SWA000227_Design Calculations_20231031

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TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
610 East Morehead Street, Suite 250
Charlotte, North Carolina 28202
NC License No. C-1652
WAXHAW VOLUNTEER FIRE DEPARTMENT
JOB #: 54647
UNION COUNTY PROJ.#: 20223105
CALCULATIONS FOR:
EROSION CONTROL
STORM DRAINAGE ANALYSIS
STORM DRAINAGE DENTENTION
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DATE: 05/03/23 �.����N • R0� A
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STORM A PROJECT: WAXHAW VOL FD Designed by: AMC
STORM SEWER DESIGN COMPUTATIONS LOCATION: Union County,NC
COUNTY: UNION COUNTY Checked by: WBS
STORM FREQUENCY 10
UNITS ENGLISH
DRAIN. RUNOFF CA TOTAL RAIN RUNOFF INVERT ELEVATIONS LENGTH SLOPE SIZE SHAPE Capacity Friction VEL FLOW
PIPE FROM POINT TO POINT AREA COEFF. INCRE- ADDTL ACCUM- INLET FALL Q UPPER LOWER of Pipe (Dia.Or Slope Vn TIME
NO REFERENCE REFERENCE "A" "C" MENT CA ULATED TIME END END Span/Rise) REMARKS
Acre Minutes In/Hr CFS Ft. Ft./Ft. In. CFS Ft./Ft. Ft/Sec Min.
(1) (2) (3) (4) (5) (6) (7) (8) (9) _ (10) (11) (12) (13) (14) (15) (16) (17) (18) _
A4 A5 A3 0.520 0.800 0.416 0.000 0.416 _ 5.000 7.730 3.216 _ 579.619 578.870 124.908 0.006 15.000 Circular 5.002 0.002 4.339 0.480 _
A2 A3 Al 0.430 0.950 0.409 0.000 0.825 5.480 7.610 6.274 578.276 577.630 107.727 0.006 18.000 Circular 8.135 0.004 5.092 0.353

STORM A PROJECT: WAXHAW VOL FD DESIGNED BY: AMC
HYDRAULIC GRADE LINE ANALYSIS
Checked: WBS
INCIDENCE PROBABILITY 10 Year
OUTLET DIA. DESIGN LENGTH FRICTION FRICTION JUNCTION LOSS Inlet
INLET WATER PIPE DISCH. PIPE SLOPE,Sfo LOSS 1.3 0.5 FINAL Water Rim Comments
OR SURFACE Do Qo Lo Hf Vo Ho Qi Vi QiVi Vi*2/29 Hi Angle HA Ht Ht Ht H Surface Elev
JUNCTION ELEV. (In) (CFS) (Ft) (FT/FT) (Ft) (Ft) (Ft) Elevation
A3 579.63 18 6.27 107.73 0.0036 0.38 5.09 0.10 3.22 4.34 13.95 0.29 0.10 62.38 0.16 0.37 0.47663 FALSE 0.86 580.49 584.61 OK -4.11
A5 580.49 15 3.22 124.91 0.0025 0.31 4.34 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.095 FALSE 0.40 580.90 584.41 OK -3.51

STORM B PROJECT: WAXHAW VOL FD Designed by: AMC
STORM SEWER DESIGN COMPUTATIONS LOCATION: Union County,NC
COUNTY: UNION COUNTY Checked by: WBS
STORM FREQUENCY 10
UNITS ENGLISH
DRAIN. RUNOFF CA TOTAL RAIN RUNOFF INVERT ELEVATIONS LENGTH SLOPE SIZE SHAPE Capacity Friction VEL FLOW
PIPE FROM POINT TO POINT AREA COEFF. INCRE- ADDTL ACCUM- INLET FALL Q UPPER LOWER of Pipe (Dia.Or Slope Vn TIME
NO REFERENCE REFERENCE "A" "C" MENT CA ULATED TIME END END Span/Rise) REMARKS
Acre Minutes In/Hr CFS Ft. Ft./Ft. In. CFS Ft./Ft. Ft/Sec Min.
(1) (2) (3) (4) (5) (6) (7) (8) (9) _ (10) (11) (12) (13) (14) (15) (16) (17) (18) _
BIO B11 B9 0.350 0.740 0.259 0.000 0.259 _ 5.000 7.730 2.002 580.459 579.824 105.770 0.006 15.000 Circular 5.002 0.001 3.858 0.457 _
B8 B9 B7 0.040 0.850 0.034 0.000 0.293 _ 5.457 7.610 2.230 _ 579.620 579.248 62.009 0.006 15.000 Circular 5.002 0.001 3.968 0.260 _
B6 1 B7 B5 0.130 0.850 0.111 0.000 0.404 _ 5.717 7.510 3.030 _ 579.050 578.678 62.029 0.006 15.000 Circular 5.002 0.002 4.280 0.242
B12 B12 B13 0.090 0.950 0.086 0.000 0.086 _ 5.000 7.730 0.661 _ 580.320 579.240 55.260 0.020 8.000 Circular 1.829 0.003 4.828 0.191
B14 B13 B5 0.000 0.000 0.000 0.000 0.086 _ 5.191 7.700 0.658 _ 578.500 578.250 39.637 0.006 8.000 Circular 1.039 0.003 3.159 0.209
B4 B5 B3 0.090 0.950 0.086 0.000 0.575 _ 5.959 7.450 4.280 _ 578.050 577.587 77.115 0.006 18.000 Circular 8.135 0.002 4.672 0.275
B2 B3 B1 0.000 0.000 0.000 0.000 0.575 6.234 7.360 4.228 577.400 577.235 33.000 0.005 18.000 Circular 7.426 0.002 4.348 0.127

STORM B PROJECT: WAXHAW VOL FD DESIGNED BY: AMC
HYDRAULIC GRADE LINE ANALYSIS
Checked: WBS
INCIDENCE PROBABILITY 10 Year
OUTLET DIA. DESIGN LENGTH FRICTION FRICTION JUNCTION LOSS Inlet
INLET WATER PIPE DISCH. PIPE SLOPE,Sfo LOSS 1.3 0.5 FINAL Water Rim Comments
OR SURFACE Do Qo Lo Hf Vo Ho Qi Vi QiVi Vi*2/29 Hi Angle HA Ht Ht Ht H Surface Elev
JUNCTION ELEV. (In) (CFS) (Ft) (FT/FT) (Ft) (Ft) (Ft) Elevation
B3 579.63 18 4.23 33.00 0.0016 0.05 4.35 0.07 4.28 4.67 20.00 0.34 0.12 57.33 0.19 0.38 0 FALSE 0.44 580.07 584.14 OK -4.08
B5 578.79 18 4.28 77.11 0.0017 0.13 4.67 0.08 3.03 4.28 12.97 0.28 0.10 52.65 0.14 0.33 0 FALSE 0.45 579.24 582.41 OK -3.16
B7 579.68 15 3.03 62.03 0.0022 0.14 4.28 0.07 2.23 3.97 8.85 0.24 0.09 10.58 0.03 0.19 0.245 FALSE 0.38 580.06 583.24 OK -3.18
B9 580.25 15 2.23 62.01 0.0012 0.07 3.97 0.06 2.00 3.86 7.72 0.23 0.08 60.52 0.13 0.27 0 FALSE 0.35 580.59 584.21 OK -3.62
B11 580.82 15 2.00 105.77 0.0010 0.10 3.86 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.07512 FALSE 0.18 581.00 583.88 OK -2.88
B13 579.24 8 0.66 39.64 0.0025 0.10 3.16 0.04 0.66 4.83 3.19 0.36 0.13 84.26 0.24 0.40 0 FALSE 0.50 579.75 580.63 OK -0.89
B12 579.77 8 0.66 55.26 0.0025 0.14 4.83 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.11764 FALSE 0.26 580.03 581.53 OK -1.5

<12S>
<13S>
Predevelopment - Postdevelopment -
Project Area Project Area
Subcat Reach Pon Link Routing Diagram for 54647-Drainage Pre-Post
Prepared by Timmons Group, Printed 10/26/2023
HydroCAD®10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC

54647 - Drainage_Pre-Post
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 2
Rainfall Events Listing (selected events)
Event# Event Storm Type Curve Mode Duration B/B Depth AMC
Name (hours) (inches)
1 1-Year Type II 24-hr Default 24.00 1 2.87 2

54647 - Drainage_Pre-Post
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 3
Area Listing (selected nodes)
Area CN Description
(acres) (subcatchment-numbers)
0.940 61 >75% Grass cover, Good, HSG B (13S)
0.130 74 >75% Grass cover, Good, HSG C (13S)
0.540 80 >75% Grass cover, Good, HSG D (13S)
0.050 56 Brush, Fair, HSG B (12S)
0.080 70 Brush, Fair, HSG C (12S)
0.340 77 Brush, Fair, HSG D (12S)
1.010 98 Paved parking, HSG B (13S)
0.160 98 Paved parking, HSG C (13S)
4.400 60 Woods, Fair, HSG B (12S, 13S)
0.450 73 Woods, Fair, HSG C (12S, 13S)
0.200 79 Woods, Fair, HSG D (12S)
8.300 69 TOTAL AREA

54647 - Drainage_Pre-Post
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 4
Soil Listing (selected nodes)
Area Soil Subcatchment
(acres) Group Numbers
0.000 HSG A
6.400 HSG B 12S, 13S
0.820 HSG C 12S, 13S
1.080 HSG D 12S, 13S
0.000 Other
8.300 TOTAL AREA

54647 - Drainage_Pre-Post
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 5
Ground Covers (selected nodes)
HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment
(acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers
0.000 0.940 0.130 0.540 0.000 1.610 >75% Grass cover, Good 13S
0.000 0.050 0.080 0.340 0.000 0.470 Brush, Fair 12S
0.000 1.010 0.160 0.000 0.000 1.170 Paved parking 13S
0.000 4.400 0.450 0.200 0.000 5.050 Woods, Fair 12S,
13S
0.000 6.400 0.820 1.080 0.000 8.300 TOTAL AREA

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 6
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment12S: Predevelopment- Runoff Area=4.150 ac 0.00% Impervious Runoff Depth=0.38"
Flow Length=624' Tc=27.8 min CN=63 Runoff=0.88 cfs 0.131 af
Subcatchment13S: Postdevelopment- Runoff Area=4.150 ac 28.19% Impervious Runoff Depth=0.83"
Tc=5.0 min CN=74 Runoff=6.02 cfs 0.286 af
Total Runoff Area = 8.300 ac Runoff Volume = 0.417 af Average Runoff Depth = 0.60"
85.90% Pervious = 7.130 ac 14.10% Impervious = 1.170 ac

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 12S: Predevelopment - Project Area
Runoff = 0.88 cfs @ 12.30 hrs, Volume= 0.131 af, Depth= 0.38"
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-Year Rainfall=2.87"
Area (ac) CN Description
3.160 60 Woods, Fair, HSG B
0.320 73 Woods, Fair, HSG C
0.200 79 Woods, Fair, HSG D
0.050 56 Brush, Fair, HSG B
0.080 70 Brush, Fair, HSG C
0.340 77 Brush, Fair, HSG D
4.150 63 Weighted Average
4.150 100.00°/o Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.9 254 0.0477 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
10.0 270 0.0391 0.45 1.34 Channel Flow, CHANNEL
Area= 3.0 sf Perim= 6.3' r= 0.48'
n= 0.400 Sheet flow: Woods+light brush
27.8 624 Total

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 8
Subcatchment 12S: Predevelopment - Project Area
Hydrograph
/111 1 II 11 1 1 I I 1 I I 1 1 I 1 1
0.94/ 1 11 1 11 I I 1 I II I II I II I II ■Runoff
0.9 ...„ I0.88�I I 1 1 11 11 1 1 1 1 1 1 1 1 1 1 1
0.85 1 I I 1 I T pe II124 hP
0.8 1 - arirn#a11=3. 7�'-
0.75=
ii
0.7 1 1 _ 1 1 1 1 1 1 Rth- ff ea=4.115O-a-
0.64, 1 1 1 1 1 11 11 1 1 1 1 1 1 1 1 1 1 1
0.6 _ I _ 1 1 1 11 1 1 Runoff VV llnle=4).131- of
w 0.54' 1 ' / 1 1 1 1 1 1 1 �pI . �� f ,
05� 1 / 1 1 1 1 1 1 1 1 1 'I Ullit4 " �7wIuc'"1
i? 0.45� % �2I Length 624'-
0.4 ' Z 1_ _1 _ L L 1 1 L 1 L 1 1 1 1 1 1 I�Q L [ _
0.35� I ITQ=27�KL min-
0.34/ 1 1 1 1 1 1 11 1 II 1 1 nLc
5�0.2 ) L 1 L L- ØL _1— L _ 1_ —1— _I — 1— L —I— L —1 — L A _ 1— Y'`L6j
0.2 J_ _ 1 L L 1 1 1 L A 1 L I L I I_ A 1 L I L L
0.15, ,L _ %��' L — 1_ 1 —I— L _I — 1_ L —I— L —1 — I I _ 1_ L _I _ L L
0.1� J_ _ L L _ 1_ 1 1_ L A 1_ L _1 L _1 _ _ _ 1_ _1 _
0.00_� i1i1i���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)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 9
Hydrograph for Subcatchment 12S: Predevelopment - Project Area
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.08 0.00 0.00
5.00 0.18 0.00 0.00
7.50 0.31 0.00 0.00
10.00 0.52 0.00 0.00
12.50 2.11 0.13 0.64
15.00 2.45 0.23 0.13
17.50 2.62 0.28 0.09
20.00 2.73 0.33 0.06
22.50 2.82 0.36 0.06
25.00 2.87 0.38 0.00
27.50 2.87 0.38 0.00
30.00 2.87 0.38 0.00
32.50 2.87 0.38 0.00
35.00 2.87 0.38 0.00
37.50 2.87 0.38 0.00
40.00 2.87 0.38 0.00
42.50 2.87 0.38 0.00
45.00 2.87 0.38 0.00
47.50 2.87 0.38 0.00
50.00 2.87 0.38 0.00
52.50 2.87 0.38 0.00
55.00 2.87 0.38 0.00
57.50 2.87 0.38 0.00
60.00 2.87 0.38 0.00
62.50 2.87 0.38 0.00
65.00 2.87 0.38 0.00
67.50 2.87 0.38 0.00
70.00 2.87 0.38 0.00
72.50 2.87 0.38 0.00
75.00 2.87 0.38 0.00
77.50 2.87 0.38 0.00
80.00 2.87 0.38 0.00
82.50 2.87 0.38 0.00
85.00 2.87 0.38 0.00
87.50 2.87 0.38 0.00
90.00 2.87 0.38 0.00
92.50 2.87 0.38 0.00
95.00 2.87 0.38 0.00
97.50 2.87 0.38 0.00
100.00 2.87 0.38 0.00
102.50 2.87 0.38 0.00
105.00 2.87 0.38 0.00
107.50 2.87 0.38 0.00
110.00 2.87 0.38 0.00
112.50 2.87 0.38 0.00
115.00 2.87 0.38 0.00
117.50 2.87 0.38 0.00
120.00 2.87 0.38 0.00

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 10
Summary for Subcatchment 13S: Postdevelopment - Project Area
Runoff = 6.02 cfs @ 11.97 hrs, Volume= 0.286 af, Depth= 0.83"
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-Year Rainfall=2.87"
Area (ac) CN Description
1.240 60 Woods, Fair, HSG B
0.130 73 Woods, Fair, HSG C
0.940 61 >75% Grass cover, Good, HSG B
0.130 74 >75% Grass cover, Good, HSG C
0.540 80 >75% Grass cover, Good, HSG D
1.010 98 Paved parking, HSG B
0.160 98 Paved parking, HSG C
4.150 74 Weighted Average
2.980 71.81% Pervious Area
1.170 28.19% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, DIRECT
Subcatchment 13S: Postdevelopment - Project Area
Hydrograph
I I I ' I I I I I
- I I I I I I I I I ■Runoff
•I , —I — I— —h — I— t —I — t —I 1 —1 — I— � —I— -
6� I I " I I I I I 1 1 Type I1124-hr
- - - 7 - ; T -I - r - - 1-1-7learrRainfal 4*771'- -
5�
i 1 1 1 1 1 'Runoff Area=4.150 at
1 1 1 1 1 1 1 1 1 1 1
4-' I I I 1 RunofflVolume=0:286 of -
N tu;nOff 11DppthT0.031
0 3� 11 / 1 1 1 I 1 1 I 1 1 I 1 Tc5.'0 mill
—
I I I I I I I I I I I I I I I I I I �+I I I
' ' 1 1 1 1 1 1 IIIIIII CN74
2-' 1 1 1 1 1 1 1 I I I I I I I I I I
1 / 1 I I I I I
1 I 1 1
1- 1 1 1 ' 1 1
ci dill/ lilliil//l//iiiiiiiii�iii�iiiiiiiiiii///�/�/����/liiiiiiiiiiiiiiiii/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)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 11
Hydrograph for Subcatchment 13S: Postdevelopment - Project Area
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.08 0.00 0.00
5.00 0.18 0.00 0.00
7.50 0.31 0.00 0.00
10.00 0.52 0.00 0.00
12.50 2.11 0.40 0.61
15.00 2.45 0.58 0.20
17.50 2.62 0.67 0.14
20.00 2.73 0.74 0.09
22.50 2.82 0.80 0.09
25.00 2.87 0.83 0.00
27.50 2.87 0.83 0.00
30.00 2.87 0.83 0.00
32.50 2.87 0.83 0.00
35.00 2.87 0.83 0.00
37.50 2.87 0.83 0.00
40.00 2.87 0.83 0.00
42.50 2.87 0.83 0.00
45.00 2.87 0.83 0.00
47.50 2.87 0.83 0.00
50.00 2.87 0.83 0.00
52.50 2.87 0.83 0.00
55.00 2.87 0.83 0.00
57.50 2.87 0.83 0.00
60.00 2.87 0.83 0.00
62.50 2.87 0.83 0.00
65.00 2.87 0.83 0.00
67.50 2.87 0.83 0.00
70.00 2.87 0.83 0.00
72.50 2.87 0.83 0.00
75.00 2.87 0.83 0.00
77.50 2.87 0.83 0.00
80.00 2.87 0.83 0.00
82.50 2.87 0.83 0.00
85.00 2.87 0.83 0.00
87.50 2.87 0.83 0.00
90.00 2.87 0.83 0.00
92.50 2.87 0.83 0.00
95.00 2.87 0.83 0.00
97.50 2.87 0.83 0.00
100.00 2.87 0.83 0.00
102.50 2.87 0.83 0.00
105.00 2.87 0.83 0.00
107.50 2.87 0.83 0.00
110.00 2.87 0.83 0.00
112.50 2.87 0.83 0.00
115.00 2.87 0.83 0.00
117.50 2.87 0.83 0.00
120.00 2.87 0.83 0.00

SAND FILTER
WAXHAW VOLUNTEER FIRE •'����•
• •
DEPARTMENT
TIMMONS JOB NO.: 54647.000 TIMMONS GROUP
DATE: 5/3/2023 BY: AMC o THROUGH
REVISED: 10/26/2023 RVW: WBS
SAND FILTER BMP SUMMARY CHART
Post-Routing
Peak Control Storm Event Pre-dev Runoff Post-dev Runoff Runoff Elevation
Top of Dam 583.00
100-yr-24hr 13.75 cfs 14.98 cfs 5.36 cfs 580.97
50-yr-24 hr 11.26 cfs 11.19 cfs 3.19 cfs 580.59
25-yr-24 hr 8.98 cfs 8.84 cfs 2.35 cfs 580.18
10-yr-24hr 6.26 cfs 6.12 cfs 1.47 cfs 579.63
2-yr-24hr 2.36 cfs 2.16 cfs 0.22 cfs 578.89
1-yr-24hr 1.22 cfs 1.22 cfs 0.15 cfs 578.45
DV= 6,752 cu-ft
Maximum Ponding Depth= 6 ft
Minimum Sand Filter Surface Area= 844 sf
Provided Sand Filter Surface Area= 850 sf
Sand Chamber Surface Area= 850 sf
Water Quality Volume Sizing
Sand Filter Basin Storage-Elevation Data
Total Accum.
Elevation Sedimentation Chamber Filtration Basin Vol.(cu ft) Notes
Inc.Vol. Inc.Vol.
Area(sf) Area(ac) (cu ft) Area(sf) Area(ac) (ac-ft)
575.50 0 0.000 0 850 0.020 0.000 0.00
576.50 0 0.000 0 850 0.020 850 850
577.00 0 0.000 0 850 0.020 425 1275
577.00 3579 0.082 0 0 0.000 0 1275
578.00 4438 0.102 4009 0 0.000 0 5284
579.00 5335 0.122 4887 0 0.000 0 10170
580.00 6289 0.144 5812 0 0.000 0 15982
581.00 7299 0.168 6794 0 0.000 0 22776
582.00 8366 0.192 7833 0 0.000 0 29759
Design Top of Sand Filter' 577.00
DV(Adj)= 6,752 cu-ft
Elevation to hold DV(Adj)= 578.21

Water Draw Through Rate:
Darcy's Equation:
Q=(2.32*10^-5)*K*A*(H/L) Q= 0.0394 cfs
Where:
Q=Flow(Rate of Draw)through Bioretentioin Soil(cfs)
K=Hydraulic Conductivity of soil(in./hr.)(2"/Hour)
A=Surface Area of Sand Chamber Area(SF)
H=Height of Water above Drainage Pipe(Underdrain)
L=Thickness of Sand(1)
Assume(H/L)—1
Source:(NCSU Rain Garden Design Worksheet,Bill Hunt)
1)Calculate Time to Drawdown water from Inundation to Saturation at Surface:
Volume/Q: 79868 Seconds
22.2 Hours to Saturation
2)Calculate Time to lower Water Table to permanent pool surface:
Assume 45%Porosity
Volume=Area x PP Elev x 0.45
= 1417.5 Cubic Feet
= 35941 Seconds
= 10.0 Hours Ito Lower Water to Permanent Pool Elevation
3)Calculate Time to Drawdown Total:
Ts-s+Ts-2 32.2 Hours
�IZE UNDERDRAIN
Pipe Size:
D=16*{((Q*10)*n)/s^0.5}^(3/8)
N=number of pipes Mannings Roughness Coefficients
D=diameter of single pipe to carry flow(in) _ Pipe Type&Diameter n
Q=Flow(cfs)*10 for factor of safety 4"Single Wall Corrugated Plastic 0.014-0.015
n=manning coefficient(see Table) 4"Smooth Wall Plastic 0.010-0.011
s=slope of pipe(typically assumed to be min.0.5%) 6"Single Wall Corrugated Plastic 0.014-0.015
(Bill Hunt Rain Garden Design Worksheet) 6"Smooth Wall Plastic 0.010-0.011
n= 0.010 8"Single Wall Corrugated Plastic 0.015-0.016
s= 0.005 (in decimal form)
D= 5.4 Inches
N= 2 pipes
Pipe size= 6 in. diameter
Recommended:Use atleast 2 pipes incase clogging occurs
Source: (NCSU Rain Garden Design Worksheet,Bill Hunt)
Number of pipes is based on MDC A-5 Tables 1 and 2 for Underdrains

(4S) (es)
® ® Postdevelopme t Point (BS)
���Predevelopment oint 1 Predevelolpment Point 2 1 BYPAS 1 Postdevelo2ment Point lll
�� A
6L ---------------1)'�� POND
1111
PRE DEV
POST DEV
(subcat Reach 'on• lit Routing Diagram for 54647-Drainage Pre-Post
Prepared by Timmons Group, Printed 10/26/2023
0 HydroCAD®10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC

54647 - Drainage_Pre-Post Table of Contents
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC
TABLE OF CONTENTS
Project Reports
1 Routing Diagram
2 Project Notes
3 Rainfall Events Listing (selected events)
4 Area Listing (selected nodes)
5 Soil Listing (selected nodes)
6 Ground Covers (selected nodes)
7 Pipe Listing (selected nodes)
1-Year Event
8 Node Listing
9 Subcat 3S: Predevelopment Point 1
12 Subcat 4S: Postdevelopment Point 1
14 Subcat 7S: Predevelolpment Point 2
16 Subcat 8S: BYPASS 1
19 Subcat 9S: Postdevelopment Point 2
21 Pond 12P: POND
27 Link 6L: PRE DEV
29 Link 11 L: POST DEV
2-Year Event
31 Node Listing
32 Subcat 3S: Predevelopment Point 1
35 Subcat 4S: Postdevelopment Point 1
37 Subcat 7S: Predevelolpment Point 2
39 Subcat 8S: BYPASS 1
42 Subcat 9S: Postdevelopment Point 2
44 Pond 12P: POND
50 Link 6L: PRE DEV
52 Link 11 L: POST DEV
10-Year Event
54 Node Listing
55 Subcat 3S: Predevelopment Point 1
58 Subcat 4S: Postdevelopment Point 1
60 Subcat 7S: Predevelolpment Point 2
62 Subcat 8S: BYPASS 1
65 Subcat 9S: Postdevelopment Point 2
67 Pond 12P: POND
73 Link 6L: PRE DEV
75 Link 11 L: POST DEV
25-Year Event
77 Node Listing
78 Subcat 3S: Predevelopment Point 1
81 Subcat 4S: Postdevelopment Point 1

54647 - Drainage_Pre-Post Table of Contents
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC
83 Subcat 7S: Predevelolpment Point 2
85 Subcat 8S: BYPASS 1
88 Subcat 9S: Postdevelopment Point 2
90 Pond 12P: POND
96 Link 6L: PRE DEV
98 Link 11 L: POST DEV
50-Year Event
100 Node Listing
101 Subcat 3S: Predevelopment Point 1
104 Subcat 4S: Postdevelopment Point 1
106 Subcat 7S: Predevelolpment Point 2
108 Subcat 8S: BYPASS 1
111 Subcat 9S: Postdevelopment Point 2
113 Pond 12P: POND
119 Link 6L: PRE DEV
121 Link 11 L: POST DEV
100-Year Event
123 Node Listing
124 Subcat 3S: Predevelopment Point 1
127 Subcat 4S: Postdevelopment Point 1
129 Subcat 7S: Predevelolpment Point 2
131 Subcat 8S: BYPASS 1
134 Subcat 9S: Postdevelopment Point 2
136 Pond 12P: POND
142 Link 6L: PRE DEV
144 Link 11 L: POST DEV

54647 - Drainage_Pre-Post
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 3
Rainfall Events Listing (selected events)
Event# Event Storm Type Curve Mode Duration B/B Depth AMC
Name (hours) (inches)
1 1-Year Type II 24-hr Default 24.00 1 2.87 2
2 2-Year Type II 24-hr Default 24.00 1 3.47 2
3 10-Year Type II 24-hr Default 24.00 1 5.05 2
4 25-Year Type II 24-hr Default 24.00 1 6.00 2
5 50-Year Type II 24-hr Default 24.00 1 6.75 2
6 100-Year Type II 24-hr Default 24.00 1 7.53 2

54647 - Drainage_Pre-Post
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 4
Area Listing (selected nodes)
Area CN Description
(acres) (subcatchment-numbers)
1.020 61 >75% Grass cover, Good, HSG B (4S, 8S)
0.130 74 >75% Grass cover, Good, HSG C (4S, 8S)
0.550 80 >75% Grass cover, Good, HSG D (4S, 8S)
0.120 56 Brush, Fair, HSG B (3S)
0.080 70 Brush, Fair, HSG C (3S)
0.350 77 Brush, Fair, HSG D (3S)
1.180 98 Paved parking, HSG B (3S, 4S, 8S)
0.280 98 Paved parking, HSG C (3S, 4S, 8S)
0.080 98 Paved parking, HSG D (3S, 8S)
6.470 60 Woods, Fair, HSG B (3S, 4S, 7S, 8S, 9S)
0.450 73 Woods, Fair, HSG C (3S, 8S)
0.200 79 Woods, Fair, HSG D (3S)
10.910 68 TOTAL AREA

54647 - Drainage_Pre-Post
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 5
Soil Listing (selected nodes)
Area Soil Subcatchment
(acres) Group Numbers
0.000 HSG A
8.790 HSG B 3S, 4S, 7S, 8S, 9S
0.940 HSG C 3S, 4S, 8S
1.180 HSG D 3S, 4S, 8S
0.000 Other
10.910 TOTAL AREA

54647 - Drainage_Pre-Post
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 6
Ground Covers (selected nodes)
HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment
(acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers
0.000 1.020 0.130 0.550 0.000 1.700 >75% Grass cover, Good 4S, 8S
0.000 0.120 0.080 0.350 0.000 0.550 Brush, Fair 3S
0.000 1.180 0.280 0.080 0.000 1.540 Paved parking 3S, 4S,
8S
0.000 6.470 0.450 0.200 0.000 7.120 Woods, Fair 3S, 4S,
7S, 8S,
9S
0.000 8.790 0.940 1.180 0.000 10.910 TOTAL AREA

54647 - Drainage_Pre-Post
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 7
Pipe Listing (selected nodes)
Line# Node In-Invert Out-Invert Length Slope n Width Diam/Height Inside-Fill
Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches)
1 12P 575.50 573.63 57.4 0.0326 0.013 0.0 15.0 0.0

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 8
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment3S: PredevelopmentPoint 1 Runoff Area=4.340 ac 4.61% Impervious Runoff Depth=0.45"
Flow Length=624' Tc=27.8 min CN=65 Runoff=1.22 cfs 0.162 af
Subcatchment4S: PostdevelopmentPoint Runoff Area=2.340 ac 48.29% Impervious Runoff Depth=1.21"
Tc=5.0 min CN=81 Runoff=5.12 cfs 0.237 af
Subcatchment7S: PredevelolpmentPoint 2 Runoff Area=1.110 ac 0.00% Impervious Runoff Depth=0.29"
Flow Length=114' Tc=32.3 min CN=60 Runoff=0.13 cfs 0.027 af
Subcatchment8S: BYPASS 1 Runoff Area=2.120 ac 9.91% Impervious Runoff Depth=0.56"
Flow Length=627' Tc=17.8 min CN=68 Runoff=1.14 cfs 0.099 af
Subcatchment9S: PostdevelopmentPoint 2 Runoff Area=1.000 ac 0.00% Impervious Runoff Depth=0.29"
Flow Length=93' Slope=0.0106 '/' Tc=28.5 min CN=60 Runoff=0.13 cfs 0.024 af
Pond 12P: POND Peak Elev=578.45' Storage=6,097 cf Inflow=5.12 cfs 0.237 af
Primary=0.15 cfs 0.237 af Secondary=0.00 cfs 0.000 af Outflow=0.15 cfs 0.237 af
Link 6L: PRE DEV Inflow=1.22 cfs 0.162 af
Primary=1.22 cfs 0.162 af
Link 11 L: POST DEV Inflow=1.22 cfs 0.336 af
Primary=1.22 cfs 0.336 af
Total Runoff Area = 10.910 ac Runoff Volume = 0.548 af Average Runoff Depth = 0.60"
85.88% Pervious = 9.370 ac 14.12% Impervious = 1.540 ac

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 9
Summary for Subcatchment 3S: Predevelopment Point 1
Runoff = 1.22 cfs @ 12.28 hrs, Volume= 0.162 af, Depth= 0.45"
Routed to Link 6L : PRE DEV
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-Year Rainfall=2.87"
Area (ac) CN Description
3.070 60 Woods, Fair, HSG B
0.320 73 Woods, Fair, HSG C
0.200 79 Woods, Fair, HSG D
0.120 56 Brush, Fair, HSG B
0.080 70 Brush, Fair, HSG C
0.350 77 Brush, Fair, HSG D
0.100 98 Paved parking, HSG B
0.060 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
4.340 65 Weighted Average
4.140 95.39% Pervious Area
0.200 4.61% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs) _
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.9 254 0.0477 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
10.0 270 0.0391 0.45 1.34 Channel Flow, CHANNEL
Area= 3.0 sf Perim= 6.3' r= 0.48'
n= 0.400 Sheet flow: Woods+light brush
27.8 624 Total

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 10
Subcatchment 3S: Predevelopment Point 1
Hydrograph
I I I I I I I I I I
I I I I I I I I I I I I I I ❑Runoff
11.22 cfs I ' I I 1 I I 1 I I 1 I 1 I 1 1
11 I I 1 I I 1 I 1Type 11124-hr
11 ' - I— _, - + -11 - 1- -� - 117 r_Rlainfalhz.076'
1 / ' ' 'Runbff Awea=4.340 at
1 I I 1 1 I 1 1 I I 1 1
/ 1 Runoff Volume=0.162 of
1 1nn
u'n 'ff'De th 0.1Q56'
1 Q p — h 1
LL I FIOw'mi 1Length=624'
I I 1 1 I ITc=27.18 min
mil 1 1
1 1 1 1 1 1 l�l 6
1 1 1 1 1 1 1 1 1 1
III 1 1 ' 1 1
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)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 11
Hydrograph for Subcatchment 3S: Predevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.08 0.00 0.00
5.00 0.18 0.00 0.00
7.50 0.31 0.00 0.00
10.00 0.52 0.00 0.00
12.50 2.11 0.17 0.83
15.00 2.45 0.28 0.15
17.50 2.62 0.34 0.10
20.00 2.73 0.39 0.07
22.50 2.82 0.43 0.06
25.00 2.87 0.45 0.00
27.50 2.87 0.45 0.00
30.00 2.87 0.45 0.00
32.50 2.87 0.45 0.00
35.00 2.87 0.45 0.00
37.50 2.87 0.45 0.00
40.00 2.87 0.45 0.00
42.50 2.87 0.45 0.00
45.00 2.87 0.45 0.00
47.50 2.87 0.45 0.00
50.00 2.87 0.45 0.00
52.50 2.87 0.45 0.00
55.00 2.87 0.45 0.00
57.50 2.87 0.45 0.00
60.00 2.87 0.45 0.00
62.50 2.87 0.45 0.00
65.00 2.87 0.45 0.00
67.50 2.87 0.45 0.00
70.00 2.87 0.45 0.00
72.50 2.87 0.45 0.00
75.00 2.87 0.45 0.00
77.50 2.87 0.45 0.00
80.00 2.87 0.45 0.00
82.50 2.87 0.45 0.00
85.00 2.87 0.45 0.00
87.50 2.87 0.45 0.00
90.00 2.87 0.45 0.00
92.50 2.87 0.45 0.00
95.00 2.87 0.45 0.00
97.50 2.87 0.45 0.00
100.00 2.87 0.45 0.00
102.50 2.87 0.45 0.00
105.00 2.87 0.45 0.00
107.50 2.87 0.45 0.00
110.00 2.87 0.45 0.00
112.50 2.87 0.45 0.00
115.00 2.87 0.45 0.00
117.50 2.87 0.45 0.00
120.00 2.87 0.45 0.00

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 12
Summary for Subcatchment 4S: Postdevelopment Point 1
[49] Hint: Tc<2dt may require smaller dt
Runoff = 5.12 cfs @ 11.96 hrs, Volume= 0.237 af, Depth= 1.21"
Routed to Pond 12P : POND
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-Year Rainfall=2.87"
Area (ac) CN Description
0.850 61 >75% Grass cover, Good, HSG B
0.010 74 >75% Grass cover, Good, HSG C
0.240 80 >75% Grass cover, Good, HSG D
1.000 98 Paved parking, HSG B
0.130 98 Paved parking, HSG C
0.110 60 Woods, Fair, HSG B
2.340 81 Weighted Average
1.210 51.71% Pervious Area
1.130 48.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, DIRECT
Subcatchment 4S: Postdevelopment Point 1
Hydrograph
I I I I I I i I I
- I I I I I I I I I I I ■Runoff
_ J_ ® I 1 _I_ L I 1 _ 1 _ILJILI_ _
5- I I I I I I 1 I I I I I I1 pe I11 24-h r
1 1 1 1 ; 1�Yoarl Rainfall-2 1nfall-2.07�'
4� 1 11 I I 1 1 1Runbff Area=2.340 ad
- I I I I I I 1 I I 1 1 I 1 1
11 11 1 Runoff Volume=0.237 af
3� I I 11 1 I tu;ngff1Depth 1 117
o _ 1 / 1 1 1 1 1 1 1 1 Tc 5.10 Mill
" 1 1 1 1 1 1 1 1 1 I I I I I
2� 1 1 1 I 1 1 I 1 1 1 1 1 #8I-
- 1 1 I I I I I I I
1-/ 1 1
1 1 1 1
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)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 13
Hydrograph for Subcatchment 4S: Postdevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.08 0.00 0.00
5.00 0.18 0.00 0.00
7.50 0.31 0.00 0.00
10.00 0.52 0.00 0.01
12.50 2.11 0.68 0.46
15.00 2.45 0.91 0.15
17.50 2.62 1.03 0.10
20.00 2.73 1.11 0.07
22.50 2.82 1.18 0.06
25.00 2.87 1.21 0.00
27.50 2.87 1.21 0.00
30.00 2.87 1.21 0.00
32.50 2.87 1.21 0.00
35.00 2.87 1.21 0.00
37.50 2.87 1.21 0.00
40.00 2.87 1.21 0.00
42.50 2.87 1.21 0.00
45.00 2.87 1.21 0.00
47.50 2.87 1.21 0.00
50.00 2.87 1.21 0.00
52.50 2.87 1.21 0.00
55.00 2.87 1.21 0.00
57.50 2.87 1.21 0.00
60.00 2.87 1.21 0.00
62.50 2.87 1.21 0.00
65.00 2.87 1.21 0.00
67.50 2.87 1.21 0.00
70.00 2.87 1.21 0.00
72.50 2.87 1.21 0.00
75.00 2.87 1.21 0.00
77.50 2.87 1.21 0.00
80.00 2.87 1.21 0.00
82.50 2.87 1.21 0.00
85.00 2.87 1.21 0.00
87.50 2.87 1.21 0.00
90.00 2.87 1.21 0.00
92.50 2.87 1.21 0.00
95.00 2.87 1.21 0.00
97.50 2.87 1.21 0.00
100.00 2.87 1.21 0.00
102.50 2.87 1.21 0.00
105.00 2.87 1.21 0.00
107.50 2.87 1.21 0.00
110.00 2.87 1.21 0.00
112.50 2.87 1.21 0.00
115.00 2.87 1.21 0.00
117.50 2.87 1.21 0.00
120.00 2.87 1.21 0.00

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 14
Summary for Subcatchment 7S: Predevelolpment Point 2
Runoff = 0.13 cfs @ 12.40 hrs, Volume= 0.027 af, Depth= 0.29"
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-Year Rainfall=2.87"
Area (ac) CN Description
1.110 60 Woods, Fair, HSG B
1.110 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 100 0.0093 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
0.4 14 0.0121 0.55 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
32.3 114 Total
Subcatchment 7S: Predevelolpment Point 2
Hydrograph
/1 I I I I I I II
0.14� I 1 1 1 I ❑Runoff
'r- II 0.13 cfs I 7 I I i I i I -r 1 1
0.13� 1_ J —/ L —I — LL — I- 1 I— LJ I— L —I L —I — I JT7'pe- 1-1124-hr
0.12 �� 11 �4- far n#a1 i1=2.07'
0.11
0.1� 1- H / - I HH - 1— 1 1— H -1 1— H —Ran-offA1-ea=1.1'fiOaac-
1_ J —/ L —I — HL — I- 1 I— HJ 1— H —I L —I — J — I— L —I — LL
0.09 11 / 1 1 1 1 1 1 1 Runoff 1Volume=10.027 af
0.08 I / 1 I 1 1u1___I� In �TI��_1=1 0. ,.
fi — r — I— rt — — fi — I— rt -1- III T-w� ,�I
30 0.07= ,I— 4 J — I— 1 —1— J — — 4 —I— L Fb'W L-enOtf1— 1�14'-
u` 0.06
0.05 I 1 I I 1 1 1 I 1 I I 1 I I�Q=32.3-min
1— H -r -I - H 1 - I— -1 1— fi -I 1- H -I t -1 - I rt - 1- t (e('i,kAi'is
0.04_ , 1_ -I - L J - I- 1 -1- L J - L L -I- L -1 - I- J - 1- L _ Nr6
o.oa� i %' 11 I 1 1 1 1 1 I- 11 -i I
o.oz: r 7 �// r 7 — I— T —I— tI
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)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 15
Hydrograph for Subcatchment 7S: Predevelolpment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.08 0.00 0.00
5.00 0.18 0.00 0.00
7.50 0.31 0.00 0.00
10.00 0.52 0.00 0.00
12.50 2.11 0.08 0.12
15.00 2.45 0.16 0.03
17.50 2.62 0.21 0.02
20.00 2.73 0.24 0.01
22.50 2.82 0.27 0.01
25.00 2.87 0.29 0.00
27.50 2.87 0.29 0.00
30.00 2.87 0.29 0.00
32.50 2.87 0.29 0.00
35.00 2.87 0.29 0.00
37.50 2.87 0.29 0.00
40.00 2.87 0.29 0.00
42.50 2.87 0.29 0.00
45.00 2.87 0.29 0.00
47.50 2.87 0.29 0.00
50.00 2.87 0.29 0.00
52.50 2.87 0.29 0.00
55.00 2.87 0.29 0.00
57.50 2.87 0.29 0.00
60.00 2.87 0.29 0.00
62.50 2.87 0.29 0.00
65.00 2.87 0.29 0.00
67.50 2.87 0.29 0.00
70.00 2.87 0.29 0.00
72.50 2.87 0.29 0.00
75.00 2.87 0.29 0.00
77.50 2.87 0.29 0.00
80.00 2.87 0.29 0.00
82.50 2.87 0.29 0.00
85.00 2.87 0.29 0.00
87.50 2.87 0.29 0.00
90.00 2.87 0.29 0.00
92.50 2.87 0.29 0.00
95.00 2.87 0.29 0.00
97.50 2.87 0.29 0.00
100.00 2.87 0.29 0.00
102.50 2.87 0.29 0.00
105.00 2.87 0.29 0.00
107.50 2.87 0.29 0.00
110.00 2.87 0.29 0.00
112.50 2.87 0.29 0.00
115.00 2.87 0.29 0.00
117.50 2.87 0.29 0.00
120.00 2.87 0.29 0.00

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 16
Summary for Subcatchment 8S: BYPASS 1
Runoff = 1.14 cfs @ 12.13 hrs, Volume= 0.099 af, Depth= 0.56"
Routed to Link 11 L : POST DEV
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-Year Rainfall=2.87"
Area (ac) CN Description
1.180 60 Woods, Fair, HSG B
0.130 73 Woods, Fair, HSG C
0.170 61 >75% Grass cover, Good, HSG B
0.120 74 >75% Grass cover, Good, HSG C
0.310 80 >75% Grass cover, Good, HSG D
0.080 98 Paved parking, HSG B
0.090 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
2.120 68 Weighted Average
1.910 90.09% Pervious Area
0.210 9.91% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.8 249 0.0472 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.1 278 0.0398 37.88 454.62 Channel Flow,
Area= 12.0 sf Perim= 7.2' r= 1.67'
n= 0.011 Concrete pipe, straight & clean
17.8 627 Total

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 17
Subcatchment 8S: BYPASS 1
Hydrograph
1 1 1 1 1 1 I 1 1
I I 1 I I 1 I I I I I I I 1 1 ❑Runoff
i 1.14cfs l 1 I I 1 I I 1 I I 1 1 I 1 I 1 1
' I I 1 I I 1 I I 1 1 I Type I1124-h r
/ 1 -I- + 1.Year R1,aiiifaI1-2.871'1 1 i i i 1
1 1Runbff Awes=2.120 at
1 / I I I I I 1 1 I I 1 1
Runoff Volume=0.099 of
y / u;ngff',Depth 0.'156�'
LL / 11 1 1 1 FIOw ltength=627'
/ I I 1 1 I ITc=17.18 min
mil r6Ki. i2
1 1 1 1 1 1 "1 6
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
III 1 1 ' 1 1
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)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 18
Hydrograph for Subcatchment 8S: BYPASS 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.08 0.00 0.00
5.00 0.18 0.00 0.00
7.50 0.31 0.00 0.00
10.00 0.52 0.00 0.00
12.50 2.11 0.23 0.36
15.00 2.45 0.37 0.08
17.50 2.62 0.44 0.06
20.00 2.73 0.49 0.04
22.50 2.82 0.54 0.04
25.00 2.87 0.56 0.00
27.50 2.87 0.56 0.00
30.00 2.87 0.56 0.00
32.50 2.87 0.56 0.00
35.00 2.87 0.56 0.00
37.50 2.87 0.56 0.00
40.00 2.87 0.56 0.00
42.50 2.87 0.56 0.00
45.00 2.87 0.56 0.00
47.50 2.87 0.56 0.00
50.00 2.87 0.56 0.00
52.50 2.87 0.56 0.00
55.00 2.87 0.56 0.00
57.50 2.87 0.56 0.00
60.00 2.87 0.56 0.00
62.50 2.87 0.56 0.00
65.00 2.87 0.56 0.00
67.50 2.87 0.56 0.00
70.00 2.87 0.56 0.00
72.50 2.87 0.56 0.00
75.00 2.87 0.56 0.00
77.50 2.87 0.56 0.00
80.00 2.87 0.56 0.00
82.50 2.87 0.56 0.00
85.00 2.87 0.56 0.00
87.50 2.87 0.56 0.00
90.00 2.87 0.56 0.00
92.50 2.87 0.56 0.00
95.00 2.87 0.56 0.00
97.50 2.87 0.56 0.00
100.00 2.87 0.56 0.00
102.50 2.87 0.56 0.00
105.00 2.87 0.56 0.00
107.50 2.87 0.56 0.00
110.00 2.87 0.56 0.00
112.50 2.87 0.56 0.00
115.00 2.87 0.56 0.00
117.50 2.87 0.56 0.00
120.00 2.87 0.56 0.00

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 19
Summary for Subcatchment 9S: Postdevelopment Point 2
Runoff = 0.13 cfs @ 12.34 hrs, Volume= 0.024 af, Depth= 0.29"
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-Year Rainfall=2.87"
Area (ac) CN Description
1.000 60 Woods, Fair, HSG B
1.000 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.5 93 0.0106 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
Subcatchment 9S: Postdevelopment Point 2
Hydrograph
-1 I ± I ± H - 1- t I- H - I -1 -1 fi -1 - - - I t -I - 1- -1 -
0.14 I I I I I I I I I I I I I I I I I I I I I ■Runoff
0.13 I IX= 1 I 1 I I 1 1 I 1 I I 1 I I 1 1 Icy I 1
I ! 1 I 1 I I 1 1 I 1 I I 1 I Type Itl24 hrr
0.12
0.11 1 / 1 —11— 1— -4 — I- -I- 4 -I - - -i�- aP �lllfa�ll�2. '-
Vil
o.i1 1 / I I 1 1 I 1 Rinbff Area=1.000 ad
-r -/ . - r7 - I- rt -1- 7 -I - I- rt -I- r —I — r7 - 1- 7 -I - r7 -
0.09 _4 _ I- -I- 1_ _l — I— _L —I— —I - 1— RunaffVol ume40!024 af_
0.08 1 1 1 1 1 1 1 1 1 1 FIWIF _IO ^PP411 e i^I„
0.07 / FI4�T�.J`Tr�7 I
. — r - — I— t -1— -h —I - 1— —h —I— fi -fibvvterlgfh 93'-
LL 0.06 1_ -1- 1_ 1 _ 1_ 1 _1_ LJ _ I_ 1 _I- L _I _ I- _ _ 1_ L _I _ 1 _ _
0.05 1 11 I I I 1 1 I 1 I I 1 SlolTpe=0.0106 /''
0.04 ▪ 1 -I - - I- -I- - I- - - -1 - I- 4 = 8.�11
,�i -
0.03 % 1 1 1 1 1 1 1 1 1 QnIt6O
0.02 1 I / I I I I I 1 I I I I I I
—I 1
0.01 �%
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)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 20
Hydrograph for Subcatchment 9S: Postdevelopment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.08 0.00 0.00
5.00 0.18 0.00 0.00
7.50 0.31 0.00 0.00
10.00 0.52 0.00 0.00
12.50 2.11 0.08 0.10
15.00 2.45 0.16 0.02
17.50 2.62 0.21 0.02
20.00 2.73 0.24 0.01
22.50 2.82 0.27 0.01
25.00 2.87 0.29 0.00
27.50 2.87 0.29 0.00
30.00 2.87 0.29 0.00
32.50 2.87 0.29 0.00
35.00 2.87 0.29 0.00
37.50 2.87 0.29 0.00
40.00 2.87 0.29 0.00
42.50 2.87 0.29 0.00
45.00 2.87 0.29 0.00
47.50 2.87 0.29 0.00
50.00 2.87 0.29 0.00
52.50 2.87 0.29 0.00
55.00 2.87 0.29 0.00
57.50 2.87 0.29 0.00
60.00 2.87 0.29 0.00
62.50 2.87 0.29 0.00
65.00 2.87 0.29 0.00
67.50 2.87 0.29 0.00
70.00 2.87 0.29 0.00
72.50 2.87 0.29 0.00
75.00 2.87 0.29 0.00
77.50 2.87 0.29 0.00
80.00 2.87 0.29 0.00
82.50 2.87 0.29 0.00
85.00 2.87 0.29 0.00
87.50 2.87 0.29 0.00
90.00 2.87 0.29 0.00
92.50 2.87 0.29 0.00
95.00 2.87 0.29 0.00
97.50 2.87 0.29 0.00
100.00 2.87 0.29 0.00
102.50 2.87 0.29 0.00
105.00 2.87 0.29 0.00
107.50 2.87 0.29 0.00
110.00 2.87 0.29 0.00
112.50 2.87 0.29 0.00
115.00 2.87 0.29 0.00
117.50 2.87 0.29 0.00
120.00 2.87 0.29 0.00

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 21
Summary for Pond 12P: POND
[44] Hint: Outlet device#2 is below defined storage
Inflow Area = 2.340 ac, 48.29% Impervious, Inflow Depth = 1.21" for 1-Year event
Inflow = 5.12 cfs @ 11.96 hrs, Volume= 0.237 af
Outflow = 0.15 cfs @ 15.01 hrs, Volume= 0.237 af, Atten= 97%, Lag= 183.1 min
Primary = 0.15 cfs @ 15.01 hrs, Volume= 0.237 af
Routed to Link 11 L : POST DEV
Secondary= 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to Link 11 L : POST DEV
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 578.45'@ 15.01 hrs Surf.Area= 4,842 sf Storage= 6,097 cf
Plug-Flow detention time=677.2 min calculated for 0.237 af(100% of inflow)
Center-of-Mass det. time=677.5 min ( 1,518.4 - 840.9 )
Volume Invert Avail.Storage Storage Description
#1 577.00' 38,262 cf Custom Stage Data (Prismatic)Listed below(Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
577.00 3,579 0 0
578.00 4,438 4,009 4,009
579.00 5,335 4,887 8,895
580.00 6,289 5,812 14,707
581.00 7,299 6,794 21,501
582.00 8,366 7,833 29,334
583.00 9,490 8,928 38,262
Device Routing Invert Outlet Devices
#1 Primary 575.50' 15.0" Round Culvert
L= 57.4' RCP, rounded edge headwall, Ke= 0.100
Inlet/ Outlet Invert= 575.50'/ 573.63' S= 0.0326 '/' Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf
#2 Device 1 575.50' SAND FILTER
Head (feet) 0.00 1.00 1.50 2.50 3.50 4.50 5.50 6.50
Disch. (cfs) 0.000 0.052 0.060 0.077 0.095 0.112 0.129 0.146
#3 Device 1 578.21' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#4 Device 1 578.89' 15.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1 579.63' 6.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#6 Device 1 580.18' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#7 Device 1 580.80' 2.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32
#8 Device 1 581.00' 3.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 22
#9 Secondary 582.00' 20.0' long x 16.0' breadth EMERGENCY SPILLWAY
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=0.15 cfs @ 15.01 hrs HW=578.45' (Free Discharge)
4-1=Culvert (Passes 0.15 cfs of 11.92 cfs potential flow)
2=SAND FILTER (Custom Controls 0.09 cfs)
3=Orifice/Grate (Orifice Controls 0.06 cfs @ 1.78 fps)
=Orifice/Grate ( Controls 0.00 cfs)
5=Orifice/Grate ( Controls 0.00 cfs)
=Orifice/Grate ( Controls 0.00 cfs)
7=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
8=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=577.00' (Free Discharge)
4-9=EMERGENCY SPILLWAY( Controls 0.00 cfs)
Pond 12P: POND
Hydrograph
I I 1 1 1 1 1 1 1 1 ❑Inflow
5.12 cfs -h 1- fi ❑Outflow
Inflow Area=2.340 ac ❑Primary
i I I I I I ❑Secondary
/
I Peak EIev=578.45'
5 -I- '7 -t -I - 1- I- 1
I I I 1 I 1 Storage=6,097 cf
I I I 1 I 1 1 1 1 1 1
4 -I- 1- fi -I - I- 1- fi -1 - I- 1- rt -I - I- firt -I-
1 I I I I I I I I I I 1 1 1
w / 1 I I I I I I I I I I 1 I 1
3 -1- 1- rt 1 1 r rt 1 1 r rt 1 t 1 1 I
I 1 1 1 1 1 1 1 1 1 1 1 1 I 1
0
LL I 1 1 1 1 1 1 1 1 1 1 1 1 I 1
2 I r rt 1 1 r rt l l r rt 1 I r -r 1 I
1 I I 1 1 1 1 1 1 1 1 1 1 1 1
j% 1 1 1 1 1 1 1 1 1 1
1 0.15 cfs
A 0.15 cfs .'/
00 cfs / �/
0. %//////////////////////////////////////////////////////////////////////////////////////////
o
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)

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 23
Pond 12P: POND
Stage-Discharge
I I I I ❑Total
583 ❑Primary
❑Secondary
EMERGENCY SPILLWAY
582 1 1 / , 1
*/� Broad-Crested Rectangular Weir
Broad-Crested Rectangular Weir I 1
581 o / I 1
5 Orifice/Grate I 1
I
c 580 �- /0 Orifice/Grate I
/ I I I I I
Orifice/Grate
w 1
579 7 1
Orifice/Grate I 1
578 O% 1 1
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Discharge (cfs)
Pond 12P: POND
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 500 1,000 1,500 2,000 2,500 3,000 3,5004,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 0 Surface
. . ' . . . ! . . . ' . . .
. . . ! . . . I . ( . I . . . ! . . . I . . . I . . . 1 , , . I . . . ' . . . 1 . . . I . . . ' . . . ! . . . ❑Storage
:::
� I 11 II 1 1 I 1 1 I 1 I I I ////' II I 1 1
_ I I I I II I I I I ��/�/
' ,, " I I I II I I I
581
11 I I I I I II I I I
a 580- 1 I I .. "/ . I II I 1 1 I II 1 I I
d _ — I H + + I + I i+ r 1+ + + —II— I H r +
w - I I I I I I II I I I
579-"
I I II I 1 1 I II 1 I I
- n - — — r — — - - r - 1- I1 tt — r1r - — + II1rtrr
578
II I I I 1 II I 1 1
/ / /
- Custom Stage Data / z / /
577
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000
Storage(cubic-feet)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 24
Hydrograph for Pond 12P: POND
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 577.00 0.00 0.00 0.00
2.50 0.00 0 577.00 0.00 0.00 0.00
5.00 0.00 0 577.00 0.00 0.00 0.00
7.50 0.00 0 577.00 0.00 0.00 0.00
10.00 0.01 5 577.00 0.00 0.00 0.00
12.50 0.46 5,244 578.27 0.09 0.09 0.00
15.00 0.15 6,098 578.45 0.15 0.15 0.00
17.50 0.10 5,864 578.40 0.13 0.13 0.00
20.00 0.07 5,514 578.33 0.11 0.11 0.00
22.50 0.06 5,213 578.26 0.09 0.09 0.00
25.00 0.00 4,790 578.17 0.08 0.08 0.00
27.50 0.00 4,082 578.02 0.08 0.08 0.00
30.00 0.00 3,398 577.86 0.07 0.07 0.00
32.50 0.00 2,738 577.71 0.07 0.07 0.00
35.00 0.00 2,102 577.55 0.07 0.07 0.00
37.50 0.00 1,490 577.40 0.07 0.07 0.00
40.00 0.00 901 577.24 0.06 0.06 0.00
42.50 0.00 335 577.09 0.06 0.06 0.00
45.00 0.00 29 577.01 0.01 0.01 0.00
47.50 0.00 2 577.00 0.00 0.00 0.00
50.00 0.00 0 577.00 0.00 0.00 0.00
52.50 0.00 0 577.00 0.00 0.00 0.00
55.00 0.00 0 577.00 0.00 0.00 0.00
57.50 0.00 0 577.00 0.00 0.00 0.00
60.00 0.00 0 577.00 0.00 0.00 0.00
62.50 0.00 0 577.00 0.00 0.00 0.00
65.00 0.00 0 577.00 0.00 0.00 0.00
67.50 0.00 0 577.00 0.00 0.00 0.00
70.00 0.00 0 577.00 0.00 0.00 0.00
72.50 0.00 0 577.00 0.00 0.00 0.00
75.00 0.00 0 577.00 0.00 0.00 0.00
77.50 0.00 0 577.00 0.00 0.00 0.00
80.00 0.00 0 577.00 0.00 0.00 0.00
82.50 0.00 0 577.00 0.00 0.00 0.00
85.00 0.00 0 577.00 0.00 0.00 0.00
87.50 0.00 0 577.00 0.00 0.00 0.00
90.00 0.00 0 577.00 0.00 0.00 0.00
92.50 0.00 0 577.00 0.00 0.00 0.00
95.00 0.00 0 577.00 0.00 0.00 0.00
97.50 0.00 0 577.00 0.00 0.00 0.00
100.00 0.00 0 577.00 0.00 0.00 0.00
102.50 0.00 0 577.00 0.00 0.00 0.00
105.00 0.00 0 577.00 0.00 0.00 0.00
107.50 0.00 0 577.00 0.00 0.00 0.00
110.00 0.00 0 577.00 0.00 0.00 0.00
112.50 0.00 0 577.00 0.00 0.00 0.00
115.00 0.00 0 577.00 0.00 0.00 0.00
117.50 0.00 0 577.00 0.00 0.00 0.00
120.00 0.00 0 577.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 25
Stage-Discharge for Pond 12P: POND
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
577.00 0.00 0.00 0.00 582.20 21.86 17.06 4.79
577.10 0.06 0.06 0.00 582.30 26.02 17.18 8.84
577.20 0.06 0.06 0.00 582.40 30.96 17.29 13.66
577.30 0.07 0.07 0.00 582.50 36.50 17.41 19.09
577.40 0.07 0.07 0.00 582.60 42.62 17.52 25.10
577.50 0.07 0.07 0.00 582.70 48.91 17.64 31.27
577.60 0.07 0.07 0.00 582.80 55.53 17.75 37.78
577.70 0.07 0.07 0.00 582.90 62.86 17.86 45.00
577.80 0.07 0.07 0.00 583.00 70.57 17.97 52.60
577.90 0.08 0.08 0.00
578.00 0.08 0.08 0.00
578.10 0.08 0.08 0.00
578.20 0.08 0.08 0.00
578.30 0.10 0.10 0.00
578.40 0.13 0.13 0.00
578.50 0.16 0.16 0.00
578.60 0.18 0.18 0.00
578.70 0.19 0.19 0.00
578.80 0.21 0.21 0.00
578.90 0.22 0.22 0.00
579.00 0.38 0.38 0.00
579.10 0.63 0.63 0.00
579.20 0.89 0.89 0.00
579.30 1.06 1.06 0.00
579.40 1.20 1.20 0.00
579.50 1.33 1.33 0.00
579.60 1.44 1.44 0.00
579.70 1.57 1.57 0.00
579.80 1.75 1.75 0.00
579.90 1.95 1.95 0.00
580.00 2.11 2.11 0.00
580.10 2.25 2.25 0.00
580.20 2.38 2.38 0.00
580.30 2.54 2.54 0.00
580.40 2.74 2.74 0.00
580.50 2.97 2.97 0.00
580.60 3.21 3.21 0.00
580.70 3.41 3.41 0.00
580.80 3.58 3.58 0.00
580.90 4.46 4.46 0.00
581.00 5.91 5.91 0.00
581.10 8.87 8.87 0.00
581.20 13.10 13.10 0.00
581.30 15.98 15.98 0.00
581.40 16.10 16.10 0.00
581.50 16.23 16.23 0.00
581.60 16.35 16.35 0.00
581.70 16.47 16.47 0.00
581.80 16.59 16.59 0.00
581.90 16.71 16.71 0.00
582.00 16.83 16.83 0.00
582.10 18.64 16.95 1.69

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 26
Stage-Area-Storage for Pond 12P: POND
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
577.00 3,579 0 582.20 8,591 31,029
577.10 3,665 362 582.30 8,703 31,894
577.20 3,751 733 582.40 8,816 32,770
577.30 3,837 1,112 582.50 8,928 33,657
577.40 3,923 1,500 582.60 9,040 34,555
577.50 4,009 1,897 582.70 9,153 35,465
577.60 4,094 2,302 582.80 9,265 36,386
577.70 4,180 2,716 582.90 9,378 37,318
577.80 4,266 3,138 583.00 9,490 38,262
577.90 4,352 3,569
578.00 4,438 4,009
578.10 4,528 4,457
578.20 4,617 4,914
578.30 4,707 5,380
578.40 4,797 5,855
578.50 4,887 6,340
578.60 4,976 6,833
578.70 5,066 7,335
578.80 5,156 7,846
578.90 5,245 8,366
579.00 5,335 8,895
579.10 5,430 9,433
579.20 5,526 9,981
579.30 5,621 10,538
579.40 5,717 11,105
579.50 5,812 11,682
579.60 5,907 12,268
579.70 6,003 12,863
579.80 6,098 13,468
579.90 6,194 14,083
580.00 6,289 14,707
580.10 6,390 15,341
580.20 6,491 15,985
580.30 6,592 16,639
580.40 6,693 17,303
580.50 6,794 17,978
580.60 6,895 18,662
580.70 6,996 19,357
580.80 7,097 20,061
580.90 7,198 20,776
581.00 7,299 21,501
581.10 7,406 22,236
581.20 7,512 22,982
581.30 7,619 23,739
581.40 7,726 24,506
581.50 7,833 25,284
581.60 7,939 26,072
581.70 8,046 26,872
581.80 8,153 27,682
581.90 8,259 28,502
582.00 8,366 29,334
582.10 8,478 30,176

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 27
Summary for Link 6L: PRE DEV
Inflow Area = 4.340 ac, 4.61% Impervious, Inflow Depth = 0.45" for 1-Year event
Inflow = 1.22 cfs @ 12.28 hrs, Volume= 0.162 af
Primary = 1.22 cfs @ 12.28 hrs, Volume= 0.162 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 6L: PRE DEV
Hydrograph
/ I I
I I
I I ❑ Inflow
122 cfs I ❑Primary
1122cfs c/ I I Inflow Area=4.340 ac
4
0
T.
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)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 28
Hydrograph for Link 6L: PRE DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.00 0.00 0.00
10.00 0.00 0.00 0.00
12.50 0.83 0.00 0.83
15.00 0.15 0.00 0.15
17.50 0.10 0.00 0.10
20.00 0.07 0.00 0.07
22.50 0.06 0.00 0.06
25.00 0.00 0.00 0.00
27.50 0.00 0.00 0.00
30.00 0.00 0.00 0.00
32.50 0.00 0.00 0.00
35.00 0.00 0.00 0.00
37.50 0.00 0.00 0.00
40.00 0.00 0.00 0.00
42.50 0.00 0.00 0.00
45.00 0.00 0.00 0.00
47.50 0.00 0.00 0.00
50.00 0.00 0.00 0.00
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type 1124-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 29
Summary for Link 11 L: POST DEV
Inflow Area = 4.460 ac, 30.04% Impervious, Inflow Depth = 0.90" for 1-Year event
Inflow = 1.22 cfs @ 12.13 hrs, Volume= 0.336 af
Primary = 1.22 cfs @ 12.13 hrs, Volume= 0.336 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 11 L: POST DEV
Hydrograph
/ I I
❑ Inflow
122 cfs I D Primary
lI22c1s1 Inflow Area=4.460 ac
17 I T
1
Vl
0
T.
I I
L,
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)

54647 - Drainage_Pre-Post Type II 24-hr 1-Year Rainfall=2.87"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 30
Hydrograph for Link 11 L: POST DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.00 0.00 0.00
10.00 0.00 0.00 0.00
12.50 0.45 0.00 0.45
15.00 0.23 0.00 0.23
17.50 0.19 0.00 0.19
20.00 0.15 0.00 0.15
22.50 0.12 0.00 0.12
25.00 0.08 0.00 0.08
27.50 0.08 0.00 0.08
30.00 0.07 0.00 0.07
32.50 0.07 0.00 0.07
35.00 0.07 0.00 0.07
37.50 0.07 0.00 0.07
40.00 0.06 0.00 0.06
42.50 0.06 0.00 0.06
45.00 0.01 0.00 0.01
47.50 0.00 0.00 0.00
50.00 0.00 0.00 0.00
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 31
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment3S: PredevelopmentPoint 1 Runoff Area=4.340 ac 4.61% Impervious Runoff Depth=0.74"
Flow Length=624' Tc=27.8 min CN=65 Runoff=2.36 cfs 0.266 af
Subcatchment4S: PostdevelopmentPoint Runoff Area=2.340 ac 48.29% Impervious Runoff Depth=1.68"
Tc=5.0 min CN=81 Runoff=7.10 cfs 0.328 af
Subcatchment7S: PredevelolpmentPoint 2 Runoff Area=1.110 ac 0.00% Impervious Runoff Depth=0.52"
Flow Length=114' Tc=32.3 min CN=60 Runoff=0.32 cfs 0.048 af
Subcatchment8S: BYPASS 1 Runoff Area=2.120 ac 9.91% Impervious Runoff Depth=0.88"
Flow Length=627' Tc=17.8 min CN=68 Runoff=1.99 cfs 0.156 af
Subcatchment9S: PostdevelopmentPoint 2 Runoff Area=1.000 ac 0.00% Impervious Runoff Depth=0.52"
Flow Length=93' Slope=0.0106 '/' Tc=28.5 min CN=60 Runoff=0.31 cfs 0.043 af
Pond 12P: POND Peak Elev=578.89' Storage=8,289 cf Inflow=7.10 cfs 0.328 af
Primary=0.22 cfs 0.328 af Secondary=0.00 cfs 0.000 af Outflow=0.22 cfs 0.328 af
Link 6L: PRE DEV Inflow=2.36 cfs 0.266 af
Primary=2.36 cfs 0.266 af
Link 11 L: POST DEV Inflow=2.16 cfs 0.485 af
Primary=2.16 cfs 0.485 af
Total Runoff Area = 10.910 ac Runoff Volume = 0.842 af Average Runoff Depth = 0.93"
85.88% Pervious = 9.370 ac 14.12% Impervious = 1.540 ac

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 32
Summary for Subcatchment 3S: Predevelopment Point 1
[47] Hint: Peak is 176% of capacity of segment#3
Runoff = 2.36 cfs @ 12.26 hrs, Volume= 0.266 af, Depth= 0.74"
Routed to Link 6L : PRE DEV
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 2-Year Rainfall=3.47"
Area (ac) CN Description
3.070 60 Woods, Fair, HSG B
0.320 73 Woods, Fair, HSG C
0.200 79 Woods, Fair, HSG D
0.120 56 Brush, Fair, HSG B
0.080 70 Brush, Fair, HSG C
0.350 77 Brush, Fair, HSG D
0.100 98 Paved parking, HSG B
0.060 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
4.340 65 Weighted Average
4.140 95.39% Pervious Area
0.200 4.61% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.9 254 0.0477 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
10.0 270 0.0391 0.45 1.34 Channel Flow, CHANNEL
Area= 3.0 sf Perim= 6.3' r= 0.48'
n= 0.400 Sheet flow: Woods+light brush
27.8 624 Total

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 33
Subcatchment 3S: Predevelopment Point 1
Hydrograph
1 1 1 1 1 1 1 11 1
I 1 I I 1 I I 1 I 1 I 1 1 ❑Runoff
12.36 cfs I ' I I 1 I I 1 I I 1 I 1 I 1 1
11 I I 1 I I 1 I 1Type 11124-h r
1 1 1 1 1 1 r-Rl1 7`'
2 I I � I I I I I I I I I 2� ' `T`a'' 1 1ainfall rJ.� 1
1 1 ' 1 1 II 'Runbff Awea=4.340 ad
1 1 1 1 1 1 I I I I I I I I I I
1 1 1 1 1 1 Runoff Volume=0.266 of
y 1 I Iu;ngff,Depth=0.741-'
I I I I I ' Fldw'ILength=624'
u 1 1
1 1 1 1 1 Tci;=27..1A'min
/ I I I I I 1 I8 N76$
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 i 1 1
0 , .,(.,.K.,
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)

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 34
Hydrograph for Subcatchment 3S: Predevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.10 0.00 0.00
5.00 0.22 0.00 0.00
7.50 0.38 0.00 0.00
10.00 0.63 0.00 0.00
12.50 2.55 0.32 1.47
15.00 2.96 0.49 0.22
17.50 3.16 0.58 0.15
20.00 3.30 0.65 0.11
22.50 3.41 0.71 0.09
25.00 3.47 0.74 0.00
27.50 3.47 0.74 0.00
30.00 3.47 0.74 0.00
32.50 3.47 0.74 0.00
35.00 3.47 0.74 0.00
37.50 3.47 0.74 0.00
40.00 3.47 0.74 0.00
42.50 3.47 0.74 0.00
45.00 3.47 0.74 0.00
47.50 3.47 0.74 0.00
50.00 3.47 0.74 0.00
52.50 3.47 0.74 0.00
55.00 3.47 0.74 0.00
57.50 3.47 0.74 0.00
60.00 3.47 0.74 0.00
62.50 3.47 0.74 0.00
65.00 3.47 0.74 0.00
67.50 3.47 0.74 0.00
70.00 3.47 0.74 0.00
72.50 3.47 0.74 0.00
75.00 3.47 0.74 0.00
77.50 3.47 0.74 0.00
80.00 3.47 0.74 0.00
82.50 3.47 0.74 0.00
85.00 3.47 0.74 0.00
87.50 3.47 0.74 0.00
90.00 3.47 0.74 0.00
92.50 3.47 0.74 0.00
95.00 3.47 0.74 0.00
97.50 3.47 0.74 0.00
100.00 3.47 0.74 0.00
102.50 3.47 0.74 0.00
105.00 3.47 0.74 0.00
107.50 3.47 0.74 0.00
110.00 3.47 0.74 0.00
112.50 3.47 0.74 0.00
115.00 3.47 0.74 0.00
117.50 3.47 0.74 0.00
120.00 3.47 0.74 0.00

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 35
Summary for Subcatchment 4S: Postdevelopment Point 1
[49] Hint: Tc<2dt may require smaller dt
Runoff = 7.10 cfs @ 11.96 hrs, Volume= 0.328 af, Depth= 1.68"
Routed to Pond 12P : POND
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 2-Year Rainfall=3.47"
Area (ac) CN Description
0.850 61 >75% Grass cover, Good, HSG B
0.010 74 >75% Grass cover, Good, HSG C
0.240 80 >75% Grass cover, Good, HSG D
1.000 98 Paved parking, HSG B
0.130 98 Paved parking, HSG C
0.110 60 Woods, Fair, HSG B
2.340 81 Weighted Average
1.210 51.71% Pervious Area
1.130 48.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, DIRECT
Subcatchment 4S: Postdevelopment Point 1
Hydrograph
I I I I I
- I I I I I I I I I ❑Runoff
I- _I7.10;sI T 1 L I I T I I I- - 1 ]-
1 I I 1 I I 1 I I 1 I ITy'pe II 24-hr
6-'
1 1 1 1 1 , 27Y- a�-R1ai i fa ll 3.�47 '
: 1 I I I I I Runoff Atea=2.340 ac
1 - -h -1 - I- -1- T -1- t 1 1
5= 1 I I 1 I I 1 Runoff Volume=0.328 of
w _ 1 1 1 1 1 1
4 1 1 1 1 Rulnoff Depth=1 .68"
/ 1 1 1 1 1 1 1 1 1 1 Tc-5.0 m i n
3_ 1 I I 1 I I 1 1 I 1 1 CN=81
1 I 1 I I 1 1 I 1 1 1 1
I I I I I I I I I I I I I I I I I I I
T T I- 1 1 7
1 1 1 1 1 1 1 1 1 1
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)

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 36
Hydrograph for Subcatchment 4S: Postdevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.10 0.00 0.00
5.00 0.22 0.00 0.00
7.50 0.38 0.00 0.00
10.00 0.63 0.01 0.04
12.50 2.55 0.98 0.61
15.00 2.96 1.28 0.19
17.50 3.16 1.44 0.12
20.00 3.30 1.55 0.09
22.50 3.41 1.64 0.08
25.00 3.47 1.68 0.00
27.50 3.47 1.68 0.00
30.00 3.47 1.68 0.00
32.50 3.47 1.68 0.00
35.00 3.47 1.68 0.00
37.50 3.47 1.68 0.00
40.00 3.47 1.68 0.00
42.50 3.47 1.68 0.00
45.00 3.47 1.68 0.00
47.50 3.47 1.68 0.00
50.00 3.47 1.68 0.00
52.50 3.47 1.68 0.00
55.00 3.47 1.68 0.00
57.50 3.47 1.68 0.00
60.00 3.47 1.68 0.00
62.50 3.47 1.68 0.00
65.00 3.47 1.68 0.00
67.50 3.47 1.68 0.00
70.00 3.47 1.68 0.00
72.50 3.47 1.68 0.00
75.00 3.47 1.68 0.00
77.50 3.47 1.68 0.00
80.00 3.47 1.68 0.00
82.50 3.47 1.68 0.00
85.00 3.47 1.68 0.00
87.50 3.47 1.68 0.00
90.00 3.47 1.68 0.00
92.50 3.47 1.68 0.00
95.00 3.47 1.68 0.00
97.50 3.47 1.68 0.00
100.00 3.47 1.68 0.00
102.50 3.47 1.68 0.00
105.00 3.47 1.68 0.00
107.50 3.47 1.68 0.00
110.00 3.47 1.68 0.00
112.50 3.47 1.68 0.00
115.00 3.47 1.68 0.00
117.50 3.47 1.68 0.00
120.00 3.47 1.68 0.00

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 37
Summary for Subcatchment 7S: Predevelolpment Point 2
Runoff = 0.32 cfs @ 12.35 hrs, Volume= 0.048 af, Depth= 0.52"
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 2-Year Rainfall=3.47"
Area (ac) CN Description
1.110 60 Woods, Fair, HSG B
1.110 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 100 0.0093 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
0.4 14 0.0121 0.55 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
32.3 114 Total
Subcatchment 7S: Predevelolpment Point 2
Hydrograph
/1 1 1 1 I 1 1 1 • 1 1 • 1 I I I I I
0.34- 1 1 1 1 I 1 1 1 I I I I I •Runoff
0.32. I II 0.32 cfs I 1 1 I I 1 1 I 1 1 I I 1 I I 1 1 I I 1
0.3y / I I I I I I I I I I I
I p�Type RI24 hr
'- 1 - r 7 - I- - -I- 7 -I - I- rt 1 -c "f N�fl 1 -1 r �o
0.28 ,- -I -/ - IH - I- t -I- tH - I- t -12�-{ all-- u,-faI193.4,�- -
0.26� 1_ H -/ _1 _ H H - 1- + _1_ _H H - 1- -Rti IV11 /'.t, eQ 1.�11-0-Q�.-
0.22� / -1 - 1 1- 1 Bumf lVmlume a0.048 af
cli 0,8 j 11 1 II Ou1�4 PP 90•$21
LL 0.16� 1- ntl 1- �1�#'
0.14/ 1 1 1 1 1 1 1 1 I I I I I I I I I I
0.12 I I / I I I I I I 1 I I 1 I 1Ta=32.3 nnin
0.1? I I I I I I I I IIIIIIIIrlkhLait
� - 1 - - -I - 77 - I- T -I- 7 -I - I- 7 -1- r —I - 1- 7 - I- 7 ' 'fl-/Ir 11-
0.08 1- 1 I -1 - I H - 1- t -1- t H - I- rt -I- t -I - I- I - I- fi -I - ]- H -
0.06� ,_ - H H - I- + -I- H H - I- H -1- f -I - I- 4 - I- + -I -
0.04- j_ �''�/// J - I- 4 -I- -I - I- -1- -k -I I- -I - I- 1
0.02
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)

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 38
Hydrograph for Subcatchment 7S: Predevelolpment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.10 0.00 0.00
5.00 0.22 0.00 0.00
7.50 0.38 0.00 0.00
10.00 0.63 0.00 0.00
12.50 2.55 0.19 0.27
15.00 2.96 0.32 0.05
17.50 3.16 0.39 0.03
20.00 3.30 0.45 0.02
22.50 3.41 0.49 0.02
25.00 3.47 0.52 0.00
27.50 3.47 0.52 0.00
30.00 3.47 0.52 0.00
32.50 3.47 0.52 0.00
35.00 3.47 0.52 0.00
37.50 3.47 0.52 0.00
40.00 3.47 0.52 0.00
42.50 3.47 0.52 0.00
45.00 3.47 0.52 0.00
47.50 3.47 0.52 0.00
50.00 3.47 0.52 0.00
52.50 3.47 0.52 0.00
55.00 3.47 0.52 0.00
57.50 3.47 0.52 0.00
60.00 3.47 0.52 0.00
62.50 3.47 0.52 0.00
65.00 3.47 0.52 0.00
67.50 3.47 0.52 0.00
70.00 3.47 0.52 0.00
72.50 3.47 0.52 0.00
75.00 3.47 0.52 0.00
77.50 3.47 0.52 0.00
80.00 3.47 0.52 0.00
82.50 3.47 0.52 0.00
85.00 3.47 0.52 0.00
87.50 3.47 0.52 0.00
90.00 3.47 0.52 0.00
92.50 3.47 0.52 0.00
95.00 3.47 0.52 0.00
97.50 3.47 0.52 0.00
100.00 3.47 0.52 0.00
102.50 3.47 0.52 0.00
105.00 3.47 0.52 0.00
107.50 3.47 0.52 0.00
110.00 3.47 0.52 0.00
112.50 3.47 0.52 0.00
115.00 3.47 0.52 0.00
117.50 3.47 0.52 0.00
120.00 3.47 0.52 0.00

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 39
Summary for Subcatchment 8S: BYPASS 1
Runoff = 1.99 cfs @ 12.12 hrs, Volume= 0.156 af, Depth= 0.88"
Routed to Link 11 L : POST DEV
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 2-Year Rainfall=3.47"
Area (ac) CN Description
1.180 60 Woods, Fair, HSG B
0.130 73 Woods, Fair, HSG C
0.170 61 >75% Grass cover, Good, HSG B
0.120 74 >75% Grass cover, Good, HSG C
0.310 80 >75% Grass cover, Good, HSG D
0.080 98 Paved parking, HSG B
0.090 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
2.120 68 Weighted Average
1.910 90.09% Pervious Area
0.210 9.91% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.8 249 0.0472 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.1 278 0.0398 37.88 454.62 Channel Flow,
Area= 12.0 sf Perim= 7.2' r= 1.67'
n= 0.011 Concrete pipe, straight & clean
17.8 627 Total

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 40
Subcatchment 8S: BYPASS 1
Hydrograph
Z I I I I I I 1 I I I
- I II I I I I I I I I I ' I I I ■Runoff
1.9901 T T T 1 T 7
2 I 1 I 1 1 1 1 1 (Type I1124-hr
i I I 1 1 2�Yearl Rlainfall�3.47"
1 I 1 1 I I 1Rundff Awea=2.120 at
I I I I I I I I I I I I I I I I I I I I I/
I I 1 I I 1 Runoff Volume=0.156 of
y 1 I Ou;ngff 11Depth40.081'
/
1 1 1 1 FIdwlLength=627'
u_ / 1 1 1 1 1 1 1 1 1
/ 1 1 I 1 1 I 1Tci;=17.18 min
/ 1 1 I 1 1 I 1 1 I rl id.
I I I I I I I I I I
I I I I I ' 1 1
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)

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 41
Hydrograph for Subcatchment 8S: BYPASS 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.10 0.00 0.00
5.00 0.22 0.00 0.00
7.50 0.38 0.00 0.00
10.00 0.63 0.00 0.00
12.50 2.55 0.41 0.57
15.00 2.96 0.61 0.12
17.50 3.16 0.71 0.08
20.00 3.30 0.79 0.06
22.50 3.41 0.85 0.05
25.00 3.47 0.88 0.00
27.50 3.47 0.88 0.00
30.00 3.47 0.88 0.00
32.50 3.47 0.88 0.00
35.00 3.47 0.88 0.00
37.50 3.47 0.88 0.00
40.00 3.47 0.88 0.00
42.50 3.47 0.88 0.00
45.00 3.47 0.88 0.00
47.50 3.47 0.88 0.00
50.00 3.47 0.88 0.00
52.50 3.47 0.88 0.00
55.00 3.47 0.88 0.00
57.50 3.47 0.88 0.00
60.00 3.47 0.88 0.00
62.50 3.47 0.88 0.00
65.00 3.47 0.88 0.00
67.50 3.47 0.88 0.00
70.00 3.47 0.88 0.00
72.50 3.47 0.88 0.00
75.00 3.47 0.88 0.00
77.50 3.47 0.88 0.00
80.00 3.47 0.88 0.00
82.50 3.47 0.88 0.00
85.00 3.47 0.88 0.00
87.50 3.47 0.88 0.00
90.00 3.47 0.88 0.00
92.50 3.47 0.88 0.00
95.00 3.47 0.88 0.00
97.50 3.47 0.88 0.00
100.00 3.47 0.88 0.00
102.50 3.47 0.88 0.00
105.00 3.47 0.88 0.00
107.50 3.47 0.88 0.00
110.00 3.47 0.88 0.00
112.50 3.47 0.88 0.00
115.00 3.47 0.88 0.00
117.50 3.47 0.88 0.00
120.00 3.47 0.88 0.00

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 42
Summary for Subcatchment 9S: Postdevelopment Point 2
Runoff = 0.31 cfs @ 12.30 hrs, Volume= 0.043 af, Depth= 0.52"
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 2-Year Rainfall=3.47"
Area (ac) CN Description
1.000 60 Woods, Fair, HSG B
1.000 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.5 93 0.0106 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
Subcatchment 9S: Postdevelopment Point 2
Hydrograph
H -I- 4 -I- HH - I- 4 -I- HH - I- H -I- -1 - I- 4 -I - -I -
0.34i-/ I I 1 1 I 1 I I 1 I I I I I I I I I I ■Runoff
0.324-/ I 10.31 cfs l 1 I 1 I I 1 I I I I I I I I I I I
0.3 I 1 I 1 I I 1 I 1 I I -TYPE) 14
/p1 I �PI2 hP
0.28� I I 1 1 1 1 1 1 1 1 1A l "aI TIIn�1704.17
0.26�
,- - -1- TT - I- T -1- TT - 1 -RLinbffTA1-ea=�I.00Oa7c-
0.24� r - -1- r - I- rt -I- r - I- rt - - -r -I - r rt - I- 4 -1 - r 4 -
0.22� + -I- H H I + 1 H H I Runof'f1V -Iume=10A4�a af-
• 0.• 18 L L L L I L 11 L L 11 L I 't_u1I`L"4" TP Q• €�
0 0.167- 1FI�WI to Ii'�7d�-
u 0.14� I 1 I 1 1 I I 1 1 I 1 1 I I 1 I I 1 1 I
0.12 - 1 1 1 1 1 1 1 1 1 1 1 1 1 1Io1pe=0.V I V V /'-
0.1 I 1 1 1 1 1 1 ITQ -L
-IT I T T I T I I T I T -I � � � 0. 1�1
0.08 1- jT 1 r T 1 I -r r rt T aN60
0.04- 4 H - I 4 - I- 4 - - - - - 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)

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 43
Hydrograph for Subcatchment 9S: Postdevelopment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.10 0.00 0.00
5.00 0.22 0.00 0.00
7.50 0.38 0.00 0.00
10.00 0.63 0.00 0.00
12.50 2.55 0.19 0.22
15.00 2.96 0.32 0.04
17.50 3.16 0.39 0.03
20.00 3.30 0.45 0.02
22.50 3.41 0.49 0.02
25.00 3.47 0.52 0.00
27.50 3.47 0.52 0.00
30.00 3.47 0.52 0.00
32.50 3.47 0.52 0.00
35.00 3.47 0.52 0.00
37.50 3.47 0.52 0.00
40.00 3.47 0.52 0.00
42.50 3.47 0.52 0.00
45.00 3.47 0.52 0.00
47.50 3.47 0.52 0.00
50.00 3.47 0.52 0.00
52.50 3.47 0.52 0.00
55.00 3.47 0.52 0.00
57.50 3.47 0.52 0.00
60.00 3.47 0.52 0.00
62.50 3.47 0.52 0.00
65.00 3.47 0.52 0.00
67.50 3.47 0.52 0.00
70.00 3.47 0.52 0.00
72.50 3.47 0.52 0.00
75.00 3.47 0.52 0.00
77.50 3.47 0.52 0.00
80.00 3.47 0.52 0.00
82.50 3.47 0.52 0.00
85.00 3.47 0.52 0.00
87.50 3.47 0.52 0.00
90.00 3.47 0.52 0.00
92.50 3.47 0.52 0.00
95.00 3.47 0.52 0.00
97.50 3.47 0.52 0.00
100.00 3.47 0.52 0.00
102.50 3.47 0.52 0.00
105.00 3.47 0.52 0.00
107.50 3.47 0.52 0.00
110.00 3.47 0.52 0.00
112.50 3.47 0.52 0.00
115.00 3.47 0.52 0.00
117.50 3.47 0.52 0.00
120.00 3.47 0.52 0.00

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 44
Summary for Pond 12P: POND
[44] Hint: Outlet device#2 is below defined storage
Inflow Area = 2.340 ac, 48.29% Impervious, Inflow Depth = 1.68" for 2-Year event
Inflow = 7.10 cfs @ 11.96 hrs, Volume= 0.328 af
Outflow = 0.22 cfs @ 14.36 hrs, Volume= 0.328 af, Atten= 97%, Lag= 144.2 min
Primary = 0.22 cfs @ 14.36 hrs, Volume= 0.328 af
Routed to Link 11 L : POST DEV
Secondary= 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to Link 11 L : POST DEV
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 578.89'@ 14.36 hrs Surf.Area= 5,232 sf Storage= 8,289 cf
Plug-Flow detention time=622.2 min calculated for 0.328 af(100% of inflow)
Center-of-Mass det. time=622.6 min ( 1,454.0 - 831.4 )
Volume Invert Avail.Storage Storage Description
#1 577.00' 38,262 cf Custom Stage Data (Prismatic)Listed below(Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
577.00 3,579 0 0
578.00 4,438 4,009 4,009
579.00 5,335 4,887 8,895
580.00 6,289 5,812 14,707
581.00 7,299 6,794 21,501
582.00 8,366 7,833 29,334
583.00 9,490 8,928 38,262
Device Routing Invert Outlet Devices
#1 Primary 575.50' 15.0" Round Culvert
L= 57.4' RCP, rounded edge headwall, Ke= 0.100
Inlet/ Outlet Invert= 575.50'/ 573.63' S= 0.0326 '/' Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf
#2 Device 1 575.50' SAND FILTER
Head (feet) 0.00 1.00 1.50 2.50 3.50 4.50 5.50 6.50
Disch. (cfs) 0.000 0.052 0.060 0.077 0.095 0.112 0.129 0.146
#3 Device 1 578.21' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#4 Device 1 578.89' 15.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1 579.63' 6.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#6 Device 1 580.18' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#7 Device 1 580.80' 2.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32
#8 Device 1 581.00' 3.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 45
#9 Secondary 582.00' 20.0' long x 16.0' breadth EMERGENCY SPILLWAY
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=0.22 cfs @ 14.36 hrs HW=578.89' (Free Discharge)
L1=Culvert (Passes 0.22 cfs of 12.62 cfs potential flow)
2=SAND FILTER (Custom Controls 0.09 cfs)
3=Orifice/Grate (Orifice Controls 0.12 cfs @ 3.64 fps)
=Orifice/Grate ( Controls 0.00 cfs)
5=Orifice/Grate ( Controls 0.00 cfs)
=Orifice/Grate ( Controls 0.00 cfs)
7=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
8=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=577.00' (Free Discharge)
L9=EMERGENCY SPILLWAY( Controls 0.00 cfs)
Pond 12P: POND
Hydrograph
I ❑Inflow
zfoofs ❑Outflow
Inflow Area=2340 ac ❑Primary
.
I I I I I I I I I I ❑Secondary
t 1 1 1 1 1 1 IPeak Elev=578.89` -
7 11 I I 1 I 1 I 1 1 I 1_i_ 4 1 I I- 4 1 1- -I 1 -SL#
ora9e=8,289 cf -
6 I I I I I I I I I I I I 1
1_ L 1 _1 _ 1_ J_ 1 _1 _ 1_ L _L _ 1 1
5 I I I I I 1 1
w / i i i
3 4
0
LL 3 /
2
z 0.22 cfs //ii //// ///�///////
/ / / i
1 0.22 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)

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 46
Pond 12P: POND
Stage-Discharge
I I I 1 ❑Total
583 ❑Primary
❑Secondary
EMERGENCY SPILLWAY
582 I I 4 I
/�// % I 1
*/� Broad-Crested Rectangular Weir
Broad-Crested Rectangular Weir I
581 o / I I
5 Orifice/Grate I
I
c 580 �- /0 Orifice/Grate I
/ I I I I I
Orifice/Grate
w 1
579 7 1
Orifice/Grate I
578 O% 1 1
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Discharge (cfs)
Pond 12P: POND
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 500 1,000 1,500 2,000 2,500 3,000 3,5004,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 0 Surface
. . ' . . . ! . . . ' . . .
. . . ! . . . I . ( . I . . . ! . . . I . . . I . . . 1 , , . I . . . ' . . . 1 . . . I . . . ' . . . ! . . . ❑Storage
:::
� I I I II 1 1 I 1 1 I 1 I I I ////' II I I I
_ I I I I II I I I I ��/�/
' ,, " 1 1 1 II 1 I I
581
11 I I I 1 I I 1 I I
a 580- 1 I I .. "/ . I II I 1 1 I I 1 I I
d _ — I H + + I + I i+ r I+ + + —II— I H r +
w - I I I I I I II I I I
579-"
I I II I I I I II I I I
- n — — r — — - - r - 1- I I tt — r 11 - — + II 1 rtrr
578
II I I I I II I I I
/ / /
- Custom Stage Data / z / /
577
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000
Storage(cubic-feet)

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 47
Hydrograph for Pond 12P: POND
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 577.00 0.00 0.00 0.00
2.50 0.00 0 577.00 0.00 0.00 0.00
5.00 0.00 0 577.00 0.00 0.00 0.00
7.50 0.00 0 577.00 0.00 0.00 0.00
10.00 0.04 51 577.01 0.01 0.01 0.00
12.50 0.61 7,472 578.73 0.20 0.20 0.00
15.00 0.19 8,260 578.88 0.22 0.22 0.00
17.50 0.12 7,714 578.77 0.20 0.20 0.00
20.00 0.09 6,940 578.62 0.18 0.18 0.00
22.50 0.08 6,189 578.47 0.15 0.15 0.00
25.00 0.00 5,440 578.31 0.10 0.10 0.00
27.50 0.00 4,673 578.15 0.08 0.08 0.00
30.00 0.00 3,969 577.99 0.08 0.08 0.00
32.50 0.00 3,289 577.84 0.07 0.07 0.00
35.00 0.00 2,633 577.68 0.07 0.07 0.00
37.50 0.00 2,001 577.53 0.07 0.07 0.00
40.00 0.00 1,392 577.37 0.07 0.07 0.00
42.50 0.00 807 577.22 0.06 0.06 0.00
45.00 0.00 245 577.07 0.06 0.06 0.00
47.50 0.00 20 577.01 0.01 0.01 0.00
50.00 0.00 2 577.00 0.00 0.00 0.00
52.50 0.00 0 577.00 0.00 0.00 0.00
55.00 0.00 0 577.00 0.00 0.00 0.00
57.50 0.00 0 577.00 0.00 0.00 0.00
60.00 0.00 0 577.00 0.00 0.00 0.00
62.50 0.00 0 577.00 0.00 0.00 0.00
65.00 0.00 0 577.00 0.00 0.00 0.00
67.50 0.00 0 577.00 0.00 0.00 0.00
70.00 0.00 0 577.00 0.00 0.00 0.00
72.50 0.00 0 577.00 0.00 0.00 0.00
75.00 0.00 0 577.00 0.00 0.00 0.00
77.50 0.00 0 577.00 0.00 0.00 0.00
80.00 0.00 0 577.00 0.00 0.00 0.00
82.50 0.00 0 577.00 0.00 0.00 0.00
85.00 0.00 0 577.00 0.00 0.00 0.00
87.50 0.00 0 577.00 0.00 0.00 0.00
90.00 0.00 0 577.00 0.00 0.00 0.00
92.50 0.00 0 577.00 0.00 0.00 0.00
95.00 0.00 0 577.00 0.00 0.00 0.00
97.50 0.00 0 577.00 0.00 0.00 0.00
100.00 0.00 0 577.00 0.00 0.00 0.00
102.50 0.00 0 577.00 0.00 0.00 0.00
105.00 0.00 0 577.00 0.00 0.00 0.00
107.50 0.00 0 577.00 0.00 0.00 0.00
110.00 0.00 0 577.00 0.00 0.00 0.00
112.50 0.00 0 577.00 0.00 0.00 0.00
115.00 0.00 0 577.00 0.00 0.00 0.00
117.50 0.00 0 577.00 0.00 0.00 0.00
120.00 0.00 0 577.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 48
Stage-Discharge for Pond 12P: POND
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
577.00 0.00 0.00 0.00 582.20 21.86 17.06 4.79
577.10 0.06 0.06 0.00 582.30 26.02 17.18 8.84
577.20 0.06 0.06 0.00 582.40 30.96 17.29 13.66
577.30 0.07 0.07 0.00 582.50 36.50 17.41 19.09
577.40 0.07 0.07 0.00 582.60 42.62 17.52 25.10
577.50 0.07 0.07 0.00 582.70 48.91 17.64 31.27
577.60 0.07 0.07 0.00 582.80 55.53 17.75 37.78
577.70 0.07 0.07 0.00 582.90 62.86 17.86 45.00
577.80 0.07 0.07 0.00 583.00 70.57 17.97 52.60
577.90 0.08 0.08 0.00
578.00 0.08 0.08 0.00
578.10 0.08 0.08 0.00
578.20 0.08 0.08 0.00
578.30 0.10 0.10 0.00
578.40 0.13 0.13 0.00
578.50 0.16 0.16 0.00
578.60 0.18 0.18 0.00
578.70 0.19 0.19 0.00
578.80 0.21 0.21 0.00
578.90 0.22 0.22 0.00
579.00 0.38 0.38 0.00
579.10 0.63 0.63 0.00
579.20 0.89 0.89 0.00
579.30 1.06 1.06 0.00
579.40 1.20 1.20 0.00
579.50 1.33 1.33 0.00
579.60 1.44 1.44 0.00
579.70 1.57 1.57 0.00
579.80 1.75 1.75 0.00
579.90 1.95 1.95 0.00
580.00 2.11 2.11 0.00
580.10 2.25 2.25 0.00
580.20 2.38 2.38 0.00
580.30 2.54 2.54 0.00
580.40 2.74 2.74 0.00
580.50 2.97 2.97 0.00
580.60 3.21 3.21 0.00
580.70 3.41 3.41 0.00
580.80 3.58 3.58 0.00
580.90 4.46 4.46 0.00
581.00 5.91 5.91 0.00
581.10 8.87 8.87 0.00
581.20 13.10 13.10 0.00
581.30 15.98 15.98 0.00
581.40 16.10 16.10 0.00
581.50 16.23 16.23 0.00
581.60 16.35 16.35 0.00
581.70 16.47 16.47 0.00
581.80 16.59 16.59 0.00
581.90 16.71 16.71 0.00
582.00 16.83 16.83 0.00
582.10 18.64 16.95 1.69

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 49
Stage-Area-Storage for Pond 12P: POND
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
577.00 3,579 0 582.20 8,591 31,029
577.10 3,665 362 582.30 8,703 31,894
577.20 3,751 733 582.40 8,816 32,770
577.30 3,837 1,112 582.50 8,928 33,657
577.40 3,923 1,500 582.60 9,040 34,555
577.50 4,009 1,897 582.70 9,153 35,465
577.60 4,094 2,302 582.80 9,265 36,386
577.70 4,180 2,716 582.90 9,378 37,318
577.80 4,266 3,138 583.00 9,490 38,262
577.90 4,352 3,569
578.00 4,438 4,009
578.10 4,528 4,457
578.20 4,617 4,914
578.30 4,707 5,380
578.40 4,797 5,855
578.50 4,887 6,340
578.60 4,976 6,833
578.70 5,066 7,335
578.80 5,156 7,846
578.90 5,245 8,366
579.00 5,335 8,895
579.10 5,430 9,433
579.20 5,526 9,981
579.30 5,621 10,538
579.40 5,717 11,105
579.50 5,812 11,682
579.60 5,907 12,268
579.70 6,003 12,863
579.80 6,098 13,468
579.90 6,194 14,083
580.00 6,289 14,707
580.10 6,390 15,341
580.20 6,491 15,985
580.30 6,592 16,639
580.40 6,693 17,303
580.50 6,794 17,978
580.60 6,895 18,662
580.70 6,996 19,357
580.80 7,097 20,061
580.90 7,198 20,776
581.00 7,299 21,501
581.10 7,406 22,236
581.20 7,512 22,982
581.30 7,619 23,739
581.40 7,726 24,506
581.50 7,833 25,284
581.60 7,939 26,072
581.70 8,046 26,872
581.80 8,153 27,682
581.90 8,259 28,502
582.00 8,366 29,334
582.10 8,478 30,176

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 50
Summary for Link 6L: PRE DEV
Inflow Area = 4.340 ac, 4.61% Impervious, Inflow Depth = 0.74" for 2-Year event
Inflow = 2.36 cfs @ 12.26 hrs, Volume= 0.266 af
Primary = 2.36 cfs @ 12.26 hrs, Volume= 0.266 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 6L: PRE DEV
Hydrograph
I I I I 1 1 1
I I 1 I 1 I 1 I 1 1 ❑ Inflow `
- 12.36 cfs I I 1 1 1 1 1 1 1 ,_El Primary
I
- l2.375 I I 1 1 Inflow lArea=4.3401ac
L 1 _ I_ 1 _I _ L A _I_ L LI _ I_ 1 LI _ L 1 1_ L J I_ 1
/ 1 1 1 1 1 1 1 1 1 I I
2—' I I I I I I I I I I I I I I I I I I I
/ 1 1 1 1 1 1 1 1 I I I 1 1 1 1 1 1 1 1 I 1 I I
-
1 11 I I I I I
0 - / 1 1 1
3
0
T.
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)

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 51
Hydrograph for Link 6L: PRE DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.00 0.00 0.00
10.00 0.00 0.00 0.00
12.50 1.47 0.00 1.47
15.00 0.22 0.00 0.22
17.50 0.15 0.00 0.15
20.00 0.11 0.00 0.11
22.50 0.09 0.00 0.09
25.00 0.00 0.00 0.00
27.50 0.00 0.00 0.00
30.00 0.00 0.00 0.00
32.50 0.00 0.00 0.00
35.00 0.00 0.00 0.00
37.50 0.00 0.00 0.00
40.00 0.00 0.00 0.00
42.50 0.00 0.00 0.00
45.00 0.00 0.00 0.00
47.50 0.00 0.00 0.00
50.00 0.00 0.00 0.00
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type 1124-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 52
Summary for Link 11 L: POST DEV
Inflow Area = 4.460 ac, 30.04% Impervious, Inflow Depth = 1.30" for 2-Year event
Inflow = 2.16 cfs @ 12.12 hrs, Volume= 0.485 of
Primary = 2.16 cfs @ 12.12 hrs, Volume= 0.485 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 11 L: POST DEV
Hydrograph
I I I I
I I I I ❑ Inflow
12.16 cfs ,❑Primary
2.1 cfs r Inflow 1Area=4.460 ac
2—
0 ((Sf� ,Sr rr 'Sr frrirrr5rr'Sr rr ,ir rrrTfr/Sf� ,
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)

54647 - Drainage_Pre-Post Type II 24-hr 2-Year Rainfall=3.47"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 53
Hydrograph for Link 11 L: POST DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.00 0.00 0.00
10.00 0.01 0.00 0.01
12.50 0.76 0.00 0.76
15.00 0.34 0.00 0.34
17.50 0.28 0.00 0.28
20.00 0.24 0.00 0.24
22.50 0.20 0.00 0.20
25.00 0.10 0.00 0.10
27.50 0.08 0.00 0.08
30.00 0.08 0.00 0.08
32.50 0.07 0.00 0.07
35.00 0.07 0.00 0.07
37.50 0.07 0.00 0.07
40.00 0.07 0.00 0.07
42.50 0.06 0.00 0.06
45.00 0.06 0.00 0.06
47.50 0.01 0.00 0.01
50.00 0.00 0.00 0.00
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 54
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment3S: PredevelopmentPoint 1 Runoff Area=4.340 ac 4.61% Impervious Runoff Depth=1.69"
Flow Length=624' Tc=27.8 min CN=65 Runoff=6.26 cfs 0.610 af
Subcatchment4S: PostdevelopmentPoint Runoff Area=2.340 ac 48.29% Impervious Runoff Depth=3.03"
Tc=5.0 min CN=81 Runoff=12.57 cfs 0.591 af
Subcatchment7S: PredevelolpmentPoint 2 Runoff Area=1.110 ac 0.00% Impervious Runoff Depth=1.33"
Flow Length=114' Tc=32.3 min CN=60 Runoff=1.07 cfs 0.123 af
Subcatchment8S: BYPASS 1 Runoff Area=2.120 ac 9.91% Impervious Runoff Depth=1.92"
Flow Length=627' Tc=17.8 min CN=68 Runoff=4.68 cfs 0.338 af
Subcatchment9S: PostdevelopmentPoint 2 Runoff Area=1.000 ac 0.00% Impervious Runoff Depth=1.33"
Flow Length=93' Slope=0.0106 '/' Tc=28.5 min CN=60 Runoff=1.05 cfs 0.111 af
Pond 12P: POND Peak Elev=579.63' Storage=12,438 cf Inflow=12.57 cfs 0.591 af
Primary=1.47 cfs 0.591 af Secondary=0.00 cfs 0.000 af Outflow=1.47 cfs 0.591 af
Link 6L: PRE DEV Inflow=6.26 cfs 0.610 af
Primary=6.26 cfs 0.610 af
Link 11 L: POST DEV Inflow=6.12 cfs 0.929 af
Primary=6.12 cfs 0.929 af
Total Runoff Area = 10.910 ac Runoff Volume = 1.773 af Average Runoff Depth = 1.95"
85.88% Pervious = 9.370 ac 14.12% Impervious = 1.540 ac

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 55
Summary for Subcatchment 3S: Predevelopment Point 1
[47] Hint: Peak is 466% of capacity of segment#3
Runoff = 6.26 cfs @ 12.24 hrs, Volume= 0.610 af, Depth= 1.69"
Routed to Link 6L : PRE DEV
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 10-Year Rainfall=5.05"
Area (ac) CN Description
3.070 60 Woods, Fair, HSG B
0.320 73 Woods, Fair, HSG C
0.200 79 Woods, Fair, HSG D
0.120 56 Brush, Fair, HSG B
0.080 70 Brush, Fair, HSG C
0.350 77 Brush, Fair, HSG D
0.100 98 Paved parking, HSG B
0.060 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
4.340 65 Weighted Average
4.140 95.39% Pervious Area
0.200 4.61% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.9 254 0.0477 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
10.0 270 0.0391 0.45 1.34 Channel Flow, CHANNEL
Area= 3.0 sf Perim= 6.3' r= 0.48'
n= 0.400 Sheet flow: Woods+light brush
27.8 624 Total

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 56
Subcatchment 3S: Predevelopment Point 1
Hydrograph
I 1 7 I 1 7 I I T I 1 I I 7 1 -
7- I I I I I I I I I I 1 I I I I I I I ■Runoff
1626.fs l I I 1 I I 1 I I 1 I 1 1 I I 1 1
6L 1 I 1 I I 1 I I 1 I IType 1*I12411r -
1 1 1 10-Year, Mai Inf0=ir5.00"
5L/ ' ' 1 ' ' 1 I 'Runbff Area=4.340 ad- 1 I I 1 I I 1 I I I I I I I I I I I
-+ -+ 1 1- I 1 -i + 1 1- RuneffVoI6ime0-.61-0-a' -
u 4- 1 I 11 11 II iulnQff11D9P;h7-1.1,691.1
rt fi 1 rt 1 rt fi 1 r IOrtw'Le-nc1th=624+ -
3_ I / I I I 1 I I 1 I I I I I I I I 1 1
I I 1 I I 1 I I 1 1 1 I Tc=27.I8 nl i n
2� 11 1 1 1 1 11 III 1 1 %f��6ri
1� 1i I
1 6 1 1 1 1 1 1
o 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)

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 57
Hydrograph for Subcatchment 3S: Predevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.14 0.00 0.00
5.00 0.32 0.00 0.00
7.50 0.55 0.00 0.00
10.00 0.91 0.00 0.00
12.50 3.71 0.87 3.51
15.00 4.31 1.21 0.44
17.50 4.60 1.40 0.28
20.00 4.81 1.53 0.20
22.50 4.96 1.63 0.17
25.00 5.05 1.69 0.00
27.50 5.05 1.69 0.00
30.00 5.05 1.69 0.00
32.50 5.05 1.69 0.00
35.00 5.05 1.69 0.00
37.50 5.05 1.69 0.00
40.00 5.05 1.69 0.00
42.50 5.05 1.69 0.00
45.00 5.05 1.69 0.00
47.50 5.05 1.69 0.00
50.00 5.05 1.69 0.00
52.50 5.05 1.69 0.00
55.00 5.05 1.69 0.00
57.50 5.05 1.69 0.00
60.00 5.05 1.69 0.00
62.50 5.05 1.69 0.00
65.00 5.05 1.69 0.00
67.50 5.05 1.69 0.00
70.00 5.05 1.69 0.00
72.50 5.05 1.69 0.00
75.00 5.05 1.69 0.00
77.50 5.05 1.69 0.00
80.00 5.05 1.69 0.00
82.50 5.05 1.69 0.00
85.00 5.05 1.69 0.00
87.50 5.05 1.69 0.00
90.00 5.05 1.69 0.00
92.50 5.05 1.69 0.00
95.00 5.05 1.69 0.00
97.50 5.05 1.69 0.00
100.00 5.05 1.69 0.00
102.50 5.05 1.69 0.00
105.00 5.05 1.69 0.00
107.50 5.05 1.69 0.00
110.00 5.05 1.69 0.00
112.50 5.05 1.69 0.00
115.00 5.05 1.69 0.00
117.50 5.05 1.69 0.00
120.00 5.05 1.69 0.00

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 58
Summary for Subcatchment 4S: Postdevelopment Point 1
[49] Hint: Tc<2dt may require smaller dt
Runoff = 12.57 cfs @ 11.96 hrs, Volume= 0.591 af, Depth= 3.03"
Routed to Pond 12P : POND
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 10-Year Rainfall=5.05"
Area (ac) CN Description
0.850 61 >75% Grass cover, Good, HSG B
0.010 74 >75% Grass cover, Good, HSG C
0.240 80 >75% Grass cover, Good, HSG D
1.000 98 Paved parking, HSG B
0.130 98 Paved parking, HSG C
0.110 60 Woods, Fair, HSG B
2.340 81 Weighted Average
1.210 51.71% Pervious Area
1.130 48.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, DIRECT
Subcatchment 4S: Postdevelopment Point 1
Hydrograph
— I— rt I — I— rt —I— t —I— -r -I - - -r -I -
14_ I L _ L A I L I L -I- L -1 L ILI L ■Runoff
13� 112.57 cis 11 I i I I 1 1 I I 1 1 1 1 I II 1
12 1 I I 1 1 I I 1 1 I I 1Typelli 24 r
11 / + + I I 1 1u7Year 1 KainfallT5.b51
_ 11 1 I I 1 Ru nbfP Area=1.340 ad
- 7 1 - I- 7 -I- T -I- T -I - I- 7 - I- T -I- T -1 - 7 -
91/ - 1 I- 4 -1 1- IRunoffNoiu-meg0.591-af
5� I I I I I I I I I I I 1 CN811
4
4 - I- - 1- 4 -1- T -1- -1 - 1 — 1— 4 —1— T —I — -
3� I 1 1 1 1 1 1 1 I 1 1
� -
2 / I I
1:
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)

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 59
Hydrograph for Subcatchment 4S: Postdevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.14 0.00 0.00
5.00 0.32 0.00 0.00
7.50 0.55 0.00 0.02
10.00 0.91 0.07 0.13
12.50 3.71 1.88 1.02
15.00 4.31 2.38 0.31
17.50 4.60 2.64 0.20
20.00 4.81 2.82 0.14
22.50 4.96 2.95 0.12
25.00 5.05 3.03 0.00
27.50 5.05 3.03 0.00
30.00 5.05 3.03 0.00
32.50 5.05 3.03 0.00
35.00 5.05 3.03 0.00
37.50 5.05 3.03 0.00
40.00 5.05 3.03 0.00
42.50 5.05 3.03 0.00
45.00 5.05 3.03 0.00
47.50 5.05 3.03 0.00
50.00 5.05 3.03 0.00
52.50 5.05 3.03 0.00
55.00 5.05 3.03 0.00
57.50 5.05 3.03 0.00
60.00 5.05 3.03 0.00
62.50 5.05 3.03 0.00
65.00 5.05 3.03 0.00
67.50 5.05 3.03 0.00
70.00 5.05 3.03 0.00
72.50 5.05 3.03 0.00
75.00 5.05 3.03 0.00
77.50 5.05 3.03 0.00
80.00 5.05 3.03 0.00
82.50 5.05 3.03 0.00
85.00 5.05 3.03 0.00
87.50 5.05 3.03 0.00
90.00 5.05 3.03 0.00
92.50 5.05 3.03 0.00
95.00 5.05 3.03 0.00
97.50 5.05 3.03 0.00
100.00 5.05 3.03 0.00
102.50 5.05 3.03 0.00
105.00 5.05 3.03 0.00
107.50 5.05 3.03 0.00
110.00 5.05 3.03 0.00
112.50 5.05 3.03 0.00
115.00 5.05 3.03 0.00
117.50 5.05 3.03 0.00
120.00 5.05 3.03 0.00

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 60
Summary for Subcatchment 7S: Predevelolpment Point 2
Runoff = 1.07 cfs @ 12.31 hrs, Volume= 0.123 af, Depth= 1.33"
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 10-Year Rainfall=5.05"
Area (ac) CN Description
1.110 60 Woods, Fair, HSG B
1.110 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 100 0.0093 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
0.4 14 0.0121 0.55 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
32.3 114 Total
Subcatchment 7S: Predevelolpment Point 2
Hydrograph
I I I I I I I
I I I I I I I I ❑Runoff
11.07 cfs 1 1 1 1 I I I I I I 1 1 1
%I rt -1 - 1 -1 - 1I - 1 Type-III
1
,/ 1 1 1 i 1 1 10-rlYar1 Rlainfall=5.05 '
Il
1 1 1 1 1 1 1Runbff Awea=1.110 at
1 1 1 1 1 1 1 1 1 1 1
/ 1 11 I I 1 RunofflVolume=0.123 of
y / 1 1 tu;nOff 11Depth=; 03"
u_
I , 1 1 1 1 RIdwlLength=1114'
,// 1 1 Tc=32.3 min
CN6p
1
1
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)

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 61
Hydrograph for Subcatchment 7S: Predevelolpment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.14 0.00 0.00
5.00 0.32 0.00 0.00
7.50 0.55 0.00 0.00
10.00 0.91 0.00 0.00
12.50 3.71 0.63 0.81
15.00 4.31 0.92 0.10
17.50 4.60 1.08 0.06
20.00 4.81 1.19 0.05
22.50 4.96 1.28 0.04
25.00 5.05 1.33 0.00
27.50 5.05 1.33 0.00
30.00 5.05 1.33 0.00
32.50 5.05 1.33 0.00
35.00 5.05 1.33 0.00
37.50 5.05 1.33 0.00
40.00 5.05 1.33 0.00
42.50 5.05 1.33 0.00
45.00 5.05 1.33 0.00
47.50 5.05 1.33 0.00
50.00 5.05 1.33 0.00
52.50 5.05 1.33 0.00
55.00 5.05 1.33 0.00
57.50 5.05 1.33 0.00
60.00 5.05 1.33 0.00
62.50 5.05 1.33 0.00
65.00 5.05 1.33 0.00
67.50 5.05 1.33 0.00
70.00 5.05 1.33 0.00
72.50 5.05 1.33 0.00
75.00 5.05 1.33 0.00
77.50 5.05 1.33 0.00
80.00 5.05 1.33 0.00
82.50 5.05 1.33 0.00
85.00 5.05 1.33 0.00
87.50 5.05 1.33 0.00
90.00 5.05 1.33 0.00
92.50 5.05 1.33 0.00
95.00 5.05 1.33 0.00
97.50 5.05 1.33 0.00
100.00 5.05 1.33 0.00
102.50 5.05 1.33 0.00
105.00 5.05 1.33 0.00
107.50 5.05 1.33 0.00
110.00 5.05 1.33 0.00
112.50 5.05 1.33 0.00
115.00 5.05 1.33 0.00
117.50 5.05 1.33 0.00
120.00 5.05 1.33 0.00

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 62
Summary for Subcatchment 8S: BYPASS 1
Runoff = 4.68 cfs @ 12.11 hrs, Volume= 0.338 af, Depth= 1.92"
Routed to Link 11 L : POST DEV
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 10-Year Rainfall=5.05"
Area (ac) CN Description
1.180 60 Woods, Fair, HSG B
0.130 73 Woods, Fair, HSG C
0.170 61 >75% Grass cover, Good, HSG B
0.120 74 >75% Grass cover, Good, HSG C
0.310 80 >75% Grass cover, Good, HSG D
0.080 98 Paved parking, HSG B
0.090 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
2.120 68 Weighted Average
1.910 90.09% Pervious Area
0.210 9.91% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) _ (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.8 249 0.0472 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.1 278 0.0398 37.88 454.62 Channel Flow,
Area= 12.0 sf Perim= 7.2' r= 1.67'
n= 0.011 Concrete pipe, straight & clean
17.8 627 Total

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 63
Subcatchment 8S: BYPASS 1
Hydrograph
11 1 1 1 1 1 11 1
517 I I 1 I I 1 I I 1 I I 1 I 1 1 I 1 1 ■Runoff
1 11468cfs I 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1Type II124-hr
1 1 1 1 1 1 I1
41 11 / 1 1 1 1 1 1 1 1 1O Y ar kalnfaII 520-5 -
' 1 I ' 1 I ' 1 1Runbff Awea=2.120 ad
I I I 1 1 I 1 1 I 1 1 I 1 1 I I 1 1
T 1 1- 1 1 T 1 1- -Ru noff Yol-u meO-338-af -
y 3 l I I I I I I lu;ngff,Depth 1.p2,'
' / ' 1 1 ' 1 1 ' 1 1 ' Rlbw Length=627'
u 2�/ '1- — ,/ T 1 T 1 7 1 T I T I— 7 I T I T 7 I -
I I I ' I I I I 1 1 I 1 1 I ITci;=17.18 min
1 1 1 1 1 1 1 ({NL6
1-,
1 1 1 1
- 1 / 1 1 1 1 i 1 1
1io ��i�����1�!!!!!!!!!!!!!!!!!!!!!!!! !/!%!!!!!!!!!!!!!!!!!!!
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)

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 64
Hydrograph for Subcatchment 8S: BYPASS 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.14 0.00 0.00
5.00 0.32 0.00 0.00
7.50 0.55 0.00 0.00
10.00 0.91 0.00 0.00
12.50 3.71 1.03 1.17
15.00 4.31 1.41 0.23
17.50 4.60 1.60 0.15
20.00 4.81 1.74 0.10
22.50 4.96 1.85 0.09
25.00 5.05 1.92 0.00
27.50 5.05 1.92 0.00
30.00 5.05 1.92 0.00
32.50 5.05 1.92 0.00
35.00 5.05 1.92 0.00
37.50 5.05 1.92 0.00
40.00 5.05 1.92 0.00
42.50 5.05 1.92 0.00
45.00 5.05 1.92 0.00
47.50 5.05 1.92 0.00
50.00 5.05 1.92 0.00
52.50 5.05 1.92 0.00
55.00 5.05 1.92 0.00
57.50 5.05 1.92 0.00
60.00 5.05 1.92 0.00
62.50 5.05 1.92 0.00
65.00 5.05 1.92 0.00
67.50 5.05 1.92 0.00
70.00 5.05 1.92 0.00
72.50 5.05 1.92 0.00
75.00 5.05 1.92 0.00
77.50 5.05 1.92 0.00
80.00 5.05 1.92 0.00
82.50 5.05 1.92 0.00
85.00 5.05 1.92 0.00
87.50 5.05 1.92 0.00
90.00 5.05 1.92 0.00
92.50 5.05 1.92 0.00
95.00 5.05 1.92 0.00
97.50 5.05 1.92 0.00
100.00 5.05 1.92 0.00
102.50 5.05 1.92 0.00
105.00 5.05 1.92 0.00
107.50 5.05 1.92 0.00
110.00 5.05 1.92 0.00
112.50 5.05 1.92 0.00
115.00 5.05 1.92 0.00
117.50 5.05 1.92 0.00
120.00 5.05 1.92 0.00

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 65
Summary for Subcatchment 9S: Postdevelopment Point 2
Runoff = 1.05 cfs @ 12.26 hrs, Volume= 0.111 af, Depth= 1.33"
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 10-Year Rainfall=5.05"
Area (ac) CN Description
1.000 60 Woods, Fair, HSG B
1.000 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.5 93 0.0106 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
Subcatchment 9S: Postdevelopment Point 2
Hydrograph
/ I I 11 1 1
I I 1 I I I I I I I I I I I ■Runoff
11.o5 cfs l l I I I I I I I I I I I
1 I I 1 1 I 1Tyrpe-IIr24 1r`
IO.Year, RlainfaII 5.b51
IRunbff Awea=1.000 at
1 , 1 1 , I
Runoff1Volume=0.111 af
1 cu;ncpff pepth=1.,s3�'
FIoW Length 93'
1 I
I Slope=0.0106
Tc=28.5mii
I
% 1 I CN=60
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)

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 66
Hydrograph for Subcatchment 9S: Postdevelopment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.14 0.00 0.00
5.00 0.32 0.00 0.00
7.50 0.55 0.00 0.00
10.00 0.91 0.00 0.00
12.50 3.71 0.63 0.65
15.00 4.31 0.92 0.09
17.50 4.60 1.08 0.06
20.00 4.81 1.19 0.04
22.50 4.96 1.28 0.04
25.00 5.05 1.33 0.00
27.50 5.05 1.33 0.00
30.00 5.05 1.33 0.00
32.50 5.05 1.33 0.00
35.00 5.05 1.33 0.00
37.50 5.05 1.33 0.00
40.00 5.05 1.33 0.00
42.50 5.05 1.33 0.00
45.00 5.05 1.33 0.00
47.50 5.05 1.33 0.00
50.00 5.05 1.33 0.00
52.50 5.05 1.33 0.00
55.00 5.05 1.33 0.00
57.50 5.05 1.33 0.00
60.00 5.05 1.33 0.00
62.50 5.05 1.33 0.00
65.00 5.05 1.33 0.00
67.50 5.05 1.33 0.00
70.00 5.05 1.33 0.00
72.50 5.05 1.33 0.00
75.00 5.05 1.33 0.00
77.50 5.05 1.33 0.00
80.00 5.05 1.33 0.00
82.50 5.05 1.33 0.00
85.00 5.05 1.33 0.00
87.50 5.05 1.33 0.00
90.00 5.05 1.33 0.00
92.50 5.05 1.33 0.00
95.00 5.05 1.33 0.00
97.50 5.05 1.33 0.00
100.00 5.05 1.33 0.00
102.50 5.05 1.33 0.00
105.00 5.05 1.33 0.00
107.50 5.05 1.33 0.00
110.00 5.05 1.33 0.00
112.50 5.05 1.33 0.00
115.00 5.05 1.33 0.00
117.50 5.05 1.33 0.00
120.00 5.05 1.33 0.00

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 67
Summary for Pond 12P: POND
[44] Hint: Outlet device#2 is below defined storage
Inflow Area = 2.340 ac, 48.29% Impervious, Inflow Depth = 3.03" for 10-Year event
Inflow = 12.57 cfs @ 11.96 hrs, Volume= 0.591 af
Outflow = 1.47 cfs @ 12.29 hrs, Volume= 0.591 af, Atten= 88%, Lag= 20.3 min
Primary = 1.47 cfs @ 12.29 hrs, Volume= 0.591 af
Routed to Link 11 L : POST DEV
Secondary= 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to Link 11 L : POST DEV
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 579.63'@ 12.29 hrs Surf.Area= 5,935 sf Storage= 12,438 cf
Plug-Flow detention time=419.4 min calculated for 0.591 af(100% of inflow)
Center-of-Mass det. time=419.9 min ( 1,234.6 - 814.6 )
Volume Invert Avail.Storage Storage Description
#1 577.00' 38,262 cf Custom Stage Data (Prismatic)Listed below(Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
577.00 3,579 0 0
578.00 4,438 4,009 4,009
579.00 5,335 4,887 8,895
580.00 6,289 5,812 14,707
581.00 7,299 6,794 21,501
582.00 8,366 7,833 29,334
583.00 9,490 8,928 38,262
Device Routing Invert Outlet Devices
#1 Primary 575.50' 15.0" Round Culvert
L= 57.4' RCP, rounded edge headwall, Ke= 0.100
Inlet/ Outlet Invert= 575.50'/ 573.63' S= 0.0326 '/' Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf
#2 Device 1 575.50' SAND FILTER
Head (feet) 0.00 1.00 1.50 2.50 3.50 4.50 5.50 6.50
Disch. (cfs) 0.000 0.052 0.060 0.077 0.095 0.112 0.129 0.146
#3 Device 1 578.21' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#4 Device 1 578.89' 15.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1 579.63' 6.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#6 Device 1 580.18' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#7 Device 1 580.80' 2.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32
#8 Device 1 581.00' 3.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 68
#9 Secondary 582.00' 20.0' long x 16.0' breadth EMERGENCY SPILLWAY
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=1.47 cfs @ 12.29 hrs HW=579.63' (Free Discharge)
-1=Culvert (Passes 1.47 cfs of 13.74 cfs potential flow)
-2=SAND FILTER (Custom Controls 0.11 cfs)
-3=Orifice/Grate (Orifice Controls 0.19 cfs @ 5.52 fps)
-4=Orifice/Grate (Orifice Controls 1.18 cfs @ 3.77 fps)
-5=Orifice/Grate ( Controls 0.00 cfs)
-6=Orifice/Grate ( Controls 0.00 cfs)
-7=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
-8=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=577.00' (Free Discharge)
L9=EMERGENCY SPILLWAY( Controls 0.00 cfs)
Pond 12P: POND
Hydrograph
-r -1 -1- - -I -1- 1- t -I -I- -I - I- 1- 1 -1- I- 1- -
- - 1 I 44 -i 4 1 1 + -1 I 14 1 1 44 1 1 4 - ■Inflow
12.57 cfs ❑�UffIOW
i
i L _I - I- L _1 - -I- I 1 L 1�1 - -_ � I- L _ Primary
14_ In IrOW reaZ lac E Secondary
13
12z ' 'r r7 -1 - 1- r7 -1- i T7 1
�Q
- 1- -r 1 1 fi -11 1 + -1 ISto1aUe=1-214381 cf
ill- - / L I 4 -1 - 1- -k -I -1- 1- -1 -I- 1 4 1- J- 45 -1- 1- 4 -
104-z / / z /1 1 I 1 I 1 1 I 1 I 1 1 1 1 1 1 1 1 1 1
9 z , /I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
A $y "1 1 / 1111111111111111111
c - / / - + -1 1- t + 1 1 + - 1 1- 1 1 + + 1 1 + -
LL 6: / z / 1 1_ _t -1 - I- _L _I -I- 1- -1 -I- 1 _t -1 - 1- L _t -I- 1- -
5 / / / /1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
4 / / "I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
3y i t®
2-_ / %///' �r �i ////////////////////////////////////////////////////////////%
,� � //////%%///////////////// /
o 1l�/l/ll/l/l/lll/ll/// /
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)

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 69
Pond 12P: POND
Stage-Discharge
I I I 1 ❑Total
583 ❑Primary
❑Secondary
EMERGENCY SPILLWAY
582 I I �� I
/�// % I 1 1
*/� Broad-Crested Rectangular Weir
Broad-Crested Rectangular Weir I
581 / I
5 Orifice/Grate 1
f I
c 580 / �0 Orifice/Grate I
/ I I I I I
I I
Orifice/Grate
w 1
579 7 1
Orifice/Grate I
578 O% 1 1
i i / / i i i i
/ i i i i
/ / / / i
577 , , , , „ , , „ , , . , (, . . • (. . (. . . .
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Discharge (cfs)
Pond 12P: POND
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 500 1,000 1,500 2,000 2,500 3,000 3,5004,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 0 Surface
. . ' . . . ! . . . ' . . .
. . . ! . . . I . ( . I . . . ! . . . I . . . I . . . 1 , , . I . . . ' . . . 1 . . . I . . . ' . . . ! . . . ❑Storage
583� I I I II I 11 i 1 1 7
I I I II I I I I II /
1 1 1 1 1 1 1 II I I I I I I I
582 I I I ////' II I I I
_ I I I I II I I I I ��/�/
' ,, I I I II I I I
581-
1 z,__a H I_L _L 11 I JH H
11 1 1I 1 I I1 1 I I
a 580- I I I I .. "/ . 1 I II I I I I II I I I
d - — I H + + I + 1 I i+ r 1+ + + II I -[ r +
w - " I I I I I I II I I I
579-"
I I II I I I I II I I I
- n — r r 1- 1 I 1t 1 —Ill — + —1 1— 1 rt r r
578
11 I I I II I I I
/ / /
/
- Custom Stage Data / z / /
577
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000
Storage(cubic-feet)

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 70
Hydrograph for Pond 12P: POND
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 577.00 0.00 0.00 0.00
2.50 0.00 0 577.00 0.00 0.00 0.00
5.00 0.00 0 577.00 0.00 0.00 0.00
7.50 0.02 15 577.00 0.00 0.00 0.00
10.00 0.13 281 577.08 0.06 0.06 0.00
12.50 1.02 12,280 579.60 1.44 1.44 0.00
15.00 0.31 8,955 579.01 0.40 0.40 0.00
17.50 0.20 8,441 578.91 0.24 0.24 0.00
20.00 0.14 7,996 578.83 0.21 0.21 0.00
22.50 0.12 7,358 578.70 0.19 0.19 0.00
25.00 0.00 6,416 578.52 0.16 0.16 0.00
27.50 0.00 5,286 578.28 0.09 0.09 0.00
30.00 0.00 4,547 578.12 0.08 0.08 0.00
32.50 0.00 3,847 577.96 0.08 0.08 0.00
35.00 0.00 3,172 577.81 0.07 0.07 0.00
37.50 0.00 2,520 577.65 0.07 0.07 0.00
40.00 0.00 1,892 577.50 0.07 0.07 0.00
42.50 0.00 1,287 577.35 0.07 0.07 0.00
45.00 0.00 706 577.19 0.06 0.06 0.00
47.50 0.00 158 577.04 0.04 0.04 0.00
50.00 0.00 12 577.00 0.00 0.00 0.00
52.50 0.00 1 577.00 0.00 0.00 0.00
55.00 0.00 0 577.00 0.00 0.00 0.00
57.50 0.00 0 577.00 0.00 0.00 0.00
60.00 0.00 0 577.00 0.00 0.00 0.00
62.50 0.00 0 577.00 0.00 0.00 0.00
65.00 0.00 0 577.00 0.00 0.00 0.00
67.50 0.00 0 577.00 0.00 0.00 0.00
70.00 0.00 0 577.00 0.00 0.00 0.00
72.50 0.00 0 577.00 0.00 0.00 0.00
75.00 0.00 0 577.00 0.00 0.00 0.00
77.50 0.00 0 577.00 0.00 0.00 0.00
80.00 0.00 0 577.00 0.00 0.00 0.00
82.50 0.00 0 577.00 0.00 0.00 0.00
85.00 0.00 0 577.00 0.00 0.00 0.00
87.50 0.00 0 577.00 0.00 0.00 0.00
90.00 0.00 0 577.00 0.00 0.00 0.00
92.50 0.00 0 577.00 0.00 0.00 0.00
95.00 0.00 0 577.00 0.00 0.00 0.00
97.50 0.00 0 577.00 0.00 0.00 0.00
100.00 0.00 0 577.00 0.00 0.00 0.00
102.50 0.00 0 577.00 0.00 0.00 0.00
105.00 0.00 0 577.00 0.00 0.00 0.00
107.50 0.00 0 577.00 0.00 0.00 0.00
110.00 0.00 0 577.00 0.00 0.00 0.00
112.50 0.00 0 577.00 0.00 0.00 0.00
115.00 0.00 0 577.00 0.00 0.00 0.00
117.50 0.00 0 577.00 0.00 0.00 0.00
120.00 0.00 0 577.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 71
Stage-Discharge for Pond 12P: POND
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
577.00 0.00 0.00 0.00 582.20 21.86 17.06 4.79
577.10 0.06 0.06 0.00 582.30 26.02 17.18 8.84
577.20 0.06 0.06 0.00 582.40 30.96 17.29 13.66
577.30 0.07 0.07 0.00 582.50 36.50 17.41 19.09
577.40 0.07 0.07 0.00 582.60 42.62 17.52 25.10
577.50 0.07 0.07 0.00 582.70 48.91 17.64 31.27
577.60 0.07 0.07 0.00 582.80 55.53 17.75 37.78
577.70 0.07 0.07 0.00 582.90 62.86 17.86 45.00
577.80 0.07 0.07 0.00 583.00 70.57 17.97 52.60
577.90 0.08 0.08 0.00
578.00 0.08 0.08 0.00
578.10 0.08 0.08 0.00
578.20 0.08 0.08 0.00
578.30 0.10 0.10 0.00
578.40 0.13 0.13 0.00
578.50 0.16 0.16 0.00
578.60 0.18 0.18 0.00
578.70 0.19 0.19 0.00
578.80 0.21 0.21 0.00
578.90 0.22 0.22 0.00
579.00 0.38 0.38 0.00
579.10 0.63 0.63 0.00
579.20 0.89 0.89 0.00
579.30 1.06 1.06 0.00
579.40 1.20 1.20 0.00
579.50 1.33 1.33 0.00
579.60 1.44 1.44 0.00
579.70 1.57 1.57 0.00
579.80 1.75 1.75 0.00
579.90 1.95 1.95 0.00
580.00 2.11 2.11 0.00
580.10 2.25 2.25 0.00
580.20 2.38 2.38 0.00
580.30 2.54 2.54 0.00
580.40 2.74 2.74 0.00
580.50 2.97 2.97 0.00
580.60 3.21 3.21 0.00
580.70 3.41 3.41 0.00
580.80 3.58 3.58 0.00
580.90 4.46 4.46 0.00
581.00 5.91 5.91 0.00
581.10 8.87 8.87 0.00
581.20 13.10 13.10 0.00
581.30 15.98 15.98 0.00
581.40 16.10 16.10 0.00
581.50 16.23 16.23 0.00
581.60 16.35 16.35 0.00
581.70 16.47 16.47 0.00
581.80 16.59 16.59 0.00
581.90 16.71 16.71 0.00
582.00 16.83 16.83 0.00
582.10 18.64 16.95 1.69

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 72
Stage-Area-Storage for Pond 12P: POND
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
577.00 3,579 0 582.20 8,591 31,029
577.10 3,665 362 582.30 8,703 31,894
577.20 3,751 733 582.40 8,816 32,770
577.30 3,837 1,112 582.50 8,928 33,657
577.40 3,923 1,500 582.60 9,040 34,555
577.50 4,009 1,897 582.70 9,153 35,465
577.60 4,094 2,302 582.80 9,265 36,386
577.70 4,180 2,716 582.90 9,378 37,318
577.80 4,266 3,138 583.00 9,490 38,262
577.90 4,352 3,569
578.00 4,438 4,009
578.10 4,528 4,457
578.20 4,617 4,914
578.30 4,707 5,380
578.40 4,797 5,855
578.50 4,887 6,340
578.60 4,976 6,833
578.70 5,066 7,335
578.80 5,156 7,846
578.90 5,245 8,366
579.00 5,335 8,895
579.10 5,430 9,433
579.20 5,526 9,981
579.30 5,621 10,538
579.40 5,717 11,105
579.50 5,812 11,682
579.60 5,907 12,268
579.70 6,003 12,863
579.80 6,098 13,468
579.90 6,194 14,083
580.00 6,289 14,707
580.10 6,390 15,341
580.20 6,491 15,985
580.30 6,592 16,639
580.40 6,693 17,303
580.50 6,794 17,978
580.60 6,895 18,662
580.70 6,996 19,357
580.80 7,097 20,061
580.90 7,198 20,776
581.00 7,299 21,501
581.10 7,406 22,236
581.20 7,512 22,982
581.30 7,619 23,739
581.40 7,726 24,506
581.50 7,833 25,284
581.60 7,939 26,072
581.70 8,046 26,872
581.80 8,153 27,682
581.90 8,259 28,502
582.00 8,366 29,334
582.10 8,478 30,176

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 73
Summary for Link 6L: PRE DEV
Inflow Area = 4.340 ac, 4.61% Impervious, Inflow Depth = 1.69" for 10-Year event
Inflow = 6.26 cfs @ 12.24 hrs, Volume= 0.610 af
Primary = 6.26 cfs @ 12.24 hrs, Volume= 0.610 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 6L: PRE DEV
Hydrograph
7-/-71 I 1
1 1 1 1
1 1 1
1 I ❑Inflow `
- 1626 cfs I I _0 Primary 1
'62 j 1 I IlnflowlArea=4.340lac
6 / 1 1 1 1 1 1 1 1 1 1
/ 1
1 i 1
1 1 1 1
1 1 1
1 I I I I1 1
/ T T — 1— T —I — T T —1— T 1 T 1 — T I 1— 1- —11— T —1
I 1 11 11 I I I I I I I I 1 I
4 / 1 1 1 1 1 1 I I I 1 1
33 / 1 1 1 1 1 1 I I1 11 1 1 1 1 1 1 11 11 -I -1- 4 —I — I— -1 — HI
-1— -1 - 1— -L1 1 1 I I I I
2 1 1 1 1 1 1 1 1 I I I I
7 717 T 717 1 7 —1— r 1— T —' — 1 7 717 T 7171
1 1 1 1 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)

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 74
Hydrograph for Link 6L: PRE DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.00 0.00 0.00
10.00 0.00 0.00 0.00
12.50 3.51 0.00 3.51
15.00 0.44 0.00 0.44
17.50 0.28 0.00 0.28
20.00 0.20 0.00 0.20
22.50 0.17 0.00 0.17
25.00 0.00 0.00 0.00
27.50 0.00 0.00 0.00
30.00 0.00 0.00 0.00
32.50 0.00 0.00 0.00
35.00 0.00 0.00 0.00
37.50 0.00 0.00 0.00
40.00 0.00 0.00 0.00
42.50 0.00 0.00 0.00
45.00 0.00 0.00 0.00
47.50 0.00 0.00 0.00
50.00 0.00 0.00 0.00
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 75
Summary for Link 11 L: POST DEV
Inflow Area = 4.460 ac, 30.04% Impervious, Inflow Depth = 2.50" for 10-Year event
Inflow = 6.12 cfs @ 12.11 hrs, Volume= 0.929 of
Primary = 6.12 cfs @ 12.11 hrs, Volume= 0.929 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 11 L: POST DEV
Hydrograph
I I I I 1 1 1 1 1
I I 1 I 1 I 1 I 1 I I I ❑Inflow `
J 6.12 cfs I L _ T I I— I I - I— 4 —I -0 Primary
16.,/fs r/ I 1 I 1 1 Inflow 1Area=4.46O lac
6 1 1 1 1 1 " 1 " I I I I 1 1
T T — I— T —1 — T -1 —1— T I I— T - I— T —1
5 1 1 1 1 1 I I I I 1 1
1 1 1 I I I I I I 1 1
1 1 1 1 I I I I 1 1
N 4 1 1 1 1 I I I I 1 1
L L _ I_ 1 _I _ L _ 1 _1_ L _I _ 1_ 1 _I _
o 9 1 1 1 1 1 1 1 1
LL 3 ' 1 I 1 1 I I
T —
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)

54647 - Drainage_Pre-Post Type II 24-hr 10-Year Rainfall=5.05"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 76
Hydrograph for Link 11 L: POST DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.00 0.00 0.00
10.00 0.06 0.00 0.06
12.50 2.61 0.00 2.61
15.00 0.63 0.00 0.63
17.50 0.38 0.00 0.38
20.00 0.31 0.00 0.31
22.50 0.28 0.00 0.28
25.00 0.16 0.00 0.16
27.50 0.09 0.00 0.09
30.00 0.08 0.00 0.08
32.50 0.08 0.00 0.08
35.00 0.07 0.00 0.07
37.50 0.07 0.00 0.07
40.00 0.07 0.00 0.07
42.50 0.07 0.00 0.07
45.00 0.06 0.00 0.06
47.50 0.04 0.00 0.04
50.00 0.00 0.00 0.00
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 77
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment3S: PredevelopmentPoint 1 Runoff Area=4.340 ac 4.61% Impervious Runoff Depth=2.35"
Flow Length=624' Tc=27.8 min CN=65 Runoff=8.98 cfs 0.850 af
Subcatchment4S: PostdevelopmentPoint Runoff Area=2.340 ac 48.29% Impervious Runoff Depth=3.88"
Tc=5.0 min CN=81 Runoff=15.94 cfs 0.757 af
Subcatchment7S: PredevelolpmentPoint 2 Runoff Area=1.110 ac 0.00% Impervious Runoff Depth=1.92"
Flow Length=114' Tc=32.3 min CN=60 Runoff=1.63 cfs 0.178 af
Subcatchment8S: BYPASS 1 Runoff Area=2.120 ac 9.91% Impervious Runoff Depth=2.62"
Flow Length=627' Tc=17.8 min CN=68 Runoff=6.50 cfs 0.463 af
Subcatchment9S: PostdevelopmentPoint 2 Runoff Area=1.000 ac 0.00% Impervious Runoff Depth=1.92"
Flow Length=93' Slope=0.0106 '/' Tc=28.5 min CN=60 Runoff=1.60 cfs 0.160 af
Pond 12P: POND Peak Elev=580.18' Storage=15,852 cf Inflow=15.94 cfs 0.757 af
Primary=2.35 cfs 0.757 af Secondary=0.00 cfs 0.000 af Outflow=2.35 cfs 0.757 af
Link 6L: PRE DEV Inflow=8.98 cfs 0.850 af
Primary=8.98 cfs 0.850 af
Link 11 L: POST DEV Inflow=8.84 cfs 1.220 af
Primary=8.84 cfs 1.220 af
Total Runoff Area = 10.910 ac Runoff Volume = 2.409 af Average Runoff Depth = 2.65"
85.88% Pervious = 9.370 ac 14.12% Impervious = 1.540 ac

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 78
Summary for Subcatchment 3S: Predevelopment Point 1
[47] Hint: Peak is 668% of capacity of segment#3
Runoff = 8.98 cfs @ 12.23 hrs, Volume= 0.850 af, Depth= 2.35"
Routed to Link 6L : PRE DEV
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 25-Year Rainfall=6.00"
Area (ac) CN Description
3.070 60 Woods, Fair, HSG B
0.320 73 Woods, Fair, HSG C
0.200 79 Woods, Fair, HSG D
0.120 56 Brush, Fair, HSG B
0.080 70 Brush, Fair, HSG C
0.350 77 Brush, Fair, HSG D
0.100 98 Paved parking, HSG B
0.060 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
4.340 65 Weighted Average
4.140 95.39% Pervious Area
0.200 4.61% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.9 254 0.0477 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
10.0 270 0.0391 0.45 1.34 Channel Flow, CHANNEL
Area= 3.0 sf Perim= 6.3' r= 0.48'
n= 0.400 Sheet flow: Woods+light brush
27.8 624 Total

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 79
Subcatchment 3S: Predevelopment Point 1
Hydrograph
A- -r - 1- rt -1- , 1 - 1- -I 1 1 , - r -1 - 1 rt - 1- 1 - -r -1 - I- -
10 1 1 1 I I 1 I I 1 1 I I 1 1 1 1 1 I 1 1 ■Runoff
/— i 8.98 cfs -r 1- 1 7 T T 1 7 I- - T I- -
9� I I I I I I I I I I I I ITyrpe lli 24-hr
81/ i I I I --1 -.ear RainfaIIT6.b0l
7- 1 I I I Ru nbf Awes=4.340 ad
- / 1 1 1 1 1 1 1 1 1 },1 11 1 1 1 1
1 1 1 1 IRuTno flrVolunlle-0.850 a# -
w 6_ / *tin 1 Depth ` 5�" -
51 '/ I I I I I
io : 4- / 1 1 I I I 1 F_IOw'Length=-624' -
41-' / 1 I I I I I I 1 1
T
I / 1 1 1 1 'Tc=27.88 min -
31 �/ NL6
21/ 1 1 I I I 1 1
11/
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)

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 80
Hydrograph for Subcatchment 3S: Predevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.17 0.00 0.00
5.00 0.38 0.00 0.00
7.50 0.66 0.00 0.00
10.00 1.09 0.00 0.00
12.50 4.41 1.27 4.89
15.00 5.12 1.73 0.58
17.50 5.47 1.97 0.37
20.00 5.71 2.14 0.26
22.50 5.90 2.28 0.23
25.00 6.00 2.35 0.00
27.50 6.00 2.35 0.00
30.00 6.00 2.35 0.00
32.50 6.00 2.35 0.00
35.00 6.00 2.35 0.00
37.50 6.00 2.35 0.00
40.00 6.00 2.35 0.00
42.50 6.00 2.35 0.00
45.00 6.00 2.35 0.00
47.50 6.00 2.35 0.00
50.00 6.00 2.35 0.00
52.50 6.00 2.35 0.00
55.00 6.00 2.35 0.00
57.50 6.00 2.35 0.00
60.00 6.00 2.35 0.00
62.50 6.00 2.35 0.00
65.00 6.00 2.35 0.00
67.50 6.00 2.35 0.00
70.00 6.00 2.35 0.00
72.50 6.00 2.35 0.00
75.00 6.00 2.35 0.00
77.50 6.00 2.35 0.00
80.00 6.00 2.35 0.00
82.50 6.00 2.35 0.00
85.00 6.00 2.35 0.00
87.50 6.00 2.35 0.00
90.00 6.00 2.35 0.00
92.50 6.00 2.35 0.00
95.00 6.00 2.35 0.00
97.50 6.00 2.35 0.00
100.00 6.00 2.35 0.00
102.50 6.00 2.35 0.00
105.00 6.00 2.35 0.00
107.50 6.00 2.35 0.00
110.00 6.00 2.35 0.00
112.50 6.00 2.35 0.00
115.00 6.00 2.35 0.00
117.50 6.00 2.35 0.00
120.00 6.00 2.35 0.00

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 81
Summary for Subcatchment 4S: Postdevelopment Point 1
[49] Hint: Tc<2dt may require smaller dt
Runoff = 15.94 cfs @ 11.95 hrs, Volume= 0.757 af, Depth= 3.88"
Routed to Pond 12P : POND
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 25-Year Rainfall=6.00"
Area (ac) CN Description
0.850 61 >75% Grass cover, Good, HSG B
0.010 74 >75% Grass cover, Good, HSG C
0.240 80 >75% Grass cover, Good, HSG D
1.000 98 Paved parking, HSG B
0.130 98 Paved parking, HSG C
0.110 60 Woods, Fair, HSG B
2.340 81 Weighted Average
1.210 51.71% Pervious Area
1.130 48.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, DIRECT
Subcatchment 4S: Postdevelopment Point 1
Hydrograph
1 1 1 1 I I I I I I I I I 11 1
I 1 I I I I I I I I I I I I I I I I I I ■Runoff
171-/
EMI T —I— T -1 — T7 — I— T —I— T —I— T -1 — T — IT —II— Tn-11 — T
16� — -I — —I — I— rt —I— fi —I— 1— —I — rt — 17T y1""-1 EL F
15� H -1 — H — I— —1— T —I— 1 — H — 1— -I- t -b- —
14 � / •I — � � — I— —I— —I— 4u-7 Lear ��inf�ll 6 �� _
134-/ H 1 — — I— _L —I— T —I— Rim off Area.1 4,
124-/ 1 — L J — I— L —I— L _I L _I — L II—...,�1',�—I— L C—I'— L —
11� -1 I I 1 1 I IRu�ff_V_o rneQ.Z5�7_af
y 10 _ D pI h
3 _ I 1 I 1 1 I I 1 T '1mY 1 1"°1
Ek
7y 1 1 1 I I I I I I I I I I I I I
6�
I I 1 I 1 1 I I 1 1 I I 1 1 I Cl�l 81
— T — T I — I— 7 I— T —I T I T T T I T I T
5 r r 1— r T 1 r r rt T 1— r
4 — � t 1 r I t -1 T I T -1 1— T 1— r —
3 — + I r 7 1— 4 —I T 1 T —1 — I— I— T —1 —
2 1 1— I— 4 —1 T —1— T —1 — — I— — T —1 —
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)

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 82
Hydrograph for Subcatchment 4S: Postdevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.17 0.00 0.00
5.00 0.38 0.00 0.00
7.50 0.66 0.01 0.04
10.00 1.09 0.13 0.20
12.50 4.41 2.47 1.27
15.00 5.12 3.09 0.38
17.50 5.47 3.40 0.25
20.00 5.71 3.62 0.17
22.50 5.90 3.79 0.15
25.00 6.00 3.88 0.00
27.50 6.00 3.88 0.00
30.00 6.00 3.88 0.00
32.50 6.00 3.88 0.00
35.00 6.00 3.88 0.00
37.50 6.00 3.88 0.00
40.00 6.00 3.88 0.00
42.50 6.00 3.88 0.00
45.00 6.00 3.88 0.00
47.50 6.00 3.88 0.00
50.00 6.00 3.88 0.00
52.50 6.00 3.88 0.00
55.00 6.00 3.88 0.00
57.50 6.00 3.88 0.00
60.00 6.00 3.88 0.00
62.50 6.00 3.88 0.00
65.00 6.00 3.88 0.00
67.50 6.00 3.88 0.00
70.00 6.00 3.88 0.00
72.50 6.00 3.88 0.00
75.00 6.00 3.88 0.00
77.50 6.00 3.88 0.00
80.00 6.00 3.88 0.00
82.50 6.00 3.88 0.00
85.00 6.00 3.88 0.00
87.50 6.00 3.88 0.00
90.00 6.00 3.88 0.00
92.50 6.00 3.88 0.00
95.00 6.00 3.88 0.00
97.50 6.00 3.88 0.00
100.00 6.00 3.88 0.00
102.50 6.00 3.88 0.00
105.00 6.00 3.88 0.00
107.50 6.00 3.88 0.00
110.00 6.00 3.88 0.00
112.50 6.00 3.88 0.00
115.00 6.00 3.88 0.00
117.50 6.00 3.88 0.00
120.00 6.00 3.88 0.00

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 83
Summary for Subcatchment 7S: Predevelolpment Point 2
Runoff = 1.63 cfs @ 12.30 hrs, Volume= 0.178 af, Depth= 1.92"
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 25-Year Rainfall=6.00"
Area (ac) CN Description
1.110 60 Woods, Fair, HSG B
1.110 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 100 0.0093 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
0.4 14 0.0121 0.55 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
32.3 114 Total
Subcatchment 7S: Predevelolpment Point 2
Hydrograph
I I I I I I
1 I I I I 1 I I ❑Runoff
1 1 s3 cfs 1 1 i 1 1 I I I I I I I I I I I
1 I 1 1 I I 1 1 I IType Ili 24-hr
/ 1 i 1 i I 1 I 45-Year, Rlainfall=6.b0�'
/ I I -
1 ' I 1 ' 'Runbff Awea=1.110 at
/ I 1 I I 1 I IIIII I 1 1
1 I I 1 Runoff Volume=0.178 of
1 / 11 Itu;nCff 11Depth=1.p2l'
/ ' 1 I FIdwlLength=1114'
/ Tc=32.3 min
/ CN6p
,%iiiiz ,, ii ,
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)

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 84
Hydrograph for Subcatchment 7S: Predevelolpment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.17 0.00 0.00
5.00 0.38 0.00 0.00
7.50 0.66 0.00 0.00
10.00 1.09 0.00 0.00
12.50 4.41 0.97 1.19
15.00 5.12 1.37 0.13
17.50 5.47 1.58 0.08
20.00 5.71 1.74 0.06
22.50 5.90 1.85 0.05
25.00 6.00 1.92 0.00
27.50 6.00 1.92 0.00
30.00 6.00 1.92 0.00
32.50 6.00 1.92 0.00
35.00 6.00 1.92 0.00
37.50 6.00 1.92 0.00
40.00 6.00 1.92 0.00
42.50 6.00 1.92 0.00
45.00 6.00 1.92 0.00
47.50 6.00 1.92 0.00
50.00 6.00 1.92 0.00
52.50 6.00 1.92 0.00
55.00 6.00 1.92 0.00
57.50 6.00 1.92 0.00
60.00 6.00 1.92 0.00
62.50 6.00 1.92 0.00
65.00 6.00 1.92 0.00
67.50 6.00 1.92 0.00
70.00 6.00 1.92 0.00
72.50 6.00 1.92 0.00
75.00 6.00 1.92 0.00
77.50 6.00 1.92 0.00
80.00 6.00 1.92 0.00
82.50 6.00 1.92 0.00
85.00 6.00 1.92 0.00
87.50 6.00 1.92 0.00
90.00 6.00 1.92 0.00
92.50 6.00 1.92 0.00
95.00 6.00 1.92 0.00
97.50 6.00 1.92 0.00
100.00 6.00 1.92 0.00
102.50 6.00 1.92 0.00
105.00 6.00 1.92 0.00
107.50 6.00 1.92 0.00
110.00 6.00 1.92 0.00
112.50 6.00 1.92 0.00
115.00 6.00 1.92 0.00
117.50 6.00 1.92 0.00
120.00 6.00 1.92 0.00

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 85
Summary for Subcatchment 8S: BYPASS 1
Runoff = 6.50 cfs @ 12.11 hrs, Volume= 0.463 af, Depth= 2.62"
Routed to Link 11 L : POST DEV
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 25-Year Rainfall=6.00"
Area (ac) CN Description
1.180 60 Woods, Fair, HSG B
0.130 73 Woods, Fair, HSG C
0.170 61 >75% Grass cover, Good, HSG B
0.120 74 >75% Grass cover, Good, HSG C
0.310 80 >75% Grass cover, Good, HSG D
0.080 98 Paved parking, HSG B
0.090 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
2.120 68 Weighted Average
1.910 90.09% Pervious Area
0.210 9.91% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) _ (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.8 249 0.0472 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.1 278 0.0398 37.88 454.62 Channel Flow,
Area= 12.0 sf Perim= 7.2' r= 1.67'
n= 0.011 Concrete pipe, straight & clean
17.8 627 Total

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 86
Subcatchment 8S: BYPASS 1
Hydrograph
/f I I I I I 1 I I I -
7:./ I I I 1 I I 1 I I 1 1 ' I 1 1 ■Runoff
II 6.50 cfs 11 I I 1 I I 1 ' I 1 1 I 1 1
J 2 L -1 - 1— _i -1- 1 -1— L Type-I1-24-iK -
6- 1 1 1 1 1 1 1 5.Year1I��ainfallT6.p0�'
I I I I I I I I I I
� 1 rt 1 fi 1 1 I I T 1 fi 1 'Runbff�Awea=2 1-20 arc -
5- 1 I I I 1 I I 1 1 I 1 1 I 1 1 I I 1 1
1 I 1 I I 1 Runoff Volumle0.463 of
4� 1 / 1 I Ou;ngff 11Depih42.1,62�'
1
o - J— _ ,/ L —1 — 1_ _i _1_ 1 —1— L —I — 1_ _i _Rdw ten t�1=6271 -
LL 3� 1 1 1 1 1 1 1 1 1 g 1 1 1
' 1 1 1 1 1 1 1 1 ' Tc=17.18 min
1 -1 - 1- -r -1- T —1— T —1 — 1 —i — 1— [�A'�—
2- 1 1 1 1 1 1 1 1 1 �f'Y 16
1 1 1 1 1 1 1 1 I I I I I I
1 1 ' ' 1 ' 1 1 1
1_ 1
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)

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 87
Hydrograph for Subcatchment 8S: BYPASS 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.17 0.00 0.00
5.00 0.38 0.00 0.00
7.50 0.66 0.00 0.00
10.00 1.09 0.00 0.02
12.50 4.41 1.47 1.56
15.00 5.12 1.97 0.29
17.50 5.47 2.22 0.19
20.00 5.71 2.40 0.13
22.50 5.90 2.54 0.12
25.00 6.00 2.62 0.00
27.50 6.00 2.62 0.00
30.00 6.00 2.62 0.00
32.50 6.00 2.62 0.00
35.00 6.00 2.62 0.00
37.50 6.00 2.62 0.00
40.00 6.00 2.62 0.00
42.50 6.00 2.62 0.00
45.00 6.00 2.62 0.00
47.50 6.00 2.62 0.00
50.00 6.00 2.62 0.00
52.50 6.00 2.62 0.00
55.00 6.00 2.62 0.00
57.50 6.00 2.62 0.00
60.00 6.00 2.62 0.00
62.50 6.00 2.62 0.00
65.00 6.00 2.62 0.00
67.50 6.00 2.62 0.00
70.00 6.00 2.62 0.00
72.50 6.00 2.62 0.00
75.00 6.00 2.62 0.00
77.50 6.00 2.62 0.00
80.00 6.00 2.62 0.00
82.50 6.00 2.62 0.00
85.00 6.00 2.62 0.00
87.50 6.00 2.62 0.00
90.00 6.00 2.62 0.00
92.50 6.00 2.62 0.00
95.00 6.00 2.62 0.00
97.50 6.00 2.62 0.00
100.00 6.00 2.62 0.00
102.50 6.00 2.62 0.00
105.00 6.00 2.62 0.00
107.50 6.00 2.62 0.00
110.00 6.00 2.62 0.00
112.50 6.00 2.62 0.00
115.00 6.00 2.62 0.00
117.50 6.00 2.62 0.00
120.00 6.00 2.62 0.00

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 88
Summary for Subcatchment 9S: Postdevelopment Point 2
Runoff = 1.60 cfs @ 12.25 hrs, Volume= 0.160 af, Depth= 1.92"
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 25-Year Rainfall=6.00"
Area (ac) CN Description
1.000 60 Woods, Fair, HSG B
1.000 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.5 93 0.0106 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
Subcatchment 9S: Postdevelopment Point 2
Hydrograph
/ II I I I I I I I
I I I I I I I I I I ❑Runoff
11.6o cfsl I I I I I I I I I I
1 I I I I I I I 1 Type II 24-hr
1 I 1 i I 1 I 5-rlYear1 R1lainfalIT6.00 '
1 I I 1 I I 1 I IRunbff Area=1.000 at
, 1 1 1 1 1 1 1 1 1 1
L ✓ 1 1 Runoff 1 Vo l u mle=0.169_af
,11 / 1I u;ngff,Depth=1.021'
LL 1 Im IFlow Length=93'
1 I 1 1 Slope=0.0106 '/'
11 1 1 Tc=28.5 mi 1n
1 1 1 1'
1 1 1 CN=60
1 1 1
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)

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 89
Hydrograph for Subcatchment 9S: Postdevelopment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.17 0.00 0.00
5.00 0.38 0.00 0.00
7.50 0.66 0.00 0.00
10.00 1.09 0.00 0.00
12.50 4.41 0.97 0.95
15.00 5.12 1.37 0.12
17.50 5.47 1.58 0.08
20.00 5.71 1.74 0.05
22.50 5.90 1.85 0.05
25.00 6.00 1.92 0.00
27.50 6.00 1.92 0.00
30.00 6.00 1.92 0.00
32.50 6.00 1.92 0.00
35.00 6.00 1.92 0.00
37.50 6.00 1.92 0.00
40.00 6.00 1.92 0.00
42.50 6.00 1.92 0.00
45.00 6.00 1.92 0.00
47.50 6.00 1.92 0.00
50.00 6.00 1.92 0.00
52.50 6.00 1.92 0.00
55.00 6.00 1.92 0.00
57.50 6.00 1.92 0.00
60.00 6.00 1.92 0.00
62.50 6.00 1.92 0.00
65.00 6.00 1.92 0.00
67.50 6.00 1.92 0.00
70.00 6.00 1.92 0.00
72.50 6.00 1.92 0.00
75.00 6.00 1.92 0.00
77.50 6.00 1.92 0.00
80.00 6.00 1.92 0.00
82.50 6.00 1.92 0.00
85.00 6.00 1.92 0.00
87.50 6.00 1.92 0.00
90.00 6.00 1.92 0.00
92.50 6.00 1.92 0.00
95.00 6.00 1.92 0.00
97.50 6.00 1.92 0.00
100.00 6.00 1.92 0.00
102.50 6.00 1.92 0.00
105.00 6.00 1.92 0.00
107.50 6.00 1.92 0.00
110.00 6.00 1.92 0.00
112.50 6.00 1.92 0.00
115.00 6.00 1.92 0.00
117.50 6.00 1.92 0.00
120.00 6.00 1.92 0.00

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 90
Summary for Pond 12P: POND
[44] Hint: Outlet device#2 is below defined storage
Inflow Area = 2.340 ac, 48.29% Impervious, Inflow Depth = 3.88" for 25-Year event
Inflow = 15.94 cfs @ 11.95 hrs, Volume= 0.757 af
Outflow = 2.35 cfs @ 12.17 hrs, Volume= 0.757 af, Atten= 85%, Lag= 13.0 min
Primary = 2.35 cfs @ 12.17 hrs, Volume= 0.757 af
Routed to Link 11 L : POST DEV
Secondary= 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to Link 11 L : POST DEV
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 580.18'@ 12.17 hrs Surf.Area= 6,470 sf Storage= 15,852 cf
Plug-Flow detention time=355.3 min calculated for 0.757 af(100% of inflow)
Center-of-Mass det. time= 355.9 min ( 1,163.4 - 807.6 )
Volume Invert Avail.Storage Storage Description
#1 577.00' 38,262 cf Custom Stage Data (Prismatic)Listed below(Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
577.00 3,579 0 0
578.00 4,438 4,009 4,009
579.00 5,335 4,887 8,895
580.00 6,289 5,812 14,707
581.00 7,299 6,794 21,501
582.00 8,366 7,833 29,334
583.00 9,490 8,928 38,262
Device Routing Invert Outlet Devices
#1 Primary 575.50' 15.0" Round Culvert
L= 57.4' RCP, rounded edge headwall, Ke= 0.100
Inlet/ Outlet Invert= 575.50'/ 573.63' S= 0.0326 '/' Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf
#2 Device 1 575.50' SAND FILTER
Head (feet) 0.00 1.00 1.50 2.50 3.50 4.50 5.50 6.50
Disch. (cfs) 0.000 0.052 0.060 0.077 0.095 0.112 0.129 0.146
#3 Device 1 578.21' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#4 Device 1 578.89' 15.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1 579.63' 6.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#6 Device 1 580.18' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#7 Device 1 580.80' 2.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32
#8 Device 1 581.00' 3.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 91
#9 Secondary 582.00' 20.0' long x 16.0' breadth EMERGENCY SPILLWAY
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=2.35 cfs @ 12.17 hrs HW=580.18' (Free Discharge)
-1=Culvert (Passes 2.35 cfs of 14.51 cfs potential flow)
-2=SAND FILTER (Custom Controls 0.12 cfs)
-3=Orifice/Grate (Orifice Controls 0.22 cfs @ 6.57 fps)
-4=Orifice/Grate (Orifice Controls 1.62 cfs @ 5.19 fps)
-5=Orifice/Grate (Orifice Controls 0.39 cfs @ 3.12 fps)
-6=Orifice/Grate ( Controls 0.00 cfs)
-7=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
-8=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=577.00' (Free Discharge)
4-9=EMERGENCY SPILLWAY( Controls 0.00 cfs)
Pond 12P: POND
Hydrograph
I IIII I
III I II I III I III
I I I I I I I I I I •Inflow
/I I resa cfs(I /�.I. OutflowD
_ / /• / /1 I I 1 1 1 1 1 i I Area 2 34O ac ❑Secondary
174-"' , I POQ 0Is080 J� -
G T 16 ' i z• ,I I I I I I I I I I In I I I
15 , 1 1 1 1 1 1 1 IS T"��-�-1-5 8�-If -
14 , I 1 1 1 1 1 1 1 1 1 1 I I� 1 h 1 1 1
134-/ i 1 -I - I- LI -I- I- 1 _I -1- I- 1 -I - I- 1L -I- I- L -
,
11� / _f - 1_ _1 1 1 L _I 1 1 LH _1 1 H 1 1 1 1 _1 1 1 L -
- 4 I- 1- -1 -1 - I- L -1 -1- 1- -H -1 -1- H L -1 - 1- 1- -1 -I- 1- -H -
w 10 ' , ' /
3 $� / - + I- 1- 4 -I - I- -h H -1- I- + -1 -I- H 4 -I - I- '4 4 -1- I- ± -
LL 7 / , , - H 1 HI -
6 , / / /- t 1- HH -1 - 1- tH -1- 1- + -1 -1- Ht -1 - 1- ' -1 -1- 1- t -
5� / / / r.3e as 1 r -r 1 1 fi - 1 1 t - 1 1 fi 1 1 r- -r 1 1 fi -
4=' / • / 2.35 cfs !�//• 1
3� / %//////%//////////////////////////////////////////////////////////////////////%
? / %///i %/%//////////////////////////////////////////////////////////////////////////////%
I o° ' // / / ,/
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)

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 92
Pond 12P: POND
Stage-Discharge
I I I I ❑Total
583 ❑Primary
❑Secondary
EMERGENCY SPILLWAY
582 I I 4 I
/�// % I 1
*/� Broad-Crested Rectangular Weir
Broad-Crested Rectangular Weir I
581 o / I I
5 Orifice/Grate I
I
c 580 �- /0 Orifice/Grate I
/ I I I I I
Orifice/Grate
w 1
579 7 1
Orifice/Grate I
578 O% 1 1
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Discharge (cfs)
Pond 12P: POND
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 500 1,000 1,500 2,000 2,500 3,000 3,5004,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 0 Surface
. . ' . . . ! . . . ' . . .
. . . ! . . . I . ( . I . . . ! . . . I . . . I . . . 1 , , . I . . . ' . . . 1 . . . I . . . ' . . . ! . . . ❑Storage
:::
� I I I II 1 1 I 1 1 I 1 I I I ////' II I I I
_ I I I I II I I I I ��/�/
' ,, " 1 1 1 II 1 I I
581
11 I I I 1 I I 1 I I
a 580- 1 I I .. "/ . I II I 1 1 I I I 1 I I
d _ — I H + + I + I i+ r 1+ + + —II— 1 H r +
w - I I I I I I II I I I
579-"
I I II I I I II I I I
- n — — r — — - - r - 1- I I tt — r 11 - — + II 1 rtrr
578
II I I I I II I I I
/ / /
- Custom Stage Data / z / /
577
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000
Storage(cubic-feet)

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 93
Hydrograph for Pond 12P: POND
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 577.00 0.00 0.00 0.00
2.50 0.00 0 577.00 0.00 0.00 0.00
5.00 0.00 0 577.00 0.00 0.00 0.00
7.50 0.04 67 577.02 0.02 0.02 0.00
10.00 0.20 563 577.15 0.06 0.06 0.00
12.50 1.27 15,168 580.07 2.21 2.21 0.00
15.00 0.38 9,292 579.07 0.56 0.56 0.00
17.50 0.25 8,613 578.95 0.28 0.28 0.00
20.00 0.17 8,285 578.88 0.22 0.22 0.00
22.50 0.15 7,819 578.79 0.21 0.21 0.00
25.00 0.00 6,890 578.61 0.18 0.18 0.00
27.50 0.00 5,569 578.34 0.11 0.11 0.00
30.00 0.00 4,771 578.17 0.08 0.08 0.00
32.50 0.00 4,063 578.01 0.08 0.08 0.00
35.00 0.00 3,380 577.86 0.07 0.07 0.00
37.50 0.00 2,721 577.70 0.07 0.07 0.00
40.00 0.00 2,086 577.55 0.07 0.07 0.00
42.50 0.00 1,474 577.39 0.07 0.07 0.00
45.00 0.00 885 577.24 0.06 0.06 0.00
47.50 0.00 320 577.09 0.06 0.06 0.00
50.00 0.00 28 577.01 0.01 0.01 0.00
52.50 0.00 2 577.00 0.00 0.00 0.00
55.00 0.00 0 577.00 0.00 0.00 0.00
57.50 0.00 0 577.00 0.00 0.00 0.00
60.00 0.00 0 577.00 0.00 0.00 0.00
62.50 0.00 0 577.00 0.00 0.00 0.00
65.00 0.00 0 577.00 0.00 0.00 0.00
67.50 0.00 0 577.00 0.00 0.00 0.00
70.00 0.00 0 577.00 0.00 0.00 0.00
72.50 0.00 0 577.00 0.00 0.00 0.00
75.00 0.00 0 577.00 0.00 0.00 0.00
77.50 0.00 0 577.00 0.00 0.00 0.00
80.00 0.00 0 577.00 0.00 0.00 0.00
82.50 0.00 0 577.00 0.00 0.00 0.00
85.00 0.00 0 577.00 0.00 0.00 0.00
87.50 0.00 0 577.00 0.00 0.00 0.00
90.00 0.00 0 577.00 0.00 0.00 0.00
92.50 0.00 0 577.00 0.00 0.00 0.00
95.00 0.00 0 577.00 0.00 0.00 0.00
97.50 0.00 0 577.00 0.00 0.00 0.00
100.00 0.00 0 577.00 0.00 0.00 0.00
102.50 0.00 0 577.00 0.00 0.00 0.00
105.00 0.00 0 577.00 0.00 0.00 0.00
107.50 0.00 0 577.00 0.00 0.00 0.00
110.00 0.00 0 577.00 0.00 0.00 0.00
112.50 0.00 0 577.00 0.00 0.00 0.00
115.00 0.00 0 577.00 0.00 0.00 0.00
117.50 0.00 0 577.00 0.00 0.00 0.00
120.00 0.00 0 577.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 94
Stage-Discharge for Pond 12P: POND
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
577.00 0.00 0.00 0.00 582.20 21.86 17.06 4.79
577.10 0.06 0.06 0.00 582.30 26.02 17.18 8.84
577.20 0.06 0.06 0.00 582.40 30.96 17.29 13.66
577.30 0.07 0.07 0.00 582.50 36.50 17.41 19.09
577.40 0.07 0.07 0.00 582.60 42.62 17.52 25.10
577.50 0.07 0.07 0.00 582.70 48.91 17.64 31.27
577.60 0.07 0.07 0.00 582.80 55.53 17.75 37.78
577.70 0.07 0.07 0.00 582.90 62.86 17.86 45.00
577.80 0.07 0.07 0.00 583.00 70.57 17.97 52.60
577.90 0.08 0.08 0.00
578.00 0.08 0.08 0.00
578.10 0.08 0.08 0.00
578.20 0.08 0.08 0.00
578.30 0.10 0.10 0.00
578.40 0.13 0.13 0.00
578.50 0.16 0.16 0.00
578.60 0.18 0.18 0.00
578.70 0.19 0.19 0.00
578.80 0.21 0.21 0.00
578.90 0.22 0.22 0.00
579.00 0.38 0.38 0.00
579.10 0.63 0.63 0.00
579.20 0.89 0.89 0.00
579.30 1.06 1.06 0.00
579.40 1.20 1.20 0.00
579.50 1.33 1.33 0.00
579.60 1.44 1.44 0.00
579.70 1.57 1.57 0.00
579.80 1.75 1.75 0.00
579.90 1.95 1.95 0.00
580.00 2.11 2.11 0.00
580.10 2.25 2.25 0.00
580.20 2.38 2.38 0.00
580.30 2.54 2.54 0.00
580.40 2.74 2.74 0.00
580.50 2.97 2.97 0.00
580.60 3.21 3.21 0.00
580.70 3.41 3.41 0.00
580.80 3.58 3.58 0.00
580.90 4.46 4.46 0.00
581.00 5.91 5.91 0.00
581.10 8.87 8.87 0.00
581.20 13.10 13.10 0.00
581.30 15.98 15.98 0.00
581.40 16.10 16.10 0.00
581.50 16.23 16.23 0.00
581.60 16.35 16.35 0.00
581.70 16.47 16.47 0.00
581.80 16.59 16.59 0.00
581.90 16.71 16.71 0.00
582.00 16.83 16.83 0.00
582.10 18.64 16.95 1.69

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 95
Stage-Area-Storage for Pond 12P: POND
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
577.00 3,579 0 582.20 8,591 31,029
577.10 3,665 362 582.30 8,703 31,894
577.20 3,751 733 582.40 8,816 32,770
577.30 3,837 1,112 582.50 8,928 33,657
577.40 3,923 1,500 582.60 9,040 34,555
577.50 4,009 1,897 582.70 9,153 35,465
577.60 4,094 2,302 582.80 9,265 36,386
577.70 4,180 2,716 582.90 9,378 37,318
577.80 4,266 3,138 583.00 9,490 38,262
577.90 4,352 3,569
578.00 4,438 4,009
578.10 4,528 4,457
578.20 4,617 4,914
578.30 4,707 5,380
578.40 4,797 5,855
578.50 4,887 6,340
578.60 4,976 6,833
578.70 5,066 7,335
578.80 5,156 7,846
578.90 5,245 8,366
579.00 5,335 8,895
579.10 5,430 9,433
579.20 5,526 9,981
579.30 5,621 10,538
579.40 5,717 11,105
579.50 5,812 11,682
579.60 5,907 12,268
579.70 6,003 12,863
579.80 6,098 13,468
579.90 6,194 14,083
580.00 6,289 14,707
580.10 6,390 15,341
580.20 6,491 15,985
580.30 6,592 16,639
580.40 6,693 17,303
580.50 6,794 17,978
580.60 6,895 18,662
580.70 6,996 19,357
580.80 7,097 20,061
580.90 7,198 20,776
581.00 7,299 21,501
581.10 7,406 22,236
581.20 7,512 22,982
581.30 7,619 23,739
581.40 7,726 24,506
581.50 7,833 25,284
581.60 7,939 26,072
581.70 8,046 26,872
581.80 8,153 27,682
581.90 8,259 28,502
582.00 8,366 29,334
582.10 8,478 30,176

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 96
Summary for Link 6L: PRE DEV
Inflow Area = 4.340 ac, 4.61% Impervious, Inflow Depth = 2.35" for 25-Year event
Inflow = 8.98 cfs @ 12.23 hrs, Volume= 0.850 af
Primary = 8.98 cfs @ 12.23 hrs, Volume= 0.850 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 6L: PRE DEV
Hydrograph
rt -I- r -1 - I- rt -1- r rt -1- t —I — I— rt —I— fi —I — I— rt —I— r -I -
io-/-
1 I I I I I 1 I 1 I 1 1 I 1 1 I 11 ■Inflow 1
`
- /- 1 ass cfs I I I I I I I I I I I I I I I I I I I I El Primary
9� i �I89� 1 I 1 I 1 inflow lArea=4.1340lac
, ' I I 1 I 1 I 1 I 1 I 1 1 I
8� 1/ I I I 1 I 1 I 1 I 1 I 1
fi -
_ , 1 I I 11 11 11 11 11
7� 1/ I 1 I 1 I 1 I 1 I 1
= , I I 11 11 11 11 11
6 -/ ,_ — / —I — I— 4 —I— i— 4 — I— + 1 — I— 4 1— 4 1— 4 —1 I— —I — -
• 5L/ IV
LL / 1 I 1 I 1 I 1 I 1 I 1
4_ fi / rt r + rt
I
� '2 I 1 I 1 I 1 I 1 I 1
I
2 1 1 1 1 1 1 1 1 1
1- 1 1 1 1 1 1 1 1 1
7
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)

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 97
Hydrograph for Link 6L: PRE DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.00 0.00 0.00
10.00 0.00 0.00 0.00
12.50 4.89 0.00 4.89
15.00 0.58 0.00 0.58
17.50 0.37 0.00 0.37
20.00 0.26 0.00 0.26
22.50 0.23 0.00 0.23
25.00 0.00 0.00 0.00
27.50 0.00 0.00 0.00
30.00 0.00 0.00 0.00
32.50 0.00 0.00 0.00
35.00 0.00 0.00 0.00
37.50 0.00 0.00 0.00
40.00 0.00 0.00 0.00
42.50 0.00 0.00 0.00
45.00 0.00 0.00 0.00
47.50 0.00 0.00 0.00
50.00 0.00 0.00 0.00
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 98
Summary for Link 11 L: POST DEV
Inflow Area = 4.460 ac, 30.04% Impervious, Inflow Depth = 3.28" for 25-Year event
Inflow = 8.84 cfs @ 12.11 hrs, Volume= 1.220 of
Primary = 8.84 cfs @ 12.11 hrs, Volume= 1.220 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 11 L: POST DEV
Hydrograph
/ 1
I I
I I
I 1
I 1 1
I I I ❑Inflow
1 8.84 cfs I 1 1 0 Primary
9- I8.8 cf51/ 1 1 1 I1lnflow 1Area=4�460 I�ac-
1 1 1 1 I I I I 1 1 1 1 1 1 1 1
8 / LL — — T —I — LJ —I— LI — I— TI — LII— LJI— L —I
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
7 / L - — I— T —1 — 1 4 —1— L 1 — I— T 1 — 1 4 I— L -1 I— T —I
6 ✓ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1— H — I— + —1 — H —1 —1— 1— —1 — I— + —1 — H —1 —1— H H — I— + —1 —
33 5 t —1 — 1 1 —1— fi -I - I- rt -1 -
o
LL 4 /
— T 1 — T TI I— T —I I— T —1
3 I I I I I I I
I I I I I I I
2 I I I I I I I
1 1 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)

54647 - Drainage_Pre-Post Type II 24-hr 25-Year Rainfall=6.00"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 99
Hydrograph for Link 11 L: POST DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.02 0.00 0.02
10.00 0.08 0.00 0.08
12.50 3.78 0.00 3.78
15.00 0.85 0.00 0.85
17.50 0.47 0.00 0.47
20.00 0.35 0.00 0.35
22.50 0.32 0.00 0.32
25.00 0.18 0.00 0.18
27.50 0.11 0.00 0.11
30.00 0.08 0.00 0.08
32.50 0.08 0.00 0.08
35.00 0.07 0.00 0.07
37.50 0.07 0.00 0.07
40.00 0.07 0.00 0.07
42.50 0.07 0.00 0.07
45.00 0.06 0.00 0.06
47.50 0.06 0.00 0.06
50.00 0.01 0.00 0.01
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 100
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment3S: PredevelopmentPoint 1 Runoff Area=4.340 ac 4.61% Impervious Runoff Depth=2.91"
Flow Length=624' Tc=27.8 min CN=65 Runoff=11.26 cfs 1.053 af
Subcatchment4S: PostdevelopmentPoint Runoff Area=2.340 ac 48.29% Impervious Runoff Depth=4.57"
Tc=5.0 min CN=81 Runoff=18.62 cfs 0.892 af
Subcatchment7S: PredevelolpmentPoint 2 Runoff Area=1.110 ac 0.00% Impervious Runoff Depth=2.43"
Flow Length=114' Tc=32.3 min CN=60 Runoff=2.11 cfs 0.225 af
Subcatchment8S: BYPASS 1 Runoff Area=2.120 ac 9.91% Impervious Runoff Depth=3.21"
Flow Length=627' Tc=17.8 min CN=68 Runoff=8.01 cfs 0.567 af
Subcatchment9S: PostdevelopmentPoint 2 Runoff Area=1.000 ac 0.00% Impervious Runoff Depth=2.43"
Flow Length=93' Slope=0.0106 '/' Tc=28.5 min CN=60 Runoff=2.07 cfs 0.202 af
Pond 12P: POND Peak Elev=580.59' Storage=18,615 cf Inflow=18.62 cfs 0.892 af
Primary=3.19 cfs 0.892 af Secondary=0.00 cfs 0.000 af Outflow=3.19 cfs 0.892 af
Link 6L: PRE DEV Inflow=11.26 cfs 1.053 af
Primary=11.26 cfs 1.053 af
Link 11 L: POST DEV Inflow=11.19 cfs 1.459 af
Primary=11.19 cfs 1.459 af
Total Runoff Area = 10.910 ac Runoff Volume = 2.938 af Average Runoff Depth = 3.23"
85.88% Pervious = 9.370 ac 14.12% Impervious = 1.540 ac

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 101
Summary for Subcatchment 3S: Predevelopment Point 1
[47] Hint: Peak is 838% of capacity of segment#3
Runoff = 11.26 cfs @ 12.23 hrs, Volume= 1.053 af, Depth= 2.91"
Routed to Link 6L : PRE DEV
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 50-Year Rainfall=6.75"
Area (ac) CN Description
3.070 60 Woods, Fair, HSG B
0.320 73 Woods, Fair, HSG C
0.200 79 Woods, Fair, HSG D
0.120 56 Brush, Fair, HSG B
0.080 70 Brush, Fair, HSG C
0.350 77 Brush, Fair, HSG D
0.100 98 Paved parking, HSG B
0.060 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
4.340 65 Weighted Average
4.140 95.39% Pervious Area
0.200 4.61% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.9 254 0.0477 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
10.0 270 0.0391 0.45 1.34 Channel Flow, CHANNEL
Area= 3.0 sf Perim= 6.3' r= 0.48'
n= 0.400 Sheet flow: Woods+light brush
27.8 624 Total

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 102
Subcatchment 3S: Predevelopment Point 1
Hydrograph
1 1 1 1 1 1 1 1 1 1 11 1
12� 1 1 I I I I I I I I I I I I I 1 1 ■Runoff
I1126cfsIL LL _ I_ 1 _I_ L _I_ L _I _ L _L _ I_ I _ L _I - L _
I I I 1 1 I I 1 1 I I Type 11124-hr
10� � /
OrYeai IilainfaIIT6.`l51 _
9 I 1 I I I Ru nbff Area=4.340 ad
4 / r -I - r I I -I- fi -1 - 1- rt - I- -r -1- r -1 - r -
8� 1 I 1 1 I 1Runoffl Volumle�1.053 of
U 7_ T ,/ I I I I I I I I pI I .. ��
4- - / � - H - 1 -1- -1- Q'` 1D {�
h 1�,
_c 6� / I I I I I I 1 El Len�h=624
u 5L-' I
4- - % + + -II + I + I + I + + II-C=27A-rain -
4� (6
3_
�f'�I
3- - I- -1 1 4 1 + 1 1 I- 4 I- -k 1 L 1 I -
2.-/ ' I I I I I I 1 1 1
1:-' I I I I I 1 1
0 , �7������� ������ ��������������������������
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)

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 103
Hydrograph for Subcatchment 3S: Predevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.19 0.00 0.00
5.00 0.43 0.00 0.00
7.50 0.74 0.00 0.00
10.00 1.22 0.00 0.02
12.50 4.96 1.63 6.03
15.00 5.76 2.18 0.69
17.50 6.15 2.46 0.44
20.00 6.43 2.67 0.31
22.50 6.63 2.82 0.27
25.00 6.75 2.91 0.00
27.50 6.75 2.91 0.00
30.00 6.75 2.91 0.00
32.50 6.75 2.91 0.00
35.00 6.75 2.91 0.00
37.50 6.75 2.91 0.00
40.00 6.75 2.91 0.00
42.50 6.75 2.91 0.00
45.00 6.75 2.91 0.00
47.50 6.75 2.91 0.00
50.00 6.75 2.91 0.00
52.50 6.75 2.91 0.00
55.00 6.75 2.91 0.00
57.50 6.75 2.91 0.00
60.00 6.75 2.91 0.00
62.50 6.75 2.91 0.00
65.00 6.75 2.91 0.00
67.50 6.75 2.91 0.00
70.00 6.75 2.91 0.00
72.50 6.75 2.91 0.00
75.00 6.75 2.91 0.00
77.50 6.75 2.91 0.00
80.00 6.75 2.91 0.00
82.50 6.75 2.91 0.00
85.00 6.75 2.91 0.00
87.50 6.75 2.91 0.00
90.00 6.75 2.91 0.00
92.50 6.75 2.91 0.00
95.00 6.75 2.91 0.00
97.50 6.75 2.91 0.00
100.00 6.75 2.91 0.00
102.50 6.75 2.91 0.00
105.00 6.75 2.91 0.00
107.50 6.75 2.91 0.00
110.00 6.75 2.91 0.00
112.50 6.75 2.91 0.00
115.00 6.75 2.91 0.00
117.50 6.75 2.91 0.00
120.00 6.75 2.91 0.00

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 104
Summary for Subcatchment 4S: Postdevelopment Point 1
[49] Hint: Tc<2dt may require smaller dt
Runoff = 18.62 cfs @ 11.95 hrs, Volume= 0.892 af, Depth= 4.57"
Routed to Pond 12P : POND
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 50-Year Rainfall=6.75"
Area (ac) CN Description
0.850 61 >75% Grass cover, Good, HSG B
0.010 74 >75% Grass cover, Good, HSG C
0.240 80 >75% Grass cover, Good, HSG D
1.000 98 Paved parking, HSG B
0.130 98 Paved parking, HSG C
0.110 60 Woods, Fair, HSG B
2.340 81 Weighted Average
1.210 51.71% Pervious Area
1.130 48.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, DIRECT
Subcatchment 4S: Postdevelopment Point 1
Hydrograph
20 I I I I I I I I I I I I I I I I I I ■Runoff
118.627 I 1 I I 1 1 I I 1 1 I I 1 1 I I 1 1
18 T �$1�1 124 -
17 - - L 1 L 1 I L I L I �I— ah' -Ial11f I11 �'
16=' ,_ / L -1 - L 1 - I- L -1- L -I- ,T�_`y�� t e }1. aZ 1 - L -
15� - -1 - - I- - -I- -1- RUnbff AV e� =2.34O-a
14 I - I - - 1 - I I - 1- I 1 I -I- I -1 - I - 1- I - I -1 - I -
13 ' ,- - -I - - H - I- 4 -I- + -IRun-off1-Volume=4.892-af -
12 -I- t 1 - -I - I- -F -1- t -1- ii1Dp1 „
11 ,r 1 -I- ` -I - - -1 - I- rt -I- T -1- fi -
10 77 - I 7 17 71 7 T 1 T Tc±-5 in-"n1
LL 9; I - T T - I- T -I- T -I- T -1 - T T - I- T -I-/+I ���-�.�1 -.p1 7
8 i I I I I I I 1 1 1 CW81
6 /
I 1 I I I I I I 4= ✓ 1 1 I I I I I I I I I I I I I I I
3=' 1 ! 1 1 1 1 1 1 1 I 1 1 1
2=' 1 1 1 1 1
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)

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 105
Hydrograph for Subcatchment 4S: Postdevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.19 0.00 0.00
5.00 0.43 0.00 0.00
7.50 0.74 0.03 0.06
10.00 1.22 0.18 0.26
12.50 4.96 2.95 1.47
15.00 5.76 3.67 0.44
17.50 6.15 4.02 0.28
20.00 6.43 4.27 0.19
22.50 6.63 4.47 0.17
25.00 6.75 4.57 0.00
27.50 6.75 4.57 0.00
30.00 6.75 4.57 0.00
32.50 6.75 4.57 0.00
35.00 6.75 4.57 0.00
37.50 6.75 4.57 0.00
40.00 6.75 4.57 0.00
42.50 6.75 4.57 0.00
45.00 6.75 4.57 0.00
47.50 6.75 4.57 0.00
50.00 6.75 4.57 0.00
52.50 6.75 4.57 0.00
55.00 6.75 4.57 0.00
57.50 6.75 4.57 0.00
60.00 6.75 4.57 0.00
62.50 6.75 4.57 0.00
65.00 6.75 4.57 0.00
67.50 6.75 4.57 0.00
70.00 6.75 4.57 0.00
72.50 6.75 4.57 0.00
75.00 6.75 4.57 0.00
77.50 6.75 4.57 0.00
80.00 6.75 4.57 0.00
82.50 6.75 4.57 0.00
85.00 6.75 4.57 0.00
87.50 6.75 4.57 0.00
90.00 6.75 4.57 0.00
92.50 6.75 4.57 0.00
95.00 6.75 4.57 0.00
97.50 6.75 4.57 0.00
100.00 6.75 4.57 0.00
102.50 6.75 4.57 0.00
105.00 6.75 4.57 0.00
107.50 6.75 4.57 0.00
110.00 6.75 4.57 0.00
112.50 6.75 4.57 0.00
115.00 6.75 4.57 0.00
117.50 6.75 4.57 0.00
120.00 6.75 4.57 0.00

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 106
Summary for Subcatchment 7S: Predevelolpment Point 2
Runoff = 2.11 cfs @ 12.29 hrs, Volume= 0.225 af, Depth= 2.43"
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 50-Year Rainfall=6.75"
Area (ac) CN Description
1.110 60 Woods, Fair, HSG B
1.110 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 100 0.0093 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
0.4 14 0.0121 0.55 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
32.3 114 Total
Subcatchment 7S: Predevelolpment Point 2
Hydrograph
I I I I I I I
I I I I I I I I 1 I I e Runoff
- 1 1l2.11cfsI 1 I 1 I I 1 I I I I I I I 1 1
'T T 1 1 T I T 1 T 1 1 T 1 T Type tl'241ir
2 - I / I 1 I �
/ 1 1 1 1 1 1 so-Yearl Rlainfall=6.`751.
I 1 I I 1 I 1Runbff Awea=1.110 at
/ 1 I 1 I I 1 1 IIIII I 1 1
1 1 I I 1 Runoff Volume=0.225 af
y 11 I I 1
/ I I Dun 1ff 1De th 2.43�'
/ Q p 1
o / + 1 + + I + H + —Ficiw'tellti �l't11-4�
fL 1 1/ 1 1 I 1 I 1 1 1 1 1
1 1 I 1 1 I 1 1 Tc=32.3 m i n
/ CN6p
1 1 1 1 1 ' 1 1
1 1 1 1
1 1 1 1 1 1
o rz z ,, iiiiiii�i���liiiiiiiiiiJiiiJiiiiiiiiiiiJiii�iiiiiiiiiiiiiiiiiiiiiiiiiiiii�,
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)

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 107
Hydrograph for Subcatchment 7S: Predevelolpment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.19 0.00 0.00
5.00 0.43 0.00 0.00
7.50 0.74 0.00 0.00
10.00 1.22 0.00 0.00
12.50 4.96 1.28 1.52
15.00 5.76 1.77 0.16
17.50 6.15 2.02 0.10
20.00 6.43 2.21 0.07
22.50 6.63 2.35 0.06
25.00 6.75 2.43 0.00
27.50 6.75 2.43 0.00
30.00 6.75 2.43 0.00
32.50 6.75 2.43 0.00
35.00 6.75 2.43 0.00
37.50 6.75 2.43 0.00
40.00 6.75 2.43 0.00
42.50 6.75 2.43 0.00
45.00 6.75 2.43 0.00
47.50 6.75 2.43 0.00
50.00 6.75 2.43 0.00
52.50 6.75 2.43 0.00
55.00 6.75 2.43 0.00
57.50 6.75 2.43 0.00
60.00 6.75 2.43 0.00
62.50 6.75 2.43 0.00
65.00 6.75 2.43 0.00
67.50 6.75 2.43 0.00
70.00 6.75 2.43 0.00
72.50 6.75 2.43 0.00
75.00 6.75 2.43 0.00
77.50 6.75 2.43 0.00
80.00 6.75 2.43 0.00
82.50 6.75 2.43 0.00
85.00 6.75 2.43 0.00
87.50 6.75 2.43 0.00
90.00 6.75 2.43 0.00
92.50 6.75 2.43 0.00
95.00 6.75 2.43 0.00
97.50 6.75 2.43 0.00
100.00 6.75 2.43 0.00
102.50 6.75 2.43 0.00
105.00 6.75 2.43 0.00
107.50 6.75 2.43 0.00
110.00 6.75 2.43 0.00
112.50 6.75 2.43 0.00
115.00 6.75 2.43 0.00
117.50 6.75 2.43 0.00
120.00 6.75 2.43 0.00

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 108
Summary for Subcatchment 8S: BYPASS 1
Runoff = 8.01 cfs @ 12.11 hrs, Volume= 0.567 af, Depth= 3.21"
Routed to Link 11 L : POST DEV
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 50-Year Rainfall=6.75"
Area (ac) CN Description
1.180 60 Woods, Fair, HSG B
0.130 73 Woods, Fair, HSG C
0.170 61 >75% Grass cover, Good, HSG B
0.120 74 >75% Grass cover, Good, HSG C
0.310 80 >75% Grass cover, Good, HSG D
0.080 98 Paved parking, HSG B
0.090 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
2.120 68 Weighted Average
1.910 90.09% Pervious Area
0.210 9.91% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) _ (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.8 249 0.0472 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.1 278 0.0398 37.88 454.62 Channel Flow,
Area= 12.0 sf Perim= 7.2' r= 1.67'
n= 0.011 Concrete pipe, straight & clean
17.8 627 Total

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 109
Subcatchment 8S: BYPASS 1
Hydrograph
1 1 1 I I I I I I I I
I I 1 1 I I 1 I I 1 I I 1 1 I 1 1 I 1 1 ■Runoff
fi 18.olds l -r —I— fi —1 — I— rt —1— -r —1— fi —I — 1— rt — 1— -r —1 — — rt —1— -
8� 1 j I I 1 I I 1 I I 1 1 I Type 11124-hr
71/ I —I — — —i— —1— —i - �Y r Iinfl ' rI OaaalT6l5
L -1 — — _L -1- 1 -1— L — — Rtinb-ff-Ares-2A20 ad- -
61/ 1 1 1 1 1 1 I I I I I I I I I I I
1 1 1 1 I 1 I Runoff VQIIJrne O 567saf _
y 5� / 11 1 Ou;ngff 11Dppth73.4116'
`0 4� 1 / 1 1 1 1 1 1 1 1 FIOw(Length=627'
1 I 1 1 1 1 1 1 1 1 1 1 7 1 1 1
3
1 / 1 1 1 1 1 1 1 1 1 1 I Tc=17.18 rrri n- -
,
1 1 1 1 1 1 1 1 1 1 1 1 1 ''7L60- -
1 1 — 1- -I
2� 1 1 1 1 1 1 1 I 1 1
1L/ 1 1 1 1 1 1 1
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)

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 110
Hydrograph for Subcatchment 8S: BYPASS 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.19 0.00 0.00
5.00 0.43 0.00 0.00
7.50 0.74 0.00 0.00
10.00 1.22 0.02 0.04
12.50 4.96 1.85 1.88
15.00 5.76 2.44 0.35
17.50 6.15 2.74 0.22
20.00 6.43 2.95 0.16
22.50 6.63 3.12 0.14
25.00 6.75 3.21 0.00
27.50 6.75 3.21 0.00
30.00 6.75 3.21 0.00
32.50 6.75 3.21 0.00
35.00 6.75 3.21 0.00
37.50 6.75 3.21 0.00
40.00 6.75 3.21 0.00
42.50 6.75 3.21 0.00
45.00 6.75 3.21 0.00
47.50 6.75 3.21 0.00
50.00 6.75 3.21 0.00
52.50 6.75 3.21 0.00
55.00 6.75 3.21 0.00
57.50 6.75 3.21 0.00
60.00 6.75 3.21 0.00
62.50 6.75 3.21 0.00
65.00 6.75 3.21 0.00
67.50 6.75 3.21 0.00
70.00 6.75 3.21 0.00
72.50 6.75 3.21 0.00
75.00 6.75 3.21 0.00
77.50 6.75 3.21 0.00
80.00 6.75 3.21 0.00
82.50 6.75 3.21 0.00
85.00 6.75 3.21 0.00
87.50 6.75 3.21 0.00
90.00 6.75 3.21 0.00
92.50 6.75 3.21 0.00
95.00 6.75 3.21 0.00
97.50 6.75 3.21 0.00
100.00 6.75 3.21 0.00
102.50 6.75 3.21 0.00
105.00 6.75 3.21 0.00
107.50 6.75 3.21 0.00
110.00 6.75 3.21 0.00
112.50 6.75 3.21 0.00
115.00 6.75 3.21 0.00
117.50 6.75 3.21 0.00
120.00 6.75 3.21 0.00

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 111
Summary for Subcatchment 9S: Postdevelopment Point 2
Runoff = 2.07 cfs @ 12.24 hrs, Volume= 0.202 af, Depth= 2.43"
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 50-Year Rainfall=6.75"
Area (ac) CN Description
1.000 60 Woods, Fair, HSG B
1.000 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.5 93 0.0106 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
Subcatchment 9S: Postdevelopment Point 2
Hydrograph
/ I I I I I I I I I I I
I 1 I I 1 I I I I I ■Runoff
12.07 cfs 11 I I I 1 I I 1 1 I I 1
pe 1
2 . 2 I I I 1 I I 1 Ty7 I24 4 =
/ 1 1 I 1 $0-Year, R1lainfalIT6.`75 '
/ 1 I IRunbff Awea=1.000 at
Runoff Volume=0.202 af
/ 1 I I I I I Ou;ngff,Depth=2.43"
o / T 7 T T 1 1FFoW I-1-e4gth 931-
-
u_ 1 / 1 1 1 1 I I I I I 1 1 1
j1 11 11 1 11 1 1 Slope=0.0106 '/'
/ 1 1 1 1 1 1 Tc=28.5 mi In
1 1 1 1 1 1 1'
1 1 1 1 1 1 CN=60
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)

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 112
Hydrograph for Subcatchment 9S: Postdevelopment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.19 0.00 0.00
5.00 0.43 0.00 0.00
7.50 0.74 0.00 0.00
10.00 1.22 0.00 0.00
12.50 4.96 1.28 1.20
15.00 5.76 1.77 0.14
17.50 6.15 2.02 0.09
20.00 6.43 2.21 0.06
22.50 6.63 2.35 0.06
25.00 6.75 2.43 0.00
27.50 6.75 2.43 0.00
30.00 6.75 2.43 0.00
32.50 6.75 2.43 0.00
35.00 6.75 2.43 0.00
37.50 6.75 2.43 0.00
40.00 6.75 2.43 0.00
42.50 6.75 2.43 0.00
45.00 6.75 2.43 0.00
47.50 6.75 2.43 0.00
50.00 6.75 2.43 0.00
52.50 6.75 2.43 0.00
55.00 6.75 2.43 0.00
57.50 6.75 2.43 0.00
60.00 6.75 2.43 0.00
62.50 6.75 2.43 0.00
65.00 6.75 2.43 0.00
67.50 6.75 2.43 0.00
70.00 6.75 2.43 0.00
72.50 6.75 2.43 0.00
75.00 6.75 2.43 0.00
77.50 6.75 2.43 0.00
80.00 6.75 2.43 0.00
82.50 6.75 2.43 0.00
85.00 6.75 2.43 0.00
87.50 6.75 2.43 0.00
90.00 6.75 2.43 0.00
92.50 6.75 2.43 0.00
95.00 6.75 2.43 0.00
97.50 6.75 2.43 0.00
100.00 6.75 2.43 0.00
102.50 6.75 2.43 0.00
105.00 6.75 2.43 0.00
107.50 6.75 2.43 0.00
110.00 6.75 2.43 0.00
112.50 6.75 2.43 0.00
115.00 6.75 2.43 0.00
117.50 6.75 2.43 0.00
120.00 6.75 2.43 0.00

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 113
Summary for Pond 12P: POND
[44] Hint: Outlet device#2 is below defined storage
Inflow Area = 2.340 ac, 48.29% Impervious, Inflow Depth = 4.57" for 50-Year event
Inflow = 18.62 cfs @ 11.95 hrs, Volume= 0.892 af
Outflow = 3.19 cfs @ 12.14 hrs, Volume= 0.892 af, Atten= 83%, Lag= 11.4 min
Primary = 3.19 cfs @ 12.14 hrs, Volume= 0.892 af
Routed to Link 11 L : POST DEV
Secondary= 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to Link 11 L : POST DEV
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 580.59'@ 12.14 hrs Surf.Area= 6,888 sf Storage= 18,615 cf
Plug-Flow detention time=320.1 min calculated for 0.892 af(100% of inflow)
Center-of-Mass det. time= 319.9 min ( 1,122.8 - 802.9 )
Volume Invert Avail.Storage Storage Description
#1 577.00' 38,262 cf Custom Stage Data (Prismatic)Listed below(Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
577.00 3,579 0 0
578.00 4,438 4,009 4,009
579.00 5,335 4,887 8,895
580.00 6,289 5,812 14,707
581.00 7,299 6,794 21,501
582.00 8,366 7,833 29,334
583.00 9,490 8,928 38,262
Device Routing Invert Outlet Devices
#1 Primary 575.50' 15.0" Round Culvert
L= 57.4' RCP, rounded edge headwall, Ke= 0.100
Inlet/ Outlet Invert= 575.50'/ 573.63' S= 0.0326 '/' Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf
#2 Device 1 575.50' SAND FILTER
Head (feet) 0.00 1.00 1.50 2.50 3.50 4.50 5.50 6.50
Disch. (cfs) 0.000 0.052 0.060 0.077 0.095 0.112 0.129 0.146
#3 Device 1 578.21' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#4 Device 1 578.89' 15.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1 579.63' 6.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#6 Device 1 580.18' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#7 Device 1 580.80' 2.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32
#8 Device 1 581.00' 3.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a sin 08663 ©2021 HydroCAD Software Solutions LLC Page 114
#9 Secondary 582.00' 20.0' long x 16.0' breadth EMERGENCY SPILLWAY
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=3.19 cfs @ 12.14 hrs HW=580.59' (Free Discharge)
-1=Culvert (Passes 3.19 cfs of 15.07 cfs potential flow)
-2=SAND FILTER (Custom Controls 0.12 cfs)
-3=Orifice/Grate (Orifice Controls 0.25 cfs @ 7.27 fps)
-4=Orifice/Grate (Orifice Controls 1.89 cfs @ 6.05 fps)
-5=Orifice/Grate (Orifice Controls 0.55 cfs @ 4.40 fps)
-6=Orifice/Grate (Orifice Controls 0.38 cfs @ 2.19 fps)
-7=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
-8=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=577.00' (Free Discharge)
L9=EMERGENCY SPILLWAY( Controls 0.00 cfs)
Pond 12P: POND
Hydrograph
I I
/111111
1 1 I 1 I 1 I 1 I I 1 I 1 I 1 ■Inflow
18.62 cfs I D Outflow
/ • 1 , 1 4 - 1- r -1 -1- 1- -1 1- 4 - 1-_� 1- - Primar
El
' / / /• ' rt -1 - 1- 1- H -1- 1- -h �w Imired--'r2• o lac - 0 Secondary
204-/ , z / /i T T T T T ,�T�� Ip
18 / / ' /1 1 1 1 1 1 1 1 1 1 1� "'I" ��I" �I�'
17� / / / I _ H -1 - 1_ L J -1- 1- 1 J -1St 1-8"6�1� -
16� / / / / HHIIHHIIHHIHHIHIIHH -
15=' / / /1_
- L T T T 1 T T 1 L T 71717 L H 1 T
14� , i /I
124 / / / /1
w 12= / / , L 1 L L 1 1 L L 1 1 T J 1 L L 1 1 L H 1 1 L -
� 11 ,=' / / / L 4 1 I- -1 -1 - 1 H - 1- 1- T - -1 1 T -1 - 1 I- -I 1- 1- H -
a 10=' / / / //- rt I- I- -1 I I t i I 1 T H I L fi I I L rt I I t -
8� / / /1 1 1 I III I III 1 III 1 III I III
6 -/ / / / /LI3.19cfs 1LHI1HJITHIH4J11- HI 1- -H
5 / / /I3.19cfs I- L 4 1 1 t H 1 1 + H -I- H T 1 1 L -+ 1 1 H -
44-' / / iirAosir /..
3' / � ///////////////////////////////////////////////////////////�////�///////�
o o r////// / / ,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)

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 115
Pond 12P: POND
Stage-Discharge
I I I I ❑Total
583 ❑Primary
❑Secondary
EMERGENCY SPILLWAY
582 I I �� I
/�// % I I
*/� Broad-Crested Rectangular Weir
Broad-Crested Rectangular Weir I I
581 / I I
5 Orifice/Grate I I
I
c 580 �- /0 Orifice/Grate I
/ I I I I I
Orifice/Grate
w I
579 7 I
Orifice/Grate I I
578 O% I I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Discharge (cfs)
Pond 12P: POND
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 500 1,000 1,500 2,000 2,500 3,000 3,5004,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 0 Surface
. . ' . . . ! . . . ' . . .
. . . ! . . . I . ( . I . . . ! . . . I . . . I . . . 1 , , . I . . . ' . . . 1 . . . I . . . ' . . . ! . . . ❑Storage
:::
� I I I II 1 1 I 1 1 I I I I ////' II I I I
_ I I I I II I I I ��/�/
' ,, " I I I II I I I
581
I , I I I I I II I I I
a 580- 1 I I .. "/ . I II I I I I II I I I
d _ — I H + + I + 1 I 1+ r I+ + + II I -1r +
w - I I I II I II I II
579-"
I I II I I I I II I I I
- n — — r — — - - r - 1- I I tt — r 111 — + II 1 rtrr
578
II I I I I II 1 II
/ / /
- Custom Stage Data / z / /
577
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000
Storage(cubic-feet)

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 116
Hydrograph for Pond 12P: POND
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 577.00 0.00 0.00 0.00
2.50 0.00 0 577.00 0.00 0.00 0.00
5.00 0.00 0 577.00 0.00 0.00 0.00
7.50 0.06 123 577.03 0.03 0.03 0.00
10.00 0.26 871 577.24 0.06 0.06 0.00
12.50 1.47 17,397 580.41 2.77 2.77 0.00
15.00 0.44 9,647 579.14 0.74 0.74 0.00
17.50 0.28 8,736 578.97 0.32 0.32 0.00
20.00 0.19 8,416 578.91 0.23 0.23 0.00
22.50 0.17 8,094 578.85 0.21 0.21 0.00
25.00 0.00 7,205 578.67 0.19 0.19 0.00
27.50 0.00 5,774 578.38 0.13 0.13 0.00
30.00 0.00 4,909 578.20 0.08 0.08 0.00
32.50 0.00 4,197 578.04 0.08 0.08 0.00
35.00 0.00 3,509 577.89 0.08 0.08 0.00
37.50 0.00 2,845 577.73 0.07 0.07 0.00
40.00 0.00 2,205 577.58 0.07 0.07 0.00
42.50 0.00 1,589 577.42 0.07 0.07 0.00
45.00 0.00 996 577.27 0.06 0.06 0.00
47.50 0.00 427 577.12 0.06 0.06 0.00
50.00 0.00 45 577.01 0.01 0.01 0.00
52.50 0.00 4 577.00 0.00 0.00 0.00
55.00 0.00 0 577.00 0.00 0.00 0.00
57.50 0.00 0 577.00 0.00 0.00 0.00
60.00 0.00 0 577.00 0.00 0.00 0.00
62.50 0.00 0 577.00 0.00 0.00 0.00
65.00 0.00 0 577.00 0.00 0.00 0.00
67.50 0.00 0 577.00 0.00 0.00 0.00
70.00 0.00 0 577.00 0.00 0.00 0.00
72.50 0.00 0 577.00 0.00 0.00 0.00
75.00 0.00 0 577.00 0.00 0.00 0.00
77.50 0.00 0 577.00 0.00 0.00 0.00
80.00 0.00 0 577.00 0.00 0.00 0.00
82.50 0.00 0 577.00 0.00 0.00 0.00
85.00 0.00 0 577.00 0.00 0.00 0.00
87.50 0.00 0 577.00 0.00 0.00 0.00
90.00 0.00 0 577.00 0.00 0.00 0.00
92.50 0.00 0 577.00 0.00 0.00 0.00
95.00 0.00 0 577.00 0.00 0.00 0.00
97.50 0.00 0 577.00 0.00 0.00 0.00
100.00 0.00 0 577.00 0.00 0.00 0.00
102.50 0.00 0 577.00 0.00 0.00 0.00
105.00 0.00 0 577.00 0.00 0.00 0.00
107.50 0.00 0 577.00 0.00 0.00 0.00
110.00 0.00 0 577.00 0.00 0.00 0.00
112.50 0.00 0 577.00 0.00 0.00 0.00
115.00 0.00 0 577.00 0.00 0.00 0.00
117.50 0.00 0 577.00 0.00 0.00 0.00
120.00 0.00 0 577.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 117
Stage-Discharge for Pond 12P: POND
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
577.00 0.00 0.00 0.00 582.20 21.86 17.06 4.79
577.10 0.06 0.06 0.00 582.30 26.02 17.18 8.84
577.20 0.06 0.06 0.00 582.40 30.96 17.29 13.66
577.30 0.07 0.07 0.00 582.50 36.50 17.41 19.09
577.40 0.07 0.07 0.00 582.60 42.62 17.52 25.10
577.50 0.07 0.07 0.00 582.70 48.91 17.64 31.27
577.60 0.07 0.07 0.00 582.80 55.53 17.75 37.78
577.70 0.07 0.07 0.00 582.90 62.86 17.86 45.00
577.80 0.07 0.07 0.00 583.00 70.57 17.97 52.60
577.90 0.08 0.08 0.00
578.00 0.08 0.08 0.00
578.10 0.08 0.08 0.00
578.20 0.08 0.08 0.00
578.30 0.10 0.10 0.00
578.40 0.13 0.13 0.00
578.50 0.16 0.16 0.00
578.60 0.18 0.18 0.00
578.70 0.19 0.19 0.00
578.80 0.21 0.21 0.00
578.90 0.22 0.22 0.00
579.00 0.38 0.38 0.00
579.10 0.63 0.63 0.00
579.20 0.89 0.89 0.00
579.30 1.06 1.06 0.00
579.40 1.20 1.20 0.00
579.50 1.33 1.33 0.00
579.60 1.44 1.44 0.00
579.70 1.57 1.57 0.00
579.80 1.75 1.75 0.00
579.90 1.95 1.95 0.00
580.00 2.11 2.11 0.00
580.10 2.25 2.25 0.00
580.20 2.38 2.38 0.00
580.30 2.54 2.54 0.00
580.40 2.74 2.74 0.00
580.50 2.97 2.97 0.00
580.60 3.21 3.21 0.00
580.70 3.41 3.41 0.00
580.80 3.58 3.58 0.00
580.90 4.46 4.46 0.00
581.00 5.91 5.91 0.00
581.10 8.87 8.87 0.00
581.20 13.10 13.10 0.00
581.30 15.98 15.98 0.00
581.40 16.10 16.10 0.00
581.50 16.23 16.23 0.00
581.60 16.35 16.35 0.00
581.70 16.47 16.47 0.00
581.80 16.59 16.59 0.00
581.90 16.71 16.71 0.00
582.00 16.83 16.83 0.00
582.10 18.64 16.95 1.69

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 118
Stage-Area-Storage for Pond 12P: POND
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
577.00 3,579 0 582.20 8,591 31,029
577.10 3,665 362 582.30 8,703 31,894
577.20 3,751 733 582.40 8,816 32,770
577.30 3,837 1,112 582.50 8,928 33,657
577.40 3,923 1,500 582.60 9,040 34,555
577.50 4,009 1,897 582.70 9,153 35,465
577.60 4,094 2,302 582.80 9,265 36,386
577.70 4,180 2,716 582.90 9,378 37,318
577.80 4,266 3,138 583.00 9,490 38,262
577.90 4,352 3,569
578.00 4,438 4,009
578.10 4,528 4,457
578.20 4,617 4,914
578.30 4,707 5,380
578.40 4,797 5,855
578.50 4,887 6,340
578.60 4,976 6,833
578.70 5,066 7,335
578.80 5,156 7,846
578.90 5,245 8,366
579.00 5,335 8,895
579.10 5,430 9,433
579.20 5,526 9,981
579.30 5,621 10,538
579.40 5,717 11,105
579.50 5,812 11,682
579.60 5,907 12,268
579.70 6,003 12,863
579.80 6,098 13,468
579.90 6,194 14,083
580.00 6,289 14,707
580.10 6,390 15,341
580.20 6,491 15,985
580.30 6,592 16,639
580.40 6,693 17,303
580.50 6,794 17,978
580.60 6,895 18,662
580.70 6,996 19,357
580.80 7,097 20,061
580.90 7,198 20,776
581.00 7,299 21,501
581.10 7,406 22,236
581.20 7,512 22,982
581.30 7,619 23,739
581.40 7,726 24,506
581.50 7,833 25,284
581.60 7,939 26,072
581.70 8,046 26,872
581.80 8,153 27,682
581.90 8,259 28,502
582.00 8,366 29,334
582.10 8,478 30,176

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 119
Summary for Link 6L: PRE DEV
Inflow Area = 4.340 ac, 4.61% Impervious, Inflow Depth = 2.91" for 50-Year event
Inflow = 11.26 cfs @ 12.23 hrs, Volume= 1.053 af
Primary = 11.26 cfs @ 12.23 hrs, Volume= 1.053 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 6L: PRE DEV
Hydrograph
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 I I ■Inflow `
❑Prima 1
12� J 11.26 cfs I L 1— J _1_ i— _1 _ 1_ + 1 H 4 1 H _1 1 _L 1 i— _1 _ 1_ ry
: / i 11.26cfs V 1 1 1 1 1 1 InflowlArea=4.13401ac
10 i 111111 11 II III II
- /
101! -1 1— -1 — I— -k -1 — I— -1 -1- 4- -1 - 1- 4- -1 - 1— - - 1-
- / 11 1 1 1 1 1 1 11 11 III 11
9� 1 1 1 1 1 1 1 11 II III
- /
8� 4 4 —I — I- 4 —I— t- 4 - 1— + 1 — I- 4 -1- 4 - - 1— + —I - 1 - — — -
-
7- z 1/ H
1 1 1 1 1 1 H
11 1 1 1 1a 6 ' 40 — — - 4 -1— {- 4 - 1— + 1 — - 1— H41- 4 -1HH — -
LL - I
5 -/- i I I I I I I I I I 11 I II III
4� ! 1— -h —1— i— -h — 1— + —1 — I— -h —1— t H — 1— t —1 — I
/3 0 1 1 1 1 1 1 1 1 1 1 1 I I
1,/ I I I I I 1 1 1 1 1 1
2 I P 1 1 1 1 1 1 I I
1 '�% // % %
o % ////////////////////////////////////////////////////////////////////////////%
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)

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 120
Hydrograph for Link 6L: PRE DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.00 0.00 0.00
10.00 0.02 0.00 0.02
12.50 6.03 0.00 6.03
15.00 0.69 0.00 0.69
17.50 0.44 0.00 0.44
20.00 0.31 0.00 0.31
22.50 0.27 0.00 0.27
25.00 0.00 0.00 0.00
27.50 0.00 0.00 0.00
30.00 0.00 0.00 0.00
32.50 0.00 0.00 0.00
35.00 0.00 0.00 0.00
37.50 0.00 0.00 0.00
40.00 0.00 0.00 0.00
42.50 0.00 0.00 0.00
45.00 0.00 0.00 0.00
47.50 0.00 0.00 0.00
50.00 0.00 0.00 0.00
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 121
Summary for Link 11 L: POST DEV
Inflow Area = 4.460 ac, 30.04% Impervious, Inflow Depth = 3.92" for 50-Year event
Inflow = 11.19 cfs @ 12.11 hrs, Volume= 1.459 af
Primary = 11.19 cfs @ 12.11 hrs, Volume= 1.459 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 11 L: POST DEV
Hydrograph
/ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
■Inflow 1
121/ A_12 4 11.19 cfs I i— + -I- 1- - I- + -I - I- 4 -I- -I - I- 4 -I- 1- -I - I- CI Primary
l 11.19cfs 1/ 111111 InflowlArea=4.146O lac
11� T
10 -/ k -/ -1 - I- 4 —I— {— - — 1— + I — I— -+ I— I— 4 I 1— - — -
1 I I I I I I I I I 1 I I 1
9 -/ / 1 1 I I I I I I 1 1 1 1 1
i
8 -/ k —/ —1 — 1— 1 -1— 1— H — 1— + 1 — I— A 1— H H I— H 1 1— H — -
_ I I I I I I 1 I I 1
Zul 7� /
3 61/ k — — H -1- 1— H - 1— + 1 — — A1— HH — H —IHH
LL =5 ,/ A_ 1, 1 1 1 1 1 1 1 1 1 1 1
I I I I I I I I I I I I I I I I I
4� / k I— H —1— 1— - h — 1— + —1 — I— -h —1— t H — I— t —'
- /
3y
- z 1 I I I 1
2 -/ fi — 1— H 1 t 1 1 H fi f— H — -
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)

54647 - Drainage_Pre-Post Type II 24-hr 50-Year Rainfall=6.75"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 122
Hydrograph for Link 11 L: POST DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.03 0.00 0.03
10.00 0.11 0.00 0.11
12.50 4.66 0.00 4.66
15.00 1.09 0.00 1.09
17.50 0.54 0.00 0.54
20.00 0.39 0.00 0.39
22.50 0.35 0.00 0.35
25.00 0.19 0.00 0.19
27.50 0.13 0.00 0.13
30.00 0.08 0.00 0.08
32.50 0.08 0.00 0.08
35.00 0.08 0.00 0.08
37.50 0.07 0.00 0.07
40.00 0.07 0.00 0.07
42.50 0.07 0.00 0.07
45.00 0.06 0.00 0.06
47.50 0.06 0.00 0.06
50.00 0.01 0.00 0.01
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 123
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment3S: PredevelopmentPoint 1 Runoff Area=4.340 ac 4.61% Impervious Runoff Depth=3.52"
Flow Length=624' Tc=27.8 min CN=65 Runoff=13.75 cfs 1.272 af
Subcatchment4S: PostdevelopmentPoint Runoff Area=2.340 ac 48.29% Impervious Runoff Depth=5.30"
Tc=5.0 min CN=81 Runoff=21.41 cfs 1.034 af
Subcatchment7S: PredevelolpmentPoint 2 Runoff Area=1.110 ac 0.00% Impervious Runoff Depth=2.99"
Flow Length=114' Tc=32.3 min CN=60 Runoff=2.64 cfs 0.276 af
Subcatchment8S: BYPASS 1 Runoff Area=2.120 ac 9.91% Impervious Runoff Depth=3.84"
Flow Length=627' Tc=17.8 min CN=68 Runoff=9.62 cfs 0.679 af
Subcatchment9S: PostdevelopmentPoint 2 Runoff Area=1.000 ac 0.00% Impervious Runoff Depth=2.99"
Flow Length=93' Slope=0.0106 '/' Tc=28.5 min CN=60 Runoff=2.59 cfs 0.249 af
Pond 12P: POND Peak Elev=580.97' Storage=21,252 cf Inflow=21.41 cfs 1.034 af
Primary=5.36 cfs 1.034 af Secondary=0.00 cfs 0.000 af Outflow=5.36 cfs 1.034 af
Link 6L: PRE DEV Inflow=13.75 cfs 1.272 of
Primary=13.75 cfs 1.272 af
Link 11 L: POST DEV Inflow=14.98 cfs 1.713 af
Primary=14.98 cfs 1.713 af
Total Runoff Area = 10.910 ac Runoff Volume = 3.510 af Average Runoff Depth = 3.86"
85.88% Pervious = 9.370 ac 14.12% Impervious = 1.540 ac

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 124
Summary for Subcatchment 3S: Predevelopment Point 1
[47] Hint: Peak is 1023% of capacity of segment#3
Runoff = 13.75 cfs @ 12.22 hrs, Volume= 1.272 af, Depth= 3.52"
Routed to Link 6L : PRE DEV
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 100-Year Rainfall=7.53"
Area (ac) CN Description
3.070 60 Woods, Fair, HSG B
0.320 73 Woods, Fair, HSG C
0.200 79 Woods, Fair, HSG D
0.120 56 Brush, Fair, HSG B
0.080 70 Brush, Fair, HSG C
0.350 77 Brush, Fair, HSG D
0.100 98 Paved parking, HSG B
0.060 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
4.340 65 Weighted Average
4.140 95.39% Pervious Area
0.200 4.61% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.9 254 0.0477 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
10.0 270 0.0391 0.45 1.34 Channel Flow, CHANNEL
Area= 3.0 sf Perim= 6.3' r= 0.48'
n= 0.400 Sheet flow: Woods+light brush
27.8 624 Total

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 125
Subcatchment 3S: Predevelopment Point 1
Hydrograph
/_ A 11 L _1 L I B L I LA 11 I L I L _
15� I 1 1 I I I I I I I I I I I I I I I I ■Runoff
14 -/ 113.75 cfs I I I I 1 1 I I 1 1 I I 1 1 I I 1 1
- i I F -I - TT - 1- 7 -1- T -1- T -1 - TT 1Type-1IT2441r
13� k 1 —I — — I— — — + — — — — I— — —I
12 1 I 1 1 1*OTYVail Fain aii-r f - 3,
11 1 1 I 1 1 I I 1 1 nbff Area=4..34D ad —
10� ✓ 1 1 I I I I I I I
- -r 1- -1 - 1- rt 1- T -Runoff -2-a# -
w 9� ,_ — — 4 4 —I 1 4 1 T 1 L L- — ,,
8� un4 1��1-; 1 I I-
7� / 1 i 1 1 I I I I I F]Ow',LengtlL Q24
6 -/ —/ -r — — fi 1 1— -1 1 rt 1 fi -1- fi 1 1rt 1Tc=2218-min -
5- —/ 4 - - L I I- -1 1 4 1 T 1 L I I— 4 1 -k 1 r6 Kii k
4;' 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 'f"I�l'
3 / / 1 1 I I I I I I I I I 1 1 1 1 I I
� 1 1 1 1 1 1 1 1 1 1 1 I 1 1
2� 4 '% 1- H - 1— fi —I— t -1— H -1 — HH - 1 1 — H -
1- 4,.... //��������� IIIIII/
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)

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 126
Hydrograph for Subcatchment 3S: Predevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.21 0.00 0.00
5.00 0.47 0.00 0.00
7.50 0.82 0.00 0.00
10.00 1.36 0.01 0.07
12.50 5.53 2.02 7.25
15.00 6.43 2.67 0.81
17.50 6.87 3.00 0.51
20.00 7.17 3.23 0.36
22.50 7.40 3.42 0.31
25.00 7.53 3.52 0.01
27.50 7.53 3.52 0.00
30.00 7.53 3.52 0.00
32.50 7.53 3.52 0.00
35.00 7.53 3.52 0.00
37.50 7.53 3.52 0.00
40.00 7.53 3.52 0.00
42.50 7.53 3.52 0.00
45.00 7.53 3.52 0.00
47.50 7.53 3.52 0.00
50.00 7.53 3.52 0.00
52.50 7.53 3.52 0.00
55.00 7.53 3.52 0.00
57.50 7.53 3.52 0.00
60.00 7.53 3.52 0.00
62.50 7.53 3.52 0.00
65.00 7.53 3.52 0.00
67.50 7.53 3.52 0.00
70.00 7.53 3.52 0.00
72.50 7.53 3.52 0.00
75.00 7.53 3.52 0.00
77.50 7.53 3.52 0.00
80.00 7.53 3.52 0.00
82.50 7.53 3.52 0.00
85.00 7.53 3.52 0.00
87.50 7.53 3.52 0.00
90.00 7.53 3.52 0.00
92.50 7.53 3.52 0.00
95.00 7.53 3.52 0.00
97.50 7.53 3.52 0.00
100.00 7.53 3.52 0.00
102.50 7.53 3.52 0.00
105.00 7.53 3.52 0.00
107.50 7.53 3.52 0.00
110.00 7.53 3.52 0.00
112.50 7.53 3.52 0.00
115.00 7.53 3.52 0.00
117.50 7.53 3.52 0.00
120.00 7.53 3.52 0.00

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 127
Summary for Subcatchment 4S: Postdevelopment Point 1
[49] Hint: Tc<2dt may require smaller dt
Runoff = 21.41 cfs @ 11.95 hrs, Volume= 1.034 af, Depth= 5.30"
Routed to Pond 12P : POND
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 100-Year Rainfall=7.53"
Area (ac) CN Description
0.850 61 >75% Grass cover, Good, HSG B
0.010 74 >75% Grass cover, Good, HSG C
0.240 80 >75% Grass cover, Good, HSG D
1.000 98 Paved parking, HSG B
0.130 98 Paved parking, HSG C
0.110 60 Woods, Fair, HSG B
2.340 81 Weighted Average
1.210 51.71% Pervious Area
1.130 48.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, DIRECT
Subcatchment 4S: Postdevelopment Point 1
Hydrograph
11 1 I I I I I I I 11 1
23 ,_ I 1 1 I I _ i I 1 1 I I 1 1 I 1 1 I I 1 1 — ■Runoff
22 1 21 41 cfs 14 I t 1 — 4 4 I L 1 H 1 H 4 IT 4 1 t wI2-4 H -
21 — t -1— t —I - 1- -4 — I- 4 -1 + -1— t I — — # — (Type-I �
19 / I�O r a gaipfZaH�75 1—
18 -/ —
17 — L —1 L I — 1 L —I_ L _1_ RUiibff A!a=234O_ad
164-/ - 4 — 4 -1— t 1 - 44 — I- 4 -1 H —I-- 4 1 - 44 — I 1— t 1 — —
154 r -1- 7 -I - 4 - I- H -1-
14
�wQff � �u
I I I I I I I I I I I I IIM" 1F 1 1 011 - —I — — 1- 4 —I— —1— —I — 4 — I—TC—5.40it]h
LL 10� 1 t I t 1 t1 I -L —I— t I t 1 74 1 t —I—//++t�H�.�. H -
9; 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I CF4 8r
I I I I I I I I I I I I I I I I I I I I —
64' — — t —1— t 1 H 4 I_ 4 I t 1 H 1 H 4 I t 1 t 1 H -
54-/ 4 t 1 I— —I —1 t I 1 1 t I t 1 —
3 � -I 7 T T 7 7 T T 7 _
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)

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 128
Hydrograph for Subcatchment 4S: Postdevelopment Point 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.21 0.00 0.00
5.00 0.47 0.00 0.00
7.50 0.82 0.05 0.09
10.00 1.36 0.25 0.32
12.50 5.53 3.46 1.67
15.00 6.43 4.27 0.50
17.50 6.87 4.68 0.32
20.00 7.17 4.96 0.22
22.50 7.40 5.18 0.20
25.00 7.53 5.30 0.00
27.50 7.53 5.30 0.00
30.00 7.53 5.30 0.00
32.50 7.53 5.30 0.00
35.00 7.53 5.30 0.00
37.50 7.53 5.30 0.00
40.00 7.53 5.30 0.00
42.50 7.53 5.30 0.00
45.00 7.53 5.30 0.00
47.50 7.53 5.30 0.00
50.00 7.53 5.30 0.00
52.50 7.53 5.30 0.00
55.00 7.53 5.30 0.00
57.50 7.53 5.30 0.00
60.00 7.53 5.30 0.00
62.50 7.53 5.30 0.00
65.00 7.53 5.30 0.00
67.50 7.53 5.30 0.00
70.00 7.53 5.30 0.00
72.50 7.53 5.30 0.00
75.00 7.53 5.30 0.00
77.50 7.53 5.30 0.00
80.00 7.53 5.30 0.00
82.50 7.53 5.30 0.00
85.00 7.53 5.30 0.00
87.50 7.53 5.30 0.00
90.00 7.53 5.30 0.00
92.50 7.53 5.30 0.00
95.00 7.53 5.30 0.00
97.50 7.53 5.30 0.00
100.00 7.53 5.30 0.00
102.50 7.53 5.30 0.00
105.00 7.53 5.30 0.00
107.50 7.53 5.30 0.00
110.00 7.53 5.30 0.00
112.50 7.53 5.30 0.00
115.00 7.53 5.30 0.00
117.50 7.53 5.30 0.00
120.00 7.53 5.30 0.00

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 129
Summary for Subcatchment 7S: Predevelolpment Point 2
Runoff = 2.64 cfs @ 12.29 hrs, Volume= 0.276 af, Depth= 2.99"
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 100-Year Rainfall=7.53"
Area (ac) CN Description
1.110 60 Woods, Fair, HSG B
1.110 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 100 0.0093 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
0.4 14 0.0121 0.55 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
32.3 114 Total
Subcatchment 7S: Predevelolpment Point 2
Hydrograph
' I I I I I
I 1 I I I 1 I I ❑Runoff
l 2s4 cfs 1 I i 1 1 I I I I I I I I I I I
• 1 I 1 1 I I 1 1 I IType Ili 24-hr
1 1 1 ; 100-Year, kainfall=7.03 '
1 1 R inbffAwea=1:110 at-
2 / 1 1 1 1 I I I I I 1 1 1
1 11 11 1 Runoff Volume=0.276 af
w / tu'n off 1Depth=;2.$9,'
1 1 1 1 Q
u_
✓ I I 1 I 1 RIdwlLength=114'
• 1 Tc=32.i3 m1n
1
11 0 N 61
/Milli ,, iiiiiiiii���liiiiiiiiiiJiii�iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii�,
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)

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 130
Hydrograph for Subcatchment 7S: Predevelolpment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.21 0.00 0.00
5.00 0.47 0.00 0.00
7.50 0.82 0.00 0.00
10.00 1.36 0.00 0.00
12.50 5.53 1.62 1.87
15.00 6.43 2.21 0.19
17.50 6.87 2.51 0.12
20.00 7.17 2.72 0.09
22.50 7.40 2.89 0.07
25.00 7.53 2.99 0.00
27.50 7.53 2.99 0.00
30.00 7.53 2.99 0.00
32.50 7.53 2.99 0.00
35.00 7.53 2.99 0.00
37.50 7.53 2.99 0.00
40.00 7.53 2.99 0.00
42.50 7.53 2.99 0.00
45.00 7.53 2.99 0.00
47.50 7.53 2.99 0.00
50.00 7.53 2.99 0.00
52.50 7.53 2.99 0.00
55.00 7.53 2.99 0.00
57.50 7.53 2.99 0.00
60.00 7.53 2.99 0.00
62.50 7.53 2.99 0.00
65.00 7.53 2.99 0.00
67.50 7.53 2.99 0.00
70.00 7.53 2.99 0.00
72.50 7.53 2.99 0.00
75.00 7.53 2.99 0.00
77.50 7.53 2.99 0.00
80.00 7.53 2.99 0.00
82.50 7.53 2.99 0.00
85.00 7.53 2.99 0.00
87.50 7.53 2.99 0.00
90.00 7.53 2.99 0.00
92.50 7.53 2.99 0.00
95.00 7.53 2.99 0.00
97.50 7.53 2.99 0.00
100.00 7.53 2.99 0.00
102.50 7.53 2.99 0.00
105.00 7.53 2.99 0.00
107.50 7.53 2.99 0.00
110.00 7.53 2.99 0.00
112.50 7.53 2.99 0.00
115.00 7.53 2.99 0.00
117.50 7.53 2.99 0.00
120.00 7.53 2.99 0.00

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 131
Summary for Subcatchment 8S: BYPASS 1
Runoff = 9.62 cfs @ 12.10 hrs, Volume= 0.679 af, Depth= 3.84"
Routed to Link 11 L : POST DEV
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 100-Year Rainfall=7.53"
Area (ac) CN Description
1.180 60 Woods, Fair, HSG B
0.130 73 Woods, Fair, HSG C
0.170 61 >75% Grass cover, Good, HSG B
0.120 74 >75% Grass cover, Good, HSG C
0.310 80 >75% Grass cover, Good, HSG D
0.080 98 Paved parking, HSG B
0.090 98 Paved parking, HSG C
0.040 98 Paved parking, HSG D
2.120 68 Weighted Average
1.910 90.09% Pervious Area
0.210 9.91% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) _ (feet) (ft/ft) (ft/sec) (cfs)
13.9 100 0.0734 0.12 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
3.8 249 0.0472 1.09 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.1 278 0.0398 37.88 454.62 Channel Flow,
Area= 12.0 sf Perim= 7.2' r= 1.67'
n= 0.011 Concrete pipe, straight & clean
17.8 627 Total

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 132
Subcatchment 8S: BYPASS 1
Hydrograph
11 1 1 1 1 1 1 1 1 1 1 1
-I 14 I 4 -I 17 I 1 I - - 1- -I- T -I 4 - ■Runoff
10 -/ 1 9.62 cts 1 1 1 1 1 1 1 1 1 1 1 1 1 1
4- H -i - I- H - 1- -1- -1- Type-II�24-hr� -
- - - 7 7 -I I- 7 -I T -1 a 11 I `I"'.•I I ai� ' 117 'al- -
8- / 1 I 1 1 I I Runoffmea=2.1-20_ad
71-' 1 I I I I I I I I I I I I I I I
- J _I 1 1 I 1 1 I Runoff VoIum1eQ.679af —
6� OLLngf 1DgpthT3.,04H"
o 5� / 1 1 1 I I 1 1 I FIbw Length=627'
4� I 1 1 I I I I I I I ITci;=17.18 min
y - -1 1 1- -1 - 1- 7 -I- T -I- 7 - - I- 7 - I- T —1—[.A'L
3- 1 1 1 1 1 1 1 1 1 �r'Y 16
2:-/
I 1 I 1 1 1 ' 1 1
1 1 1
: i
o
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)

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 133
Hydrograph for Subcatchment 8S: BYPASS 1
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.21 0.00 0.00
5.00 0.47 0.00 0.00
7.50 0.82 0.00 0.00
10.00 1.36 0.03 0.08
12.50 5.53 2.27 2.22
15.00 6.43 2.95 0.40
17.50 6.87 3.30 0.26
20.00 7.17 3.55 0.18
22.50 7.40 3.74 0.16
25.00 7.53 3.84 0.00
27.50 7.53 3.84 0.00
30.00 7.53 3.84 0.00
32.50 7.53 3.84 0.00
35.00 7.53 3.84 0.00
37.50 7.53 3.84 0.00
40.00 7.53 3.84 0.00
42.50 7.53 3.84 0.00
45.00 7.53 3.84 0.00
47.50 7.53 3.84 0.00
50.00 7.53 3.84 0.00
52.50 7.53 3.84 0.00
55.00 7.53 3.84 0.00
57.50 7.53 3.84 0.00
60.00 7.53 3.84 0.00
62.50 7.53 3.84 0.00
65.00 7.53 3.84 0.00
67.50 7.53 3.84 0.00
70.00 7.53 3.84 0.00
72.50 7.53 3.84 0.00
75.00 7.53 3.84 0.00
77.50 7.53 3.84 0.00
80.00 7.53 3.84 0.00
82.50 7.53 3.84 0.00
85.00 7.53 3.84 0.00
87.50 7.53 3.84 0.00
90.00 7.53 3.84 0.00
92.50 7.53 3.84 0.00
95.00 7.53 3.84 0.00
97.50 7.53 3.84 0.00
100.00 7.53 3.84 0.00
102.50 7.53 3.84 0.00
105.00 7.53 3.84 0.00
107.50 7.53 3.84 0.00
110.00 7.53 3.84 0.00
112.50 7.53 3.84 0.00
115.00 7.53 3.84 0.00
117.50 7.53 3.84 0.00
120.00 7.53 3.84 0.00

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 134
Summary for Subcatchment 9S: Postdevelopment Point 2
Runoff = 2.59 cfs @ 12.24 hrs, Volume= 0.249 af, Depth= 2.99"
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 100-Year Rainfall=7.53"
Area (ac) CN Description
1.000 60 Woods, Fair, HSG B
1.000 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.5 93 0.0106 0.05 Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 2.68"
Subcatchment 9S: Postdevelopment Point 2
Hydrograph
/ II I I I I I I I I
I I I I I I I I I I I ❑Runoff
12.59 cfs l l I I I I I I I I I I
2 1 I I I I I I I I 1 Type II 24-hr
/ 11 I 1 i I 1 ; 10O-rlYear, klainfaII71r7.153 '
2-- / — I- 7 T —I — r — RunbfiAtea=l-VVOarc
/ 11 1 1 Runoff Volume=0.249 af
/ 1 1 1 I I Ou;ngff,Depth=2.$911'
I
/ 11 I 1 FIovV Length=93'
LL * �r
11 II 1 I 1 I I 1 I I 1 1� Slope=0.0 106-
1 Tc285 mi l
/ = . 1 ri
CN=60
o /, „....,.,15 20 25 30 35,/ ���,/����45 40 ��������55 0 ����60����65����70����������75 80 ���,/�����������������������
0 5 10 5 85 90 95 100 105 110 115 120
Time (hours)

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 135
Hydrograph for Subcatchment 9S: Postdevelopment Point 2
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
2.50 0.21 0.00 0.00
5.00 0.47 0.00 0.00
7.50 0.82 0.00 0.00
10.00 1.36 0.00 0.00
12.50 5.53 1.62 1.47
15.00 6.43 2.21 0.17
17.50 6.87 2.51 0.11
20.00 7.17 2.72 0.08
22.50 7.40 2.89 0.07
25.00 7.53 2.99 0.00
27.50 7.53 2.99 0.00
30.00 7.53 2.99 0.00
32.50 7.53 2.99 0.00
35.00 7.53 2.99 0.00
37.50 7.53 2.99 0.00
40.00 7.53 2.99 0.00
42.50 7.53 2.99 0.00
45.00 7.53 2.99 0.00
47.50 7.53 2.99 0.00
50.00 7.53 2.99 0.00
52.50 7.53 2.99 0.00
55.00 7.53 2.99 0.00
57.50 7.53 2.99 0.00
60.00 7.53 2.99 0.00
62.50 7.53 2.99 0.00
65.00 7.53 2.99 0.00
67.50 7.53 2.99 0.00
70.00 7.53 2.99 0.00
72.50 7.53 2.99 0.00
75.00 7.53 2.99 0.00
77.50 7.53 2.99 0.00
80.00 7.53 2.99 0.00
82.50 7.53 2.99 0.00
85.00 7.53 2.99 0.00
87.50 7.53 2.99 0.00
90.00 7.53 2.99 0.00
92.50 7.53 2.99 0.00
95.00 7.53 2.99 0.00
97.50 7.53 2.99 0.00
100.00 7.53 2.99 0.00
102.50 7.53 2.99 0.00
105.00 7.53 2.99 0.00
107.50 7.53 2.99 0.00
110.00 7.53 2.99 0.00
112.50 7.53 2.99 0.00
115.00 7.53 2.99 0.00
117.50 7.53 2.99 0.00
120.00 7.53 2.99 0.00

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 136
Summary for Pond 12P: POND
[44] Hint: Outlet device#2 is below defined storage
Inflow Area = 2.340 ac, 48.29% Impervious, Inflow Depth = 5.30" for 100-Year event
Inflow = 21.41 cfs @ 11.95 hrs, Volume= 1.034 af
Outflow = 5.36 cfs @ 12.11 hrs, Volume= 1.034 af, Atten= 75%, Lag= 9.3 min
Primary = 5.36 cfs @ 12.11 hrs, Volume= 1.034 of
Routed to Link 11 L : POST DEV
Secondary= 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to Link 11 L : POST DEV
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 580.97'@ 12.11 hrs Surf.Area= 7,264 sf Storage= 21,252 cf
Plug-Flow detention time=289.9 min calculated for 1.034 af(100% of inflow)
Center-of-Mass det. time=289.6 min ( 1,088.3 - 798.7 )
Volume Invert Avail.Storage Storage Description
#1 577.00' 38,262 cf Custom Stage Data (Prismatic)Listed below(Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
577.00 3,579 0 0
578.00 4,438 4,009 4,009
579.00 5,335 4,887 8,895
580.00 6,289 5,812 14,707
581.00 7,299 6,794 21,501
582.00 8,366 7,833 29,334
583.00 9,490 8,928 38,262
Device Routing Invert Outlet Devices
#1 Primary 575.50' 15.0" Round Culvert
L= 57.4' RCP, rounded edge headwall, Ke= 0.100
Inlet/ Outlet Invert= 575.50'/ 573.63' S= 0.0326 '/' Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 1.23 sf
#2 Device 1 575.50' SAND FILTER
Head (feet) 0.00 1.00 1.50 2.50 3.50 4.50 5.50 6.50
Disch. (cfs) 0.000 0.052 0.060 0.077 0.095 0.112 0.129 0.146
#3 Device 1 578.21' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#4 Device 1 578.89' 15.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1 579.63' 6.0" W x 3.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#6 Device 1 580.18' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#7 Device 1 580.80' 2.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32
#8 Device 1 581.00' 3.0' long x 0.5' breadth Broad-Crested Rectangular Weir X 4.00
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 137
#9 Secondary 582.00' 20.0' long x 16.0' breadth EMERGENCY SPILLWAY
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=5.27 cfs @ 12.11 hrs HW=580.96' (Free Discharge)
-1=Culvert (Passes 5.27 cfs of 15.55 cfs potential flow)
-2=SAND FILTER (Custom Controls 0.13 cfs)
-3=Orifice/Grate (Orifice Controls 0.27 cfs @ 7.83 fps)
-4=Orifice/Grate (Orifice Controls 2.10 cfs @ 6.71 fps)
-5=Orifice/Grate (Orifice Controls 0.66 cfs @ 5.28 fps)
-6=Orifice/Grate (Orifice Controls 0.69 cfs @ 3.50 fps)
-7=Broad-Crested Rectangular Weir(Weir Controls 1.43 cfs @ 1.12 fps)
-8=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=577.00' (Free Discharge)
4-9=EMERGENCY SPILLWAY( Controls 0.00 cfs)
Pond 12P: POND
Hydrograph
1 1 1 1
I1 -1 -1_ - - - 1 _I _I_ � 1 - - - � � -I- I- L _ ❑Inflow
/ 121.41 cfs I Outflow
/�_,. ❑Primary
1 1 Iow IAr eaZ2 i3- O lac ❑Secondary
22� / /' 1 - I- + -1- I- + -1 -1 p6nit 01" -48 1"'47
- / , 1 1 1 1 1 I
2°� 1 1 Stoi-ae=211252' c'f
18 - / / I -1 -1- - r -1 -1- r r 1- r �' -1- 1- r -
/ - 1 L _I I _L A I L 1 _1 _ 1_ L _L I 1 L -
161-/ / /I
N 141-' / /1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
=- - / / -I - I- L -I -1- 1- LA -I- 14 -1 - 1- LH -1- 1- L -
c 12 / /
: / I I I I I I I I I I I I I I I I I I
LL 10 -/ / /1 I I I I I I I I I I I 1 1 1 1 1 1 1
- / /
8- / 5.36cfs -I/ /15.36 cfs�
67-/ / /I / 1 1 1 1 1 1 1 1 1 1 I 1 1 1 1 1 1 1 1 1 1
/ / '%
2� //.� ���%////////////////////////////////////////////////////////////////////////////
o /l�l/ll/l/l// /
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)

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 138
Pond 12P: POND
Stage-Discharge
I I I I ❑Total
583 ❑Primary
❑Secondary
EMERGENCY SPILLWAY
582 I I �� I
/�// % I I
*/� Broad-Crested Rectangular Weir
Broad-Crested Rectangular Weir I I
581 / I
5 Orifice/Grate I
f I
c 580 / �0 Orifice/Grate I
/ I I I I I
I I
Orifice/Grate
w I
579 7 I
Orifice/Grate I I
578 O% I I
i i / / i i i i
/ i i i i
/ / / / i
577 , , , , „ , , „ , , . , (, . . • (. . (. . . .
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Discharge (cfs)
Pond 12P: POND
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 500 1,000 1,500 2,000 2,500 3,000 3,5004,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 0 Surface
. . ' . . . ! . . . ' . . .
. . . ! . . . I . ( . I . . . ! . . . I . . . I . . . 1 , , . I . . . ' . . . 1 . . . I . . . ' . . . ! . . . ❑Storage
583� I I I II I I I . .I I 7
I I I II I I I I II /
I 1 1 I I I I II I I I I I I I
582 I I I ////' II I I I
1 I I I �� I I 1 ////��� I I I I I
' ,, I I I II I I I
581-
1 z,__a H I_L _L 11 I JH H
I , I II I I II I I I
a 580- I I I I .. "/ . 1 I II I I I I II I I I
d - — I H + + I -11 I i+ r 1+ + + II 1 -[ r +
w - I I I I II I II I II
579-"
I I II I 1 1 I II I I I
- n — r r 1- I tt 1 —Ill — + II 1 rt r r
578
11 I I I II I I I
/ / /
/
- Custom Stage Data / z / /
577
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000
Storage(cubic-feet)

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 139
Hydrograph for Pond 12P: POND
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 577.00 0.00 0.00 0.00
2.50 0.00 0 577.00 0.00 0.00 0.00
5.00 0.00 0 577.00 0.00 0.00 0.00
7.50 0.09 190 577.05 0.05 0.05 0.00
10.00 0.32 1,265 577.34 0.07 0.07 0.00
12.50 1.67 19,151 580.67 3.35 3.35 0.00
15.00 0.50 10,058 579.21 0.91 0.91 0.00
17.50 0.32 8,845 578.99 0.36 0.36 0.00
20.00 0.22 8,518 578.93 0.26 0.26 0.00
22.50 0.20 8,295 578.89 0.22 0.22 0.00
25.00 0.00 7,469 578.73 0.20 0.20 0.00
27.50 0.00 5,956 578.42 0.14 0.14 0.00
30.00 0.00 5,021 578.22 0.08 0.08 0.00
32.50 0.00 4,304 578.07 0.08 0.08 0.00
35.00 0.00 3,613 577.91 0.08 0.08 0.00
37.50 0.00 2,946 577.75 0.07 0.07 0.00
40.00 0.00 2,302 577.60 0.07 0.07 0.00
42.50 0.00 1,682 577.45 0.07 0.07 0.00
45.00 0.00 1,086 577.29 0.06 0.06 0.00
47.50 0.00 512 577.14 0.06 0.06 0.00
50.00 0.00 66 577.02 0.02 0.02 0.00
52.50 0.00 5 577.00 0.00 0.00 0.00
55.00 0.00 0 577.00 0.00 0.00 0.00
57.50 0.00 0 577.00 0.00 0.00 0.00
60.00 0.00 0 577.00 0.00 0.00 0.00
62.50 0.00 0 577.00 0.00 0.00 0.00
65.00 0.00 0 577.00 0.00 0.00 0.00
67.50 0.00 0 577.00 0.00 0.00 0.00
70.00 0.00 0 577.00 0.00 0.00 0.00
72.50 0.00 0 577.00 0.00 0.00 0.00
75.00 0.00 0 577.00 0.00 0.00 0.00
77.50 0.00 0 577.00 0.00 0.00 0.00
80.00 0.00 0 577.00 0.00 0.00 0.00
82.50 0.00 0 577.00 0.00 0.00 0.00
85.00 0.00 0 577.00 0.00 0.00 0.00
87.50 0.00 0 577.00 0.00 0.00 0.00
90.00 0.00 0 577.00 0.00 0.00 0.00
92.50 0.00 0 577.00 0.00 0.00 0.00
95.00 0.00 0 577.00 0.00 0.00 0.00
97.50 0.00 0 577.00 0.00 0.00 0.00
100.00 0.00 0 577.00 0.00 0.00 0.00
102.50 0.00 0 577.00 0.00 0.00 0.00
105.00 0.00 0 577.00 0.00 0.00 0.00
107.50 0.00 0 577.00 0.00 0.00 0.00
110.00 0.00 0 577.00 0.00 0.00 0.00
112.50 0.00 0 577.00 0.00 0.00 0.00
115.00 0.00 0 577.00 0.00 0.00 0.00
117.50 0.00 0 577.00 0.00 0.00 0.00
120.00 0.00 0 577.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 140
Stage-Discharge for Pond 12P: POND
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
577.00 0.00 0.00 0.00 582.20 21.86 17.06 4.79
577.10 0.06 0.06 0.00 582.30 26.02 17.18 8.84
577.20 0.06 0.06 0.00 582.40 30.96 17.29 13.66
577.30 0.07 0.07 0.00 582.50 36.50 17.41 19.09
577.40 0.07 0.07 0.00 582.60 42.62 17.52 25.10
577.50 0.07 0.07 0.00 582.70 48.91 17.64 31.27
577.60 0.07 0.07 0.00 582.80 55.53 17.75 37.78
577.70 0.07 0.07 0.00 582.90 62.86 17.86 45.00
577.80 0.07 0.07 0.00 583.00 70.57 17.97 52.60
577.90 0.08 0.08 0.00
578.00 0.08 0.08 0.00
578.10 0.08 0.08 0.00
578.20 0.08 0.08 0.00
578.30 0.10 0.10 0.00
578.40 0.13 0.13 0.00
578.50 0.16 0.16 0.00
578.60 0.18 0.18 0.00
578.70 0.19 0.19 0.00
578.80 0.21 0.21 0.00
578.90 0.22 0.22 0.00
579.00 0.38 0.38 0.00
579.10 0.63 0.63 0.00
579.20 0.89 0.89 0.00
579.30 1.06 1.06 0.00
579.40 1.20 1.20 0.00
579.50 1.33 1.33 0.00
579.60 1.44 1.44 0.00
579.70 1.57 1.57 0.00
579.80 1.75 1.75 0.00
579.90 1.95 1.95 0.00
580.00 2.11 2.11 0.00
580.10 2.25 2.25 0.00
580.20 2.38 2.38 0.00
580.30 2.54 2.54 0.00
580.40 2.74 2.74 0.00
580.50 2.97 2.97 0.00
580.60 3.21 3.21 0.00
580.70 3.41 3.41 0.00
580.80 3.58 3.58 0.00
580.90 4.46 4.46 0.00
581.00 5.91 5.91 0.00
581.10 8.87 8.87 0.00
581.20 13.10 13.10 0.00
581.30 15.98 15.98 0.00
581.40 16.10 16.10 0.00
581.50 16.23 16.23 0.00
581.60 16.35 16.35 0.00
581.70 16.47 16.47 0.00
581.80 16.59 16.59 0.00
581.90 16.71 16.71 0.00
582.00 16.83 16.83 0.00
582.10 18.64 16.95 1.69

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 141
Stage-Area-Storage for Pond 12P: POND
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
577.00 3,579 0 582.20 8,591 31,029
577.10 3,665 362 582.30 8,703 31,894
577.20 3,751 733 582.40 8,816 32,770
577.30 3,837 1,112 582.50 8,928 33,657
577.40 3,923 1,500 582.60 9,040 34,555
577.50 4,009 1,897 582.70 9,153 35,465
577.60 4,094 2,302 582.80 9,265 36,386
577.70 4,180 2,716 582.90 9,378 37,318
577.80 4,266 3,138 583.00 9,490 38,262
577.90 4,352 3,569
578.00 4,438 4,009
578.10 4,528 4,457
578.20 4,617 4,914
578.30 4,707 5,380
578.40 4,797 5,855
578.50 4,887 6,340
578.60 4,976 6,833
578.70 5,066 7,335
578.80 5,156 7,846
578.90 5,245 8,366
579.00 5,335 8,895
579.10 5,430 9,433
579.20 5,526 9,981
579.30 5,621 10,538
579.40 5,717 11,105
579.50 5,812 11,682
579.60 5,907 12,268
579.70 6,003 12,863
579.80 6,098 13,468
579.90 6,194 14,083
580.00 6,289 14,707
580.10 6,390 15,341
580.20 6,491 15,985
580.30 6,592 16,639
580.40 6,693 17,303
580.50 6,794 17,978
580.60 6,895 18,662
580.70 6,996 19,357
580.80 7,097 20,061
580.90 7,198 20,776
581.00 7,299 21,501
581.10 7,406 22,236
581.20 7,512 22,982
581.30 7,619 23,739
581.40 7,726 24,506
581.50 7,833 25,284
581.60 7,939 26,072
581.70 8,046 26,872
581.80 8,153 27,682
581.90 8,259 28,502
582.00 8,366 29,334
582.10 8,478 30,176

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 142
Summary for Link 6L: PRE DEV
Inflow Area = 4.340 ac, 4.61% Impervious, Inflow Depth = 3.52" for 100-Year event
Inflow = 13.75 cfs @ 12.22 hrs, Volume= 1.272 af
Primary = 13.75 cfs @ 12.22 hrs, Volume= 1.272 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 6L: PRE DEV
Hydrograph
L I L I I 1 1 r L 1 1 I L J 1 L J I L I L L I -
I I I I I I I I I I I I I I I I I I I I I I ■Inflow
15i-/ / Ar 113.75 cfs 1 I I I I I I I I I I I I I I I I I I I I ❑Primary
14 -/ 13 i s I I I I I In fflolw Ared=4.I3407aC
13 -z z z- + -1 - '- + -I- r1 - 1 T 1 1- 1 1 -r1 1 T 1 1- 1 1
124 � � - - + - - - - - � � - - - - HH - I-
I 1 1 I 1 I 1 I 1 1 I 1 1 1
11 -/ /
10 -/ / 1 I I I I I 1 1 I I I I
8y fi - - 1- -1- 1- -1 - 1- T 1 - - -1 1- fiH 1- T -1 r - - -
33 7y _L -1- 1- _1 - 1- 1 -1 - I- _1 -1- _1 - 1- _L -1 - 1
Li- - / 1 I I I I I I I I 1 1 I
6' / I I I I I I I I I I I 1 I 1 1 1
54z / ^ I I I I I I I I I I I 1 I I I I
4y ' - T 1 I- J -1- r T - 1- T 1 - I -1 1- T -I1- T -I T T
3� / k - 1 -1 - '- 4 —1— I— H — 1— + 1 — I— H —I— H H — 1— H -I - H H - - -
2� z � I J - 1- 1 -1 - I_ J -1- LJ - 1- 1 _ I
_� 1 I 1 1 I 1 1 I I I 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)

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 143
Hydrograph for Link 6L: PRE DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.00 0.00 0.00
10.00 0.07 0.00 0.07
12.50 7.25 0.00 7.25
15.00 0.81 0.00 0.81
17.50 0.51 0.00 0.51
20.00 0.36 0.00 0.36
22.50 0.31 0.00 0.31
25.00 0.01 0.00 0.01
27.50 0.00 0.00 0.00
30.00 0.00 0.00 0.00
32.50 0.00 0.00 0.00
35.00 0.00 0.00 0.00
37.50 0.00 0.00 0.00
40.00 0.00 0.00 0.00
42.50 0.00 0.00 0.00
45.00 0.00 0.00 0.00
47.50 0.00 0.00 0.00
50.00 0.00 0.00 0.00
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 144
Summary for Link 11 L: POST DEV
Inflow Area = 4.460 ac, 30.04% Impervious, Inflow Depth = 4.61" for 100-Year event
Inflow = 14.98 cfs @ 12.11 hrs, Volume= 1.713 of
Primary = 14.98 cfs @ 12.11 hrs, Volume= 1.713 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 11 L: POST DEV
Hydrograph
I I I 1 1 1 1 1
� I I I I I I I I I I I I I I ❑ Inflow
14.98 cfs I ❑Primary
16� � I I 7 I � � I � I I I T I T e d�+�/��,
J,a.98crs j —I — 1 rt 1— r rt —1 T 1 —In f Iowi-Area=4.46V la�i -
15� , v
14� � 1- -h -1- i- -h -I- + -1 1 1 1 1 1
13 , /—
I- 4 -1— I— —I -1- 4 -1 - 1- —I -1— H -1 - 1- 4 -1- 1 - -
1— 1 —1— L J — 1— 1 —1 — I— J —1— L J — 1— 1 —1 — L J -
12' "/ 1 1 1 1 1 1 1 1 1 1 1 I I I I
11� / III I I I 1 I 1 I 1 I 1 I I I I
101 /— 1 1 1 1 1 1 1 1 1 1 I I I I
u
94 z /— 1 1 1 1 1 1 1 1 1 1 1 1 1 1
0 84' /— I I I I 1 I 1 I 1 I 1 1 1 1 1
T. 7 J I L H 1 T I I H I T 1 1 T I F H I
64 r 1— rt -1— rrt -1- -r -1 - 1— rt -1— r - - 1- 1 1 1
k 1— H —I— H H —I— + —1 — H H —I— t H — I— t —I — H H — I— -
5 -/ ,
4 —1— I— —I —1— 4 —1 — 1— —I —1— - - 1- 4 -1- 1— - - 1
4 1 —1— L J —1— 1 —1 — 1— _I —1— J J — 1— 1 —1 — L J -
hill!
1- , ��� ZZZZ��������������/ / �Sf is 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)

54647 - Drainage_Pre-Post Type II 24-hr 100-Year Rainfall=7.53"
Prepared by Timmons Group Printed 10/26/2023
HydroCAD® 10.10-7a s/n 08663 ©2021 HydroCAD Software Solutions LLC Page 145
Hydrograph for Link 11 L: POST DEV
Time Inflow Elevation Primary
(hours) (cfs) (feet) (cfs)
0.00 0.00 0.00 0.00
2.50 0.00 0.00 0.00
5.00 0.00 0.00 0.00
7.50 0.05 0.00 0.05
10.00 0.14 0.00 0.14
12.50 5.57 0.00 5.57
15.00 1.32 0.00 1.32
17.50 0.62 0.00 0.62
20.00 0.44 0.00 0.44
22.50 0.37 0.00 0.37
25.00 0.20 0.00 0.20
27.50 0.14 0.00 0.14
30.00 0.08 0.00 0.08
32.50 0.08 0.00 0.08
35.00 0.08 0.00 0.08
37.50 0.07 0.00 0.07
40.00 0.07 0.00 0.07
42.50 0.07 0.00 0.07
45.00 0.06 0.00 0.06
47.50 0.06 0.00 0.06
50.00 0.02 0.00 0.02
52.50 0.00 0.00 0.00
55.00 0.00 0.00 0.00
57.50 0.00 0.00 0.00
60.00 0.00 0.00 0.00
62.50 0.00 0.00 0.00
65.00 0.00 0.00 0.00
67.50 0.00 0.00 0.00
70.00 0.00 0.00 0.00
72.50 0.00 0.00 0.00
75.00 0.00 0.00 0.00
77.50 0.00 0.00 0.00
80.00 0.00 0.00 0.00
82.50 0.00 0.00 0.00
85.00 0.00 0.00 0.00
87.50 0.00 0.00 0.00
90.00 0.00 0.00 0.00
92.50 0.00 0.00 0.00
95.00 0.00 0.00 0.00
97.50 0.00 0.00 0.00
100.00 0.00 0.00 0.00
102.50 0.00 0.00 0.00
105.00 0.00 0.00 0.00
107.50 0.00 0.00 0.00
110.00 0.00 0.00 0.00
112.50 0.00 0.00 0.00
115.00 0.00 0.00 0.00
117.50 0.00 0.00 0.00
120.00 0.00 0.00 0.00