
48,320
62,534
703.10
48,784
67,389
703.20
49,248
72,290
703.30
49,712
77,238
703.40
50,176
82,233
703.50
50,641
87,274
703.60
51,105
92,361
703.70
51,569
97,495
703.80
52,033
102,675
703.90
52,497
107,901
704.00
52,961
113,174
704.10
53,437
118,494
704.20
53,912
123,861
704.30
54,388
129,276
704.40
54,863
134,739
704.50
55,339
140,249
704.60
55,815
145,807
704.70
56,290
151,412
704.80
56,766
157,065
704.90
57,241
162,765
705.00
57,717
168,513
705.10
58,204
174,309
705.20
58,690
180,154
705.30
59,176
186,047
705.40
59,663
191,989
705.50
60,150
197,980
705.60
60,636
204,019
705.70
61,123
210,107
705.80
61,609
216,243
705.90
62,095
222,429
706.00
62,582
228,663
706.10
63,079
234,946
706.20
63,576
241,278
706.30
64,073
247,661
706.40
64,570
254,093
706.50
65,067
260,575
706.60
65,564
267,106
706.70
66,061
273,688
706.80
66,558
280,318
706.90
67,055
286,999
707.00
67,552
293,730
707.10
68,060
300,510
707.20
68,567
307,341
707.30
69,075
314,224
707.40
69,582
321,156
707.50
70,090
328,140
707.60
70,598
335,174
707.70
71,105
342,260
707.80
71,613
349,395
707.90
72,120
356,582
708.00
72.628
363.820
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.10
73,146
371,108
708.20
73,664
378,449
708.30
74,182
385,841
708.40
74,700
393,285
708.50
75,219
400,781
708.60
75,737
408,329
708.70
76,255
415,928
708.80
76,773
423,580
708.90
77,291
431,283
709.00
77,809
439,038
709.10
78,336
446,845
709.20
78,862
454,705
709.30
79,388
462,618
709.40
79,915
470,583
709.50
80,442
478,601
709.60
80,968
486,671
709.70
81,495
494,794
709.80
82,021
502,970
709.90
82,547
511,198
710.00
83,074
519,480

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 33
Summary for Pond 10P: POND 4
Inflow Area = 10.550 ac, 69.48% Impervious, Inflow Depth = 3.53" for 10yr-24hr event
Inflow = 64.12 cfs @ 11.95 hrs, Volume= 3.103 of
Outflow = 7.53 cfs @ 12.27 hrs, Volume= 3.103 af, Atten= 88%, Lag= 18.8 min
Primary = 7.53 cfs @ 12.27 hrs, Volume= 3.103 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 682.67' @ 12.27 hrs Surf.Area= 20,295 sf Storage= 62,288 cf
Plug -Flow detention time= 159.7 min calculated for 3.103 of (100% of inflow)
Center -of -Mass det. time= 159.1 min ( 956.6 - 797.5 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
120,639 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
4,560
0 0
678.00
5,909
5,235 5,235
679.00
7,780
6,845 12,079
680.00
10,667
9,224 21,303
681.00
14,076
12,372 33,674
682.00
17,710
15,893 49,567
683.00
21,571
19,641 69,208
684.00
25,659
23,615 92,823
685.00
29,973
27,816 120,639
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
677.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
682.50'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#4 Secondary
683.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=7.51 cfs @ 12.27 hrs HW=682.67' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 7.51 cfs of 34.75 cfs potential flow)
2=8" Orifice (Orifice Controls 3.88 cfs @ 11.12 fps)
1
3=Top of OS (Weir Controls 3.63 cfs @ 1.34 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
4=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 34
'0=6 1 gi[1]A191MIX!
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1 1 1
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iiiiii

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 10P: POND 4
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.01
2
677.00
0.00
0.00
0.00
7.50
0.28
928
677.20
0.13
0.13
0.00
10.00
0.99
2,555
677.52
0.72
0.72
0.00
12.50
4.99
61,556
682.63
6.41
6.41
0.00
15.00
1.49
47,224
681.87
3.58
3.58
0.00
17.50
0.96
27,756
680.56
3.02
3.02
0.00
20.00
0.65
11,521
678.93
2.12
2.12
0.00
22.50
0.58
3,314
677.66
0.97
0.97
0.00
25.00
0.00
1,128
677.24
0.19
0.19
0.00
27.50
0.00
431
677.09
0.03
0.03
0.00
30.00
0.00
261
677.06
0.01
0.01
0.00
32.50
0.00
186
677.04
0.01
0.01
0.00
35.00
0.00
144
677.03
0.00
0.00
0.00
37.50
0.00
117
677.03
0.00
0.00
0.00
40.00
0.00
99
677.02
0.00
0.00
0.00
42.50
0.00
86
677.02
0.00
0.00
0.00
45.00
0.00
75
677.02
0.00
0.00
0.00
47.50
0.00
67
677.01
0.00
0.00
0.00
50.00
0.00
61
677.01
0.00
0.00
0.00
52.50
0.00
55
677.01
0.00
0.00
0.00
55.00
0.00
51
677.01
0.00
0.00
0.00
57.50
0.00
47
677.01
0.00
0.00
0.00
60.00
0.00
44
677.01
0.00
0.00
0.00
62.50
0.00
41
677.01
0.00
0.00
0.00
65.00
0.00
38
677.01
0.00
0.00
0.00
67.50
0.00
36
677.01
0.00
0.00
0.00
70.00
0.00
34
677.01
0.00
0.00
0.00
72.50
0.00
33
677.01
0.00
0.00
0.00
75.00
0.00
31
677.01
0.00
0.00
0.00
77.50
0.00
29
677.01
0.00
0.00
0.00
80.00
0.00
28
677.01
0.00
0.00
0.00
82.50
0.00
27
677.01
0.00
0.00
0.00
85.00
0.00
26
677.01
0.00
0.00
0.00
87.50
0.00
25
677.01
0.00
0.00
0.00
90.00
0.00
24
677.01
0.00
0.00
0.00
92.50
0.00
23
677.01
0.00
0.00
0.00
95.00
0.00
22
677.00
0.00
0.00
0.00
97.50
0.00
21
677.00
0.00
0.00
0.00
100.00
0.00
21
677.00
0.00
0.00
0.00
102.50
0.00
20
677.00
0.00
0.00
0.00
105.00
0.00
19
677.00
0.00
0.00
0.00
107.50
0.00
19
677.00
0.00
0.00
0.00
110.00
0.00
18
677.00
0.00
0.00
0.00
112.50
0.00
18
677.00
0.00
0.00
0.00
115.00
0.00
17
677.00
0.00
0.00
0.00
117.50
0.00
17
677.00
0.00
0.00
0.00
120.00
0.00
16
677.00
0.00
0.00
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 36
Stage -Discharge for Pond 10P: POND 4
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.13
0.13
0.00
677.30
0.28
0.28
0.00
677.40
0.47
0.47
0.00
677.50
0.68
0.68
0.00
677.60
0.87
0.87
0.00
677.70
1.02
1.02
0.00
677.80
1.15
1.15
0.00
677.90
1.27
1.27
0.00
678.00
1.37
1.37
0.00
678.10
1.47
1.47
0.00
678.20
1.56
1.56
0.00
678.30
1.65
1.65
0.00
678.40
1.74
1.74
0.00
678.50
1.82
1.82
0.00
678.60
1.89
1.89
0.00
678.70
1.96
1.96
0.00
678.80
2.04
2.04
0.00
678.90
2.10
2.10
0.00
679.00
2.17
2.17
0.00
679.10
2.23
2.23
0.00
679.20
2.30
2.30
0.00
679.30
2.36
2.36
0.00
679.40
2.42
2.42
0.00
679.50
2.47
2.47
0.00
679.60
2.53
2.53
0.00
679.70
2.59
2.59
0.00
679.80
2.64
2.64
0.00
679.90
2.69
2.69
0.00
680.00
2.74
2.74
0.00
680.10
2.80
2.80
0.00
680.20
2.85
2.85
0.00
680.30
2.89
2.89
0.00
680.40
2.94
2.94
0.00
680.50
2.99
2.99
0.00
680.60
3.04
3.04
0.00
680.70
3.08
3.08
0.00
680.80
3.13
3.13
0.00
680.90
3.17
3.17
0.00
681.00
3.22
3.22
0.00
681.10
3.26
3.26
0.00
681.20
3.30
3.30
0.00
681.30
3.35
3.35
0.00
681.40
3.39
3.39
0.00
681.50
3.43
3.43
0.00
681.60
3.47
3.47
0.00
681.70
3.51
3.51
0.00
681.80
3.55
3.55
0.00
681.90
3.59
3.59
0.00
682.00
3.63
3.63
0.00
682.10
3.67
3.67
0.00
682.20
3.71
3.71
0.00
682.30
3.75
3.75
0.00
682.40
3.78
3.78
0.00
682.50
3.82
3.82
0.00
682.60
5.51
5.51
0.00
682.70
8.57
8.57
0.00
682.80
12.53
12.53
0.00
682.90
17.20
17.20
0.00
683.00
22.50
22.50
0.00
683.10
28.35
28.35
0.00
683.20
34.71
34.71
0.00
683.30
36.77
36.77
0.00
683.40
37.08
37.08
0.00
683.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
38.48
37.70
0.79
683.70
40.22
38.00
2.23
683.80
42.45
38.30
4.15
683.90
45.07
38.60
6.48
684.00
48.19
38.89
9.30
684.10
51.73
39.18
12.55
684.20
55.26
39.47
15.78
684.30
59.01
39.76
19.25
684.40
62.97
40.05
22.92
684.50
67.13
40.33
26.80
684.60
71.59
40.62
30.98
684.70
76.26
40.90
35.36
684.80
80.90
41.18
39.72
684.90
85.68
41.45
44.23
685.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 37
Stage -Area -Storage for Pond 10P: POND 4
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
4,560
0
677.10
4,695
463
677.20
4,830
939
677.30
4,965
1,429
677.40
5,100
1,932
677.50
5,235
2,449
677.60
5,369
2,979
677.70
5,504
3,523
677.80
5,639
4,080
677.90
5,774
4,650
678.00
5,909
5,235
678.10
6,096
5,835
678.20
6,283
6,454
678.30
6,470
7,091
678.40
6,657
7,748
678.50
6,845
8,423
678.60
7,032
9,117
678.70
7,219
9,829
678.80
7,406
10,560
678.90
7,593
11,310
679.00
7,780
12,079
679.10
8,069
12,871
679.20
8,357
13,693
679.30
8,646
14,543
679.40
8,935
15,422
679.50
9,224
16,330
679.60
9,512
17,267
679.70
9,801
18,232
679.80
10,090
19,227
679.90
10,378
20,250
680.00
10,667
21,303
680.10
11,008
22,386
680.20
11,349
23,504
680.30
11,690
24,656
680.40
12,031
25,842
680.50
12,372
27,062
680.60
12,712
28,316
680.70
13,053
29,605
680.80
13,394
30,927
680.90
13,735
32,283
681.00
14,076
33,674
681.10
14,439
35,100
681.20
14,803
36,562
681.30
15,166
38,060
681.40
15,530
39,595
681.50
15,893
41,166
681.60
16,256
42,774
681.70
16,620
44,418
681.80
16,983
46,098
681.90
17,347
47,814
682.00
17,710
49,567
682.10
18,096
51,357
682.20
18,482
53,186
682.30
18,868
55,054
682.40
19,254
56,960
682.50
19,641
58,905
682.60
20,027
60,888
682.70
20,413
62,910
682.80
20,799
64,971
682.90
21,185
67,070
683.00
21,571
69,208
683.10
21,980
71,385
683.20
22,389
73,603
683.30
22,797
75,863
683.40
23,206
78,163
683.50
23.615
80.504
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
24,024
82,886
683.70
24,433
85,309
683.80
24,841
87,772
683.90
25,250
90,277
684.00
25,659
92,823
684.10
26,090
95,410
684.20
26,522
98,041
684.30
26,953
100,714
684.40
27,385
103,431
684.50
27,816
106,191
684.60
28,247
108,994
684.70
28,679
111,841
684.80
29,110
114,730
684.90
29,542
117,663
685.00
29,973
120,639

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 38
Summary for Pond 11 P: POST - OUTFALL #2
Inflow Area = 60.330 ac, 54.75% Impervious, Inflow Depth > 2.99" for 10yr-24hr event
Inflow = 40.69 cfs @ 12.19 hrs, Volume= 15.045 of
Primary = 40.69 cfs @ 12.19 hrs, Volume= 15.045 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 11 P: POST - OUTFALL #2
Hydrograph
❑ Inflow
44
-r--�---�--�--r--�--�--�--r--�--�--�--+--r--�---�--�--r--�--�--
-L--1---1--L--L-----'-- --L--L--1--J--1--L--1---1--L--L--+--'--
❑Primary
40.69
cfs-IrtfloW rec a�
40
--
- --;-----1-- --1 -
38
-
-L--L--'---'--L--L--1---1--J--1--L--1-J--1--L--1---'--L--L--L--'--
36
--
--r------- --r-------1--T--Ir----I--T--r-------I--r--Ir----
34
--
----------------------------------------------------------
32
--
--L---------+------- --+-- ------+--L------- --L-- ----
30
--
T--T------- T --T -- ------T--T-----1 T--T-------T--T--Ir----
28
-
- - - - - - - - - - - -
H 26
--
+--+--+-+--+--+--+-+--+--+--+--+-+--+--+----+--+--+--+-+--
24
3 22
LL 20
rt--r--r-------r--r----y--+--r--r-y--+--r-------rt--r--r--I--
18
16
--
1--L--1---'--L--L--'---'--L--L--L----J--L--L-------L--L--L--'--
14
--
7--r--li---li----r--Ir--li----r--Ir--li--7--T--r--Ir--li----r--Ir--li--
12
--
--------------------------------------------------------
10
--
L---------+------- --+-- ------+--L------- --L-- ----
8
- -
- - - I- - T - - T - - - -II - - T - - T - - Ir - - - - T - - T - - T - - - - -II - - T - - T - - Ir - - - -
6
- -
-------------- --------- ---- - ---- - --
--- - - - - - - -
4
2
0
0 5
10
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 39
Hydrograph for Pond 11 P: POST - OUTFALL #2
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.01
0.01
7.00
0.10
0.10
8.00
0.33
0.33
9.00
0.73
0.73
10.00
1.24
1.24
11.00
1.99
1.99
12.00
15.16
15.16
13.00
16.30
16.30
14.00
10.53
10.53
15.00
8.80
8.80
16.00
7.74
7.74
17.00
6.96
6.96
18.00
6.36
6.36
19.00
5.72
5.72
20.00
5.01
5.01
21.00
4.35
4.35
22.00
3.79
3.79
23.00
3.36
3.36
24.00
3.12
3.12
25.00
2.21
2.21
26.00
2.07
2.07
27.00
2.01
2.01
28.00
1.97
1.97
29.00
1.93
1.93
30.00
1.90
1.90
31.00
1.87
1.87
32.00
1.84
1.84
33.00
1.81
1.81
34.00
1.78
1.78
35.00
1.75
1.75
36.00
1.72
1.72
37.00
1.69
1.69
38.00
1.67
1.67
39.00
1.64
1.64
40.00
1.61
1.61
41.00
1.58
1.58
42.00
1.55
1.55
43.00
1.52
1.52
44.00
1.49
1.49
45.00
1.46
1.46
46.00
1.43
1.43
47.00
1.40
1.40
48.00
1.37
1.37
49.00
1.33
1.33
50.00
1.30
1.30
51.00
1.27
1.27
52.00
1.24
1.24
53.00
1.21
1.21
54.00
1.18
1.18
55.00
1.14
1.14
56.00
1.11
1.11
57.00
1.08
1.08
58.00
1.05
1.05
59.00
1.01
1.01
60.00
0.98
0.98
61.00
0.95
0.95
62.00
0.91
0.91
63.00
0.88
0.88
64.00
0.85
0.85
65.00
0.81
0.81
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.78
0.78
67.00
0.75
0.75
68.00
0.71
0.71
69.00
0.68
0.68
70.00
0.64
0.64
71.00
0.61
0.61
72.00
0.58
0.58
73.00
0.55
0.55
74.00
0.53
0.53
75.00
0.50
0.50
76.00
0.48
0.48
77.00
0.46
0.46
78.00
0.45
0.45
79.00
0.43
0.43
80.00
0.41
0.41
81.00
0.40
0.40
82.00
0.38
0.38
83.00
0.37
0.37
84.00
0.35
0.35
85.00
0.34
0.34
86.00
0.32
0.32
87.00
0.31
0.31
88.00
0.30
0.30
89.00
0.28
0.28
90.00
0.27
0.27
91.00
0.25
0.25
92.00
0.24
0.24
93.00
0.23
0.23
94.00
0.21
0.21
95.00
0.19
0.19
96.00
0.18
0.18
97.00
0.16
0.16
98.00
0.15
0.15
99.00
0.13
0.13
100.00
0.12
0.12
101.00
0.11
0.11
102.00
0.10
0.10
103.00
0.09
0.09
104.00
0.09
0.09
105.00
0.08
0.08
106.00
0.07
0.07
107.00
0.07
0.07
108.00
0.06
0.06
109.00
0.06
0.06
110.00
0.05
0.05
111.00
0.05
0.05
112.00
0.05
0.05
113.00
0.04
0.04
114.00
0.04
0.04
115.00
0.04
0.04
116.00
0.03
0.03
117.00
0.03
0.03
118.00
0.03
0.03
119.00
0.03
0.03
120.00
0.03
0.03

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 40
Summary for Pond 13P: POND 1
Inflow Area = 36.370 ac, 81.50% Impervious, Inflow Depth = 3.94" for 10yr-24hr event
Inflow = 238.99 cfs @ 11.95 hrs, Volume= 11.951 of
Outflow = 40.96 cfs @ 12.14 hrs, Volume= 11.942 af, Atten= 83%, Lag= 11.2 min
Primary = 40.96 cfs @ 12.14 hrs, Volume= 11.942 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 707.75' @ 12.14 hrs Surf.Area= 53,428 sf Storage= 258,505 cf
Plug -Flow detention time= 301.6 min calculated for 11.942 of (100% of inflow)
Center -of -Mass det. time= 301.0 min ( 1,083.9 - 782.9 )
Volume
Invert Avail.Storage Storage Description
#1
701.00'
393,227 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.00
22,606
0
0
702.00
30,532
26,569
26,569
703.00
33,334
31,933
58,502
704.00
36,378
34,856
93,358
705.00
39,732
38,055
131,413
706.00
43,988
41,860
173,273
707.00
49,187
46,588
219,861
708.00
54,818
52,003
271,863
709.00
60,624
57,721
329,584
710.00
66,662
63,643
393,227
Device Routing Invert Outlet Devices
#1 Primary 700.39' 36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 700.39' / 700.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1 701.00' 10.0" Vert. 8" Orifice C= 0.600
#3 Device 1 706.00' 36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=40.91 cfs @ 12.14 hrs HW=707.75' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 40.91 cfs of 82.39 cfs potential flow)
2=8" Orifice (Orifice Controls 6.61 cfs @ 12.12 fps)
3=Orifice/Grate (Orifice Controls 34.31 cfs @ 5.72 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 41
'0=6 1 IC AZORII7i
Hydrograph
238.99 Cfs ■ inflow
-J--J- -- -J--J-----J--J-J--J -'---J-c-J--/-�L-J- ■Outflow
- �aflow rAr�ea=36,37-0 at - ■ Primary
-J- J--r-J--r-�--r-J--r-J--�- � r r Secondary
260 r�
240 - - --- ---- - -- ---- - -- ---- -F�ea f] eV=7-07.7-51 -
220 Storage=2�58,SOS cf
200 --'- -'--'I--'--'I--'--'I--'--'I--'--'I --'11 --'11 -_--'I --'11 --'11 --'1
-J- J--�-J--�-�--�-J--�-J--i--J--�-J--�--i--�-J--�-J--�-J--
180
J--�-J--�-�--�-J--�-J--i--J--�-J--�--i--�-J--�-J--�-J--
140
--i --i--i ---i --i--i ---i --i--i --i--i --i--i --i--i ---i --i--
0 120
100
80
40.96 cfs - �- -- -- �- -- - - �- -- --
60
40
0.00 Cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 13P: POND 1
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.00
0.00
0.00
0.00
2.50
0.00
0
701.00
0.00
0.00
0.00
5.00
0.54
1,403
701.06
0.02
0.02
0.00
7.50
1.68
9,461
701.39
0.54
0.54
0.00
10.00
4.59
24,596
701.93
1.89
1.89
0.00
12.50
18.07
241,101
707.42
36.45
36.45
0.00
15.00
5.34
178,146
706.11
6.74
6.74
0.00
17.50
3.41
163,477
705.77
5.48
5.48
0.00
20.00
2.32
141,386
705.25
5.14
5.14
0.00
22.50
2.08
116,755
704.63
4.70
4.70
0.00
25.00
0.00
88,131
703.86
4.10
4.10
0.00
27.50
0.00
55,220
702.90
3.20
3.20
0.00
30.00
0.00
30,749
702.14
2.23
2.23
0.00
32.50
0.00
15,384
701.61
1.15
1.15
0.00
35.00
0.00
8,668
701.36
0.46
0.46
0.00
37.50
0.00
5,754
701.24
0.22
0.22
0.00
40.00
0.00
4,232
701.18
0.13
0.13
0.00
42.50
0.00
3,320
701.14
0.08
0.08
0.00
45.00
0.00
2,720
701.12
0.06
0.06
0.00
47.50
0.00
2,298
701.10
0.04
0.04
0.00
50.00
0.00
1,987
701.09
0.03
0.03
0.00
52.50
0.00
1,748
701.08
0.02
0.02
0.00
55.00
0.00
1,559
701.07
0.02
0.02
0.00
57.50
0.00
1,406
701.06
0.02
0.02
0.00
60.00
0.00
1,280
701.06
0.01
0.01
0.00
62.50
0.00
1,175
701.05
0.01
0.01
0.00
65.00
0.00
1,085
701.05
0.01
0.01
0.00
67.50
0.00
1,008
701.04
0.01
0.01
0.00
70.00
0.00
941
701.04
0.01
0.01
0.00
72.50
0.00
882
701.04
0.01
0.01
0.00
75.00
0.00
830
701.04
0.01
0.01
0.00
77.50
0.00
784
701.03
0.00
0.00
0.00
80.00
0.00
742
701.03
0.00
0.00
0.00
82.50
0.00
705
701.03
0.00
0.00
0.00
85.00
0.00
671
701.03
0.00
0.00
0.00
87.50
0.00
640
701.03
0.00
0.00
0.00
90.00
0.00
612
701.03
0.00
0.00
0.00
92.50
0.00
587
701.03
0.00
0.00
0.00
95.00
0.00
563
701.02
0.00
0.00
0.00
97.50
0.00
541
701.02
0.00
0.00
0.00
100.00
0.00
521
701.02
0.00
0.00
0.00
102.50
0.00
502
701.02
0.00
0.00
0.00
105.00
0.00
485
701.02
0.00
0.00
0.00
107.50
0.00
468
701.02
0.00
0.00
0.00
110.00
0.00
453
701.02
0.00
0.00
0.00
112.50
0.00
439
701.02
0.00
0.00
0.00
115.00
0.00
425
701.02
0.00
0.00
0.00
117.50
0.00
413
701.02
0.00
0.00
0.00
120.00
0.00
401
701.02
0.00
0.00
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 43
Stage -Discharge for Pond 13P: POND 1
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.00
0.00
0.00
0.00
701.10
0.04
0.04
0.00
701.20
0.15
0.15
0.00
701.30
0.33
0.33
0.00
701.40
0.56
0.56
0.00
701.50
0.82
0.82
0.00
701.60
1.11
1.11
0.00
701.70
1.39
1.39
0.00
701.80
1.64
1.64
0.00
701.90
1.83
1.83
0.00
702.00
2.01
2.01
0.00
702.10
2.17
2.17
0.00
702.20
2.32
2.32
0.00
702.30
2.47
2.47
0.00
702.40
2.60
2.60
0.00
702.50
2.73
2.73
0.00
702.60
2.86
2.86
0.00
702.70
2.98
2.98
0.00
702.80
3.09
3.09
0.00
702.90
3.20
3.20
0.00
703.00
3.30
3.30
0.00
703.10
3.41
3.41
0.00
703.20
3.51
3.51
0.00
703.30
3.60
3.60
0.00
703.40
3.70
3.70
0.00
703.50
3.79
3.79
0.00
703.60
3.88
3.88
0.00
703.70
3.97
3.97
0.00
703.80
4.05
4.05
0.00
703.90
4.14
4.14
0.00
704.00
4.22
4.22
0.00
704.10
4.30
4.30
0.00
704.20
4.38
4.38
0.00
704.30
4.46
4.46
0.00
704.40
4.54
4.54
0.00
704.50
4.61
4.61
0.00
704.60
4.69
4.69
0.00
704.70
4.76
4.76
0.00
704.80
4.83
4.83
0.00
704.90
4.90
4.90
0.00
705.00
4.97
4.97
0.00
705.10
5.04
5.04
0.00
705.20
5.11
5.11
0.00
705.30
5.18
5.18
0.00
705.40
5.24
5.24
0.00
705.50
5.31
5.31
0.00
705.60
5.37
5.37
0.00
705.70
5.44
5.44
0.00
705.80
5.50
5.50
0.00
705.90
5.56
5.56
0.00
706.00
5.62
5.62
0.00
706.10
6.60
6.60
0.00
706.20
8.33
8.33
0.00
706.30
10.55
10.55
0.00
706.40
13.17
13.17
0.00
706.50
16.14
16.14
0.00
706.60
19.41
19.41
0.00
706.70
22.78
22.78
0.00
706.80
25.36
25.36
0.00
706.90
27.56
27.56
0.00
707.00
29.54
29.54
0.00
707.10
31.35
31.35
0.00
707.20
33.04
33.04
0.00
707.30
34.63
34.63
0.00
707.40
36.14
36.14
0.00
707.50
37.57
37.57
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
707.60
38.95
38.95
0.00
707.70
40.27
40.27
0.00
707.80
41.55
41.55
0.00
707.90
42.78
42.78
0.00
708.00
43.97
43.97
0.00
708.10
46.79
46.79
0.00
708.20
50.94
50.94
0.00
708.30
55.95
55.95
0.00
708.40
61.66
61.66
0.00
708.50
67.97
67.97
0.00
708.60
75.60
74.81
0.79
708.70
84.36
82.14
2.23
708.80
93.62
89.47
4.15
708.90
96.59
90.11
6.48
709.00
100.05
90.75
9.30
709.10
103.94
91.39
12.55
709.20
107.80
92.02
15.78
709.30
111.90
92.65
19.25
709.40
116.20
93.27
22.92
709.50
120.69
93.89
26.80
709.60
125.48
94.50
30.98
709.70
130.48
95.12
35.36
709.80
135.45
95.72
39.72
709.90
140.55
96.33
44.23
710.00
145.70
96.93
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 44
Stage -Area -Storage for Pond 13P: POND 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.00
22,606
0
701.10
23,399
2,300
701.20
24,191
4,680
701.30
24,984
7,138
701.40
25,776
9,676
701.50
26,569
12,294
701.60
27,362
14,990
701.70
28,154
17,766
701.80
28,947
20,621
701.90
29,739
23,555
702.00
30,532
26,569
702.10
30,812
29,636
702.20
31,092
32,731
702.30
31,373
35,855
702.40
31,653
39,006
702.50
31,933
42,185
702.60
32,213
45,393
702.70
32,493
48,628
702.80
32,774
51,891
702.90
33,054
55,183
703.00
33,334
58,502
703.10
33,638
61,851
703.20
33,943
65,230
703.30
34,247
68,639
703.40
34,552
72,079
703.50
34,856
75,550
703.60
35,160
79,050
703.70
35,465
82,582
703.80
35,769
86,143
703.90
36,074
89,735
704.00
36,378
93,358
704.10
36,713
97,013
704.20
37,049
100,701
704.30
37,384
104,422
704.40
37,720
108,178
704.50
38,055
111,966
704.60
38,390
115,789
704.70
38,726
119,644
704.80
39,061
123,534
704.90
39,397
127,457
705.00
39,732
131,413
705.10
40,158
135,407
705.20
40,583
139,445
705.30
41,009
143,524
705.40
41,434
147,646
705.50
41,860
151,811
705.60
42,286
156,018
705.70
42,711
160,268
705.80
43,137
164,561
705.90
43,562
168,895
706.00
43,988
173,273
706.10
44,508
177,698
706.20
45,028
182,175
706.30
45,548
186,703
706.40
46,068
191,284
706.50
46,588
195,917
706.60
47,107
200,602
706.70
47,627
205,338
706.80
48,147
210,127
706.90
48,667
214,968
707.00
49,187
219,861
707.10
49,750
224,807
707.20
50,313
229,811
707.30
50,876
234,870
707.40
51,439
239,986
707.50
52.003
245.158
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
707.60
52,566
250,386
707.70
53,129
255,671
707.80
53,692
261,012
707.90
54,255
266,409
708.00
54,818
271,863
708.10
55,399
277,374
708.20
55,979
282,943
708.30
56,560
288,570
708.40
57,140
294,255
708.50
57,721
299,998
708.60
58,302
305,799
708.70
58,882
311,658
708.80
59,463
317,575
708.90
60,043
323,551
709.00
60,624
329,584
709.10
61,228
335,677
709.20
61,832
341,830
709.30
62,435
348,043
709.40
63,039
354,317
709.50
63,643
360,651
709.60
64,247
367,045
709.70
64,851
373,500
709.80
65,454
380,015
709.90
66,058
386,591
710.00
66,662
393,227

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 45
Summary for Pond 15P: POND 6
Inflow Area = 13.860 ac, 74.39% Impervious, Inflow Depth = 3.73" for 10yr-24hr event
Inflow = 87.79 cfs @ 11.95 hrs, Volume= 4.312 of
Outflow = 6.77 cfs @ 12.50 hrs, Volume= 4.300 af, Atten= 92%, Lag= 32.8 min
Primary = 6.77 cfs @ 12.50 hrs, Volume= 4.300 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 680.19' @ 12.50 hrs Surf.Area= 37,545 sf Storage= 103,430 cf
Plug -Flow detention time= 326.4 min calculated for 4.300 of (100% of inflow)
Center -of -Mass det. time= 324.5 min ( 1,115.1 - 790.6 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
270,951 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
27,493
0 0
678.00
30,495
28,994 28,994
679.00
33,652
32,074 61,068
680.00
36,914
35,283 96,351
681.00
40,232
38,573 134,924
682.00
43,608
41,920 176,844
683.00
47,039
45,324 222,167
684.00
50,528
48,784 270,951
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1
677.00'
10.0" Vert. 8" Orifice C= 0.600
#3 Device 1
680.00'
36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
682.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
682.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=6.77 cfs @ 12.50 hrs HW=680.19' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 6.77 cfs of 46.69 cfs potential flow)
2=8" Orifice (Orifice Controls 4.37 cfs @ 8.02 fps)
3=Orifice/Grate (Orifice Controls 2.40 cfs @ 1.40 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 46
'0=6 1 gMiMR09]i:I1I:j
Hydrograph
i
-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 15P: POND 6
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.10
136
677.00
0.00
0.00
0.00
7.50
0.49
2,632
677.10
0.04
0.04
0.00
10.00
1.52
9,300
677.33
0.40
0.40
0.00
12.50
6.73
103,430
680.19
6.77
6.77
0.00
15.00
2.00
88,919
679.80
4.05
4.05
0.00
17.50
1.28
68,649
679.22
3.53
3.53
0.00
20.00
0.87
49,290
678.64
2.91
2.91
0.00
22.50
0.78
33,504
678.15
2.24
2.24
0.00
25.00
0.00
20,706
677.72
1.46
1.46
0.00
27.50
0.00
11,918
677.42
0.62
0.62
0.00
30.00
0.00
8,003
677.29
0.30
0.30
0.00
32.50
0.00
5,936
677.21
0.17
0.17
0.00
35.00
0.00
4,687
677.17
0.11
0.11
0.00
37.50
0.00
3,859
677.14
0.08
0.08
0.00
40.00
0.00
3,274
677.12
0.06
0.06
0.00
42.50
0.00
2,839
677.10
0.04
0.04
0.00
45.00
0.00
2,504
677.09
0.03
0.03
0.00
47.50
0.00
2,239
677.08
0.03
0.03
0.00
50.00
0.00
2,023
677.07
0.02
0.02
0.00
52.50
0.00
1,845
677.07
0.02
0.02
0.00
55.00
0.00
1,695
677.06
0.02
0.02
0.00
57.50
0.00
1,568
677.06
0.01
0.01
0.00
60.00
0.00
1,458
677.05
0.01
0.01
0.00
62.50
0.00
1,362
677.05
0.01
0.01
0.00
65.00
0.00
1,278
677.05
0.01
0.01
0.00
67.50
0.00
1,204
677.04
0.01
0.01
0.00
70.00
0.00
1,138
677.04
0.01
0.01
0.00
72.50
0.00
1,078
677.04
0.01
0.01
0.00
75.00
0.00
1,025
677.04
0.01
0.01
0.00
77.50
0.00
976
677.04
0.01
0.01
0.00
80.00
0.00
932
677.03
0.00
0.00
0.00
82.50
0.00
892
677.03
0.00
0.00
0.00
85.00
0.00
855
677.03
0.00
0.00
0.00
87.50
0.00
821
677.03
0.00
0.00
0.00
90.00
0.00
789
677.03
0.00
0.00
0.00
92.50
0.00
760
677.03
0.00
0.00
0.00
95.00
0.00
733
677.03
0.00
0.00
0.00
97.50
0.00
708
677.03
0.00
0.00
0.00
100.00
0.00
684
677.02
0.00
0.00
0.00
102.50
0.00
662
677.02
0.00
0.00
0.00
105.00
0.00
641
677.02
0.00
0.00
0.00
107.50
0.00
622
677.02
0.00
0.00
0.00
110.00
0.00
603
677.02
0.00
0.00
0.00
112.50
0.00
586
677.02
0.00
0.00
0.00
115.00
0.00
570
677.02
0.00
0.00
0.00
117.50
0.00
554
677.02
0.00
0.00
0.00
120.00
0.00
540
677.02
0.00
0.00
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 48
Stage -Discharge for Pond 15P: POND 6
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.15
0.15
0.00
677.30
0.33
0.33
0.00
677.40
0.56
0.56
0.00
677.50
0.82
0.82
0.00
677.60
1.11
1.11
0.00
677.70
1.39
1.39
0.00
677.80
1.64
1.64
0.00
677.90
1.83
1.83
0.00
678.00
2.01
2.01
0.00
678.10
2.17
2.17
0.00
678.20
2.32
2.32
0.00
678.30
2.47
2.47
0.00
678.40
2.60
2.60
0.00
678.50
2.73
2.73
0.00
678.60
2.86
2.86
0.00
678.70
2.98
2.98
0.00
678.80
3.09
3.09
0.00
678.90
3.20
3.20
0.00
679.00
3.30
3.30
0.00
679.10
3.41
3.41
0.00
679.20
3.51
3.51
0.00
679.30
3.60
3.60
0.00
679.40
3.70
3.70
0.00
679.50
3.79
3.79
0.00
679.60
3.88
3.88
0.00
679.70
3.97
3.97
0.00
679.80
4.05
4.05
0.00
679.90
4.14
4.14
0.00
680.00
4.22
4.22
0.00
680.10
5.22
5.22
0.00
680.20
6.97
6.97
0.00
680.30
9.21
9.21
0.00
680.40
11.84
11.84
0.00
680.50
14.83
14.83
0.00
680.60
18.11
18.11
0.00
680.70
21.50
21.50
0.00
680.80
24.10
24.10
0.00
680.90
26.31
26.31
0.00
681.00
28.30
28.30
0.00
681.10
30.13
30.13
0.00
681.20
31.83
31.83
0.00
681.30
33.44
33.44
0.00
681.40
34.95
34.95
0.00
681.50
36.40
36.40
0.00
681.60
37.79
37.79
0.00
681.70
39.12
39.12
0.00
681.80
40.41
40.41
0.00
681.90
41.65
41.65
0.00
682.00
42.86
42.86
0.00
682.10
45.68
45.68
0.00
682.20
49.84
49.84
0.00
682.30
54.87
54.87
0.00
682.40
60.59
60.59
0.00
682.50
66.90
66.90
0.00
682.60
74.54
73.75
0.79
682.70
76.87
74.64
2.23
682.80
79.57
75.42
4.15
682.90
82.66
76.18
6.48
683.00
86.24
76.94
9.30
683.10
90.23
77.69
12.55
683.20
94.21
78.43
15.78
683.30
98.41
79.16
19.25
683.40
102.82
79.89
22.92
683.50
107.41
80.61
26.80
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
112.31
81.33
30.98
683.70
117.40
82.04
35.36
683.80
122.46
82.74
39.72
683.90
127.67
83.44
44.23
684.00
132.90
84.13
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 49
Stage -Area -Storage for Pond 15P: POND 6
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
27,493
0
677.10
27,793
2,764
677.20
28,093
5,559
677.30
28,394
8,383
677.40
28,694
11,237
677.50
28,994
14,122
677.60
29,294
17,036
677.70
29,594
19,981
677.80
29,895
22,955
677.90
30,195
25,960
678.00
30,495
28,994
678.10
30,811
32,059
678.20
31,126
35,156
678.30
31,442
38,285
678.40
31,758
41,445
678.50
32,074
44,636
678.60
32,389
47,859
678.70
32,705
51,114
678.80
33,021
54,400
678.90
33,336
57,718
679.00
33,652
61,068
679.10
33,978
64,449
679.20
34,304
67,863
679.30
34,631
71,310
679.40
34,957
74,789
679.50
35,283
78,301
679.60
35,609
81,846
679.70
35,935
85,423
679.80
36,262
89,033
679.90
36,588
92,675
680.00
36,914
96,351
680.10
37,246
100,058
680.20
37,578
103,800
680.30
37,909
107,574
680.40
38,241
111,382
680.50
38,573
115,222
680.60
38,905
119,096
680.70
39,237
123,003
680.80
39,568
126,943
680.90
39,900
130,917
681.00
40,232
134,924
681.10
40,570
138,964
681.20
40,907
143,037
681.30
41,245
147,145
681.40
41,582
151,286
681.50
41,920
155,462
681.60
42,258
159,670
681.70
42,595
163,913
681.80
42,933
168,189
681.90
43,270
172,500
682.00
43,608
176,844
682.10
43,951
181,221
682.20
44,294
185,634
682.30
44,637
190,080
682.40
44,980
194,561
682.50
45,324
199,076
682.60
45,667
203,626
682.70
46,010
208,210
682.80
46,353
212,828
682.90
46,696
217,480
683.00
47,039
222,167
683.10
47,388
226,888
683.20
47,737
231,645
683.30
48,086
236,436
683.40
48,435
241,262
683.50
48.784
246.123
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
49,132
251,018
683.70
49,481
255,949
683.80
49,830
260,915
683.90
50,179
265,915
684.00
50,528
270,951

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 50
Summary for Pond 18P: POST - OUTFALL #1
Inflow Area = 48.760 ac, 68.58% Impervious, Inflow Depth = 3.49" for 10yr-24hr event
Inflow = 75.87 cfs @ 12.00 hrs, Volume= 14.180 of
Primary = 75.87 cfs @ 12.00 hrs, Volume= 14.180 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 18P: POST - OUTFALL #1
Hydrograph
-- ——--r---------r---------+--r------+--r-------rt--r--'r--'i--
❑ Inflow
�
❑ Primary
80
75.87
cfs----------- ------------ -Iore- r��0-a
75
70
65
--
-7--r-----'-- --r--' --'-- --r--' --'----T--r-----'-- --r--' --'--
60
__
55
50
-1--L--1---'--1--L--1---1--J--1--L--1--J--1--L--1---'--1--L--�--'--
45
lL
35
30
25
15
--
-r-------I--r --' --'-- --r--' --'----T--r-----'-- --r--' --'--
-
10
__
5
0
0 5
10
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 51
Hydrograph for Pond 18P: POST - OUTFALL #1
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.02
0.02
6.00
0.11
0.11
7.00
0.36
0.36
8.00
0.75
0.75
9.00
1.32
1.32
10.00
2.02
2.02
11.00
3.34
3.34
12.00
75.87
75.87
13.00
28.02
28.02
14.00
11.61
11.61
15.00
8.10
8.10
16.00
6.69
6.69
17.00
6.48
6.48
18.00
6.26
6.26
19.00
6.02
6.02
20.00
5.76
5.76
21.00
5.56
5.56
22.00
5.36
5.36
23.00
5.16
5.16
24.00
4.95
4.95
25.00
4.10
4.10
26.00
3.75
3.75
27.00
3.39
3.39
28.00
3.01
3.01
29.00
2.62
2.62
30.00
2.23
2.23
31.00
1.82
1.82
32.00
1.38
1.38
33.00
0.95
0.95
34.00
0.65
0.65
35.00
0.46
0.46
36.00
0.34
0.34
37.00
0.26
0.26
38.00
0.20
0.20
39.00
0.16
0.16
40.00
0.13
0.13
41.00
0.10
0.10
42.00
0.09
0.09
43.00
0.07
0.07
44.00
0.06
0.06
45.00
0.06
0.06
46.00
0.05
0.05
47.00
0.04
0.04
48.00
0.04
0.04
49.00
0.03
0.03
50.00
0.03
0.03
51.00
0.03
0.03
52.00
0.02
0.02
53.00
0.02
0.02
54.00
0.02
0.02
55.00
0.02
0.02
56.00
0.02
0.02
57.00
0.02
0.02
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.01
0.01
75.00
0.01
0.01
76.00
0.01
0.01
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 52
Summary for Pond 21 P: POST - OUTFALL #3
Inflow Area = 17.630 ac, 58.48% Impervious, Inflow Depth > 3.19" for 10yr-24hr event
Inflow = 9.64 cfs @ 12.23 hrs, Volume= 4.681 of
Primary = 9.64 cfs @ 12.23 hrs, Volume= 4.681 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 21 P: POST - OUTFALL #3
Hydrograph
-'-----'-- I'I --' --------'I--' --------'-- I'I --'-----'-- I'I ---'-- ❑ Inflow
9.64 CfS ❑ Primary
10 rt--r----------t-------�-- irtfloW r',e�=17,630Ya -
9 I I I I - -'- -'---' - -I 1---I I ----'--
--I Y--Y--_____Y--Y_____--Y--Y--Y----Y--Y--Y-----I--Y Y--Y--I--
i I I I I I I I I I I I I I I I I I I I I I I I
7 __I L__L__I___I__ __L__I___I__J__L__L__I__J__ L__L__I--- I__L__L__L__I__
w 6
i I I I I I I I I I I I I I I I I I I I I I I
Q rj
LL
4-
3-
2-
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 10yr-24hrRainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 53
Hydrograph for Pond 21 P: POST - OUTFALL #3
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.02
0.02
8.00
0.06
0.06
9.00
0.17
0.17
10.00
0.40
0.40
11.00
0.91
0.91
12.00
5.78
5.78
13.00
6.42
6.42
14.00
4.60
4.60
15.00
4.35
4.35
16.00
4.10
4.10
17.00
3.85
3.85
18.00
3.60
3.60
19.00
3.33
3.33
20.00
3.05
3.05
21.00
2.77
2.77
22.00
2.50
2.50
23.00
2.24
2.24
24.00
1.98
1.98
25.00
1.46
1.46
26.00
1.03
1.03
27.00
0.73
0.73
28.00
0.53
0.53
29.00
0.39
0.39
30.00
0.30
0.30
31.00
0.24
0.24
32.00
0.19
0.19
33.00
0.16
0.16
34.00
0.13
0.13
35.00
0.11
0.11
36.00
0.09
0.09
37.00
0.08
0.08
38.00
0.07
0.07
39.00
0.06
0.06
40.00
0.06
0.06
41.00
0.05
0.05
42.00
0.04
0.04
43.00
0.04
0.04
44.00
0.04
0.04
45.00
0.03
0.03
46.00
0.03
0.03
47.00
0.03
0.03
48.00
0.03
0.03
49.00
0.02
0.02
50.00
0.02
0.02
51.00
0.02
0.02
52.00
0.02
0.02
53.00
0.02
0.02
54.00
0.02
0.02
55.00
0.02
0.02
56.00
0.01
0.01
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.01
0.01
75.00
0.01
0.01
76.00
0.01
0.01
77.00
0.01
0.01
78.00
0.01
0.01
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
25-YEAR, 24-HOUR STORM EVENT (PONDS ONLY)

TriWest Building 2 SWM (Wet Ponds) Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Summary for Pond 2P: POND 2
Inflow Area = 19.790 ac, 74.23% Impervious, Inflow Depth = 4.53" for 25yr-24hr event
Inflow = 151.16 cfs @ 11.95 hrs, Volume= 7.470 of
Outflow = 27.76 cfs @ 12.13 hrs, Volume= 7.452 af, Atten= 82%, Lag= 10.4 min
Primary = 27.76 cfs @ 12.13 hrs, Volume= 7.452 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 716.74' @ 12.13 hrs Surf.Area= 33,484 sf Storage= 170,040 cf
Plug -Flow detention time= 703.2 min calculated for 7.452 of (100% of inflow)
Center -of -Mass det. time= 701.6 min ( 1,489.5 - 787.9 )
Volume Invert
Avail.Storage Storage Description
#1 710.50'
290,610 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.50
20,568
0 0
711.00
22,310
10,720 10,720
712.00
24,113
23,212 33,931
713.00
25,975
25,044 58,975
714.00
27,897
26,936 85,911
715.00
29,879
28,888 114,799
716.00
31,920
30,900 145,699
717.00
34,021
32,971 178,669
718.00
36,183
35,102 213,771
719.00
38,404
37,294 251,065
720.00
40,686
39,545 290,610
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.50'
4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Slotted Weirs X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=27.72 cfs @ 12.13 hrs HW=716.74' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 27.72 cfs of 38.12 cfs potential flow)
2=4.5" Orifice (Orifice Controls 1.31 cfs @ 11.85 fps)
3=Slotted Weirs (Orifice Controls 26.42 cfs @ 5.87 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.50' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 25yr-24hr Rainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 2
Pond 2P: POND 2
Hydrograph
151.16 cfS
Outflow
I a low Areea=-19790rae -
IMInflow
Primary
Secondary
160
- -
--------,--
-------,--
-------,--
-- - - -� r-
Peak BeV=r716.74
150
-
-
-
F SIvra�je_'h7�7{040 f
130
-
-
-
I
-
120
- -
--
- --
- --r-
--
- -- - --
- -- ----r- -- - --r- --
110
- -
--
- --
- --r-
--
- -- - --
- -- ----r- -- - --r- --
100
- -
--
- --
- --r--1
r--1
-r--r-r--r----r--1
r-r- -r- -I--
w
90
Z-r-
r--r-r--r-r--r-r--r-r--r-r--r-r--r----r-r--r-r--r-r--
0 80
-,-
--r-
--r-
--r-
--r-,----
--r-
--r----r---r-,--r- --
LL 70
__-----r---r------------r----r------r-�--
60
50
-,-
--r-
-r- --r-
--r-
--r-
--r-,----
--r-
--r-
--r-7--r----r----r----r----r-7--
--r----r---r-,--r- --
ao
27.76 cfs
J'--r-
--
- --
----
- --
---------
- -- ---- - ------r-,-
30
20
0.00
cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.50
0.00
0.00
0.00
2.50
0.00
0
710.50
0.00
0.00
0.00
5.00
0.23
415
710.52
0.00
0.00
0.00
7.50
0.92
5,109
710.74
0.13
0.13
0.00
10.00
2.71
17,464
711.30
0.42
0.42
0.00
12.50
11.53
157,294
716.36
24.04
24.04
0.00
15.00
3.42
120,978
715.21
3.82
3.82
0.00
17.50
2.19
118,453
715.12
2.35
2.35
0.00
20.00
1.49
116,958
715.07
1.67
1.67
0.00
22.50
1.33
116,150
715.05
1.39
1.39
0.00
25.00
0.00
112,132
714.91
1.09
1.09
0.00
27.50
0.00
102,491
714.58
1.05
1.05
0.00
30.00
0.00
93,244
714.26
1.01
1.01
0.00
32.50
0.00
84,400
713.95
0.96
0.96
0.00
35.00
0.00
75,968
713.64
0.91
0.91
0.00
37.50
0.00
67,957
713.34
0.87
0.87
0.00
40.00
0.00
60,377
713.05
0.82
0.82
0.00
42.50
0.00
53,235
712.78
0.77
0.77
0.00
45.00
0.00
46,542
712.51
0.72
0.72
0.00
47.50
0.00
40,305
712.26
0.67
0.67
0.00
50.00
0.00
34,535
712.03
0.62
0.62
0.00
52.50
0.00
29,238
711.80
0.56
0.56
0.00
55.00
0.00
24,423
711.60
0.51
0.51
0.00
57.50
0.00
20,098
711.41
0.45
0.45
0.00
60.00
0.00
16,269
711.25
0.40
0.40
0.00
62.50
0.00
12,944
711.10
0.34
0.34
0.00
65.00
0.00
10,128
710.97
0.28
0.28
0.00
67.50
0.00
7,828
710.87
0.23
0.23
0.00
70.00
0.00
6,053
710.79
0.17
0.17
0.00
72.50
0.00
4,803
710.73
0.12
0.12
0.00
75.00
0.00
3,928
710.69
0.08
0.08
0.00
77.50
0.00
3,297
710.66
0.06
0.06
0.00
80.00
0.00
2,827
710.64
0.05
0.05
0.00
82.50
0.00
2,467
710.62
0.04
0.04
0.00
85.00
0.00
2,184
710.61
0.03
0.03
0.00
87.50
0.00
1,956
710.59
0.02
0.02
0.00
90.00
0.00
1,770
710.59
0.02
0.02
0.00
92.50
0.00
1,615
710.58
0.02
0.02
0.00
95.00
0.00
1,483
710.57
0.01
0.01
0.00
97.50
0.00
1,371
710.57
0.01
0.01
0.00
100.00
0.00
1,274
710.56
0.01
0.01
0.00
102.50
0.00
1,190
710.56
0.01
0.01
0.00
105.00
0.00
1,116
710.55
0.01
0.01
0.00
107.50
0.00
1,050
710.55
0.01
0.01
0.00
110.00
0.00
991
710.55
0.01
0.01
0.00
112.50
0.00
939
710.55
0.01
0.01
0.00
115.00
0.00
892
710.54
0.01
0.01
0.00
117.50
0.00
849
710.54
0.00
0.00
0.00
120.00
0.00
810
710.54
0.00
0.00
0.00
Type/1 24-hr 25yr-24hr Rainfall=5.90"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.50
0.00
0.00
0.00
710.60
0.03
0.03
0.00
710.70
0.09
0.09
0.00
710.80
0.18
0.18
0.00
710.90
0.25
0.25
0.00
711.00
0.30
0.30
0.00
711.10
0.34
0.34
0.00
711.20
0.38
0.38
0.00
711.30
0.42
0.42
0.00
711.40
0.45
0.45
0.00
711.50
0.48
0.48
0.00
711.60
0.51
0.51
0.00
711.70
0.54
0.54
0.00
711.80
0.56
0.56
0.00
711.90
0.59
0.59
0.00
712.00
0.61
0.61
0.00
712.10
0.63
0.63
0.00
712.20
0.65
0.65
0.00
712.30
0.68
0.68
0.00
712.40
0.70
0.70
0.00
712.50
0.72
0.72
0.00
712.60
0.74
0.74
0.00
712.70
0.75
0.75
0.00
712.80
0.77
0.77
0.00
712.90
0.79
0.79
0.00
713.00
0.81
0.81
0.00
713.10
0.83
0.83
0.00
713.20
0.84
0.84
0.00
713.30
0.86
0.86
0.00
713.40
0.88
0.88
0.00
713.50
0.89
0.89
0.00
713.60
0.91
0.91
0.00
713.70
0.92
0.92
0.00
713.80
0.94
0.94
0.00
713.90
0.95
0.95
0.00
714.00
0.97
0.97
0.00
714.10
0.98
0.98
0.00
714.20
1.00
1.00
0.00
714.30
1.01
1.01
0.00
714.40
1.02
1.02
0.00
714.50
1.04
1.04
0.00
714.60
1.05
1.05
0.00
714.70
1.07
1.07
0.00
714.80
1.08
1.08
0.00
714.90
1.09
1.09
0.00
715.00
1.10
1.10
0.00
715.10
2.03
2.03
0.00
715.20
3.71
3.71
0.00
715.30
5.89
5.89
0.00
715.40
8.46
8.46
0.00
715.50
11.38
11.38
0.00
715.60
13.69
13.69
0.00
715.70
15.53
15.53
0.00
715.80
17.13
17.13
0.00
715.90
18.57
18.57
0.00
716.00
19.90
19.90
0.00
716.10
21.14
21.14
0.00
716.20
22.31
22.31
0.00
716.30
23.41
23.41
0.00
716.40
24.46
24.46
0.00
716.50
25.47
25.47
0.00
716.60
26.43
26.43
0.00
716.70
27.36
27.36
0.00
716.80
28.26
28.26
0.00
716.90
29.13
29.13
0.00
717.00
29.97
29.97
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
717.10
30.80
30.80
0.00
717.20
31.59
31.59
0.00
717.30
32.37
32.37
0.00
717.40
33.13
33.13
0.00
717.50
33.87
33.87
0.00
717.60
34.60
34.60
0.00
717.70
35.31
35.31
0.00
717.80
36.00
36.00
0.00
717.90
36.69
36.69
0.00
718.00
37.36
37.36
0.00
718.10
39.67
39.67
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM (Wet Ponds) Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.50
20,568
0
710.60
20,916
2,074
710.70
21,265
4,183
710.80
21,613
6,327
710.90
21,962
8,506
711.00
22,310
10,720
711.10
22,490
12,960
711.20
22,671
15,218
711.30
22,851
17,494
711.40
23,031
19,788
711.50
23,212
22,100
711.60
23,392
24,430
711.70
23,572
26,778
711.80
23,752
29,144
711.90
23,933
31,529
712.00
24,113
33,931
712.10
24,299
36,352
712.20
24,485
38,791
712.30
24,672
41,249
712.40
24,858
43,725
712.50
25,044
46,220
712.60
25,230
48,734
712.70
25,416
51,266
712.80
25,603
53,817
712.90
25,789
56,387
713.00
25,975
58,975
713.10
26,167
61,582
713.20
26,359
64,208
713.30
26,552
66,854
713.40
26,744
69,519
713.50
26,936
72,203
713.60
27,128
74,906
713.70
27,320
77,628
713.80
27,513
80,370
713.90
27,705
83,131
714.00
27,897
85,911
714.10
28,095
88,711
714.20
28,293
91,530
714.30
28,492
94,369
714.40
28,690
97,228
714.50
28,888
100,107
714.60
29,086
103,006
714.70
29,284
105,924
714.80
29,483
108,863
714.90
29,681
111,821
715.00
29,879
114,799
715.10
30,083
117,797
715.20
30,287
120,816
715.30
30,491
123,855
715.40
30,695
126,914
715.50
30,900
129,994
715.60
31,104
133,094
715.70
31,308
136,214
715.80
31,512
139,355
715.90
31,716
142,517
716.00
31,920
145,699
716.10
32,130
148,901
716.20
32,340
152,125
716.30
32,550
155,369
716.40
32,760
158,635
716.50
32,971
161,921
716.60
33,181
165,229
716.70
33,391
168,557
716.80
33,601
171,907
716.90
33,811
175,277
717.00
34.021
178.669
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
717.10
34,237
182,082
717.20
34,453
185,516
717.30
34,670
188,973
717.40
34,886
192,450
717.50
35,102
195,950
717.60
35,318
199,471
717.70
35,534
203,013
717.80
35,751
206,578
717.90
35,967
210,164
718.00
36,183
213,771
718.10
36,405
217,400
718.20
36,627
221,052
718.30
36,849
224,726
718.40
37,071
228,422
718.50
37,294
232,140
718.60
37,516
235,881
718.70
37,738
239,643
718.80
37,960
243,428
718.90
38,182
247,235
719.00
38,404
251,065
719.10
38,632
254,916
719.20
38,860
258,791
719.30
39,089
262,688
719.40
39,317
266,609
719.50
39,545
270,552
719.60
39,773
274,518
719.70
40,001
278,506
719.80
40,230
282,518
719.90
40,458
286,552
720.00
40,686
290,610

TriWest Building 2 SWM (Wet Ponds) Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 4.53" for 25yr-24hr event
Inflow = 116.56 cfs @ 11.95 hrs, Volume= 5.760 of
Outflow = 2.71 cfs @ 14.87 hrs, Volume= 5.700 af, Atten= 98%, Lag= 174.9 min
Primary = 2.71 cfs @ 14.87 hrs, Volume= 5.700 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 705.20' @ 14.87 hrs Surf.Area= 58,688 sf Storage= 180,131 cf
Plug -Flow detention time= 1,791.3 min calculated for 5.700 of (99% of inflow)
Center -of -Mass det. time= 1,784.6 min ( 2,572.6 - 787.9 )
Volume
Invert Avail.Storage Storage Description
#1
701.50'
519,480 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.50
22,118
0
0
702.00
43,792
16,478
16,478
703.00
48,320
46,056
62,534
704.00
52,961
50,641
113,174
705.00
57,717
55,339
168,513
706.00
62,582
60,150
228,663
707.00
67,552
65,067
293,730
708.00
72,628
70,090
363,820
709.00
77,809
75,219
439,038
710.00
83,074
80,442
519,480
Device Routing Invert Outlet Devices
#1 Primary 701.39' 24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1 701.50' 4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1 705.00' 36.0" W x 6.0" H Vert. Slotted Weirs X 2.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=2.71 cfs @ 14.87 hrs HW=705.20' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 2.71 cfs of 24.48 cfs potential flow)
2=4.5" Orifice (Orifice Controls 1.00 cfs @ 9.02 fps)
3=Slotted Weirs (Orifice Controls 1.72 cfs @ 1.43 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.50' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 25yr-24hr Rainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 7
Hydrograph
-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r--i--r-r--r-r--r-r--
____ --'--' --'--' --'--
IN Inflow
IN Outflow
- -
--
-
--
-
--
- -- - --r-
/� .,�Crq r
1 nfl" Arr ea—'� &26-0' atv
IN Primary
130
■ Secondary
120
-�-
�--�r-�--�r-�--r-�--it-�--�i
--1--�r
6-�r q 7� //�� //yyr-
Ir ea l e l/ -%V �{�
110
- -
---I
----I
-
--I
----I - --I-----Storade=180�131
cf
100
80
w
u 70
-I-
-1--r--1--r-7--r--1--it--1
--1
F-1--r----F -1 F--1 T- -1--
LL
50
-1---r---r---r---r-1------r---r----r---r-1--r-�--
30
- -
J--L-J--L-L--L-L--L-
--'--
-- - -- --'-- - -- - --L- -
20
2.71 cfs
0.00 Cfs
0
0
5 10 15 20 25
30
35
40
45
50
55 60 65 70 75
80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.50
0.00
0.00
0.00
2.50
0.00
0
701.50
0.00
0.00
0.00
5.00
0.18
320
701.51
0.00
0.00
0.00
7.50
0.71
4,046
701.66
0.06
0.06
0.00
10.00
2.09
14,031
701.94
0.27
0.27
0.00
12.50
8.89
160,064
704.85
0.95
0.95
0.00
15.00
2.63
180,113
705.20
2.71
2.71
0.00
17.50
1.69
176,900
705.14
2.05
2.05
0.00
20.00
1.15
173,763
705.09
1.51
1.51
0.00
22.50
1.03
171,528
705.05
1.20
1.20
0.00
25.00
0.00
167,299
704.98
0.96
0.96
0.00
27.50
0.00
158,716
704.83
0.94
0.94
0.00
30.00
0.00
150,334
704.68
0.92
0.92
0.00
32.50
0.00
142,155
704.53
0.90
0.90
0.00
35.00
0.00
134,183
704.39
0.87
0.87
0.00
37.50
0.00
126,420
704.25
0.85
0.85
0.00
40.00
0.00
118,869
704.11
0.83
0.83
0.00
42.50
0.00
111,532
703.97
0.80
0.80
0.00
45.00
0.00
104,411
703.83
0.78
0.78
0.00
47.50
0.00
97,510
703.70
0.75
0.75
0.00
50.00
0.00
90,832
703.57
0.73
0.73
0.00
52.50
0.00
84,377
703.44
0.70
0.70
0.00
55.00
0.00
78,151
703.32
0.68
0.68
0.00
57.50
0.00
72,154
703.20
0.65
0.65
0.00
60.00
0.00
66,390
703.08
0.63
0.63
0.00
62.50
0.00
60,861
702.97
0.60
0.60
0.00
65.00
0.00
55,570
702.85
0.57
0.57
0.00
67.50
0.00
50,519
702.75
0.55
0.55
0.00
70.00
0.00
45,711
702.65
0.52
0.52
0.00
72.50
0.00
41,149
702.55
0.49
0.49
0.00
75.00
0.00
36,833
702.45
0.47
0.47
0.00
77.50
0.00
32,768
702.37
0.44
0.44
0.00
80.00
0.00
28,954
702.28
0.41
0.41
0.00
82.50
0.00
25,395
702.20
0.38
0.38
0.00
85.00
0.00
22,092
702.13
0.35
0.35
0.00
87.50
0.00
19,047
702.06
0.32
0.32
0.00
90.00
0.00
16,262
702.00
0.29
0.29
0.00
92.50
0.00
13,742
701.94
0.26
0.26
0.00
95.00
0.00
11,501
701.88
0.23
0.23
0.00
97.50
0.00
9,548
701.83
0.20
0.20
0.00
100.00
0.00
7,933
701.78
0.16
0.16
0.00
102.50
0.00
6,645
701.74
0.13
0.13
0.00
105.00
0.00
5,629
701.71
0.10
0.10
0.00
107.50
0.00
4,826
701.68
0.08
0.08
0.00
110.00
0.00
4,187
701.66
0.06
0.06
0.00
112.50
0.00
3,673
701.65
0.05
0.05
0.00
115.00
0.00
3,254
701.63
0.04
0.04
0.00
117.50
0.00
2,910
701.62
0.03
0.03
0.00
120.00
0.00
2,624
701.61
0.03
0.03
0.00
Type/1 24-hr 25yr-24hr Rainfall=5.90"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 9
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.50
0.00
0.00
0.00
701.60
0.03
0.03
0.00
701.70
0.09
0.09
0.00
701.80
0.18
0.18
0.00
701.90
0.25
0.25
0.00
702.00
0.30
0.30
0.00
702.10
0.34
0.34
0.00
702.20
0.38
0.38
0.00
702.30
0.42
0.42
0.00
702.40
0.45
0.45
0.00
702.50
0.48
0.48
0.00
702.60
0.51
0.51
0.00
702.70
0.54
0.54
0.00
702.80
0.56
0.56
0.00
702.90
0.59
0.59
0.00
703.00
0.61
0.61
0.00
703.10
0.63
0.63
0.00
703.20
0.65
0.65
0.00
703.30
0.68
0.68
0.00
703.40
0.70
0.70
0.00
703.50
0.72
0.72
0.00
703.60
0.74
0.74
0.00
703.70
0.75
0.75
0.00
703.80
0.77
0.77
0.00
703.90
0.79
0.79
0.00
704.00
0.81
0.81
0.00
704.10
0.83
0.83
0.00
704.20
0.84
0.84
0.00
704.30
0.86
0.86
0.00
704.40
0.88
0.88
0.00
704.50
0.89
0.89
0.00
704.60
0.91
0.91
0.00
704.70
0.92
0.92
0.00
704.80
0.94
0.94
0.00
704.90
0.95
0.95
0.00
705.00
0.97
0.97
0.00
705.10
1.59
1.59
0.00
705.20
2.72
2.72
0.00
705.30
4.18
4.18
0.00
705.40
5.90
5.90
0.00
705.50
7.85
7.85
0.00
705.60
9.39
9.39
0.00
705.70
10.62
10.62
0.00
705.80
11.69
11.69
0.00
705.90
12.66
12.66
0.00
706.00
13.55
13.55
0.00
706.10
14.39
14.39
0.00
706.20
15.17
15.17
0.00
706.30
15.91
15.91
0.00
706.40
16.61
16.61
0.00
706.50
17.29
17.29
0.00
706.60
17.94
17.94
0.00
706.70
18.56
18.56
0.00
706.80
19.17
19.17
0.00
706.90
19.75
19.75
0.00
707.00
20.32
20.32
0.00
707.10
20.87
20.87
0.00
707.20
21.41
21.41
0.00
707.30
21.93
21.93
0.00
707.40
22.44
22.44
0.00
707.50
22.94
22.94
0.00
707.60
23.43
23.43
0.00
707.70
23.90
23.90
0.00
707.80
24.37
24.37
0.00
707.90
24.83
24.83
0.00
708.00
25.28
25.28
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.10
27.38
27.38
0.00
708.20
30.84
30.84
0.00
708.30
35.18
35.18
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds) Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.50
22,118
0
701.60
26,453
2,429
701.70
30,788
5,291
701.80
35,122
8,586
701.90
39,457
12,315
702.00
43,792
16,478
702.10
44,245
20,879
702.20
44,698
25,326
702.30
45,150
29,819
702.40
45,603
34,357
702.50
46,056
38,940
702.60
46,509
43,568
702.70
46,962
48,241
702.80
47,414
52,960
702.90
47,867
57,724
703.00
48,320
62,534
703.10
48,784
67,389
703.20
49,248
72,290
703.30
49,712
77,238
703.40
50,176
82,233
703.50
50,641
87,274
703.60
51,105
92,361
703.70
51,569
97,495
703.80
52,033
102,675
703.90
52,497
107,901
704.00
52,961
113,174
704.10
53,437
118,494
704.20
53,912
123,861
704.30
54,388
129,276
704.40
54,863
134,739
704.50
55,339
140,249
704.60
55,815
145,807
704.70
56,290
151,412
704.80
56,766
157,065
704.90
57,241
162,765
705.00
57,717
168,513
705.10
58,204
174,309
705.20
58,690
180,154
705.30
59,176
186,047
705.40
59,663
191,989
705.50
60,150
197,980
705.60
60,636
204,019
705.70
61,123
210,107
705.80
61,609
216,243
705.90
62,095
222,429
706.00
62,582
228,663
706.10
63,079
234,946
706.20
63,576
241,278
706.30
64,073
247,661
706.40
64,570
254,093
706.50
65,067
260,575
706.60
65,564
267,106
706.70
66,061
273,688
706.80
66,558
280,318
706.90
67,055
286,999
707.00
67,552
293,730
707.10
68,060
300,510
707.20
68,567
307,341
707.30
69,075
314,224
707.40
69,582
321,156
707.50
70,090
328,140
707.60
70,598
335,174
707.70
71,105
342,260
707.80
71,613
349,395
707.90
72,120
356,582
708.00
72.628
363.820
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.10
73,146
371,108
708.20
73,664
378,449
708.30
74,182
385,841
708.40
74,700
393,285
708.50
75,219
400,781
708.60
75,737
408,329
708.70
76,255
415,928
708.80
76,773
423,580
708.90
77,291
431,283
709.00
77,809
439,038
709.10
78,336
446,845
709.20
78,862
454,705
709.30
79,388
462,618
709.40
79,915
470,583
709.50
80,442
478,601
709.60
80,968
486,671
709.70
81,495
494,794
709.80
82,021
502,970
709.90
82,547
511,198
710.00
83,074
519,480

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
50-YEAR, 24-HOUR STORM EVENT (PONDS ONLY)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Summary for Pond 2P: POND 2
Inflow Area = 19.790 ac, 74.23% Impervious, Inflow Depth = 5.26" for 50yr-24hr event
Inflow = 173.95 cfs @ 11.95 hrs, Volume= 8.680 of
Outflow = 33.96 cfs @ 12.12 hrs, Volume= 8.662 af, Atten= 80%, Lag= 10.2 min
Primary = 33.96 cfs @ 12.12 hrs, Volume= 8.662 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 717.51' @ 12.12 hrs Surf.Area= 35,127 sf Storage= 196,354 cf
Plug -Flow detention time= 614.9 min calculated for 8.658 of (100% of inflow)
Center -of -Mass det. time= 615.5 min ( 1,399.3 - 783.8 )
Volume Invert
Avail.Storage Storage Description
#1 710.50'
290,610 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.50
20,568
0 0
711.00
22,310
10,720 10,720
712.00
24,113
23,212 33,931
713.00
25,975
25,044 58,975
714.00
27,897
26,936 85,911
715.00
29,879
28,888 114,799
716.00
31,920
30,900 145,699
717.00
34,021
32,971 178,669
718.00
36,183
35,102 213,771
719.00
38,404
37,294 251,065
720.00
40,686
39,545 290,610
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.50'
4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Slotted Weirs X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=33.83 cfs @ 12.12 hrs HW=717.49' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 33.83 cfs of 40.32 cfs potential flow)
2=4.5" Orifice (Orifice Controls 1.39 cfs @ 12.56 fps)
3=Slotted Weirs (Orifice Controls 32.45 cfs @ 7.21 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.50' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 50yr-24hr Rainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 2
'0 i glPAA14i
Hydrograph
173.95 Cfs
--!--
-
-!--L
-!----!
----
-----!--- ---- L-!----!--! - --
IN Inflow
- --
- --
- --
- ----
-- - --r --- - -A- -�-/-� - --
Infaow Area=
■Outflow
IN Primary
190
-,-
r--r-
--r-
--r-
--r-,--r
.79Ora l
■Secondary
180
- -
J--L-J--L-L--L-L--r-L----L--r-PeA]Ele4=717
Sot -
170
160
- -
-r-
--r-
r--r-r--r-r--r-r--r-r----r--r
--r-
--r-
--r-
--r-
--L-L----r -
Sorae=19�5 cf -
r--r r r--r r--r r--
1s0
-
-
-
-
- - - - - -
140
130
- -
--
- --
- --
- --
- ----
-- - -- ---- - -- - -- - --
120
w 110
100
0
_ _
_
-'---'
-'---'
-'---'
-'---'
-'--
-'---'------'---' -'---' -'----
90
-�-
�--r-�--r-�--r-�--r-�--L-�--r-�--L--i--r-�--r-�--r-�--
LL 80
-�-
�--Ir-�--Ir-�--r-�--Ir-�--Ir-�--Ir-�--Ir--li--r-�--Ir-�--r-�--
70
_
0
33.96 cfs
�-
--L--r-L--L--1
� �
�
L
-1--
-L-- r -L--r- --L--1 L-1--L--J
�
5
so
40
30
0.00 Cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.50
0.00
0.00
0.00
2.50
0.00
0
710.50
0.00
0.00
0.00
5.00
0.37
915
710.54
0.01
0.01
0.00
7.50
1.19
7,137
710.84
0.21
0.21
0.00
10.00
3.30
22,511
711.52
0.48
0.48
0.00
12.50
13.17
178,369
716.99
29.90
29.90
0.00
15.00
3.89
121,777
715.23
4.36
4.36
0.00
17.50
2.49
119,046
715.14
2.66
2.66
0.00
20.00
1.69
117,473
715.09
1.89
1.89
0.00
22.50
1.52
116,681
715.06
1.57
1.57
0.00
25.00
0.00
112,566
714.93
1.09
1.09
0.00
27.50
0.00
102,908
714.60
1.05
1.05
0.00
30.00
0.00
93,643
714.27
1.01
1.01
0.00
32.50
0.00
84,781
713.96
0.96
0.96
0.00
35.00
0.00
76,331
713.65
0.92
0.92
0.00
37.50
0.00
68,302
713.35
0.87
0.87
0.00
40.00
0.00
60,702
713.07
0.82
0.82
0.00
42.50
0.00
53,541
712.79
0.77
0.77
0.00
45.00
0.00
46,827
712.52
0.72
0.72
0.00
47.50
0.00
40,571
712.27
0.67
0.67
0.00
50.00
0.00
34,779
712.04
0.62
0.62
0.00
52.50
0.00
29,461
711.81
0.56
0.56
0.00
55.00
0.00
24,625
711.61
0.51
0.51
0.00
57.50
0.00
20,278
711.42
0.46
0.46
0.00
60.00
0.00
16,427
711.25
0.40
0.40
0.00
62.50
0.00
13,080
711.11
0.34
0.34
0.00
65.00
0.00
10,242
710.98
0.29
0.29
0.00
67.50
0.00
7,919
710.87
0.23
0.23
0.00
70.00
0.00
6,119
710.79
0.17
0.17
0.00
72.50
0.00
4,849
710.73
0.12
0.12
0.00
75.00
0.00
3,960
710.69
0.08
0.08
0.00
77.50
0.00
3,321
710.66
0.06
0.06
0.00
80.00
0.00
2,845
710.64
0.05
0.05
0.00
82.50
0.00
2,481
710.62
0.04
0.04
0.00
85.00
0.00
2,195
710.61
0.03
0.03
0.00
87.50
0.00
1,966
710.59
0.02
0.02
0.00
90.00
0.00
1,777
710.59
0.02
0.02
0.00
92.50
0.00
1,621
710.58
0.02
0.02
0.00
95.00
0.00
1,489
710.57
0.01
0.01
0.00
97.50
0.00
1,376
710.57
0.01
0.01
0.00
100.00
0.00
1,278
710.56
0.01
0.01
0.00
102.50
0.00
1,193
710.56
0.01
0.01
0.00
105.00
0.00
1,119
710.55
0.01
0.01
0.00
107.50
0.00
1,053
710.55
0.01
0.01
0.00
110.00
0.00
994
710.55
0.01
0.01
0.00
112.50
0.00
941
710.55
0.01
0.01
0.00
115.00
0.00
894
710.54
0.01
0.01
0.00
117.50
0.00
850
710.54
0.00
0.00
0.00
120.00
0.00
811
710.54
0.00
0.00
0.00
Type/1 24-hr 50yr-24hr Rainfall=6.66"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.50
0.00
0.00
0.00
710.60
0.03
0.03
0.00
710.70
0.09
0.09
0.00
710.80
0.18
0.18
0.00
710.90
0.25
0.25
0.00
711.00
0.30
0.30
0.00
711.10
0.34
0.34
0.00
711.20
0.38
0.38
0.00
711.30
0.42
0.42
0.00
711.40
0.45
0.45
0.00
711.50
0.48
0.48
0.00
711.60
0.51
0.51
0.00
711.70
0.54
0.54
0.00
711.80
0.56
0.56
0.00
711.90
0.59
0.59
0.00
712.00
0.61
0.61
0.00
712.10
0.63
0.63
0.00
712.20
0.65
0.65
0.00
712.30
0.68
0.68
0.00
712.40
0.70
0.70
0.00
712.50
0.72
0.72
0.00
712.60
0.74
0.74
0.00
712.70
0.75
0.75
0.00
712.80
0.77
0.77
0.00
712.90
0.79
0.79
0.00
713.00
0.81
0.81
0.00
713.10
0.83
0.83
0.00
713.20
0.84
0.84
0.00
713.30
0.86
0.86
0.00
713.40
0.88
0.88
0.00
713.50
0.89
0.89
0.00
713.60
0.91
0.91
0.00
713.70
0.92
0.92
0.00
713.80
0.94
0.94
0.00
713.90
0.95
0.95
0.00
714.00
0.97
0.97
0.00
714.10
0.98
0.98
0.00
714.20
1.00
1.00
0.00
714.30
1.01
1.01
0.00
714.40
1.02
1.02
0.00
714.50
1.04
1.04
0.00
714.60
1.05
1.05
0.00
714.70
1.07
1.07
0.00
714.80
1.08
1.08
0.00
714.90
1.09
1.09
0.00
715.00
1.10
1.10
0.00
715.10
2.03
2.03
0.00
715.20
3.71
3.71
0.00
715.30
5.89
5.89
0.00
715.40
8.46
8.46
0.00
715.50
11.38
11.38
0.00
715.60
13.69
13.69
0.00
715.70
15.53
15.53
0.00
715.80
17.13
17.13
0.00
715.90
18.57
18.57
0.00
716.00
19.90
19.90
0.00
716.10
21.14
21.14
0.00
716.20
22.31
22.31
0.00
716.30
23.41
23.41
0.00
716.40
24.46
24.46
0.00
716.50
25.47
25.47
0.00
716.60
26.43
26.43
0.00
716.70
27.36
27.36
0.00
716.80
28.26
28.26
0.00
716.90
29.13
29.13
0.00
717.00
29.97
29.97
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
717.10
30.80
30.80
0.00
717.20
31.59
31.59
0.00
717.30
32.37
32.37
0.00
717.40
33.13
33.13
0.00
717.50
33.87
33.87
0.00
717.60
34.60
34.60
0.00
717.70
35.31
35.31
0.00
717.80
36.00
36.00
0.00
717.90
36.69
36.69
0.00
718.00
37.36
37.36
0.00
718.10
39.67
39.67
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.50
20,568
0
710.60
20,916
2,074
710.70
21,265
4,183
710.80
21,613
6,327
710.90
21,962
8,506
711.00
22,310
10,720
711.10
22,490
12,960
711.20
22,671
15,218
711.30
22,851
17,494
711.40
23,031
19,788
711.50
23,212
22,100
711.60
23,392
24,430
711.70
23,572
26,778
711.80
23,752
29,144
711.90
23,933
31,529
712.00
24,113
33,931
712.10
24,299
36,352
712.20
24,485
38,791
712.30
24,672
41,249
712.40
24,858
43,725
712.50
25,044
46,220
712.60
25,230
48,734
712.70
25,416
51,266
712.80
25,603
53,817
712.90
25,789
56,387
713.00
25,975
58,975
713.10
26,167
61,582
713.20
26,359
64,208
713.30
26,552
66,854
713.40
26,744
69,519
713.50
26,936
72,203
713.60
27,128
74,906
713.70
27,320
77,628
713.80
27,513
80,370
713.90
27,705
83,131
714.00
27,897
85,911
714.10
28,095
88,711
714.20
28,293
91,530
714.30
28,492
94,369
714.40
28,690
97,228
714.50
28,888
100,107
714.60
29,086
103,006
714.70
29,284
105,924
714.80
29,483
108,863
714.90
29,681
111,821
715.00
29,879
114,799
715.10
30,083
117,797
715.20
30,287
120,816
715.30
30,491
123,855
715.40
30,695
126,914
715.50
30,900
129,994
715.60
31,104
133,094
715.70
31,308
136,214
715.80
31,512
139,355
715.90
31,716
142,517
716.00
31,920
145,699
716.10
32,130
148,901
716.20
32,340
152,125
716.30
32,550
155,369
716.40
32,760
158,635
716.50
32,971
161,921
716.60
33,181
165,229
716.70
33,391
168,557
716.80
33,601
171,907
716.90
33,811
175,277
717.00
34.021
178.669
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
717.10
34,237
182,082
717.20
34,453
185,516
717.30
34,670
188,973
717.40
34,886
192,450
717.50
35,102
195,950
717.60
35,318
199,471
717.70
35,534
203,013
717.80
35,751
206,578
717.90
35,967
210,164
718.00
36,183
213,771
718.10
36,405
217,400
718.20
36,627
221,052
718.30
36,849
224,726
718.40
37,071
228,422
718.50
37,294
232,140
718.60
37,516
235,881
718.70
37,738
239,643
718.80
37,960
243,428
718.90
38,182
247,235
719.00
38,404
251,065
719.10
38,632
254,916
719.20
38,860
258,791
719.30
39,089
262,688
719.40
39,317
266,609
719.50
39,545
270,552
719.60
39,773
274,518
719.70
40,001
278,506
719.80
40,230
282,518
719.90
40,458
286,552
720.00
40,686
290,610

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 5.26" for 50yr-24hr event
Inflow = 134.13 cfs @ 11.95 hrs, Volume= 6.693 of
Outflow = 5.57 cfs @ 13.22 hrs, Volume= 6.633 af, Atten= 96%, Lag= 76.0 min
Primary = 5.57 cfs @ 13.22 hrs, Volume= 6.633 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 705.38' @ 13.22 hrs Surf.Area= 59,576 sf Storage= 190,923 cf
Plug -Flow detention time= 1,565.9 min calculated for 6.633 of (99% of inflow)
Center -of -Mass det. time= 1,560.1 min ( 2,343.9 - 783.8 )
Volume
Invert Avail.Storage Storage Description
#1
701.50'
519,480 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.50
22,118
0
0
702.00
43,792
16,478
16,478
703.00
48,320
46,056
62,534
704.00
52,961
50,641
113,174
705.00
57,717
55,339
168,513
706.00
62,582
60,150
228,663
707.00
67,552
65,067
293,730
708.00
72,628
70,090
363,820
709.00
77,809
75,219
439,038
710.00
83,074
80,442
519,480
Device Routing Invert Outlet Devices
#1 Primary 701.39' 24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1 701.50' 4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1 705.00' 36.0" W x 6.0" H Vert. Slotted Weirs X 2.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=5.57 cfs @ 13.22 hrs HW=705.38' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 5.57 cfs of 25.48 cfs potential flow)
2=4.5" Orifice (Orifice Controls 1.02 cfs @ 9.26 fps)
3=Slotted Weirs (Orifice Controls 4.55 cfs @ 1.98 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.50' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 50yr-24hr Rainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 7
Hydrograph
134.13 cfS
-
--
-
--
-
--
-
----
--
- -- ---- - -- - -- - -- IN Inflow
IN Outflow
-
-
--L-J--L-1--
-
--
-
--'--
-- - -- --'-- - -- - --L- --
Inflow IAr�ea=�15L2W ac IN Primary
150
■Secondary
140
130
-
-
--
-
--
-
--
-
--
-
----
--
- --- -
StoMde=' 19 a23 cf -
120
1
1 1 1 1 1 f 11 1
110
-
-
--
-
--
-
--r-
--
-
--i-
--
- ----i--r- -- - --r- --
100
-
-
--
-
--
-
--
-
--
-
----
--
- -- ---- - -- - -- - --
90
-
-
J--L-J--L-
--
-J--L-
----J--L-J--L--'--
-J--L---L-J--
u 80
70
-1---1-1--1-1--1-1--1-1--I
---1-1--1----1-1--1-1--1-1--
LL 60
50
-
-
J--L-J--L-
--
-J--L-
----J--L-J--L--'--
-J--L---L-J--
40
20
ZI 5.57 cfs
0.00 cfs
0
0
5 10 15
20 25
30
35
40
45
50
55
60
65
70 75
80
85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.50
0.00
0.00
0.00
2.50
0.00
0
701.50
0.00
0.00
0.00
5.00
0.29
707
701.53
0.00
0.00
0.00
7.50
0.92
5,710
701.71
0.10
0.10
0.00
10.00
2.55
18,041
702.04
0.31
0.31
0.00
12.50
10.15
185,649
705.29
4.07
4.07
0.00
15.00
3.00
185,056
705.28
3.91
3.91
0.00
17.50
1.92
178,643
705.17
2.39
2.39
0.00
20.00
1.31
174,960
705.11
1.70
1.70
0.00
22.50
1.17
172,631
705.07
1.34
1.34
0.00
25.00
0.00
168,238
705.00
0.97
0.97
0.00
27.50
0.00
159,633
704.85
0.94
0.94
0.00
30.00
0.00
151,229
704.70
0.92
0.92
0.00
32.50
0.00
143,028
704.55
0.90
0.90
0.00
35.00
0.00
135,034
704.41
0.88
0.88
0.00
37.50
0.00
127,248
704.26
0.85
0.85
0.00
40.00
0.00
119,674
704.12
0.83
0.83
0.00
42.50
0.00
112,313
703.98
0.81
0.81
0.00
45.00
0.00
105,169
703.85
0.78
0.78
0.00
47.50
0.00
98,245
703.71
0.76
0.76
0.00
50.00
0.00
91,542
703.58
0.73
0.73
0.00
52.50
0.00
85,063
703.46
0.71
0.71
0.00
55.00
0.00
78,812
703.33
0.68
0.68
0.00
57.50
0.00
72,790
703.21
0.66
0.66
0.00
60.00
0.00
67,001
703.09
0.63
0.63
0.00
62.50
0.00
61,446
702.98
0.60
0.60
0.00
65.00
0.00
56,130
702.87
0.58
0.58
0.00
67.50
0.00
51,053
702.76
0.55
0.55
0.00
70.00
0.00
46,219
702.66
0.52
0.52
0.00
72.50
0.00
41,629
702.56
0.50
0.50
0.00
75.00
0.00
37,287
702.46
0.47
0.47
0.00
77.50
0.00
33,195
702.37
0.44
0.44
0.00
80.00
0.00
29,354
702.29
0.41
0.41
0.00
82.50
0.00
25,767
702.21
0.38
0.38
0.00
85.00
0.00
22,436
702.14
0.36
0.36
0.00
87.50
0.00
19,363
702.07
0.33
0.33
0.00
90.00
0.00
16,550
702.00
0.30
0.30
0.00
92.50
0.00
14,001
701.94
0.27
0.27
0.00
95.00
0.00
11,729
701.89
0.24
0.24
0.00
97.50
0.00
9,743
701.83
0.20
0.20
0.00
100.00
0.00
8,091
701.79
0.16
0.16
0.00
102.50
0.00
6,770
701.75
0.13
0.13
0.00
105.00
0.00
5,728
701.71
0.10
0.10
0.00
107.50
0.00
4,904
701.69
0.08
0.08
0.00
110.00
0.00
4,249
701.67
0.06
0.06
0.00
112.50
0.00
3,723
701.65
0.05
0.05
0.00
115.00
0.00
3,296
701.63
0.04
0.04
0.00
117.50
0.00
2,944
701.62
0.04
0.04
0.00
120.00
0.00
2,652
701.61
0.03
0.03
0.00
Type/1 24-hr 50yr-24hr Rainfall=6.66"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 9
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.50
0.00
0.00
0.00
701.60
0.03
0.03
0.00
701.70
0.09
0.09
0.00
701.80
0.18
0.18
0.00
701.90
0.25
0.25
0.00
702.00
0.30
0.30
0.00
702.10
0.34
0.34
0.00
702.20
0.38
0.38
0.00
702.30
0.42
0.42
0.00
702.40
0.45
0.45
0.00
702.50
0.48
0.48
0.00
702.60
0.51
0.51
0.00
702.70
0.54
0.54
0.00
702.80
0.56
0.56
0.00
702.90
0.59
0.59
0.00
703.00
0.61
0.61
0.00
703.10
0.63
0.63
0.00
703.20
0.65
0.65
0.00
703.30
0.68
0.68
0.00
703.40
0.70
0.70
0.00
703.50
0.72
0.72
0.00
703.60
0.74
0.74
0.00
703.70
0.75
0.75
0.00
703.80
0.77
0.77
0.00
703.90
0.79
0.79
0.00
704.00
0.81
0.81
0.00
704.10
0.83
0.83
0.00
704.20
0.84
0.84
0.00
704.30
0.86
0.86
0.00
704.40
0.88
0.88
0.00
704.50
0.89
0.89
0.00
704.60
0.91
0.91
0.00
704.70
0.92
0.92
0.00
704.80
0.94
0.94
0.00
704.90
0.95
0.95
0.00
705.00
0.97
0.97
0.00
705.10
1.59
1.59
0.00
705.20
2.72
2.72
0.00
705.30
4.18
4.18
0.00
705.40
5.90
5.90
0.00
705.50
7.85
7.85
0.00
705.60
9.39
9.39
0.00
705.70
10.62
10.62
0.00
705.80
11.69
11.69
0.00
705.90
12.66
12.66
0.00
706.00
13.55
13.55
0.00
706.10
14.39
14.39
0.00
706.20
15.17
15.17
0.00
706.30
15.91
15.91
0.00
706.40
16.61
16.61
0.00
706.50
17.29
17.29
0.00
706.60
17.94
17.94
0.00
706.70
18.56
18.56
0.00
706.80
19.17
19.17
0.00
706.90
19.75
19.75
0.00
707.00
20.32
20.32
0.00
707.10
20.87
20.87
0.00
707.20
21.41
21.41
0.00
707.30
21.93
21.93
0.00
707.40
22.44
22.44
0.00
707.50
22.94
22.94
0.00
707.60
23.43
23.43
0.00
707.70
23.90
23.90
0.00
707.80
24.37
24.37
0.00
707.90
24.83
24.83
0.00
708.00
25.28
25.28
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.10
27.38
27.38
0.00
708.20
30.84
30.84
0.00
708.30
35.18
35.18
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds) Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.50
22,118
0
701.60
26,453
2,429
701.70
30,788
5,291
701.80
35,122
8,586
701.90
39,457
12,315
702.00
43,792
16,478
702.10
44,245
20,879
702.20
44,698
25,326
702.30
45,150
29,819
702.40
45,603
34,357
702.50
46,056
38,940
702.60
46,509
43,568
702.70
46,962
48,241
702.80
47,414
52,960
702.90
47,867
57,724
703.00
48,320
62,534
703.10
48,784
67,389
703.20
49,248
72,290
703.30
49,712
77,238
703.40
50,176
82,233
703.50
50,641
87,274
703.60
51,105
92,361
703.70
51,569
97,495
703.80
52,033
102,675
703.90
52,497
107,901
704.00
52,961
113,174
704.10
53,437
118,494
704.20
53,912
123,861
704.30
54,388
129,276
704.40
54,863
134,739
704.50
55,339
140,249
704.60
55,815
145,807
704.70
56,290
151,412
704.80
56,766
157,065
704.90
57,241
162,765
705.00
57,717
168,513
705.10
58,204
174,309
705.20
58,690
180,154
705.30
59,176
186,047
705.40
59,663
191,989
705.50
60,150
197,980
705.60
60,636
204,019
705.70
61,123
210,107
705.80
61,609
216,243
705.90
62,095
222,429
706.00
62,582
228,663
706.10
63,079
234,946
706.20
63,576
241,278
706.30
64,073
247,661
706.40
64,570
254,093
706.50
65,067
260,575
706.60
65,564
267,106
706.70
66,061
273,688
706.80
66,558
280,318
706.90
67,055
286,999
707.00
67,552
293,730
707.10
68,060
300,510
707.20
68,567
307,341
707.30
69,075
314,224
707.40
69,582
321,156
707.50
70,090
328,140
707.60
70,598
335,174
707.70
71,105
342,260
707.80
71,613
349,395
707.90
72,120
356,582
708.00
72.628
363.820
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.10
73,146
371,108
708.20
73,664
378,449
708.30
74,182
385,841
708.40
74,700
393,285
708.50
75,219
400,781
708.60
75,737
408,329
708.70
76,255
415,928
708.80
76,773
423,580
708.90
77,291
431,283
709.00
77,809
439,038
709.10
78,336
446,845
709.20
78,862
454,705
709.30
79,388
462,618
709.40
79,915
470,583
709.50
80,442
478,601
709.60
80,968
486,671
709.70
81,495
494,794
709.80
82,021
502,970
709.90
82,547
511,198
710.00
83,074
519,480

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
100-YEAR, 24-HOUR STORM EVENT (PONDS ONLY)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Summary for Pond 2P: POND 2
Inflow Area = 19.790 ac, 74.23% Impervious, Inflow Depth = 6.01" for 100yr-24hr event
Inflow = 196.95 cfs @ 11.95 hrs, Volume= 9.915 of
Outflow = 42.63 cfs @ 12.12 hrs, Volume= 9.896 af, Atten= 78%, Lag= 10.3 min
Primary = 42.63 cfs @ 12.12 hrs, Volume= 9.896 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 718.23' @ 12.11 hrs Surf.Area= 36,697 sf Storage= 222,209 cf
Plug -Flow detention time= 550.8 min calculated for 9.896 of (100% of inflow)
Center -of -Mass det. time= 549.5 min ( 1,329.7 - 780.2 )
Volume Invert
Avail.Storage Storage Description
#1 710.50'
290,610 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.50
20,568
0 0
711.00
22,310
10,720 10,720
712.00
24,113
23,212 33,931
713.00
25,975
25,044 58,975
714.00
27,897
26,936 85,911
715.00
29,879
28,888 114,799
716.00
31,920
30,900 145,699
717.00
34,021
32,971 178,669
718.00
36,183
35,102 213,771
719.00
38,404
37,294 251,065
720.00
40,686
39,545 290,610
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.50'
4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Slotted Weirs X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=42.30 cfs @ 12.12 hrs HW=718.21' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Inlet Controls 42.30 cfs @ 13.47 fps)
2=4.5" Orifice (Passes < 1.46 cfs potential flow)
3=Slotted Weirs (Passes < 37.27 cfs potential flow)
=Top of OS (Passes < 5.05 cfs potential flow)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.50' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 100yr-24hr Rainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 2
Hydrograph
-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--
196.95
cfs
r-y--r-
--r-y--r-y--r-y--r-y--r----r-y--r-y--r-y--
■Inflow
N Outflow
---
---'---'--'---'--------------InflowAr�e�
49,79O,a�-
■Primary
220
- -
--r-
--r-
--r-
--r-
--Ir
ti r
■Secondary
210
200
- -
- -
--------,--
--
- --
-------,--
- --
- --
-------r_-�ga��IF-I��0.Y..7�
- ----
--
-
190
180
- -
- -
-,--r
--
--,--r
- --
- --r
- --
--,--r
- --
------,--r
- ----
--LOKae2A-
-r --,--r - --
170
- -
--r-
--r-
--r-
--r-
--
- --r-
--r----r- --r- --r- --
160
- -
L--L-L--L-
--r-L--L-
----L--
L-L--L----r -L--L---L-L--
150
- -
7--Ir-
--Ir-
--r-
--Ir-
--Ir-7--Ir-
--Ir--li--r- --Ir---r-7--
140
--'-
-'--L-L--'---'--'--L--L--'--'---'--L-L'--'---'--'---'--L--''--'---'--
130120
w
--r-y--Ir-y--Ir-y--Ir-y--Ir--li--r-y--Ir-y--r-y--
110
0
- -
--r-
--r-
--r-
--r-
--r-
--r-
--r--i--r- --r- --r- --
100
- -
---
- ----
--
- --
--------
-------- - -- - -- ----
LL90
- -
--
- --
I_
- --
I_
- --
I_
- ----
I
--
- -- ---- - -- - -- - --
I_ I_ I_ I I_
80
--
--II --Ir
- --
--II --
- --II
--II--
--II --II --II-- --II -- - -- --II--
70
60
42.63 cfs
--
1 -
- --
- r - -
- r
- --
- - - r
- --
- - - r
- ----
- , - -r
--
- 7 -
- -- ---- - -- - -- - --
- r - - - r - -I- - r - - - r - , - - r - 7 -
so
L--L-L--L-�--r-L--L-�--L-L--L-L--L--�--r-L--L-�--r-L--
40
30
0.00 cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.50
0.00
0.00
0.00
2.50
0.00
0
710.50
0.00
0.00
0.00
5.00
0.53
1,589
710.58
0.02
0.02
0.00
7.50
1.48
9,414
710.94
0.27
0.27
0.00
10.00
3.91
28,036
711.75
0.55
0.55
0.00
12.50
14.83
199,767
717.61
34.66
34.66
0.00
15.00
4.37
122,580
715.26
4.93
4.93
0.00
17.50
2.80
119,606
715.16
2.97
2.97
0.00
20.00
1.90
117,950
715.11
2.10
2.10
0.00
22.50
1.70
117,157
715.08
1.75
1.75
0.00
25.00
0.00
112,903
714.94
1.10
1.10
0.00
27.50
0.00
103,232
714.61
1.05
1.05
0.00
30.00
0.00
93,953
714.29
1.01
1.01
0.00
32.50
0.00
85,078
713.97
0.96
0.96
0.00
35.00
0.00
76,613
713.66
0.92
0.92
0.00
37.50
0.00
68,569
713.36
0.87
0.87
0.00
40.00
0.00
60,955
713.08
0.82
0.82
0.00
42.50
0.00
53,778
712.80
0.77
0.77
0.00
45.00
0.00
47,050
712.53
0.72
0.72
0.00
47.50
0.00
40,777
712.28
0.67
0.67
0.00
50.00
0.00
34,969
712.04
0.62
0.62
0.00
52.50
0.00
29,635
711.82
0.57
0.57
0.00
55.00
0.00
24,782
711.62
0.51
0.51
0.00
57.50
0.00
20,419
711.43
0.46
0.46
0.00
60.00
0.00
16,551
711.26
0.40
0.40
0.00
62.50
0.00
13,186
711.11
0.35
0.35
0.00
65.00
0.00
10,330
710.98
0.29
0.29
0.00
67.50
0.00
7,989
710.88
0.23
0.23
0.00
70.00
0.00
6,171
710.79
0.17
0.17
0.00
72.50
0.00
4,885
710.73
0.12
0.12
0.00
75.00
0.00
3,986
710.69
0.08
0.08
0.00
77.50
0.00
3,339
710.66
0.06
0.06
0.00
80.00
0.00
2,859
710.64
0.05
0.05
0.00
82.50
0.00
2,492
710.62
0.04
0.04
0.00
85.00
0.00
2,204
710.61
0.03
0.03
0.00
87.50
0.00
1,973
710.60
0.02
0.02
0.00
90.00
0.00
1,783
710.59
0.02
0.02
0.00
92.50
0.00
1,626
710.58
0.02
0.02
0.00
95.00
0.00
1,493
710.57
0.01
0.01
0.00
97.50
0.00
1,379
710.57
0.01
0.01
0.00
100.00
0.00
1,282
710.56
0.01
0.01
0.00
102.50
0.00
1,196
710.56
0.01
0.01
0.00
105.00
0.00
1,121
710.55
0.01
0.01
0.00
107.50
0.00
1,055
710.55
0.01
0.01
0.00
110.00
0.00
996
710.55
0.01
0.01
0.00
112.50
0.00
943
710.55
0.01
0.01
0.00
115.00
0.00
895
710.54
0.01
0.01
0.00
117.50
0.00
852
710.54
0.00
0.00
0.00
120.00
0.00
813
710.54
0.00
0.00
0.00
Type 1124-hr 100yr-24hr Rainfall=7.43"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.50
0.00
0.00
0.00
710.60
0.03
0.03
0.00
710.70
0.09
0.09
0.00
710.80
0.18
0.18
0.00
710.90
0.25
0.25
0.00
711.00
0.30
0.30
0.00
711.10
0.34
0.34
0.00
711.20
0.38
0.38
0.00
711.30
0.42
0.42
0.00
711.40
0.45
0.45
0.00
711.50
0.48
0.48
0.00
711.60
0.51
0.51
0.00
711.70
0.54
0.54
0.00
711.80
0.56
0.56
0.00
711.90
0.59
0.59
0.00
712.00
0.61
0.61
0.00
712.10
0.63
0.63
0.00
712.20
0.65
0.65
0.00
712.30
0.68
0.68
0.00
712.40
0.70
0.70
0.00
712.50
0.72
0.72
0.00
712.60
0.74
0.74
0.00
712.70
0.75
0.75
0.00
712.80
0.77
0.77
0.00
712.90
0.79
0.79
0.00
713.00
0.81
0.81
0.00
713.10
0.83
0.83
0.00
713.20
0.84
0.84
0.00
713.30
0.86
0.86
0.00
713.40
0.88
0.88
0.00
713.50
0.89
0.89
0.00
713.60
0.91
0.91
0.00
713.70
0.92
0.92
0.00
713.80
0.94
0.94
0.00
713.90
0.95
0.95
0.00
714.00
0.97
0.97
0.00
714.10
0.98
0.98
0.00
714.20
1.00
1.00
0.00
714.30
1.01
1.01
0.00
714.40
1.02
1.02
0.00
714.50
1.04
1.04
0.00
714.60
1.05
1.05
0.00
714.70
1.07
1.07
0.00
714.80
1.08
1.08
0.00
714.90
1.09
1.09
0.00
715.00
1.10
1.10
0.00
715.10
2.03
2.03
0.00
715.20
3.71
3.71
0.00
715.30
5.89
5.89
0.00
715.40
8.46
8.46
0.00
715.50
11.38
11.38
0.00
715.60
13.69
13.69
0.00
715.70
15.53
15.53
0.00
715.80
17.13
17.13
0.00
715.90
18.57
18.57
0.00
716.00
19.90
19.90
0.00
716.10
21.14
21.14
0.00
716.20
22.31
22.31
0.00
716.30
23.41
23.41
0.00
716.40
24.46
24.46
0.00
716.50
25.47
25.47
0.00
716.60
26.43
26.43
0.00
716.70
27.36
27.36
0.00
716.80
28.26
28.26
0.00
716.90
29.13
29.13
0.00
717.00
29.97
29.97
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
717.10
30.80
30.80
0.00
717.20
31.59
31.59
0.00
717.30
32.37
32.37
0.00
717.40
33.13
33.13
0.00
717.50
33.87
33.87
0.00
717.60
34.60
34.60
0.00
717.70
35.31
35.31
0.00
717.80
36.00
36.00
0.00
717.90
36.69
36.69
0.00
718.00
37.36
37.36
0.00
718.10
39.67
39.67
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.50
20,568
0
710.60
20,916
2,074
710.70
21,265
4,183
710.80
21,613
6,327
710.90
21,962
8,506
711.00
22,310
10,720
711.10
22,490
12,960
711.20
22,671
15,218
711.30
22,851
17,494
711.40
23,031
19,788
711.50
23,212
22,100
711.60
23,392
24,430
711.70
23,572
26,778
711.80
23,752
29,144
711.90
23,933
31,529
712.00
24,113
33,931
712.10
24,299
36,352
712.20
24,485
38,791
712.30
24,672
41,249
712.40
24,858
43,725
712.50
25,044
46,220
712.60
25,230
48,734
712.70
25,416
51,266
712.80
25,603
53,817
712.90
25,789
56,387
713.00
25,975
58,975
713.10
26,167
61,582
713.20
26,359
64,208
713.30
26,552
66,854
713.40
26,744
69,519
713.50
26,936
72,203
713.60
27,128
74,906
713.70
27,320
77,628
713.80
27,513
80,370
713.90
27,705
83,131
714.00
27,897
85,911
714.10
28,095
88,711
714.20
28,293
91,530
714.30
28,492
94,369
714.40
28,690
97,228
714.50
28,888
100,107
714.60
29,086
103,006
714.70
29,284
105,924
714.80
29,483
108,863
714.90
29,681
111,821
715.00
29,879
114,799
715.10
30,083
117,797
715.20
30,287
120,816
715.30
30,491
123,855
715.40
30,695
126,914
715.50
30,900
129,994
715.60
31,104
133,094
715.70
31,308
136,214
715.80
31,512
139,355
715.90
31,716
142,517
716.00
31,920
145,699
716.10
32,130
148,901
716.20
32,340
152,125
716.30
32,550
155,369
716.40
32,760
158,635
716.50
32,971
161,921
716.60
33,181
165,229
716.70
33,391
168,557
716.80
33,601
171,907
716.90
33,811
175,277
717.00
34.021
178.669
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
717.10
34,237
182,082
717.20
34,453
185,516
717.30
34,670
188,973
717.40
34,886
192,450
717.50
35,102
195,950
717.60
35,318
199,471
717.70
35,534
203,013
717.80
35,751
206,578
717.90
35,967
210,164
718.00
36,183
213,771
718.10
36,405
217,400
718.20
36,627
221,052
718.30
36,849
224,726
718.40
37,071
228,422
718.50
37,294
232,140
718.60
37,516
235,881
718.70
37,738
239,643
718.80
37,960
243,428
718.90
38,182
247,235
719.00
38,404
251,065
719.10
38,632
254,916
719.20
38,860
258,791
719.30
39,089
262,688
719.40
39,317
266,609
719.50
39,545
270,552
719.60
39,773
274,518
719.70
40,001
278,506
719.80
40,230
282,518
719.90
40,458
286,552
720.00
40,686
290,610

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 6.01" for 100yr-24hr event
Inflow = 151.86 cfs @ 11.95 hrs, Volume= 7.645 of
Outflow = 9.61 cfs @ 12.60 hrs, Volume= 7.584 af, Atten= 94%, Lag= 39.0 min
Primary = 9.61 cfs @ 12.60 hrs, Volume= 7.584 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 705.62' @ 12.60 hrs Surf.Area= 60,715 sf Storage= 205,000 cf
Plug -Flow detention time= 1,388.3 min calculated for 7.584 of (99% of inflow)
Center -of -Mass det. time= 1,383.1 min ( 2,163.3 - 780.2 )
Volume
Invert Avail.Storage Storage Description
#1
701.50'
519,480 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.50
22,118
0
0
702.00
43,792
16,478
16,478
703.00
48,320
46,056
62,534
704.00
52,961
50,641
113,174
705.00
57,717
55,339
168,513
706.00
62,582
60,150
228,663
707.00
67,552
65,067
293,730
708.00
72,628
70,090
363,820
709.00
77,809
75,219
439,038
710.00
83,074
80,442
519,480
Device Routing Invert Outlet Devices
#1 Primary 701.39' 24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1 701.50' 4.5" Vert. 4.5" Orifice C= 0.600
#3 Device 1 705.00' 36.0" W x 6.0" H Vert. Slotted Weirs X 2.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=9.61 cfs @ 12.60 hrs HW=705.62' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 9.61 cfs of 26.70 cfs potential flow)
2=4.5" Orifice (Orifice Controls 1.05 cfs @ 9.54 fps)
3=Slotted Weirs (Orifice Controls 8.55 cfs @ 2.85 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.50' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 100yr-24hr Rainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 7
Pond 8P: POND 3
Hydrograph
151.86 CfS
r---r-r--r-
--r-,--r-r--r-
--r----r---r-,--r-r--
■Inflow
-,-
r- --r-
--r-
--r-
--r-
--r-
--r-,--r
--r---r-7--�r/----r-7-C-r---/-�r-----
artfaow Are-a=,'��r260ra
■Outflow
■ Primary
170
r--r-
■Secondary
- -
- Pedk 1=-1ew=7`05- 62
---r�r�--r--I--r-.yr/--�+r-/yr--/yr-ram--
150
140
- -
7--r-7--r-r--r-7--r--1
--
r-r-
- r
-,--r
I-
-r- -r
1
---r-r--rStorage=-2106,-000ic
-
130
- -
--r-
--r-
--r-
-- - --r-r--r----r-r--r-r--r-r--
120
- -
r--r-
--r-
--r-
--r-
--r-r--r- r-- r--li-- r -r - -r---r-r--
110
- -
r--r-r--r-
--r-
--r-
-- - --r---r----r- --r- --r- --
100
w
-,-
-
-r- r--r
-r --r-
--r-r--r-
--r---r----r---r-,--r- --
v 90
- -
--r-
--r-
--r-
--r-
--r- --r---r--li--r- --r- --r- --
0 80
-,-
r--r-r--r-r--r-
-- r
-,--r-r--r---r----r---r-,--r-r--
LL 70r--r-__r-__r-__r-__--r--r-r--r----r-r--r-r--r-r--
60
-,-
r--
r-r--r
-r --r-
--r-,--r-r--r-
--r----r---r-,--r-r--
50
- -
r--r-
--r-
--r-
--r-
--r-r--r---r--li--r- --r---r-r--
40
--r-r--r-r--r-r--r-,--r-r--r-r--r--1--r-
--r-,--r-r--
30
9.61 cfs
20
0.00
Cfs
MWITAR
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM (Wet Ponds)
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.50
0.00
0.00
0.00
2.50
0.00
0
701.50
0.00
0.00
0.00
5.00
0.41
1,231
701.55
0.01
0.01
0.00
7.50
1.14
7,571
701.77
0.15
0.15
0.00
10.00
3.02
22,418
702.13
0.36
0.36
0.00
12.50
11.43
204,715
705.61
9.55
9.55
0.00
15.00
3.37
187,881
705.33
4.68
4.68
0.00
17.50
2.16
179,984
705.20
2.68
2.68
0.00
20.00
1.47
176,011
705.13
1.88
1.88
0.00
22.50
1.31
173,620
705.09
1.48
1.48
0.00
25.00
0.00
168,992
705.01
0.98
0.98
0.00
27.50
0.00
160,367
704.86
0.95
0.95
0.00
30.00
0.00
151,945
704.71
0.92
0.92
0.00
32.50
0.00
143,727
704.56
0.90
0.90
0.00
35.00
0.00
135,715
704.42
0.88
0.88
0.00
37.50
0.00
127,911
704.27
0.86
0.86
0.00
40.00
0.00
120,318
704.13
0.83
0.83
0.00
42.50
0.00
112,939
704.00
0.81
0.81
0.00
45.00
0.00
105,777
703.86
0.78
0.78
0.00
47.50
0.00
98,833
703.73
0.76
0.76
0.00
50.00
0.00
92,111
703.60
0.73
0.73
0.00
52.50
0.00
85,613
703.47
0.71
0.71
0.00
55.00
0.00
79,342
703.34
0.68
0.68
0.00
57.50
0.00
73,300
703.22
0.66
0.66
0.00
60.00
0.00
67,491
703.10
0.63
0.63
0.00
62.50
0.00
61,916
702.99
0.61
0.61
0.00
65.00
0.00
56,578
702.88
0.58
0.58
0.00
67.50
0.00
51,481
702.77
0.55
0.55
0.00
70.00
0.00
46,626
702.67
0.53
0.53
0.00
72.50
0.00
42,015
702.57
0.50
0.50
0.00
75.00
0.00
37,652
702.47
0.47
0.47
0.00
77.50
0.00
33,537
702.38
0.44
0.44
0.00
80.00
0.00
29,675
702.30
0.42
0.42
0.00
82.50
0.00
26,066
702.22
0.39
0.39
0.00
85.00
0.00
22,713
702.14
0.36
0.36
0.00
87.50
0.00
19,618
702.07
0.33
0.33
0.00
90.00
0.00
16,782
702.01
0.30
0.30
0.00
92.50
0.00
14,210
701.95
0.27
0.27
0.00
95.00
0.00
11,913
701.89
0.24
0.24
0.00
97.50
0.00
9,902
701.84
0.21
0.21
0.00
100.00
0.00
8,219
701.79
0.17
0.17
0.00
102.50
0.00
6,872
701.75
0.13
0.13
0.00
105.00
0.00
5,808
701.72
0.10
0.10
0.00
107.50
0.00
4,968
701.69
0.08
0.08
0.00
110.00
0.00
4,300
701.67
0.07
0.07
0.00
112.50
0.00
3,764
701.65
0.05
0.05
0.00
115.00
0.00
3,329
701.63
0.04
0.04
0.00
117.50
0.00
2,972
701.62
0.04
0.04
0.00
120.00
0.00
2,675
701.61
0.03
0.03
0.00
Type 1124-hr 100yr-24hr Rainfall=7.43"
Printed 1/17/2023

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 9
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.50
0.00
0.00
0.00
701.60
0.03
0.03
0.00
701.70
0.09
0.09
0.00
701.80
0.18
0.18
0.00
701.90
0.25
0.25
0.00
702.00
0.30
0.30
0.00
702.10
0.34
0.34
0.00
702.20
0.38
0.38
0.00
702.30
0.42
0.42
0.00
702.40
0.45
0.45
0.00
702.50
0.48
0.48
0.00
702.60
0.51
0.51
0.00
702.70
0.54
0.54
0.00
702.80
0.56
0.56
0.00
702.90
0.59
0.59
0.00
703.00
0.61
0.61
0.00
703.10
0.63
0.63
0.00
703.20
0.65
0.65
0.00
703.30
0.68
0.68
0.00
703.40
0.70
0.70
0.00
703.50
0.72
0.72
0.00
703.60
0.74
0.74
0.00
703.70
0.75
0.75
0.00
703.80
0.77
0.77
0.00
703.90
0.79
0.79
0.00
704.00
0.81
0.81
0.00
704.10
0.83
0.83
0.00
704.20
0.84
0.84
0.00
704.30
0.86
0.86
0.00
704.40
0.88
0.88
0.00
704.50
0.89
0.89
0.00
704.60
0.91
0.91
0.00
704.70
0.92
0.92
0.00
704.80
0.94
0.94
0.00
704.90
0.95
0.95
0.00
705.00
0.97
0.97
0.00
705.10
1.59
1.59
0.00
705.20
2.72
2.72
0.00
705.30
4.18
4.18
0.00
705.40
5.90
5.90
0.00
705.50
7.85
7.85
0.00
705.60
9.39
9.39
0.00
705.70
10.62
10.62
0.00
705.80
11.69
11.69
0.00
705.90
12.66
12.66
0.00
706.00
13.55
13.55
0.00
706.10
14.39
14.39
0.00
706.20
15.17
15.17
0.00
706.30
15.91
15.91
0.00
706.40
16.61
16.61
0.00
706.50
17.29
17.29
0.00
706.60
17.94
17.94
0.00
706.70
18.56
18.56
0.00
706.80
19.17
19.17
0.00
706.90
19.75
19.75
0.00
707.00
20.32
20.32
0.00
707.10
20.87
20.87
0.00
707.20
21.41
21.41
0.00
707.30
21.93
21.93
0.00
707.40
22.44
22.44
0.00
707.50
22.94
22.94
0.00
707.60
23.43
23.43
0.00
707.70
23.90
23.90
0.00
707.80
24.37
24.37
0.00
707.90
24.83
24.83
0.00
708.00
25.28
25.28
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.10
27.38
27.38
0.00
708.20
30.84
30.84
0.00
708.30
35.18
35.18
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM (Wet Ponds) Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 1/17/2023
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.50
22,118
0
701.60
26,453
2,429
701.70
30,788
5,291
701.80
35,122
8,586
701.90
39,457
12,315
702.00
43,792
16,478
702.10
44,245
20,879
702.20
44,698
25,326
702.30
45,150
29,819
702.40
45,603
34,357
702.50
46,056
38,940
702.60
46,509
43,568
702.70
46,962
48,241
702.80
47,414
52,960
702.90
47,867
57,724
703.00
48,320
62,534
703.10
48,784
67,389
703.20
49,248
72,290
703.30
49,712
77,238
703.40
50,176
82,233
703.50
50,641
87,274
703.60
51,105
92,361
703.70
51,569
97,495
703.80
52,033
102,675
703.90
52,497
107,901
704.00
52,961
113,174
704.10
53,437
118,494
704.20
53,912
123,861
704.30
54,388
129,276
704.40
54,863
134,739
704.50
55,339
140,249
704.60
55,815
145,807
704.70
56,290
151,412
704.80
56,766
157,065
704.90
57,241
162,765
705.00
57,717
168,513
705.10
58,204
174,309
705.20
58,690
180,154
705.30
59,176
186,047
705.40
59,663
191,989
705.50
60,150
197,980
705.60
60,636
204,019
705.70
61,123
210,107
705.80
61,609
216,243
705.90
62,095
222,429
706.00
62,582
228,663
706.10
63,079
234,946
706.20
63,576
241,278
706.30
64,073
247,661
706.40
64,570
254,093
706.50
65,067
260,575
706.60
65,564
267,106
706.70
66,061
273,688
706.80
66,558
280,318
706.90
67,055
286,999
707.00
67,552
293,730
707.10
68,060
300,510
707.20
68,567
307,341
707.30
69,075
314,224
707.40
69,582
321,156
707.50
70,090
328,140
707.60
70,598
335,174
707.70
71,105
342,260
707.80
71,613
349,395
707.90
72,120
356,582
708.00
72.628
363.820
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.10
73,146
371,108
708.20
73,664
378,449
708.30
74,182
385,841
708.40
74,700
393,285
708.50
75,219
400,781
708.60
75,737
408,329
708.70
76,255
415,928
708.80
76,773
423,580
708.90
77,291
431,283
709.00
77,809
439,038
709.10
78,336
446,845
709.20
78,862
454,705
709.30
79,388
462,618
709.40
79,915
470,583
709.50
80,442
478,601
709.60
80,968
486,671
709.70
81,495
494,794
709.80
82,021
502,970
709.90
82,547
511,198
710.00
83,074
519,480