SWA000112_Stormwater Report_20210714

CULVERT & SD DESIGN
CALCULATIONS
BROTHERS ESTATE
Harrisburg, North Carolina
Prepared for. -
IN SITU STUDIO
Prepared By.
d r
000 associates
master planning. civil engineering
urban design. landscape archltecrure
0 hawthorns In. charlotte, nc 28204
704. .1204 . wwwAprossodates.net
NC Eng. Finn Ucen :e # C-0560
DPR Project No.:
20055 June 30, 2021
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06-30-2021
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BROTHERS ESTATE
TABLE OF CONTENTS
II. CULVERT DESIGN CALCULATIONS
- Time of Concentration Map
- Harrisburg Zoning Map
- Soil Map
- Curve Number
- Precipitation Frequency
- Rainfall Intensity
- Hydrograph Report
- Culvert Profile (2-yr, 10-yr, 25-yr,
50-yr, 100-yr)
- Hw/D Chart

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BROTHERS ESTATE I CULVERT TIME OF CONCENTRATION EXHIBIT
HARRISBURG, NORTH CAROLINA
DATE: 04.30.2021 CLIENT: IN SITU STUDIO
PROJ #: 20055 DRAWN BY: MT
PLOTTED: C:\DPR Dropbox\—Projecis\Aclive\2020\20055 Brothers Estate—Insitu Studio— Ccbcrrus\CAD\BASE IT LES\SI TE \20055— BASE SD,dwg / 5/1/2021 2:23 PM
dE&OWI& m0o**
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master planning . civil engineering
urban design.landscape architecture

APPENDIX A: EXISTING CONDITIONS
DECEMBER 11, 2017
Harrisburg Zoning
Neighborhood
Rural Estate
■
Residential Low density
■
Light Commercial and
Office
Residential Medium
Density
Residential Village
ry
Residential Compact
PAP 11,
Planned Unit Development
■ Public Interest
Office -Institutional
Figure 14. Adopted Zoning Map
Count
side Residential
�S
Low Density Residential
Officellnstitutional
General Commercial
Limited Industrial
General Industrial
HARRISBURG NORTH CAROLINA

[GYM` IN
Cabarrus County Property Report
z
https://location.cabarruscounty.us/mapcabarrus/ 1/2

1019MIN
Cabarrus County Property Report
Cabarrus County shall not be held liable for any errors in the data represented on this record. This includes errors of omission, commission, concerning the content of the data, and relative
positional accuracy of the
data. The data cannot be construed to be a legal document. Primary sources from which this data was compiled must be consulted forverification of information
represented on this map document.
Physical Address:
10595 HICKORY RIDGE RD HARRISBURG NC 28075
PIN14:
55157667990000
Account Name 1:
BROTHERS COLIN
Account Name 2:
BROTHERS ERICA WF
Mailing Address:
2100 HEADWATER LN
Mailing City:
AUSTIN
Mailing State:
TX
Mailing Zip Code:
78746
Property Real ID:
01-029-0001.00
Plat Book:
00000
Plat Page:
00000
Land Units:
51.75
Units Type:
AC
Land Value:
AC
Building Value:
82290
OBXF Value:
560
Assessed Value:
139140
Market Value:
918410
Sale Year:
2020
Sale Month:
10
Sale Price:
725000
Deed Book:
14607
Deed Page:
0093
Fire District:
HarrisburgRural
Zoning:
CR
Elementary School:
Patriot ES
Middle School:
Hickory Ridge MS
High School:
Hickory Ridge HS
Precinct Name:
01-02
Legal Description:
EAST SIDE HICKORY RIDGE RD
Floodway:
No
100 Yr Flood:
No
500 Yr Flood:
No
Watershed
undefined
FIRM Panel Number
5515
https://location.cabarruscounty.us/mapcabarrus/ 2/2

534100
35o 16' 13" N g
g
r
Hydrologic Soil Group—Cabarrus County, North Carolina
(2021-04-30_20055-HSG Soil Map)
5342M 5343W 5344W 5345W 534600
Soil MaN may not he valid at this scale.
35o 15' 43" N
534100 534200 534300 534400 534500
Map Scale: 1:4,620 if printed on A portrait (8.5" x 11") sheet.
Meters
$ N 0 50 100 200 300
AFeet
0 200 400 800 1200
Map projection: Web Mercator Comer coordinates: WGS84 Edge tics: lfrM Zone 17N WGS84
USDA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
534700
g 35o 16' 13" N
35o 15' 43" N
534700
5/1 /2021
Pagel of 4

Hydrologic Soil Group—Cabarrus County, North Carolina
(2021-04-30_20055-HSG Soil Map)
MAP LEGEND
Area of Interest (AOI)
0
Area of Interest (AOI)
Soils
Soil Rating
Polygons
0
A
0
A/D
0
B
0
B/D
0
C
0
C/D
0
D
0
Not rated or not available
Soil Rating
Lines
r 0
A
r 0
A/D
B
r
B/D
N 0
C
r 0
C/D
r 0
D
r 0
Not rated or not available
Soil Rating
Points
0
A
0
A/D
0
B
0
B/D
❑ C
0 C/D
0 D
❑ Not rated or not available
Water Features
Streams and Canals
Transportation
— Rails
­0 Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
MAP INFORMATION
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Cabarrus County, North Carolina
Survey Area Data: Version 19, Jun 2, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Nov 6, 2019—Nov
20, 2019
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
USDA Natural Resources Web Soil Survey 5/1/2021
Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group—Cabarrus County, North Carolina
2021-04-30_20055-HSG Soil Map
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
ChA
Chewacla sandy loam, 0
to 2 percent slopes,
frequently flooded
B/D
2.6
4.3%
EnB
Enon sandy loam, 2 to 8
percent slopes
C
2.6
4.2%
EnD
Enon sandy loam, 8 to
15 percent slopes
C
10.4
16.9%
IdB
Iredell loam, 2 to 6
percent slopes
C/D
22.0
35.9%
SfB
Sedgefield sandy loam,
2 to 8 percent slopes
C/D
23.7
38.7%
Totals for Area of Interest
61.3
100.0%
USDA Natural Resources Web Soil Survey 5/1/2021
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group—Cabarrus County, North Carolina
2021-04-30_20055-HSG Soil Map
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
USDA Natural Resources Web Soil Survey 5/1/2021
Conservation Service National Cooperative Soil Survey Page 4 of 4

Project: Brothers Estate DPR ASSOCIATES, INC Prepared by: MT
DPR Job No.: 20055 RUN-OFF CURVE NUMBER Checked by: HN
Location: Harrisburg, Cabarrus County, NC CULVERT DESIGN Date: 04-30-2021
Total Drain. Area (Ac.)
61.3
Percentage
Site Soil Type
Soil Grouo
of Basin
ChA
B/D
4.3
EnB, EnD
C
21.1
IdB, SfB
C/D
74.6%
Hydrologic Soil Group Used
Percent of CN for
Weighted
CN for
Weighted
CN for
Weighted
Total
Weighted
Land Use
No. Acres Drainage Area Group B/D
CN
Group C
CN
Group CID
CN
Weighted CN
CN
Woods (Fair Condition)
8.4 13.7% 67
2.9
70
14.8
74
54.8
72.5
9.9
Countryside Residential (1 acre)
6.8 11.1 % 76
3.3
79
16.7
82
60.8
80.7
9.0
Open Space (Fair Condition)
46.1 75.2% 77
3.3
79
16.7
82
60.8
80.8
60.7
61.3 100%
.. 1 80 USED
79.6
C. OPR Dropboxl_Pr jects1Activel2020120055 Brothers Estate-hudu Studio-Caba—iCALCMSTORMrEOCUL VERT DESIGM20055-CN Culven..xls Sheet 1 of2

Project: Brothers Estate DPR ASSOCIATES, INC Prepared by: MT
DPR Job No.: 20055 RUN-OFF CURVE NUMBER Checked by: HN
Location: Harrisburg, Cabarrus County, NC CULVERT DESIGN Date: 04-30-2021
Total Drain. Area (Ac.)
61.3
Percentage
Site Sal Type
Soil Grouo
of Basin
ChA
B/D
4.3
EnB, EnD
C
21.1
IdB, SfB
C/D
74.6%
Hydrologic Soil Group Used
Percent of CN for Weighted CN for Weighted CN for Weighted Total Weighted
Land Use No. Acres Drainage Area Group B/D CN Group C CN Group C/D CN Weighted CN CN
Countryside Residential (1 acre) 61.3 100.0% 76 3.3 79 16.7 82 60.8 80.7 80.7
Total 61.3 0�
Composite Curve Number (CN): ai 1 81 USED
CADPR Dropboxl_PnjectslActivel2o2o120055 Brothers Estate-bSiN Studio-Caba—iCALCSISTORMrECICUL VERT DESIGN120055-CNCu1vert.xis Sheet 2 of2

Precipitation Frequency Data Server
NOAA Atlas 14, Volume 2, Version 3
Location name: Harrisburg, North Carolina, USA* � 'in°
Latitude: 35.2707°, Longitude:-80.6195°
Elevation: 612.37 ft**
*source: ESRI Maps
source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
Duration
Average recurrence interval (years)
1
2
5
10
25
50
1 100
100
200
500
1000
0.404
0.477
0.556
0.611
0.674
0.717
0.756
0.790
0.828
0.854
5-min
(0.373-0.438)
(0.440-0.519)
(0.511-0.604)
(0.561-0.663)
(0.616-0.730)
(0.652-0.776)
(0.685-0.818)
(0.712-0.856)
(0.739-0.898)
(0.756-0.928)
0.645
0.763
0.890
0.978
1.07
1.14
1.20
1.25
1.31
1.35
10-min
(0.595-0.700)
(0.704-0.830)
(0.818-0.967)
(0.897-1.06)
(0.982-1.16)
1 (1.04-1.24)
1 (1.09-1.30)
1 (1.13-1.36)
1 (1.17-1.42)
1 (1.19-1.46)
0.807
0.960
1.13
1.24
1.36
1.45
1.52
1.58
1.65
1.69
15-min
(0.744-0.875)
(0.885-1.04) 1
1 (1.25-1.47)
(1.32-1.57)
1 (1.38-1.64)
1 (1.42-1.71)
1 (1.47-1.79)
1 (1.49-1.84)
1.11
1.33
1.60
1.79
2.02
2.18
2.33
2.46
2.62
2.73
30-min
(1.02-1.20)
(1.22-1.44)
(1.47-1.74)
(1.64-1.94)
(1.84-2.18)
(1.98-2.36)
(2.11-2.52)
(2.22-2.66)
(2.34-2.85)
(2.42-2.97)
1.38
1.66
2.05
2.33
2.69
2.95
3.20
3.45
3.76
3.99
60-min
(1.27-1.50) 11
(1.53-1.81)
(1.89-2.23)
(2.14-2.53)
(2.46-2.91)
(2.69-3.19)
(2.90-3.47)
(3.11-3.74)
(3.36-4.08)
(3.53-4.34)
1.60
1.94
2.40
2.75
3.21
3.55
3.89
4.22
4.66
4.99
2-hr
(1.47-1.75) 11
(1.77-2.12) 11
(2.20-2.62) 1
(2.91-3.49)
(3.21-3.86)
(3.49-4.23)
(3.77-4.60)
(4.11-5.09)
(4.36-5.45)
1.71
2.06
2.57
2.97
3.49
3.91
4.32
4.75
5.33
5.78
3-hr
(1.57-1.87)1
(1.89-2.26)
1 (2.71-3.24) 11
(3.17-3.81)
1 (3.53-4.26)
1 (3.88-4.71)
1 (4.22-5.1 7)
1 (4.67-5.81)
1 (5.01-6.32)
2.06
2.48
3.10
3.59
4.24
4.76
5.28
5.82
6.57
7.15
6-hr
(1.89-2.26) 11
(2.28-2.72) 11
(2.84-3.40) 11
(3.28-3.92) 11
(3.85-4.61)
1 (4.29-5.17)
1 (4.73-5.74)
1 (5.16-6.33)
1 (5.74-7.13)
1 (6.17-7.77)
2.44
2.95
3.70
4.29
5.11
5.77
6.45
7.16
8.15
8.94
12-hr
(2.25-2.67)
(2.71-3.23) 11
(3.39-4.04) 11
(3.93-4.69) 11
(4.64-5.57)
1 (5.20-6.27)
1 (5.76-7.00)
1 (6.32-7.76)
1 (7.07-8.82)
1 (7.65-9.68)
2.88
3.47
4.36
6.06
6.01
6.76
7.54
8.33
9.42
10.3
24-hr
(2.67-3.10) 1
1 (4.05-4.71) 11
(4.69-5.46) 11
(5.55-6.47)
1 (6.24-7.28)
1 (6.93-8.11)
1 (7.64-8.98)
1 (8.60-10.2)
1 (9.36-11.1)
3.38
4.07
5.07
5.86
6.93
7.78
8.65
9.54
10.8
11.7
2-day
(3.14-3.63) 11
(3.78-4.38) 11
(4.71-5.46) 11
(5.43-6.30) 11
(6.41-7.44)
1 (7.17-8.36)
1 (7.95-9.29)
1 (8.75-10.3)
1 (9.83-11.6)
1 (10.7-12.6)
3.58
4.30
5.34
6.15
7.26
8.14
9.04
9.97
11.2
12.2
3-day
(3.33-3.84) 11
(4.01-4.63) 11
(4.96-5.73) 11
(5.71-6.60) 11
(6.71-7.79)
1 (7.51-8.74)
1 (8.32-9.71)
1 (9.15-10.7)
1 (10.3-12.1)
1 (11.2-13.2)
3.78
4.54
5.60
6.44
7.59
8.51
9.44
10.4
11.7
12.8
4-day
(3.52-4.05) 11
(4.23-4.87) 11
(5.21-6.00)
(5.98-6.90) 11
(7.02-8.14)
1 (7.85-9.12)
1 (8.70-10.1)
1 (9.56-11.2)
1 (10.7-12.6)
1 (11.6-13.7)
4.36
5.20
6.34
7.24
8.48
9.47
10.5
11.5
13.0
14.1
7-day
(4.09-4.65) 11
(4.88-5.55) 11
(5.94-6.76)
1 (7.91-9.04)
1 (8.81-10.1)
1 (9.73-11.2)
1 (10.7-12.3)
1 (11.9-13.9)
1 (12.9-15.1)
5.00
5.94
7.15
8.09
9.36
10.4
11.4
12.4
13.8
14.9
10-day
(4.70-5.32) 11
(5.58-6.33) 1
1 (7.58-8.61) 11
(8.74-9.96)
1 (9.66-11.0)
1 (10.6-12.1)
1 (11.5-13.2)
1 (12.8-14.7)
1 (13.7-15.9)
6.70
7.91
9.34
10.5
12.0
13.2
14.4
15.6
17.2
18.5
20-day
(6.34-7.09) 11
(7.49-8.36) 11
(8.83-9.87) 11
(9.88-11.1) 11
(11.3-12.7)
(12.4-13.9)
(13.5-15.2)
(14.6-16.5)
(16.1-18.3)
(17.2-19.7)
8.23
9.69
11.3
12.5
14.1
15.3
16.6
17.8
19.4
20.7
30-day
(7.81-8.69) 11
(9.19-10.2) 1
1 (13.3-14.9)
(14.5-16.2)
1 (15.6-17.5)
1 (16.7-18.8)
1 (18.2-20.5)
(19.3-21.9)
10.4
12.1
13.9
15.2
16.9
18.3
19.5
20.8
22.4
23.6
45-day
(9.91-10.9)
(11.6-12.7)
(13.2-14.5)
(14.5-15.9)
(16.1-17.7)
1 (17.3-19.1)
1 (18.5-20.5)
1 (19.6-21.8)
1 (21.1-23.6)
1 (22.2-24.9)
12.4
14.4
16.3
17.7
19.6
21.0
22.4
23.7
25.4
26.7
60-day
(11.8-12.9)
(13.8-15.1)
(15.6-17.0)
(17.0-18.5)
(18.7-20.5)
(20.0-22.0)
(21.3-23.4)
(22.5-24.8)
(24.1-26.6)
(25.3-28.0)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a
given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical
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3/3/2021 Precipitation Frequency Data Server
PDS-based dep-h-duratio n-frequency (DDIF) curves
Latitude: 35.2707°. Longitude:-80-6195'
MIDI
25
I
C.
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C
C
L L
L L
L�
]1
>1 >1
}1 >1
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t �
t
N
N rV
N M
M
M
N M
Pti
,1
.i
m
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r1i
m
v n
Duration
3D
25
r-
5
D — — —
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAAAtlas 14, Volume 2, Version 3 Created (GMT): Wed Mar 3 19:24:592021
Back to Top
Maps & aerials
Small scale terrain
Average recurrence
interval
{years}
— 1
2
— 5
— 14
— 25
54
100
200
500
1000
Du ration
5--mkn —
2-day
— 1 Wsun —
3-stay
15amin —
4-day
— 3"in —
7-ilay
— 60anin —
14-day
— 2fir —
20-day
— 3-41r —
3"ay
— 6-hr —
4"ay
— tzar —
rsiway
244)r
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.2707&Ion=-80.6195&data=depth&units=english&series=pds 2/4

[GYM` IN
Precipitation Frequency Data Server
Large scale terrain
)Olt • Bristol
•
on =ity Q
Winston-salcm
I • . Durham
Greensboro •
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https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.2707&Ion=-80.6195&data=depth&units=english&series=pds 3/4

[GYM` IN
Precipitation Frequency Data Server
Back to Top
US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: HDSC.Questions noaa.gov
Disclaimer
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Precipitation Frequency Data Server
NOAA Atlas 14, Volume 2, Version 3
Location name: Harrisburg, North Carolina, USA* � 'in°
Latitude: 35.2707°, Longitude:-80.6195°
Elevation: 612.37 ft**
*source: ESRI Maps
source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hourp
Duration
Average recurrence interval (years)
1
2
5
10
25
50
1 100
100
200
500
1000
5-min
4.85
(4.48-5.26)
5.72
6.67
1 (6.13-7.25) 11
7.33
(6.73-7.96) 11
8.09
(7.39-8.76)
8.60
1 (7.82-9.31)
9.07
1 (8.22-9.82)
9.48
1 (8.54-10.3)
9.94
1 (8.87-10.8)
10.2
1 (9.07-11.1)
3.87
4.58
5.34
5.87
6.44
6.85
7.21
7.52
7.86
8.07
10-min
(3.57-4.20) 11
(4.22-4.98) 11
(4.91-5.80) 11
(5.38-6.36) 11
(5.89-6.98)
1 (6.23-7.42)
1 (6.53-7.80)
1 (6.77-8.14)
1 (7.01-8.53)
1 (7.14-8.77)
3.23
3.84
4.50
4.94
5.45
5.78
6.08
6.32
6.59
6.75
15-min
(2.98-3.50) 11
(3.54-4.18) 11
(4.14-4.89) 11
(4.54-5.36) 11
(4.98-5.90)
1 (5.26-6.26)
1 (5.50-6.57)
1 (5.69-6.85)
1 (5.88-7.15)
1 (5.98-7.34)
2.21
2.65
3.20
3.58
4.03
4.36
4.65
4.92
5.25
5.47
30-min
(2.04-2.40)1
(2.44-2.88) 11
(2.94-3.47) 11
(3.29-3.88) 11
(3.69-4.37)
1 (3.96-4.71)
1 (4.21-5.03)
1 (4.43-5.33)
1 (4.68-5.69)
1 (4.84-5.94)
1.38
1.66
2.05
2.33
2.69
2.95
3.20
3.45
3.76
3.99
60-min
(1.27-1.50) 11
(1.53-1.81) 11
(1.89-2.23) 11
(2.14-2.53) 11
(2.46-2.91)
1 (2.69-3.19)
1 (2.90-3.47)
1 (3.11-3.74)
1 (3.36-4.08)
1 (3.53-4.34)
0.800
F 0.968
1.20
1.38
1.60
1.77
1.94
2.11
2.33
2.49
2-hr
(0.734-0.873)
(0.887-1.06) 11
(1.10-1.31) 11
(1.25-1.50) 11
(1.46-1.75)
1 (1.60-1.93)
1 (1.75-2.12)
1 (1.88-2.30)
1 (2.06-2.54)
1 (2.18-2.73)
0.569
0.687
0.857
0.988
1.16
1.30
1.44
1.58
1.77
1.92
3-hr
(0.521-0.623)
(0.630-0.753)
(0.785-0.939)
(0.901-1.08)
(1.06-1.27)
1 (1.18-1.42)
1 (1.29-1.57)
1 (1.41-1.72)
1 (1.56-1.94)
1 (1.67-2.10)
0.344
0.415
0.518
0.599
0.708
F 0.794
F 0.882
F 0.972
1.10
1.19
6-hr
(0.316-0.377)
(0.381-0.455)
(0.475-0.567)
(0.547-0.654)
(0.642-0.770)
(0.716-0.864)
(0.790-0.959)
(0.862-1.06)
(0.959-1.19)
(1.03-1.30)
0.203
0.245
0.307
0.356
0.424
0.479
0.535
0.594
0.676
0.742
12-hr
(0.187-0.221)
(0.225-0.268)
(0.282-0.336)
(0.326-0.389)
(0.385-0.462)
(0.431-0.520)
(0.478-0.581)
(0.524-0.644)
(0.587-0.732)
(0.635-0.804)
0.120
0.145
0.182
0.211
0.250
0.282
0.314
0.347
0.393
0.428
24-hr
(0.111-0.129)
(0.135-0.156)
(0.169-0.196)
(0.196-0.227)
(0.231-0.270)
(0.260-0.303)
(0.289-0.338)
(0.318-0.374)
(0.358-0.423)
(0.390-0.463)
0.070
0.085
0.106
0.122
0.144
0.162
0.180
0.199
0.224
0.244
2-day
(0.065-0.076)
(0.079-0.091)
(0.098-0.114)
(0.113-0.131)
(0.133-0.155)
(0.149-0.174)
(0.166-0.194)
(0.182-0.214)
(0.205-0.242)
(0.222-0.263)
0.050
0.060
0.074
0.085
0.101
0.113
0.126
0.138
0.156
0.170
3-day
(0.046-0.053)
(0.056-0.064)
(0.069-0.080)
(0.079-0.092)
(0.093-0.108)
(0.104-0.121)
(0.116-0.135)
(0.127-0.149)
(0.143-0.168)
(0.155-0.183)
0.039
0.047
0.058
0.067
0.079
0.089
0.098
0.108
0.122
0.133
4-day
(0.037-0.042)
(0.044-0.051)
(0.054-0.063)
(0.062-0.072)
(0.073-0.085)
(0.082-0.095)
(0.091-0.105)
(0.100-0.116)
(0.112-0.131)
(0.121-0.143)
0.026
0.031
0.038
0.043
0.050
0.056
0.062
0.069
0.077
0.084
7-day
(0.024-0.028)
(0.029-0.033)
(0.035-0.040)
(0.040-0.046)
(0.047-0.054)
(0.052-0.060)
(0.058-0.067)
(0.063-0.073)
(0.071-0.082)
(0.077-0.090)
0.021
0.025
0.030
0.034
0.039
0.043
0.047
0.052
0.057
0.062
10-day
(0.020-0.022)
(0.023-0.026)
(0.028-0.032)
(0.032-0.036)
(0.036-0.041)
(0.040-0.046)
(0.044-0.050)
(0.048-0.055)
(0.053-0.061)
(0.057-0.066)
0.014
0.016
0.019
0.022
0.025
0.027
0.030
0.032
0.036
0.039
20-day
(0.013-0.015)
(0.016-0.017)
(0.018-0.021)
(0.021-0.023)
(0.024-0.026)
(0.026-0.029)
(0.028-0.032)
(0.030-0.034)
(0.033-0.038)
(0.036-0.041)
0.011
0.013
0.016
0.017
0.020
0.021
0.023
0.025
0.027
0.029
30-day
(0.011-0.012)
(0.013-0.014)
(0.015-0.016)
(0.016-0.018)
(0.018-0.021)
(0.020-0.022)
(0.022-0.024)
(0.023-0.026)
(0.025-0.029)
(0.027-0.030)
0.010
0.011
0.013
0.014
0.016
0.017
0.018
0.019
0.021
0.022
45-day
(0.009-0.010)
(0.011-0.012)
(0.012-0.013)
(0.013-0.015)
(0.015-0.016)
(0.016-0.018)
(0.017-0.019)
(0.018-0.020)
(0.020-0.022)
(0.021-0.023)
0.009
0.010
0.011
0.012
0.014
0.015
0.016
0.016
0.018
0.019
60-day
(0.008-0.009)
(0.010-0.010)
(0.011-0.012)
(0.012-0.013)
(0.013-0.014)
(0.014-0.015)
(0.015-0.016)
(0.016-0.017)
(0.017-0.018)
(0.018-0.019)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a
given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.2707&Ion=-80.6195&data=intensity&units=english&series=pds 1 /4

3/3/2021 Precipitation Frequency Data Server
C
41
PIDS-based intensity -duration -frequency (IDF) curves
Latitude: 35.2707°. Longitude--80.6195'
I161OR616161
10 000
0.001 r
r
t
•�
t r0
r0 rV
r0 M
M
ru
r0 M
r+ O
0
0
Ln O
'-I
r-i
rn
to
r-I
N
ro
V to
Duration
100.DDD
r
10.000
C
�+ 1.000
c
as
c
c
0.100
.EL
a 0.010
0.001 1 1 1 1 1 1 1 1 1 1
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval �years�
NDAA Atia5 14, Volume 2, Versior} 3 Created (GMT): Wed Mar 3 19A4:5152021
Back to Top
Maps & aerials
Small scale terrain
Average recurrence
mterva I
{years}
— 1
2
— 5
— 14
— 25
54
100
200
500
1000
Du ration
5--mkn —
2-day
— I Ws1ln —
3-stay
I S- min —
4-day
— 3"in —
7-ilay
— 64-min —
I"ay
— 2fir —
20-day
— 3-41r —
3"ay
— 6-hr —
4"ay
— tzar —
rsiway
24-,hr
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.htmI?Iat=35.2707&Ion=-80.6195&data=intensity&units=engIish&series=pds 2/4

[GYM` IN
Precipitation Frequency Data Server
Large scale terrain
)Olt • Bristol
•
on =ity Q
Winston-salcm
I • . Durham
Greensboro •
r.lirrs•.I,.II Ralf
I45 +
•AsheviIIe NORTI k�AR0LINA
�a r'1Q0 tt2 FavPtt��ill�
'Greenville X' +
1 —
,[ 0YA11TrT CAR. 0LINA
1pj'1 m W i
100k
6 mi • Y
Large scale map
W- - - — —
Johnson Ciry
J
it. olo.S hem Greensboro Ddrham
f,
Rai,
••• North
Carolina
100km
�mbia
� 6 mi p �
Large scale aerial
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.2707&Ion=-80.6195&data=intensity&units=english&series=pds 3/4

[GYM` IN
Precipitation Frequency Data Server
Back to Top
US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: HDSC.Questions noaa.gov
Disclaimer
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Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
92.29
2
728
341,248
------
------
------
20055-Culvert Design for Stream
2
SCS Runoff
12.29
2
718
28,124
------
------
------
20055-Culvert Design for Wetlands
20055-Culvert Design Hydraflow.gpw
Return Period: 2 Year
Wednesday, 05 / 26 / 2021

Hydrograph Report
2
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 1
20055-Culvert Design for Stream
Hydrograph type
= SCS Runoff
Storm frequency
= 2 yrs
Time interval
= 2 min
Drainage area
= 56.700 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 3.47 in
Storm duration
= 24 hrs
Q (cfs)
100.00
90.00
-1 III,
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
0
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
20055-Culvert Design for Stream
Hyd. No. 1 -- 2 Year
Wednesday, 05 / 26 / 2021
= 92.29 cfs
= 728 min
= 341,248 cuft
= 81
= 0 ft
= 26.90 min
= Type II
= 484
Q (cfs)
100.00
90.00
-1 III,
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 1 Time (min)

TR55 Tc Worksheet
3
Hyd. No. 1
20055-Culvert Design for Stream
Description
Sheet Flow
Manning's n-value
Flow length (ft)
Two-year 24-hr precip. (in)
Land slope (%)
Travel Time (min)
Shallow Concentrated Flow
Flow length (ft)
Watercourse slope (%)
Surface description
Average velocity (ft/s)
Travel Time (min)
Channel Flow
X sectional flow area (sqft)
Wetted perimeter (ft)
Channel slope (%)
Manning's n-value
Velocity (ft/s)
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
A
B
C
= 0.400
0.011
0.011
= 100.0
0.0
0.0
= 3.47
0.00
0.00
= 2.00
0.00
0.00
= 20.62 +
0.00 +
0.00
= 380.00
0.00
0.00
= 4.20
0.00
0.00
= Unpaved
Paved
Paved
=3.31
0.00
0.00
= 1.92 +
0.00 +
0.00
= 240.00
240.00
0.00
= 140.00
140.00
0.00
= 2.50
2.00
0.00
= 0.070
0.035
0.015
=4.83
8.64
0.00
Flow length (ft) ({0})415.0 1540.0 0.0
Travel Time (min) = 1.43 + 2.97 + 0.00
Total Travel Time, Tc..............................................................................
Totals
= 20.62
= 1.92
= 4.40
26.90 min

Hydrograph Report
4
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 2
20055-Culvert Design for Wetlands
Hydrograph type
= SCS Runoff
Storm frequency
= 2 yrs
Time interval
= 2 min
Drainage area
= 4.600 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 3.47 in
Storm duration
= 24 hrs
Q (cfs)
14.00
12.00
10.00
1M
M. Me
4.00
2.00
M
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
20055-Culvert Design for Wetlands
Hyd. No. 2 -- 2 Year
Wednesday, 05 / 26 / 2021
= 12.29 cfs
= 718 min
= 28,124 cuft
= 81
= 0 ft
= 7.60 min
= Type II
= 484
Q (cfs)
14.00
12.00
10.00
4.00
2.00
0.00
120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 2 Time (min)

5
TR55 Tc Worksheet
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 2
20055-Culvert Design for Wetlands
Description
A
B
C
Totals
Sheet Flow
Manning's n-value
= 0.150
0.011
0.011
Flow length (ft)
= 50.0
0.0
0.0
Two-year 24-hr precip. (in)
= 3.47
0.00
0.00
Land slope (%)
= 2.00
0.00
0.00
Travel Time (min)
= 5.40 +
0.00 +
0.00 =
5.40
Shallow Concentrated Flow
Flow length (ft)
= 380.00
0.00
0.00
Watercourse slope (%)
= 9.50
0.00
0.00
Surface description
= Unpaved
Paved
Paved
Average velocity (ft/s)
=4.97
0.00
0.00
Travel Time (min)
= 1.27 +
0.00 +
0.00 =
1.27
Channel Flow
X sectional flow area (sqft)
= 135.00
0.00
0.00
Wetted perimeter (ft)
= 140.00
0.00
0.00
Channel slope (%)
= 2.90
0.00
0.00
Manning's n-value
= 0.100
0.035
0.015
Velocity (ft/s)
=2.48
0.00
0.00
Flow length (ft)
({0})135.0
0.0
0.0
Travel Time (min)
= 0.91 +
0.00 +
0.00 =
0.91
Total Travel Time, Tc..............................................................................
7.60 min

Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
167.77
2
728
615,596
------
------
------
20055-Culvert Design for Stream
2
SCS Runoff
22.04
2
718
50,735
------
------
------
20055-Culvert Design for Wetlands
20055-Culvert Design Hydraflow.gpw
Return Period: 10 Year
Wednesday, 05 / 26 / 2021

7
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Wednesday, 05 / 26 / 2021
Hyd. No. 1
20055-Culvert Design for Stream
Hydrograph type
= SCS Runoff
Peak discharge
= 167.77 cfs
Storm frequency
= 10 yrs
Time to peak
= 728 min
Time interval
= 2 min
Hyd. volume
= 615,596 cuft
Drainage area
= 56.700 ac
Curve number
= 81
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= TR55
Time of conc. (Tc)
= 26.90 min
Total precip.
= 5.06 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
180.00
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0 00
20055-Culvert Design for Stream
Hyd. No. 1 -- 10 Year
Q (cfs)
180.00
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0 00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
— Hyd No. 1 Time (min)

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 2
20055-Culvert Design for Wetlands
Hydrograph type
= SCS Runoff
Storm frequency
= 10 yrs
Time interval
= 2 min
Drainage area
= 4.600 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 5.06 in
Storm duration
= 24 hrs
Q (cfs)
24.00
20.00
16.00
12.00
: M
4.00
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
20055-Culvert Design for Wetlands
Hyd. No. 2 -- 10 Year
Wednesday, 05 / 26 / 2021
= 22.04 cfs
= 718 min
= 50,735 cuft
= 81
= 0 ft
= 7.60 min
= Type II
= 484
Q (cfs)
24.00
20.00
16.00
12.00
M
4.00
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
— Hyd No. 2 Time (min)

Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
214.37
2
728
788,712
------
------
------
20055-Culvert Design for Stream
2
SCS Runoff
28.02
2
718
65,003
------
------
------
20055-Culvert Design for Wetlands
20055-Culvert Design Hydraflow.gpw
Return Period: 25 Year
Wednesday, 05 / 26 / 2021

Hydrograph Report
10
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 1
20055-Culvert Design for Stream
Hydrograph type
= SCS Runoff
Storm frequency
= 25 yrs
Time interval
= 2 min
Drainage area
= 56.700 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 6.01 in
Storm duration
= 24 hrs
Q (cfs)
240.00
210.00
180.00
150.00
120.00
30.00
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
Wednesday, 05 / 26 / 2021
= 214.37 cfs
= 728 min
= 788,712 cuft
= 81
= 0 ft
= 26.90 min
= Type II
= 484
Q (cfs)
240.00
210.00
180.00
150.00
120.00
30.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
— Hyd No. 1 Time (min)

Hydrograph Report
11
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 2
20055-Culvert Design for Wetlands
Hydrograph type
= SCS Runoff
Storm frequency
= 25 yrs
Time interval
= 2 min
Drainage area
= 4.600 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 6.01 in
Storm duration
= 24 hrs
Q (cfs)
30.00
25.00
20.00
15.00
10.00
5.00
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
20055-Culvert Design for Wetlands
Hyd. No. 2 -- 25 Year
Wednesday, 05 / 26 / 2021
= 28.02 cfs
= 718 min
= 65,003 cuft
= 81
= 0 ft
= 7.60 min
= Type II
= 484
Q (cfs)
30.00
25.00
20.00
15.00
10.00
5.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
— Hyd No. 2 Time (min)

Hydrograph Summary Report
12
Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
251.48
2
728
928,391
------
------
------
20055-Culvert Design for Stream
2
SCS Runoff
32.78
2
718
76,515
------
------
------
20055-Culvert Design for Wetlands
20055-Culvert Design Hydraflow.gpw
Return Period: 50 Year
Wednesday, 05 / 26 / 2021

Hydrograph Report
13
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 1
20055-Culvert Design for Stream
Hydrograph type
= SCS Runoff
Storm frequency
= 50 yrs
Time interval
= 2 min
Drainage area
= 56.700 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 6.76 in
Storm duration
= 24 hrs
Q (cfs)
280.00
240.00
200.00
160.00
120.00
F• ••
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
Wednesday, 05 / 26 / 2021
= 251.48 cfs
= 728 min
= 928,391 cuft
= 81
= 0 ft
= 26.90 min
= Type II
= 484
Q (cfs)
280.00
240.00
200.00
160.00
120.00
40.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
— Hyd No. 1 Time (min)

Hydrograph
Report
14
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 2
20055-Culvert Design for Wetlands
Hydrograph type = SCS Runoff
Storm frequency = 50 yrs
Time interval = 2 min
Drainage area = 4.600 ac
Basin Slope = 0.0 %
Tc method = TR55
Total precip. = 6.76 in
Storm duration = 24 hrs
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
Wednesday, 05 / 26
= 32.78 cfs
= 718 min
= 76,515 cuft
= 81
= 0 ft
= 7.60 min
= Type II
= 484
/ 2021
Q (cfs)
35.00
20055-Culvert Design for Wetlands
Hyd. No. 2 -- 50 Year
Q (cfs)
35.00
30.00
30.00
25.00
25.00
20.00
20.00
15.00
15.00
10.00
10.00
5.00
5.00
0.00
0 120
— Hyd No.
240 360 480 600 720 840 960 1080
2
0.00
1200 1320 1440
Time (min)

Hydrograph Summary Report
15
Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
290.21
2
728
1,075,730
------
------
------
20055-Culvert Design for Stream
2
SCS Runoff
37.73
2
718
88,658
------
------
------
20055-Culvert Design for Wetlands
20055-Culvert Design Hydraflow.gpw
Return Period: 100 Year
Wednesday, 05 / 26 / 2021

Hydrograph Report
16
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 1
20055-Culvert Design for Stream
Hydrograph type
= SCS Runoff
Storm frequency
= 100 yrs
Time interval
= 2 min
Drainage area
= 56.700 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 7.54 in
Storm duration
= 24 hrs
Q (cfs)
320.00
280.00
240.00
200.00
160.00
120.00
40.00
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
Wednesday, 05 / 26 / 2021
= 290.21 cfs
= 728 min
= 1,075,730 cuft
= 81
= 0 ft
= 26.90 min
= Type II
= 484
Q (cfs)
320.00
280.00
240.00
200.00
160.00
120.00
40.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
— Hyd No. 1 Time (min)

Hydrograph Report
17
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 2
20055-Culvert Design for Wetlands
Hydrograph type
= SCS Runoff
Storm frequency
= 100 yrs
Time interval
= 2 min
Drainage area
= 4.600 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 7.54 in
Storm duration
= 24 hrs
Q (cfs)
40.00
30.00
20.00
10.00
0.00 1 11
0 120 240
— Hyd No. 2
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
20055-Culvert Design for Wetlands
Hyd. No. 2 -- 100 Year
360 480 600 720 840 960
Wednesday, 05 / 26 / 2021
= 37.73 cfs
= 718 min
= 88,658 cuft
= 81
= 0 ft
= 7.60 min
= Type II
= 484
Q (cfs)
40.00
30.00
20.00
10.00
0.00
1080 1200 1320 1440
Time (min)

Hydraflow Table of Contents
20055-Culvert Design Hydraflow.gpw
Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
2 - Year
Wednesday, 05 / 26 / 2021
SummaryReport......................................................................................................................... 1
HydrographReports................................................................................................................... 2
Hydrograph No. 1, SCS Runoff, 20055-Culvert Design for Stream ......................................... 2
TR-55 Tc Worksheet........................................................................................................... 3
Hydrograph No. 2, SCS Runoff, 20055-Culvert Design for Wetlands ...................................... 4
TR-55 Tc Worksheet........................................................................................................... 5
10 - Year
SummaryReport......................................................................................................................... 6
HydrographReports................................................................................................................... 7
Hydrograph No. 1, SCS Runoff, 20055-Culvert Design for Stream ......................................... 7
Hydrograph No. 2, SCS Runoff, 20055-Culvert Design for Wetlands ...................................... 8
25 - Year
SummaryReport......................................................................................................................... 9
HydrographReports................................................................................................................. 10
Hydrograph No. 1, SCS Runoff, 20055-Culvert Design for Stream ....................................... 10
Hydrograph No. 2, SCS Runoff, 20055-Culvert Design for Wetlands .................................... 11
50 - Year
SummaryReport....................................................................................................................... 12
HydrographReports................................................................................................................. 13
Hydrograph No. 1, SCS Runoff, 20055-Culvert Design for Stream ....................................... 13
Hydrograph No. 2, SCS Runoff, 20055-Culvert Design for Wetlands .................................... 14
100 -Year
SummaryReport....................................................................................................................... 15
HydrographReports................................................................................................................. 16
Hydrograph No. 1, SCS Runoff, 20055-Culvert Design for Stream ....................................... 16
Hydrograph No. 2, SCS Runoff, 20055-Culvert Design for Wetlands .................................... 17

Culvert Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
Culvert for Stream (25-yr)
Invert Elev Dn (ft)
= 618.40
Calculations
Pipe Length (ft)
= 40.00
Qmin (cfs)
Slope (%)
= 0.50
Qmax (cfs)
Invert Elev Up (ft)
= 618.60
Tailwater Elev (ft)
Rise (in)
= 72.0
Shape
= Circular
Highlighted
Span (in)
= 72.0
Qtotal (cfs)
No. Barrels
= 1
Qpipe (cfs)
n-Value
= 0.012
Qovertop (cfs)
Culvert Type
= Circular Concrete
Veloc Dn (ft/s)
Culvert Entrance
= Groove end w/headwall (C)
Veloc Up (ft/s)
Coeff. K,M,c,Y,k
= 0.0018, 2, 0.0292, 0.74, 0.2
HGL Dn (ft)
HGL Up (ft)
Embankment
Hw Elev (ft)
Top Elevation (ft)
= 627.40
Hw/D (ft)
Top Width (ft)
= 24.00
Flow Regime
Crest Width (ft)
= 10.00
El-
623.00
626.00
624 ❑0
622 ❑0
62❑ ❑0
61a ❑0
616 on
;R)
Culvert for Stream [25-yr}
Wednesday, May 26 2021
= 215.00
= 215.00
= (dc+D)/2
= 215.00
= 215.00
= 0.00
= 8.53
= 10.71
= 623.40
= 622.61
= 624.48
= 0.98
= Inlet Control
Hw DeF
th (R)
9.40
7.40
540
340
140
-0 s❑
-z s❑
0 5 10 15 20 25 30 35 40 40 55 60
Circular Culvert HGL Embank
Reach (ft)

Culvert Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
Culvert for Stream (50-yr)
Invert Elev Dn (ft)
= 618.40
Calculations
Pipe Length (ft)
= 40.00
Qmin (cfs)
Slope (%)
= 0.50
Qmax (cfs)
Invert Elev Up (ft)
= 618.60
Tailwater Elev (ft)
Rise (in)
= 72.0
Shape
= Circular
Highlighted
Span (in)
= 72.0
Qtotal (cfs)
No. Barrels
= 1
Qpipe (cfs)
n-Value
= 0.012
Qovertop (cfs)
Culvert Type
= Circular Concrete
Veloc Dn (ft/s)
Culvert Entrance
= Groove end w/headwall (C)
Veloc Up (ft/s)
Coeff. K,M,c,Y,k
= 0.0018, 2, 0.0292, 0.74, 0.2
HGL Dn (ft)
HGL Up (ft)
Embankment
Hw Elev (ft)
Top Elevation (ft)
= 627.40
Hw/D (ft)
Top Width (ft)
= 24.00
Flow Regime
Crest Width (ft)
= 10.00
El-(ft)
628.00
626.00
624 00
622 00
62❑ 00
61a 00
61a00
Culvert for Stream [50-yr}
5 10 15 20 25 30 35 40 45 55
Circular Culvert HGL Embank
Wednesday, May 26 2021
= 252.00
= 252.00
= (dc+D)/2
= 252.00
= 252.00
= 0.00
= 9.72
= 11.49
= 623.57
= 622.95
= 625.34
= 1.12
= Inlet Control
Hw Depth (R)
9.40
7.40
540
340
140
-060
-2 60
60
Reach (R)

Culvert Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
Culvert for Stream (100-yr)
Invert Elev Dn (ft)
= 618.40
Calculations
Pipe Length (ft)
= 40.00
Qmin (cfs)
Slope (%)
= 0.50
Qmax (cfs)
Invert Elev Up (ft)
= 618.60
Tailwater Elev (ft)
Rise (in)
= 72.0
Shape
= Circular
Highlighted
Span (in)
= 72.0
Qtotal (cfs)
No. Barrels
= 1
Qpipe (cfs)
n-Value
= 0.012
Qovertop (cfs)
Culvert Type
= Circular Concrete
Veloc Dn (ft/s)
Culvert Entrance
= Groove end w/headwall (C)
Veloc Up (ft/s)
Coeff. K,M,c,Y,k
= 0.0018, 2, 0.0292, 0.74, 0.2
HGL Dn (ft)
HGL Up (ft)
Embankment
Hw Elev (ft)
Top Elevation (ft)
= 627.40
Hw/D (ft)
Top Width (ft)
= 24.00
Flow Regime
Crest Width (ft)
= 10.00
El- (ft)
628.00
626.00
624 00
622 00
62❑ 00
61a 00
61a00
Culvert for Stream [100-YO
5 10 15 20 25 30 35 40 45 55
Circular Culvert HGL Embank
Wednesday, May 26 2021
= 291.00
= 291.00
= (dc+D)/2
= 291.00
= 291.00
= 0.00
= 10.96
= 12.35
= 623.73
= 623.26
= 626.12
= 1.25
= Inlet Control
Hw Depth (R)
9.40
7.40
540
340
140
-060
-2 60
60
Reach (R)

Culvert Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
Culvert for Wetland
(25-yr)
Invert Elev Dn (ft)
= 621.60
Calculations
Pipe Length (ft)
= 40.00
Qmin (cfs)
Slope (%)
= 0.50
Qmax (cfs)
Invert Elev Up (ft)
= 621.80
Tailwater Elev (ft)
Rise (in)
= 30.0
Shape
= Circular
Highlighted
Span (in)
= 30.0
Qtotal (cfs)
No. Barrels
= 1
Qpipe (cfs)
n-Value
= 0.012
Qovertop (cfs)
Culvert Type
= Circular Concrete
Veloc Dn (ft/s)
Culvert Entrance
= Groove end w/headwall (C)
Veloc Up (ft/s)
Coeff. K,M,c,Y,k
= 0.0018, 2, 0.0292, 0.74, 0.2
HGL Dn (ft)
HGL Up (ft)
Embankment
Hw Elev (ft)
Top Elevation (ft)
= 626.90
Hw/D (ft)
Top Width (ft)
= 24.00
Flow Regime
Crest Width (ft)
= 10.00
El. (R)
627.00
626.00
625 o0
624 06
623 ❑6
622 ❑6
621 on
62000
Culvert for Wetland (25-yr)
5 10 15 20 25 30 35 40 45 55
Circular Culvert HGL Embank
Wednesday, May 26 2021
= 30.00
= 30.00
= (dc+D)/2
= 30.00
= 30.00
= 0.00
= 6.60
= 7.64
= 623.78
= 623.67
= 624.73
= 1.17
= Inlet Control
Hw Depth (R)
5.20
4.20
320
2 211
1 2❑
02❑
-0W
-1 W
60
Reach (R)

Culvert Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
Culvert for Wetland
(50-yr)
Invert Elev Dn (ft)
= 621.60
Calculations
Pipe Length (ft)
= 40.00
Qmin (cfs)
Slope (%)
= 0.50
Qmax (cfs)
Invert Elev Up (ft)
= 621.80
Tailwater Elev (ft)
Rise (in)
= 30.0
Shape
= Circular
Highlighted
Span (in)
= 30.0
Qtotal (cfs)
No. Barrels
= 1
Qpipe (cfs)
n-Value
= 0.012
Qovertop (cfs)
Culvert Type
= Circular Concrete
Veloc Dn (ft/s)
Culvert Entrance
= Groove end w/headwall (C)
Veloc Up (ft/s)
Coeff. K,M,c,Y,k
= 0.0018, 2, 0.0292, 0.74, 0.2
HGL Dn (ft)
HGL Up (ft)
Embankment
Hw Elev (ft)
Top Elevation (ft)
= 626.90
Hw/D (ft)
Top Width (ft)
= 24.00
Flow Regime
Crest Width (ft)
= 10.00
El. (R)
627.00
626.00
625 o0
624 06
623 ❑6
622 ❑6
621 on
62000
Culvert for Wetland (50-yr)
5 10 15 20 25 30 35 40 40 55
Circular Culvert HGL Embank
Wednesday, May 26 2021
= 35.00
= 35.00
= (dc+D)/2
= 35.00
= 35.00
= 0.00
= 7.51
= 8.28
= 623.85
= 623.81
= 625.13
= 1.33
= Inlet Control
Hw Depth (R)
5.20
4.20
320
2 211
1 2❑
02❑
-0W
-1 W
60
Reach (R)

Culvert Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
Culvert for Wetland
(100-yr)
Invert Elev Dn (ft)
= 621.60
Calculations
Pipe Length (ft)
= 40.00
Qmin (cfs)
Slope (%)
= 0.50
Qmax (cfs)
Invert Elev Up (ft)
= 621.80
Tailwater Elev (ft)
Rise (in)
= 30.0
Shape
= Circular
Highlighted
Span (in)
= 30.0
Qtotal (cfs)
No. Barrels
= 1
Qpipe (cfs)
n-Value
= 0.012
Qovertop (cfs)
Culvert Type
= Circular Concrete
Veloc Dn (ft/s)
Culvert Entrance
= Groove end w/headwall (C)
Veloc Up (ft/s)
Coeff. K,M,c,Y,k
= 0.0018, 2, 0.0292, 0.74, 0.2
HGL Dn (ft)
HGL Up (ft)
Embankment
Hw Elev (ft)
Top Elevation (ft)
= 626.90
Hw/D (ft)
Top Width (ft)
= 24.00
Flow Regime
Crest Width (ft)
= 10.00
El. (R)
627.00
626.00
625 o0
624 06
623 ❑6
622 ❑6
621 on
62000
Culvert for Wetland (100-yr)
5 10 15 20 25 30 35 40 40 55
Circular Culvert HGL Embank
Wednesday, May 26 2021
= 40.00
= 40.00
= (dc+D)/2
= 40.00
= 40.00
= 0.00
= 8.43
= 8.99
= 623.91
= 623.93
= 625.58
= 1.51
= Inlet Control
Hw Depth (R)
5.20
4.20
320
2 211
1 2❑
02❑
-0W
-1 W
60
Reach (R)

180
10,000
168
8,000
(1)
(2)
(3)
6.0
156
6, 000
6.0
144
5, 000
5.0
4, 000
6.0
5.0
132
4.0
3, 000
5.0
4.0
120
THE CROSS SECTIONAL AREA
108
2,000
4.0
3.0
3.0
OF A 66"D CULVERT
IS 23.76 SF, WHICH IS
LESS THAN A 72"D CULVERT
WITH A 1' BURY (25.18 SF)
96
1,000
3.0
84
600
2.0
2.0
500 p
USE 72"D
2
\
400 ()1 00 -f291 CFS
2.0
Hw/0= 1.6
In
LLJ
X„ Dla
v
1.5
Hw= 9.6'
_
N
1.5
U
Z
a_
LLJ
60 U
I j
1.5
Z
?
Q25 = Q
f215
Hw/D= 1.2
0
54 ..
CFS
Hw= 7.2'
Z
w
48
100
a_
J
Q
80
w
U
42 U
60
1.0
1.0
O
in
50 0
LLJ
1.0
w
36
40
a
0.9
0.9
LLJa
30
0.9
Q33
LLJ
p
30
20
0.8
0.8
0.8
27
10
24
8.0
0.7
0.7
0.7
6.0
21
5.0 HW ENTRANCE
4.0 D SCALE TYPE
o.s
0.6
3.0 (1) SQUARE EDGE
0.6
18
WITH HEADWALL
2.0 (2) GROOVED END
WITH HEADWAL
10.5
15
(3) GROOVED END
PROJECTING
0'S
1.0
0.5
12
TO USE SCALE (2) OR (3) PROJECT HEADWATER
DEPTH
F O R
HORISONTALLY TO SCALE (1), THEN
USE STRAIGHT INCLINED LINE THROUGH
CONCRETE
PIPE
CULVERTS
D AND O SCALES, OR REVERSE.
WITH
INLET
CONTROL
•®®Pc111,11filli
iates
master planning . civil engineering
urban design . landscape architecture
BROTHERS ESTATE
CULVERT DESIGN AT STREAM
HARRISBURG, NORTH CAROLINA
FOR
IN SITU STUDIO
Scale: NTS
Date: 2021 /05/01
Job #: 20055
By: MT

180
10,000
168
8,000
(1) (2)
(3)
6.0
156
6, 000
6.0
144
5, 000
5.0
4, 000
6.0
5.0
132
3, 000
4.0
5.0
4.0
120
2,000
4.0
108
3.0
3.0
96
1,000
3.0
s00
84
600
2.0
2.0
500
p
72
400
\
=
2.0
Hw/0= 1.6
w
X DIO
300
1.5
Hw= 4.0'
_
N
1.5
U
Z
60
LL-
U
200
w
1.5
Z
z
GF5
�
Q
Hw/0= 1.2
p
54
O
Hw= 3.0'
100
0
Z
j
48
�
80
010
GFS
0
��
O
U
42
=LLJ
U
60
cj
1.0
1.0
O
5
QZ
�
1.0
w
36
40
a
0.9
0.9
w
30
a
0.9
Q
33
=
p
20
0 8
0.8
USE 30"D
0
0.8
27
10
8.0
0.7
0.7
24
0.7
6.0
21
5.0
HW ENTRANCE
4.0
D SCALE TYPE
o.s
0.6
3.0
(1) SQUARE EDGE
0.6
18
WITH HEADWALL
2.0
(2) GROOVED END
WITH HEADWAL
10.5
10.5
15
(3) GROOVED END
PROJECTING
1.0
0.5
12
TO USE SCALE (2) OR (3) PROJECT
HEADWATER
DEPTH F O R
HORISONTALLY TO SCALE (1), THEN
USE STRAIGHT INCLINED LINE THROUGH
CONCRETE
PIPE
CULVERTS
D AND O SCALES, OR REVERSE.
WITH INLET CONTROL
•®® associates
master planning . civil engineering
urban design . landscape architecture
BROTHERS ESTATE Scale: NTS
CULVERT DESIGN AT WETLANDS Date: 2021 /03/03
HARRISBURG, NORTH CAROLINA Job #: 20055
FOR By: MT
IN SITU STUDIOS
0
0
r
0
0
z
0
co
LU
0

BROTHERS ESTATE
TABLE OF CONTENTS
III. STORM DESIGN CALCULATIONS
- Soil Map
- Curve Number
- Hydrograph Report
- Culvert Profile (25-yr, 50-yr, 100-yr)
- RipRap Design

jA
r
EnB°
t'
•� 7-1:.�fJira �h�.
� EnB ,' #�••�
r•.
a _ u
. i '. �i*+.R '�yii' 4i �t :•:. ' - � r;A,-#�'.-'y,'� '1Nyt.4"�9.r�,.7•�1.'`��` 3+.. _ �x n '*7�-_•
23000 Hmp mmu IM02 OM wauNd cR RfNo OQo

Hydrologic Soil Group—Cabarrus County, North Carolina
(20055-SD HSG Soil Map)
MAP LEGEND
Area of Interest (AOI)
0
Area of Interest (AOI)
Soils
Soil Rating
Polygons
0
A
0
A/D
0
B
0
B/D
0
C
0
C/D
0
D
0
Not rated or not available
Soil Rating
Lines
r 0
A
r 0
A/D
B
r
B/D
N 0
C
r 0
C/D
r 0
D
r 0
Not rated or not available
Soil Rating
Points
0
A
0
A/D
0
B
0
B/D
❑ C
0 C/D
0 D
❑ Not rated or not available
Water Features
Streams and Canals
Transportation
— Rails
­0 Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
MAP INFORMATION
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Cabarrus County, North Carolina
Survey Area Data: Version 19, Jun 2, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Nov 6, 2019—Nov
20, 2019
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
USDA Natural Resources Web Soil Survey 4/26/2021
Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group—Cabarrus County, North Carolina
20055-SD HSG Soil Map
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
EnB
Enon sandy loam, 2 to 8
percent slopes
C
3.2
28.2%
EnD
Enon sandy loam, 8 to
15 percent slopes
C
2.7
23.8%
IdB
Iredell loam, 2 to 6
percent slopes
C/D
2.7
23.9%
PoB
Poindexter loam, 2 to 8
percent slopes
C
1.8
16.3%
SfB
Sedgefield sandy loam,
2 to 8 percent slopes
C/D
0.9
7.8%
Totals for Area of Interest
11.2
100.0%
USDA Natural Resources Web Soil Survey 4/26/2021
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group—Cabarrus County, North Carolina
20055-SD HSG Soil Map
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
USDA Natural Resources Web Soil Survey 4/26/2021
Conservation Service National Cooperative Soil Survey Page 4 of 4

Project: Brothers Estate DPR ASSOCIATES, INC Prepared by: MT
DPR Job No.: 20055 RUN-OFF CURVE NUMBER Checked by: HN
Location: Harrisburg, Cabarrus County, NC CULVERT DESIGN Date: 03-03-2021
On -Site Existing Conditions
Total Drain. Area (Ac.)
11.3
Percentage
Site Soil Tvp
soil rou
of Basin
EnB, EnD
C
68.3%
IdB, SfB
C/D
31.7%
Hydrologic Soil Grouo Used
Percent of CN for
Weighted
CN for
Weighted
CN for
Weighted
Total
Weighted
Land Use
No. Acres Drainage Area Group B/D
CN
Group C
CN
Grouo CID
CN
Weighted CN
CN
Woods (Fair Condition)
7.5
66.4% 67
0.0
70
47.8
74
23.3
71.1
47.2
Open Space (Fair Condition)
3.8
33.6% 77
0.0
79
54.0
82
25.8
79.8
26.8
Total
11.3
100 %
74.0
Composite Curve Number (CN):
74
74 USED
C. OPR Dropboxl_Pr jectslActivel2020120055 Brothers Estate-hudu Studio-CabatruslCALCSISTORMrECISTORM120055-CN SD PIPE.xis Sheet 1 of2

Project: Brothers Estate DPR ASSOCIATES, INC Prepared by: MT
DPR Job No.: 20055 RUN-OFF CURVE NUMBER Checked by: HN
Location: Harrisburg, Cabarrus County, NC CULVERT DESIGN Date: 03-03-2021
Total Drain. Area (Ac.)
11.3
Percentage
Site Soil Tvp
soil rou
of Basin
EnB, EnD
C
68.3%
IdB, SfB
C/D
31.7%
Hydrologic Soil Grouo Used
Land Use
Woods (Fair Condition)
Countryside Residential (1 acre)
Open Space (Fair Condition)
Total
Percent of CN for
Weighted
CN for
Weighted
CN for
Weighted
Total
Weighted
No. Acres Drainage Area Group B/D
CN
Group C
CN
Group CID
CN
Weighted CN
CN
0.4 3.5 % 67
0.0
70
47.8
74
23.3
71.1
2.5
7.1 62.8 % 76
0.0
79
54.0
82
25.8
79.8
50.1
3.8 33.6 % 76.5
0.0
79
54.0
81.5
25.8
79.8
26.8
11.3 100%
80 USED
79.5
C. OPR Dropboxl_Pr ject 1Activel2020120055 Brothers Estate-hudu Studio -Cabal iCALCSISTORMrECISTORM120055-CN SD PIPE.xis Sheet 2of2

Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
3.749
2
718
7,505
------
------
------
SD 1-07
2
SCS Runoff
13.42
2
718
26,861
------
------
------
SD 1-09
3
SCS Runoff
4.143
2
718
8,295
------
------
------
SD 1-16
4
SCS Runoff
0.789
2
718
1,580
------
------
------
SD 1-19
5
SCS Runoff
1.776
2
718
3,555
------
------
------
SD 1-21
CADPR Dropbox\ Projects\Active\2020\200
5FftWhre9E fd-Meka Studio -Ca
aTrrte gdaylr®SV=F 'EC\STORM\20055-SD
Desk

2
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 1
SD 1-07
Hydrograph type
= SCS Runoff
Peak discharge
= 3.749 cfs
Storm frequency
= 1 yrs
Time to peak
= 11.97 hrs
Time interval
= 2 min
Hyd. volume
= 7,505 cuft
Drainage area
= 1.900 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 2.88 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
4.00
3.00
2.00
1.00
0.00 ' ' 1
0 2 4
— Hyd No. 1
SD 1-07
Hyd. No. 1 -- 1 Year
6 8 10 12 14
Q (cfs)
4.00
3.00
2.00
1.00
' 0.00
16 18 20 22 24 26
Time (hrs)

3
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 2
SD 1-09
Hydrograph type
= SCS Runoff
Peak discharge
= 13.42 cfs
Storm frequency
= 1 yrs
Time to peak
= 11.97 hrs
Time interval
= 2 min
Hyd. volume
= 26,861 cuft
Drainage area
= 6.800 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 2.88 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
14.00
12.00
10.00
. Me
4.00
2.00
SD 1-09
Hyd. No. 2 -- 1 Year
Q (cfs)
14.00
12.00
10.00
4.00
2.00
0.00 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 2 Time (hrs)

4
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 3
SD 1-16
Hydrograph type
= SCS Runoff
Peak discharge
= 4.143 cfs
Storm frequency
= 1 yrs
Time to peak
= 11.97 hrs
Time interval
= 2 min
Hyd. volume
= 8,295 cuft
Drainage area
= 2.100 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 2.88 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
5.00
4.00
3.00
2.00
1.00
0.00 ' ' ---L
0 2 4
— Hyd No. 3
SD 1-16
Hyd. No. 3 -- 1 Year
6 8 10 12 14
Q (cfs)
5.00
4.00
3.00
2.00
1.00
0.00
16 18 20 22 24 26
Time (hrs)

5
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 4
SD 1-19
Hydrograph type
= SCS Runoff
Peak discharge
= 0.789 cfs
Storm frequency
= 1 yrs
Time to peak
= 11.97 hrs
Time interval
= 2 min
Hyd. volume
= 1,580 cuft
Drainage area
= 0.400 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 2.88 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0 00
SD 1-19
Hyd. No. 4 -- 1 Year
0 2 4 6 8 10 12 14
Hyd No. 4
Q (cfs)

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 5
SD 1-21
Hydrograph type
= SCS Runoff
Storm frequency
= 1 yrs
Time interval
= 2 min
Drainage area
= 0.900 ac
Basin Slope
= 0.0 %
Tc method
= User
Total precip.
= 2.88 in
Storm duration
= 24 hrs
Q (cfs)
2.00
1.00
e
2 4
Hyd No. 5
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
SD 1-21
Hyd. No. 5 -- 1 Year
Tuesday, 06 / 29 / 2021
= 1.776 cfs
= 11.97 hrs
= 3,555 cuft
= 80
= 0 ft
= 5.00 min
= Type II
= 484
6 8 10 12 14 16 18 20 22 24
Q (cfs)
2.00
1.00
1 0.00
26
Time (hrs)

Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
5.172
2
718
10,427
------
------
------
SD 1-07
2
SCS Runoff
18.51
2
718
37,317
------
------
------
SD 1-09
3
SCS Runoff
5.717
2
718
11,525
------
------
------
SD 1-16
4
SCS Runoff
1.089
2
718
2,195
------
------
------
SD 1-19
5
SCS Runoff
2.450
2
718
4,939
------
------
------
SD 1-21
CADPR Dropbox\ Projects\Active\2020\200
5FftWhre9E feLMeka Studio -Ca
aTrrte gdaylr®SV=F 'EC\STORM\20055-SD
Desk

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 1
SD 1-07
Hydrograph type
= SCS Runoff
Peak discharge
= 5.172 cfs
Storm frequency
= 2 yrs
Time to peak
= 11.97 hrs
Time interval
= 2 min
Hyd. volume
= 10,427 cuft
Drainage area
= 1.900 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 3.47 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
6.00
5.00
4.00
3.00
2.00
1.00
0.00 ' '
0 2 4
— Hyd No. 1
SD 1-07
Hyd. No. 1 -- 2 Year
6 8 10 12 14
Q (cfs)
6.00
5.00
4.00
3.00
2.00
1.00
0.00
16 18 20 22 24 26
Time (hrs)

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 2
SD 1-09
Hydrograph type
= SCS Runoff
Peak discharge
= 18.51 cfs
Storm frequency
= 2 yrs
Time to peak
= 11.97 hrs
Time interval
= 2 min
Hyd. volume
= 37,317 cuft
Drainage area
= 6.800 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 3.47 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
21.00
18.00
15.00
12.00
3.00
0.00 ' ' 1
0 2 4
— Hyd No. 2
6 8
SD 1-09
Hyd. No. 2 -- 2 Year
Q (cfs)
21.00
18.00
15.00
12.00
in We
3.00
1- ' ' 0.00
10 12 14 16 18 20 22 24 26
Time (hrs)

10
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 3
SD 1-16
Hydrograph type
= SCS Runoff
Peak discharge
= 5.717 cfs
Storm frequency
= 2 yrs
Time to peak
= 11.97 hrs
Time interval
= 2 min
Hyd. volume
= 11,525 cuft
Drainage area
= 2.100 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 3.47 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
6.00
5.00
4.00
3.00
2.00
1.00
0.00 ' '
0 2 4
— Hyd No. 3
SD 1-16
Hyd. No. 3 -- 2 Year
6 8 10 12 14
Q (cfs)
6.00
5.00
4.00
3.00
2.00
1.00
' 0.00
16 18 20 22 24 26
Time (hrs)

Hydrograph Report
11
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 4
SD 1-19
Hydrograph type
= SCS Runoff
Storm frequency
= 2 yrs
Time interval
= 2 min
Drainage area
= 0.400 ac
Basin Slope
= 0.0 %
Tc method
= User
Total precip.
= 3.47 in
Storm duration
= 24 hrs
Q (cfs)
2.00
1.00
e
2 4
Hyd No. 4
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
SD 1-19
Hyd. No. 4 -- 2 Year
Tuesday, 06 / 29 / 2021
= 1.089 cfs
= 11.97 hrs
= 2,195 cuft
= 80
= 0 ft
= 5.00 min
= Type II
= 484
6 8 10 12 14 16 18 20 22 24
Q (cfs)
2.00
1.00
1 0.00
26
Time (hrs)

12
Hydrograph
Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 /
29 / 2021
Hyd. No. 5
SD 1-21
Hydrograph type
= SCS Runoff
Peak discharge
= 2.450 cfs
Storm frequency
= 2 yrs
Time to peak
= 11.97 hrs
Time interval
= 2 min
Hyd. volume
= 4,939 cuft
Drainage area
= 0.900 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 3.47 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
SD 1-21
Q (cfs)
Hyd. No. 5 -- 2 Year
Q (cfs)
3.00
3.00
2.00
2.00
1.00
1.00
0.00
0.00
0 2 4 6 8 10 12 14
16 18 20 22
24 26
Hyd No. 5
Time (hrs)

Hydrograph Summary Report
13
Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
9.357
2
716
19,044
------
------
------
SD 1-07
2
SCS Runoff
33.49
2
716
68,157
------
------
------
SD 1-09
3
SCS Runoff
10.34
2
716
21,049
------
------
------
SD 1-16
4
SCS Runoff
1.970
2
716
4,009
------
------
------
SD 1-19
5
SCS Runoff
4.432
2
716
9,021
------
------
------
SD 1-21
CADPR Dropbox\ Projects\Active\2020\200
5F&ihreRE fd-On` iterStudio-Ca
aTrrte gdaylr®SV=F 'EC\STORM\20055-SD
Desk

14
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 1
SD 1-07
Hydrograph type
= SCS Runoff
Peak discharge
= 9.357 cfs
Storm frequency
= 10 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 19,044 cuft
Drainage area
= 1.900 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 5.06 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
10.00
4.00
2.00
e
SD 1-07
Hyd. No. 1 -- 10 Year
2 4 6 8 10 12 14
Hyd No. 1
Q (cfs)
10.00
We
4.00
2.00
0.00
16 18 20 22 24
Time (hrs)

Hydrograph
Report
15
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 2
SD 1-09
Hydrograph type = SCS Runoff
Storm frequency = 10 yrs
Time interval = 2 min
Drainage area = 6.800 ac
Basin Slope = 0.0 %
Tc method = User
Total precip. = 5.06 in
Storm duration = 24 hrs
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
Tuesday, 06 /
= 33.49 cfs
= 11.93 hrs
= 68,157 cuft
= 80
= 0 ft
= 5.00 min
= Type II
= 484
29 / 2021
Q (cfs)
35.00
SD 1-09
Hyd. No. 2 -- 10 Year
Q (cfs)
35.00
30.00
30.00
25.00
25.00
20.00
20.00
15.00
15.00
10.00
10.00
5.00
5.00
0.00
0 2
— Hyd No.
4 6 8 10 12 14
2
16 18 20
0.00
22 24
Time (hrs)

16
Hydrograph
Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 3
SD 1-16
Hydrograph type
= SCS Runoff
Peak discharge
= 10.34 cfs
Storm frequency
= 10 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 21,049 cuft
Drainage area
= 2.100 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 5.06 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
SD 1-16
Q (cfs)
Hyd. No. 3 -- 10 Year
Q (cfs)
12.00
12.00
10.00
10.00
8.00
8.00
6.00
6.00
4.00
4.00
2.00
2.00
0.00
0.00
0 2
4 6 8 10 12 14
16 18 20
22 24
Hyd No.
3
Time (hrs)

Hydrograph Report
17
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 4
SD 1-19
Hydrograph type
= SCS Runoff
Storm frequency
= 10 yrs
Time interval
= 2 min
Drainage area
= 0.400 ac
Basin Slope
= 0.0 %
Tc method
= User
Total precip.
= 5.06 in
Storm duration
= 24 hrs
Q (cfs)
2.00
1.00
e
2
Hyd No. 4
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
SD 1-19
Hyd. No. 4 -- 10 Year
Tuesday, 06 / 29 / 2021
= 1.970 cfs
= 11.93 hrs
= 4,009 cuft
= 80
= 0 ft
= 5.00 min
= Type II
= 484
4 6 8 10 12 14 16 18 20 22
Q (cfs)
2.00
1.00
--" 0.00
24
Time (hrs)

Hydrograph
Report
18
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 5
SD 1-21
Hydrograph type = SCS Runoff
Storm frequency = 10 yrs
Time interval = 2 min
Drainage area = 0.900 ac
Basin Slope = 0.0 %
Tc method = User
Total precip. = 5.06 in
Storm duration = 24 hrs
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
Tuesday, 06 /
= 4.432 cfs
= 11.93 hrs
= 9,021 cuft
= 80
= 0 ft
= 5.00 min
= Type II
= 484
29 / 2021
Q (cfs)
5.00
SD 1-21
Hyd. No. 5 -- 10 Year
Q (cfs)
5.00
4.00
4.00
3.00
3.00
2.00
2.00
1.00
1.00
0.00
0 2
— Hyd No.
0.00
4 6 8 10 12 14 16 18 20 22 24
5 Time (hrs)

Hydrograph Summary Report
19
Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
11.94
2
716
24,508
------
------
------
SD 1-07
2
SCS Runoff
42.73
2
716
87,712
------
------
------
SD 1-09
3
SCS Runoff
13.20
2
716
27,087
------
------
------
SD 1-16
4
SCS Runoff
2.514
2
716
5,160
------
------
------
SD 1-19
5
SCS Runoff
5.655
2
716
11,609
------
------
------
SD 1-21
CADPR Dropbox\ Projects\Active\2020\200
5F&ihreRE fe-5n` iterStudio-Ca
aTrrte gdaylr®SV=F 'EC\STORM\20055-SD
Desk

20
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 1
SD 1-07
Hydrograph type
= SCS Runoff
Peak discharge
= 11.94 cfs
Storm frequency
= 25 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 24,508 cuft
Drainage area
= 1.900 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 6.01 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
12.00
10.00
8.00
6.00
4.00
2.00
0.00
0.0 2.0 4.0 6.0
Hyd No. 1
SD 1-07
Hyd. No. 1 -- 25 Year
Q (cfs)
12.00
10.00
M
M
4.00
2.00
' ' 0.00
8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

21
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 2
SD 1-09
Hydrograph type
= SCS Runoff
Peak discharge
= 42.73 cfs
Storm frequency
= 25 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 87,712 cuft
Drainage area
= 6.800 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 6.01 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
50.00
40.00
30.00
20.00
10.00
0.00 ' '
0.0 2.0 4.0
— Hyd No. 2
6.0 8.0
SD 1-09
Hyd. No. 2 -- 25 Year
Q (cfs)
50.00
40.00
30.00
20.00
10.00
--r— ' ' 0.00
10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

22
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 3
SD 1-16
Hydrograph type
= SCS Runoff
Peak discharge
= 13.20 cfs
Storm frequency
= 25 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 27,087 cuft
Drainage area
= 2.100 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 6.01 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
14.00
12.00
10.00
8.00
6.00
4.00
2.00
0.00
0.0 2.0 4.0 6.0
Hyd No. 3
SD 1-16
Hyd. No. 3 -- 25 Year
Q (cfs)
14.00
12.00
10.00
4.00
2.00
' 0.00
8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

Hydrograph
Report
23
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 4
SD 1-19
Hydrograph type = SCS Runoff
Storm frequency = 25 yrs
Time interval = 2 min
Drainage area = 0.400 ac
Basin Slope = 0.0 %
Tc method = User
Total precip. = 6.01 in
Storm duration = 24 hrs
Peak discharge =
Time to peak =
Hyd. volume =
Curve number =
Hydraulic length =
Time of conc. (Tc) =
Distribution =
Shape factor =
Tuesday, 06 / 29
2.514 cfs
11.93 hrs
5,160 cuft
80
0 ft
5.00 min
Type II
484
/ 2021
Q (cfs)
SD 1-19
Hyd. No. 4 -- 25
Year
Q (cfs)
3.00
2.00
3.00
2.00
1.00
1.00
0.00
0.0 2.0
Hyd No.
4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0
4
20.0 22.0
Time
0.00
(hrs)

24
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 5
SD 1-21
Hydrograph type
= SCS Runoff
Peak discharge
= 5.655 cfs
Storm frequency
= 25 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 11,609 cuft
Drainage area
= 0.900 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 6.01 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
6.00
5.00
4.00
3.00
2.00
1.00
0.00 ' '
0.0 2.0 4.0
— Hyd No. 5
6.0 8.0
SD 1-21
Hyd. No. 5 -- 25 Year
Q (cfs)
6.00
5.00
4.00
3.00
2.00
1.00
T ' ' 0.00
10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

Hydrograph Summary Report
25
Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
13.99
2
716
28,925
------
------
------
SD 1-07
2
SCS Runoff
50.08
2
716
103,522
------
------
------
SD 1-09
3
SCS Runoff
15.46
2
716
31,970
------
------
------
SD 1-16
4
SCS Runoff
2.946
2
716
6,090
------
------
------
SD 1-19
5
SCS Runoff
6.628
2
716
13,701
------
------
------
SD 1-21
CADPR Dropbox\ Projects\Active\2020\200
5F&ihreRE f66n` iterStudio-Ca
aTrrte gdaylr®SV=F 'EC\STORM\20055-SD
Desk

26
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 1
SD 1-07
Hydrograph type
= SCS Runoff
Peak discharge
= 13.99 cfs
Storm frequency
= 50 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 28,925 cuft
Drainage area
= 1.900 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 6.76 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
14.00
12.00
10.00
8.00
6.00
4.00
2.00
0.00
0.0 2.0 4.0 6.0
Hyd No. 1
SD 1-07
Hyd. No. 1 -- 50 Year
Q (cfs)
14.00
12.00
10.00
4.00
2.00
1� ' ' 0.00
8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

Hydrograph Report
27
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 2
SD 1-09
Hydrograph type
= SCS Runoff
Storm frequency
= 50 yrs
Time interval
= 2 min
Drainage area
= 6.800 ac
Basin Slope
= 0.0 %
Tc method
= User
Total precip.
= 6.76 in
Storm duration
= 24 hrs
Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
0.00
0.0 2.0 4.0
- Hyd No. 2
6.0 8.0
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
SD 1-09
Hyd. No. 2 -- 50 Year
Tuesday, 06 / 29 / 2021
= 50.08 cfs
= 11.93 hrs
= 103,522 cuft
= 80
= 0 ft
= 5.00 min
= Type II
= 484
Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
T ' ' 0.00
10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

28
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 3
SD 1-16
Hydrograph type
= SCS Runoff
Peak discharge
= 15.46 cfs
Storm frequency
= 50 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 31,970 cuft
Drainage area
= 2.100 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 6.76 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
18.00
15.00
12.00
•M
.M
3.00
SD 1-16
Hyd. No. 3 -- 50 Year
Q (cfs)
18.00
15.00
12.00
M
M
3.00
0.00 ' ' ' 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Hyd No. 3 Time (hrs)

29
Hydrograph
Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29
/ 2021
Hyd. No. 4
SD 1-19
Hydrograph type
= SCS Runoff
Peak discharge =
2.946 cfs
Storm frequency
= 50 yrs
Time to peak =
11.93 hrs
Time interval
= 2 min
Hyd. volume =
6,090 cuft
Drainage area
= 0.400 ac
Curve number =
80
Basin Slope
= 0.0 %
Hydraulic length =
0 ft
Tc method
= User
Time of conc. (Tc) =
5.00 min
Total precip.
= 6.76 in
Distribution =
Type II
Storm duration
= 24 hrs
Shape factor =
484
SD 1-19
Q (cfs)
Hyd. No. 4 -- 50
Year
Q (cfs)
3.00
3.00
2.00
2.00
1.00
1.00
0.00
0.00
0.0 2.0
4.0 6.0 8.0 10.0 12.0
14.0 16.0 18.0
20.0 22.0
Hyd No.
4
Time
(hrs)

30
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 5
SD 1-21
Hydrograph type
= SCS Runoff
Peak discharge
= 6.628 cfs
Storm frequency
= 50 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 13,701 cuft
Drainage area
= 0.900 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 6.76 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
7.00
M. 11
5.00
4.00
3.00
2.00
1.00
0.00 ' '
0.0 2.0 4.0
— Hyd No. 5
6.0
SD 1-21
Hyd. No. 5 -- 50 Year
Q (cfs)
7.00
5.00
4.00
3.00
2.00
1.00
-ter 0.00
8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

Hydrograph Summary Report
31
Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
1
SCS Runoff
16.13
2
716
33,591
------
------
------
SD 1-07
2
SCS Runoff
57.74
2
716
120,222
------
------
------
SD 1-09
3
SCS Runoff
17.83
2
716
37,127
------
------
------
SD 1-16
4
SCS Runoff
3.396
2
716
7,072
------
------
------
SD 1-19
5
SCS Runoff
7.641
2
716
15,912
------
------
------
SD 1-21
CADPR Dropbox\ Projects\Active\2020\200
5F&hihre;gd td-OOsVe.13tudio-Ca
aTrrte gdaylr®SV=F 'EC\STORM\20055-SD
Desk

Hydrograph
Report
32
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 1
SD 1-07
Hydrograph type = SCS Runoff
Storm frequency = 100 yrs
Time interval = 2 min
Drainage area = 1.900 ac
Basin Slope = 0.0 %
Tc method = User
Total precip. = 7.54 in
Storm duration = 24 hrs
Peak discharge =
Time to peak =
Hyd. volume =
Curve number =
Hydraulic length =
Time of conc. (Tc) =
Distribution =
Shape factor =
Tuesday, 06 / 29
16.13 cfs
11.93 hrs
33,591 cuft
80
0 ft
5.00 min
Type II
484
/ 2021
Q (cfs)
18.00
SD 1-07
Hyd. No. 1 -- 100 Year
Q (cfs)
18.00
15.00
15.00
12.00
9.00
12.00
9.00
6.00
6.00
3.00
0.00
0.0 2.0
Hyd No.
4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0
1
20.0 22.0
Time
3.00
0.00
(hrs)

Hydrograph Report
33
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Hyd. No. 2
SD 1-09
Hydrograph type
= SCS Runoff
Storm frequency
= 100 yrs
Time interval
= 2 min
Drainage area
= 6.800 ac
Basin Slope
= 0.0 %
Tc method
= User
Total precip.
= 7.54 in
Storm duration
= 24 hrs
Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
0.00 ' '
0.0 2.0 4.0
- Hyd No. 2
6.0 8.0
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
SD 1-09
Hyd. No. 2 -- 100 Year
Tuesday, 06 / 29 / 2021
= 57.74 cfs
= 11.93 hrs
= 120,222 cuft
= 80
= 0 ft
= 5.00 min
= Type II
= 484
Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
-7- ' ' 0.00
10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

34
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 3
SD 1-16
Hydrograph type
= SCS Runoff
Peak discharge
= 17.83 cfs
Storm frequency
= 100 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 37,127 cuft
Drainage area
= 2.100 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 7.54 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
18.00
15.00
12.00
•M
.M
3.00
SD 1-16
Hyd. No. 3 -- 100 Year
Q (cfs)
18.00
15.00
12.00
M
M
3.00
0.00 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Hyd No. 3 Time (hrs)

35
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 4
SD 1-19
Hydrograph type
= SCS Runoff
Peak discharge
= 3.396 cfs
Storm frequency
= 100 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 7,072 cuft
Drainage area
= 0.400 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 7.54 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
4.00
3.00
2.00
1.00
0.00
0.0 2.0 4.0
— Hyd No. 4
6.0 8.0
SD 1-19
Hyd. No. 4 -- 100 Year
Q (cfs)
4.00
3.00
2.00
1.00
T ' ' 0.00
10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

36
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
Hyd. No. 5
SD 1-21
Hydrograph type
= SCS Runoff
Peak discharge
= 7.641 cfs
Storm frequency
= 100 yrs
Time to peak
= 11.93 hrs
Time interval
= 2 min
Hyd. volume
= 15,912 cuft
Drainage area
= 0.900 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 5.00 min
Total precip.
= 7.54 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
8.00
.M
4.00
2.00
0.00 ' '
0.0 2.0 4.0
— Hyd No. 5
6.0 8.0
SD 1-21
Hyd. No. 5 -- 100 Year
Q (cfs)
8.00
M
4.00
2.00
-7- ' ' 0.00
10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)

Hydraf4eojTtableoe cContEEeint situ Studio-Cabarrus\CALCS\STORM+EC\STORM\20055-SD Design Hydraflow.gpw
Hydraflow Hydrographs Extension for Autodesk0 Civil 3DO by Autodesk, Inc. v2021
Tuesday, 06 / 29 / 2021
1 -Year
SummaryReport
.........................................................................................................................
1
HydrographReports...................................................................................................................
2
Hydrograph No.
1, SCS Runoff, SD 1-07
.................................................................................
2
Hydrograph No.
2, SCS Runoff, SD 1-09
.................................................................................
3
Hydrograph No.
3, SCS Runoff, SD 1-16
.................................................................................
4
Hydrograph No.
4, SCS Runoff, SD 1-19
.................................................................................
5
Hydrograph No.
5, SCS Runoff, SD 1-21
.................................................................................
6
2 - Year
SummaryReport
.........................................................................................................................
7
HydrographReports...................................................................................................................
8
Hydrograph No.
1, SCS Runoff, SD 1-07
.................................................................................
8
Hydrograph No.
2, SCS Runoff, SD 1-09
.................................................................................
9
Hydrograph No.
3, SCS Runoff, SD 1-16
...............................................................................
10
Hydrograph No.
4, SCS Runoff, SD 1-19
...............................................................................
11
Hydrograph No.
5, SCS Runoff, SD 1-21
...............................................................................
12
10 - Year
SummaryReport
.......................................................................................................................
13
HydrographReports.................................................................................................................
14
Hydrograph No.
1, SCS Runoff, SD 1-07
...............................................................................
14
Hydrograph No.
2, SCS Runoff, SD 1-09
...............................................................................
15
Hydrograph No.
3, SCS Runoff, SD 1-16
...............................................................................
16
Hydrograph No.
4, SCS Runoff, SD 1-19
...............................................................................
17
Hydrograph No.
5, SCS Runoff, SD 1-21
...............................................................................
18
25 - Year
SummaryReport
.......................................................................................................................
19
HydrographReports.................................................................................................................
20
Hydrograph No.
1, SCS Runoff, SD 1-07
...............................................................................
20
Hydrograph No.
2, SCS Runoff, SD 1-09
...............................................................................
21
Hydrograph No.
3, SCS Runoff, SD 1-16
...............................................................................
22
Hydrograph No.
4, SCS Runoff, SD 1-19
...............................................................................
23
Hydrograph No.
5, SCS Runoff, SD 1-21
...............................................................................
24
50 - Year
SummaryReport
.......................................................................................................................
25
HydrographReports.................................................................................................................
26
Hydrograph No.
1, SCS Runoff, SD 1-07
...............................................................................
26
Hydrograph No.
2, SCS Runoff, SD 1-09
...............................................................................
27
Hydrograph No.
3, SCS Runoff, SD 1-16
...............................................................................
28
Hydrograph No.
4, SCS Runoff, SD 1-19
...............................................................................
29
Hydrograph No.
5, SCS Runoff, SD 1-21
...............................................................................
30
100 -Year
SummaryReport....................................................................................................................... 31
HydrographReports................................................................................................................. 32

CO, l\ a Ur Q HjlLlBd,,\2020\20055 Brothers Estate-Insitu Studio-Cabarrus\CALCS\STORM+EC\STORM\20055-SD Design Hydraflow.gpw
Hydrograph No.
1, SCS Runoff, SD 1-07
...............................................................................
32
Hydrograph No.
2, SCS Runoff, SD 1-09
...............................................................................
33
Hydrograph No.
3, SCS Runoff, SD 1-16
...............................................................................
34
Hydrograph No.
4, SCS Runoff, SD 1-19
...............................................................................
35
Hydrograph No.
5, SCS Runoff, SD 1-21
...............................................................................
36

Hydraflow Storm Sewers Extension for Autodesk® Civil 3D® Plan
Project File: SD 1-07 TO 1-08.stm
Outfall
Number of lines: 1 1 Date: 6/30/2021
Storm Sewers v2021.00

Design
Page 1
Line
No.
Inlet
ID
Gnd/Rim
El Up
(ft)
Invert
Up
(ft)
Invent
Dn
(ft)
Drng
Area
(ac)
i
Inlet
(in/hr)
Runoff
Coeff
(C)
Incr
Q
(cfs)
Q
Carry
(cfs)
Total
Runoff
(cfs)
n-val
Pipe
Line
Size
(in)
Line
Length
(ft)
Line
Slope
(%
Capac
Full
(cfs)
Vel
Dn
(ft/s)
Cover
Dn
(ft)
HGL
Jnct
(ft)
Junct
Type
DnStm
Ln No
1
1-07
646.50
643.50
643.00
1.9
9.83
0.50
9.34
0.00
9.34
0.012
18
33.439
1.5
13.91
6.26
1.7
644.68
Grate
Outfalf
Project File: SD 1-07 TO 1-08.stm
Number of lines: 1
Date: 6/30/2021
NOTES: Intensity = 127.16 / (Inlet time + 17.80) ^ 0.82 -- Return period = 100 Yrs. ; "" Critical depth
Storm Sewers

Culvert Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SD PIPE 1-09 (25-YR)
Invert Elev Dn (ft)
= 623.00
Calculations
Pipe Length (ft)
= 50.00
Qmin (cfs)
Slope (%)
= 1.00
Qmax (cfs)
Invert Elev Up (ft)
= 623.50
Tailwater Elev (ft)
Rise (in)
= 36.0
Shape
= Circular
Highlighted
Span (in)
= 36.0
Qtotal (cfs)
No. Barrels
= 1
Qpipe (cfs)
n-Value
= 0.012
Qovertop (cfs)
Culvert Type
= Circular Concrete
Veloc Dn (ft/s)
Culvert Entrance
= Groove end w/headwall (C)
Veloc Up (ft/s)
Coeff. K,M,c,Y,k
= 0.0018, 2, 0.0292, 0.74, 0.2
HGL Dn (ft)
HGL Up (ft)
Embankment
Hw Elev (ft)
Top Elevation (ft)
= 629.00
Hw/D (ft)
Top Width (ft)
= 24.00
Flow Regime
Crest Width (ft)
= 10.00
Wednesday, Jun 30 2021
= 43.00
= 43.00
= (dc+D)/2
= 43.00
= 43.00
= 0.00
= 6.68
= 7.99
= 625.57
= 625.63
= 626.79
= 1.10
= Inlet Control
El—(fl) SD PIPE 0•
Circular Culvert HGL Embank
Reach (ft)
Circular Culvert HGL Embank
Reach (ft)

Culvert Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SD PIPE 1-09 (25-YR)
Invert Elev Dn (ft)
= 623.00
Calculations
Pipe Length (ft)
= 50.00
Qmin (cfs)
Slope (%)
= 1.00
Qmax (cfs)
Invert Elev Up (ft)
= 623.50
Tailwater Elev (ft)
Rise (in)
= 36.0
Shape
= Circular
Highlighted
Span (in)
= 36.0
Qtotal (cfs)
No. Barrels
= 1
Qpipe (cfs)
n-Value
= 0.012
Qovertop (cfs)
Culvert Type
= Circular Concrete
Veloc Dn (ft/s)
Culvert Entrance
= Groove end w/headwall (C)
Veloc Up (ft/s)
Coeff. K,M,c,Y,k
= 0.0018, 2, 0.0292, 0.74, 0.2
HGL Dn (ft)
HGL Up (ft)
Embankment
Hw Elev (ft)
Top Elevation (ft)
= 629.00
Hw/D (ft)
Top Width (ft)
= 24.00
Flow Regime
Crest Width (ft)
= 10.00
El ev (ft)
630.00 -
629.00 -
628 00 -
627.00
626.OD -
625.110
624.00
623110 -
622 00 -
SD PIPE 1-09 (25-YR)
Circular Culvert HGL Embank
Wednesday, Jun 30 2021
= 58.00
= 58.00
= (dc+D)/2
= 58.00
= 58.00
= 0.00
= 8.58
= 9.34
= 625.73
= 625.96
= 627.67
= 1.39
= Inlet Control
H. DIepth (ft)
6.5D
5.5D
450
3.50
2.5D
1 50
0.50
-0 50
-150
Reach (ft)

Hydraflow Storm Sewers Extension for Autodesk® Civil 3D® Plan
1-13
1
2
1-11
Outfall
3
1-12
Project File: SD 1-11 TO 1-14.stm Number of lines: 3 Date: 6/30/2021
Storm Sewers v2021.00

Design
Page 1
Line
Inlet
Gnd/Rim
Invert
Invent
Drng
i
Runoff
Incr
Q
Total
n-val
Line
Line
Line
Capac
Vel
Cover
HGL
Junct
DnStm
No.
ID
El Up
Up
Dn
Area
Inlet
Coeff
Q
Carry
Runoff
Pipe
Size
Length
Slope
Full
Dn
Dn
Jnct
Type
Ln No
(ft)
(ft)
(ft)
(ac)
(in/hr)
(C)
(cfs)
(cfs)
(cfs)
(in)
(ft)
( 0
(cfs)
(ft/s)
(ft)
(ft)
3
1-11
633.50
631.50
631.20
0.50
9.07
0.50
2.27
0.00
2.27
0.012
12
48.490
0.62
3.03
2.89
1.3C
632.92
Grate
2
2
1-12
633.50
631.00
630.60
0.20
9.07
0.50
0.91
0.00
3.13
0.012
12
75.058
0.53
2.82
3.99
1.9C
632.62
Grate
1
1
1-13
633.50
630.40
630.00
0.10
9.07
0.50
0.45
0.00
3.53
0.012
12
55.631
0.72
3.27
5.23
0.67
631.83
Grate
Outfalf
Project File: SD 1-11 TO 1-14.stm
Number of lines: 3
Date: 6/30/2021
NOTES: Intensity = 51.90 / (Inlet time + 9.20) ^ 0.66 -- Return period = 100 Yrs. ; "" Critical depth
Storm Sewers

Hydraflow Storm Sewers Extension for Autodesk® Civil 3D® Plan
Outfall
1
1-16
Project File: SD 1-16 TO 1-17.stm Number of lines: 1 Date: 6/30/2021
Storm Sewers v2021.00

Design
Page 1
Line
No.
Inlet
ID
Gnd/Rim
El Up
(ft)
Invert
Up
(ft)
Invent
Dn
(ft)
Drng
Area
(ac)
i
Inlet
(in/hr)
Runoff
Coeff
(C)
Incr
Q
(cfs)
Q
Carry
(cfs)
Total
Runoff
(cfs)
n-val
Pipe
Line
Size
(in)
Line
Length
(ft)
Line
Slope
(%
Capac
Full
(cfs)
Vel
Dn
(ft/s)
Cover
Dn
(ft)
HGL
Jnct
(ft)
Junct
Type
DnStm
Ln No
1
1-16
636.50
633.50
633.00
2.10
9.07
0.50
9.52
0.00
9.52
0.012
18
41.669
1.2
12.46
6.33
2.69
634.69
Grate
Outfalf
Project File: SD 1-16 TO 1-17.stm
Number of lines: 1
Date: 6/30/2021
NOTES: Intensity = 51.90 / (Inlet time + 9.20) ^ 0.66 -- Return period = 100 Yrs. ; "" Critical depth
Storm Sewers

Hydraflow Storm Sewers Extension for Autodesk® Civil 3D® Plan
Outfall
Project File: SD 1-19 TO 1-20.stm
1-19
Number of lines: 1 1 Date: 6/30/2021
Storm Sewers v2021.00

Design
Page 1
Line
No.
Inlet
ID
Gnd/Rim
El Up
(ft)
Invert
Up
(ft)
Invent
Dn
(ft)
Drng
Area
(ac)
i
Inlet
(in/hr)
Runoff
Coeff
(C)
Incr
Q
(cfs)
Q
Carry
(cfs)
Total
Runoff
(cfs)
n-val
Pipe
Line
Size
(in)
Line
Length
(ft)
Line
Slope
( 0
Capac
Full
(cfs)
Vel
Dn
(ft/s)
Cover
Dn
(ft)
HGL
Jnct
(ft)
Junct
Type
DnStm
Ln No
1
1-19
632.83
631.00
630.50
0.40
9.07
0.50
1.81
0.00
1.81
0.012
12
33.025
1.51
4.75
3.90
0.67
631.57
Dp-Grate
Outfalf
Project File: SD 1-19 TO 1-20.stm
Number of lines: 1
Date: 6/30/2021
NOTES: Intensity = 51.90 / (Inlet time + 9.20) ^ 0.66 -- Return period = 100 Yrs. ; "" Critical depth
Storm Sewers