SW4201201_(2020.12.10) Coldwater Combined Calc Book_20201221

CIVIL ENGINEERING | ENVIRONMENTAL | SURVEYING | GIS | LANDSCAPE ARCHITECTURE | CONSTRUCTION SERVICES
8642 W. Market Street
Suite 136
Greensboro, NC 27409

P 336.662.0411
F 336.662.0420
www.timmons.com

STORM DRAINAGE
CALCULATIONS

Coldwater

8228 Coldwater Road,
Stokesdale, NC 27357

Timmons Group Project No. 44636

August 21, 2020
Revised October 9, 2020
Revised October 23, 2020
Revised December 10, 2020

Timmons Group, Inc.
8642 W. Market Street, Suite 136
Greensboro, NC 27409
Phone: [phone]Fax: [phone]
NOAA Atlas 14, Volume 2, Version 3
Location name: Stokesdale, North Carolina, USA*
Latitude: 36.295°, Longitude: -80.023°
Elevation: 797.42 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 | PF_graphical | Maps_&_aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)1
Duration Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min 4.43
(4.07‑4.82)
5.28
(4.85‑5.75)
6.20
(5.69‑6.76)
6.83
(6.25‑7.42)
7.54
(6.89‑8.18)
8.00
(7.26‑8.69)
8.42
(7.61‑9.14)
8.77
(7.88‑9.55)
9.14
(8.16‑9.97)
9.40
(8.30‑10.3)
10-min 3.54
(3.25‑3.85)
4.22
(3.88‑4.60)
4.96
(4.56‑5.41)
5.46
(5.00‑5.93)
6.01
(5.48‑6.52)
6.37
(5.78‑6.92)
6.69
(6.05‑7.27)
6.95
(6.25‑7.57)
7.24
(6.45‑7.89)
7.40
(6.54‑8.08)
15-min 2.95
(2.71‑3.21)
3.54
(3.25‑3.85)
4.18
(3.84‑4.56)
4.60
(4.22‑5.00)
5.08
(4.63‑5.51)
5.38
(4.88‑5.84)
5.64
(5.10‑6.12)
5.85
(5.26‑6.36)
6.07
(5.41‑6.62)
6.19
(5.47‑6.76)
30-min 2.02
(1.86‑2.20)
2.44
(2.25‑2.66)
2.97
(2.73‑3.24)
3.33
(3.06‑3.62)
3.76
(3.43‑4.08)
4.05
(3.68‑4.40)
4.32
(3.90‑4.69)
4.55
(4.09‑4.95)
4.83
(4.31‑5.27)
5.01
(4.43‑5.47)
60-min 1.26
(1.16‑1.37)
1.53
(1.41‑1.67)
1.91
(1.75‑2.08)
2.17
(1.99‑2.36)
2.50
(2.29‑2.72)
2.74
(2.49‑2.98)
2.97
(2.69‑3.23)
3.19
(2.87‑3.47)
3.47
(3.09‑3.78)
3.66
(3.23‑3.99)
2-hr 0.746
(0.686‑0.816)
0.908
(0.832‑0.992)
1.14
(1.04‑1.24)
1.31
(1.20‑1.43)
1.53
(1.39‑1.67)
1.70
(1.54‑1.85)
1.87
(1.68‑2.03)
2.04
(1.81‑2.21)
2.25
(1.98‑2.45)
2.41
(2.10‑2.63)
3-hr 0.535
(0.492‑0.584)
0.651
(0.600‑0.712)
0.818
(0.751‑0.891)
0.941
(0.862‑1.02)
1.10
(1.00‑1.20)
1.22
(1.11‑1.33)
1.35
(1.21‑1.46)
1.47
(1.31‑1.59)
1.62
(1.43‑1.76)
1.74
(1.52‑1.89)
6-hr 0.329
(0.304‑0.360)
0.399
(0.368‑0.436)
0.500
(0.460‑0.546)
0.578
(0.529‑0.630)
0.684
(0.622‑0.743)
0.768
(0.693‑0.834)
0.854
(0.764‑0.926)
0.942
(0.833‑1.02)
1.06
(0.925‑1.15)
1.16
(0.993‑1.25)
12-hr 0.196
(0.181‑0.215)
0.238
(0.218‑0.261)
0.299
(0.274‑0.327)
0.349
(0.318‑0.380)
0.418
(0.378‑0.454)
0.474
(0.425‑0.513)
0.534
(0.474‑0.577)
0.596
(0.523‑0.644)
0.686
(0.590‑0.741)
0.757
(0.640‑0.819)
24-hr 0.118
(0.109‑0.127)
0.142
(0.132‑0.154)
0.180
(0.166‑0.194)
0.210
(0.194‑0.227)
0.254
(0.233‑0.273)
0.290
(0.264‑0.311)
0.328
(0.298‑0.353)
0.369
(0.332‑0.397)
0.428
(0.382‑0.461)
0.477
(0.421‑0.515)
2-day 0.069
(0.064‑0.074)
0.083
(0.077‑0.089)
0.104
(0.097‑0.112)
0.121
(0.112‑0.130)
0.144
(0.133‑0.155)
0.163
(0.150‑0.175)
0.183
(0.168‑0.197)
0.204
(0.186‑0.220)
0.234
(0.211‑0.252)
0.258
(0.231‑0.279)
3-day 0.049
(0.045‑0.052)
0.059
(0.055‑0.063)
0.073
(0.068‑0.079)
0.085
(0.079‑0.091)
0.102
(0.094‑0.109)
0.115
(0.106‑0.123)
0.129
(0.118‑0.138)
0.144
(0.131‑0.155)
0.165
(0.149‑0.178)
0.182
(0.163‑0.197)
4-day 0.038
(0.036‑0.041)
0.046
(0.043‑0.050)
0.058
(0.054‑0.062)
0.067
(0.063‑0.072)
0.080
(0.074‑0.086)
0.091
(0.084‑0.097)
0.102
(0.094‑0.109)
0.114
(0.104‑0.122)
0.130
(0.118‑0.140)
0.144
(0.129‑0.155)
7-day 0.025
(0.024‑0.027)
0.030
(0.028‑0.032)
0.037
(0.035‑0.040)
0.043
(0.040‑0.045)
0.051
(0.047‑0.054)
0.057
(0.053‑0.061)
0.064
(0.059‑0.068)
0.071
(0.065‑0.075)
0.080
(0.073‑0.086)
0.088
(0.079‑0.095)
10-day 0.020
(0.019‑0.021)
0.024
(0.022‑0.025)
0.029
(0.027‑0.031)
0.033
(0.031‑0.035)
0.039
(0.036‑0.041)
0.043
(0.040‑0.046)
0.048
(0.045‑0.051)
0.053
(0.049‑0.057)
0.060
(0.055‑0.064)
0.065
(0.059‑0.070)
20-day 0.013
(0.013‑0.014)
0.016
(0.015‑0.017)
0.019
(0.018‑0.020)
0.022
(0.020‑0.023)
0.025
(0.023‑0.026)
0.028
(0.026‑0.029)
0.030
(0.028‑0.032)
0.033
(0.031‑0.035)
0.037
(0.034‑0.039)
0.040
(0.036‑0.042)
30-day 0.011
(0.011‑0.012)
0.013
(0.012‑0.014)
0.015
(0.015‑0.016)
0.017
(0.016‑0.018)
0.019
(0.018‑0.020)
0.021
(0.020‑0.022)
0.023
(0.021‑0.024)
0.024
(0.023‑0.026)
0.027
(0.025‑0.028)
0.028
(0.026‑0.030)
45-day 0.009
(0.009‑0.010)
0.011
(0.010‑0.012)
0.013
(0.012‑0.013)
0.014
(0.013‑0.015)
0.016
(0.015‑0.016)
0.017
(0.016‑0.018)
0.018
(0.017‑0.019)
0.019
(0.018‑0.020)
0.021
(0.020‑0.022)
0.022
(0.021‑0.023)
60-day 0.008
(0.008‑0.009)
0.010
(0.009‑0.010)
0.011
(0.011‑0.012)
0.012
(0.012‑0.013)
0.014
(0.013‑0.014)
0.015
(0.014‑0.015)
0.015
(0.015‑0.016)
0.016
(0.015‑0.017)
0.018
(0.016‑0.018)
0.018
(0.017‑0.019)
1 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.
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National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: [e-mail]
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100km
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Soil Map—Forsyth County, North Carolina
(Coldwater - forsyth co )
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/23/2019
Page 1 of 3401010040102004010300401040040105004010600401010040102004010300401040040105004010600585700585800585900586000586100586200586300586400586500586600586700
585700 585800 585900 586000 586100 586200 586300 586400 586500 586600 586700
36° 14' 14'' N 80° 2' 46'' W36° 14' 14'' N80° 2' 5'' W36° 13' 52'' N
80° 2' 46'' W36° 13' 52'' N
80° 2' 5'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
0 200 400 800 1200
Feet
0 50 100 200 300
Meters
Map Scale: 1:4,690 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:15,800.
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: Forsyth County, North Carolina
Survey Area Data: Version 19, Sep 16, 2019
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Mar 27, 2015—Oct
16, 2017
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.
Soil Map—Forsyth County, North Carolina
(Coldwater - forsyth co )
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/23/2019
Page 2 of 3
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
DaA Dan River loam, 0 to 2 percent
slopes, frequently flooded
2.2 3.0%
FaC Fairview fine sandy loam, 6 to
10 percent slopes
25.5 34.0%
FaD Fairview fine sandy loam, 10 to
15 percent slopes
3.6 4.9%
FcC2 Fairview clay loam, 6 to 10
percent slopes, moderately
eroded
0.1 0.2%
FeE3 Fairview clay loam, 10 to 25
percent slopes, severely
eroded
3.8 5.1%
Gu Gullied land 19.9 26.7%
PcF2 Pacolet clay loam, 15 to 45
percent slopes, moderately
eroded
4.5 6.0%
PoC Poplar Forest fine sandy loam,
6 to 10 percent slopes
0.1 0.2%
PpC2 Poplar Forest clay loam, 6 to
10 percent slopes,
moderately eroded
8.4 11.2%
PpD2 Poplar Forest clay loam, 10 to
15 percent slopes,
moderately eroded
5.0 6.7%
W Water 1.5 2.0%
Totals for Area of Interest 74.8 100.0%
Soil Map—Forsyth County, North Carolina Coldwater - forsyth co
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/23/2019
Page 3 of 3
DEED LINE60'R/WR/WOHPOHPOHPXFORSYTH COUNTYGUILFORD COUNTYFORSYTH COUNTYGUILFORD COUNTY20' UTILITY EASEMENTOHPOHPOHP100-YR FLOODPLAIN
(ZONE AE)
100-YR
FLOODPLAIN
(ZONE AE)
24"
SYCAMORE
DEED LINE60'R/WR/WOHPOHPOHPXFORSYTH COUNTYGUILFORD COUNTYFORSYTH COUNTYGUILFORD COUNTY20' UTILITY EASEMENTOHPOHPOHP100-YR FLOODPLAIN
(ZONE AE)
100-YR
FLOODPLAIN
(ZONE AE)
24"
SYCAMORE
EP
800.38
EP
800.38
EP
800.11
EP
800.11
EP
800.11
EP
799.70
EP
800.18TW: 799.00
BW: 793.00
TW: 800.48
BW: 794.00
TW: 800.00
BW: 794.00
TW: 838.00
BW: 838.00
TW: 800.16
BW: 796.00
ELLIPTICAL CMP 9.5'X6'INV: 744.27
INLET 28
DRAINAGE AREA = 3.65 AC
Q10 = 12.23 CFS
Q25 = 13.46 CFS
INLET 25
DRAINAGE AREA = 1.10 AC
Q10 = 3.98 CFS
Q25 = 4.38 CFS
INLET 16B
DRAINAGE AREA = 3.67 AC
Q10 = 14.74 CFS
Q25 = 16.23 CFS
INLET 11B
DRAINAGE AREA = 6.26 AC
Q10 = 30.27 CFS
Q25 = 33.44 CFS
INLET C7
DRAINAGE AREA = 3.13 AC
Q10 = 11.42 CFS
Q25 = 12.57 CFS
INLET 16
DRAINAGE AREA = 0.72 AC
Q10 = 2.57 CFS
Q25 = 2.83 CFS
INLET 18
DRAINAGE AREA = 0.58 AC
Q10 = 2.24 CFS
Q25 = 2.47 CFS
INLET 11
DRAINAGE AREA = 4.01 AC
Q10 = 15.64 CFS
Q25 = 17.22 CFS
INLET 13
DRAINAGE AREA = 0.53 AC
Q10 = 2.04 CFS
Q25 = 2.24 CFS
INLET C4
DRAINAGE AREA = 15.84 AC
Q10 = 40.46 CFS
Q25 = 44.55 CFS
INLET C1
DRAINAGE AREA = 95.07 AC
Q10(TR55 METHOD) = 102.71 CFS
Q25(TR55 METHOD) = 158.65 CFS
INLET 6
DRAINAGE AREA = 4.90 AC
Q10 = 19.59 CFS
Q25 = 21.57 CFS
INLET 8
DRAINAGE AREA = 0.39 AC
Q10 = 1.53 CFS
Q25 = 1.69 CFS
C3.6 POST-DEVELOPMENT DRIANAGE MAPM. MARTIN
M. MARTIN
R. RINGLER
1" = 150'
JOB NO.
SHEET NO.
SCALE
DESIGNED BY
CHECKED BYDATEDRAWN BY
DATEREVISION DESCRIPTIONYOUR VISION ACHIEVED THROUGH OURS.These plans and associated documents are the exclusive property of TIMMONS GROUP and may not be reproduced in whole or in part and shall not be used for any purpose whatsoever, inclusive, but notlimited to construction, bidding, and/or construction staking without the express written consent of TIMMONS GROUP.8642 W. Market Street Suite 136 | Greensboro, NC 27409TEL [phone] FAX [phone] www.timmons.comNorth Carolina License No. C-1652THIS DRAWING PREPARED AT THEGREENSBORO OFFICES:\107\44636-Coldwater\DWG\Sheet\CD\C3.6 - DRAN.dwg | Plotted on 10/23/2020 10:03 AM | by Maegan Martin08/21/2020
COLDWATERGUILFORD AND FORSYTH COUNTY - NORTH CAROLINA44636
PRELIMINARY - NOT FOR
CONSTRUCTION
10/23/2020
10/09/2020RESUBMITTAL #110/23/2020RESUBMITTAL #20 300'
SCALE 1"=150'
150'NAD 83
1S
Entrance Culvert Area
2R
Entrance Culvert
Routing Diagram for Coldwater Culverts Analysis
Prepared by {enter your company name here}, Printed 8/7/2020
HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
Coldwater Culverts Analysis
Printed 8/7/2020Prepared by {enter your company name here}
Page 2HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area
(acres)
CN Description
(subcatchment-numbers)
1.830 95 (1S)
93.240 65 Woods/grass comb., Fair, HSG B (1S)
95.070 66 TOTAL AREA
Coldwater Culverts Analysis
Printed 8/7/2020Prepared by {enter your company name here}
Page 3HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Soil Listing (all nodes)
Area
(acres)
Soil
Group
Subcatchment
Numbers
0.000 HSG A
93.240 HSG B 1S
0.000 HSG C
0.000 HSG D
1.830 Other 1S
95.070 TOTAL AREA
Coldwater Culverts Analysis
Printed 8/7/2020Prepared by {enter your company name here}
Page 4HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Ground Covers (all nodes)
HSG-A
(acres)
HSG-B
(acres)
HSG-C
(acres)
HSG-D
(acres)
Other
(acres)
Total
(acres)
Ground
Cover
Subcatchment
Numbers
0.000 0.000 0.000 0.000 1.830 1.830 1S
0.000 93.240 0.000 0.000 0.000 93.240 Woods/grass comb., Fair 1S
0.000 93.240 0.000 0.000 1.830 95.070 TOTAL AREA
Type II 24-hr 25-yr Rainfall=6.09"Coldwater Culverts Analysis
Printed 8/7/2020Prepared by {enter your company name here}
Page 5HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Time span=5.00-150.00 hrs, dt=0.05 hrs, 2901 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=95.070 ac 0.00% Impervious Runoff Depth=2.51"Subcatchment 1S: Entrance Culvert Area
Flow Length=3,777' Tc=39.7 min CN=66 Runoff=165.54 cfs 19.863 af
Inflow=165.54 cfs 19.863 afReach 2R: Entrance Culvert
Outflow=165.54 cfs 19.863 af
Total Runoff Area = 95.070 ac Runoff Volume = 19.863 af Average Runoff Depth = 2.51"
100.00% Pervious = 95.070 ac 0.00% Impervious = 0.000 ac
Type II 24-hr 25-yr Rainfall=6.09"Coldwater Culverts Analysis
Printed 8/7/2020Prepared by {enter your company name here}
Page 6HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Summary for Subcatchment 1S: Entrance Culvert Area
Runoff = 165.54 cfs @ 12.38 hrs, Volume= 19.863 af, Depth= 2.51"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-150.00 hrs, dt= 0.05 hrs
Type II 24-hr 25-yr Rainfall=6.09"
Area (ac) CN Description
93.240 65 Woods/grass comb., Fair, HSG B
* 1.830 95
95.070 66 Weighted Average
95.070 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
16.9 300 0.0433 0.30 Sheet Flow, Sheet flow
Grass: Short n= 0.150 P2= 3.38"
19.6 1,477 0.0630 1.25 Shallow Concentrated Flow, Shallow COnc flow
Woodland Kv= 5.0 fps
3.2 2,000 0.0250 10.34 452.03 Channel Flow, Stream
Area= 43.7 sf Perim= 18.7' r= 2.34'
n= 0.040 Winding stream, pools & shoals
39.7 3,777 Total
Subcatchment 1S: Entrance Culvert Area
Runoff
Hydrograph
Time (hours)
1501451401351301251201151101051009590858075706560555045403530252015105Flow (cfs)180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Type II 24-hr
25-yr Rainfall=6.09"
Runoff Area=95.070 ac
Runoff Volume=19.863 af
Runoff Depth=2.51"
Flow Length=3,777'
Tc=39.7 min
CN=66
165.54 cfs
Type II 24-hr 25-yr Rainfall=6.09"Coldwater Culverts Analysis
Printed 8/7/2020Prepared by {enter your company name here}
Page 7HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Summary for Reach 2R: Entrance Culvert
[40] Hint: Not Described (Outflow=Inflow)
Inflow Area = 95.070 ac, 0.00% Impervious, Inflow Depth = 2.51" for 25-yr event
Inflow = 165.54 cfs @ 12.38 hrs, Volume= 19.863 af
Outflow = 165.54 cfs @ 12.38 hrs, Volume= 19.863 af, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+Trans method, Time Span= 5.00-150.00 hrs, dt= 0.05 hrs
Reach 2R: Entrance Culvert
Inflow
Outflow
Hydrograph
Time (hours)
150140130120110100908070605040302010Flow (cfs)180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=95.070 ac
165.54 cfs
165.54 cfs
Type II 24-hr 100-yr Rainfall=7.61"Coldwater Culverts Analysis
Printed 8/7/2020Prepared by {enter your company name here}
Page 8HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Time span=5.00-150.00 hrs, dt=0.05 hrs, 2901 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=95.070 ac 0.00% Impervious Runoff Depth=3.69"Subcatchment 1S: Entrance Culvert Area
Flow Length=3,777' Tc=39.7 min CN=66 Runoff=248.70 cfs 29.237 af
Inflow=248.70 cfs 29.237 afReach 2R: Entrance Culvert
Outflow=248.70 cfs 29.237 af
Total Runoff Area = 95.070 ac Runoff Volume = 29.237 af Average Runoff Depth = 3.69"
100.00% Pervious = 95.070 ac 0.00% Impervious = 0.000 ac
Type II 24-hr 100-yr Rainfall=7.61"Coldwater Culverts Analysis
Printed 8/7/2020Prepared by {enter your company name here}
Page 9HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Summary for Subcatchment 1S: Entrance Culvert Area
Runoff = 248.70 cfs @ 12.37 hrs, Volume= 29.237 af, Depth= 3.69"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-150.00 hrs, dt= 0.05 hrs
Type II 24-hr 100-yr Rainfall=7.61"
Area (ac) CN Description
93.240 65 Woods/grass comb., Fair, HSG B
* 1.830 95
95.070 66 Weighted Average
95.070 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
16.9 300 0.0433 0.30 Sheet Flow, Sheet flow
Grass: Short n= 0.150 P2= 3.38"
19.6 1,477 0.0630 1.25 Shallow Concentrated Flow, Shallow COnc flow
Woodland Kv= 5.0 fps
3.2 2,000 0.0250 10.34 452.03 Channel Flow, Stream
Area= 43.7 sf Perim= 18.7' r= 2.34'
n= 0.040 Winding stream, pools & shoals
39.7 3,777 Total
Subcatchment 1S: Entrance Culvert Area
Runoff
Hydrograph
Time (hours)
1501451401351301251201151101051009590858075706560555045403530252015105Flow (cfs)260
240
220
200
180
160
140
120
100
80
60
40
20
0
Type II 24-hr
100-yr Rainfall=7.61"
Runoff Area=95.070 ac
Runoff Volume=29.237 af
Runoff Depth=3.69"
Flow Length=3,777'
Tc=39.7 min
CN=66
248.70 cfs
Type II 24-hr 100-yr Rainfall=7.61"Coldwater Culverts Analysis
Printed 8/7/2020Prepared by {enter your company name here}
Page 10HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Summary for Reach 2R: Entrance Culvert
[40] Hint: Not Described (Outflow=Inflow)
Inflow Area = 95.070 ac, 0.00% Impervious, Inflow Depth = 3.69" for 100-yr event
Inflow = 248.70 cfs @ 12.37 hrs, Volume= 29.237 af
Outflow = 248.70 cfs @ 12.37 hrs, Volume= 29.237 af, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+Trans method, Time Span= 5.00-150.00 hrs, dt= 0.05 hrs
Reach 2R: Entrance Culvert
Inflow
Outflow
Hydrograph
Time (hours)
150140130120110100908070605040302010Flow (cfs)260
240
220
200
180
160
140
120
100
80
60
40
20
0
Inflow Area=95.070 ac
248.70 cfs
248.70 cfs
Type II 24-hr 25-yr Rainfall=6.09"Coldwater Culverts Analysis-Buried 1'
Printed 12/10/2020Prepared by {enter your company name here}
HydroCAD® 10.00-25 s/n 08663 © 2019 HydroCAD Software Solutions LLC
Summary for Reach 3R: New Arch Culvert - Buried 1'
[52] Hint: Inlet/Outlet conditions not evaluated
[55] Hint: Peak inflow is 103% of Manning's capacity
Inflow Area = 95.070 ac, 0.00% Impervious, Inflow Depth = 2.51" for 25-yr event
Inflow = 165.54 cfs @ 12.38 hrs, Volume= 19.863 af
Outflow = 165.44 cfs @ 12.38 hrs, Volume= 19.863 af, Atten= 0%, Lag= 0.1 min
Routing by Stor-Ind+Trans method, Time Span= 5.00-150.00 hrs, dt= 0.05 hrs
Max. Velocity= 7.83 fps, Min. Travel Time= 0.1 min
Avg. Velocity = 2.97 fps, Avg. Travel Time= 0.2 min
Peak Storage= 762 cf @ 12.38 hrs
Average Depth at Peak Storage= 4.35' above invert (3.35' above fill)
Bank-Full Depth= 5.08' above invert (4.08' above fill) Flow Area= 23.4 sf, Capacity= 160.94 cfs
84.0" W x 61.0" H, R=43.0"/92.3" Pipe Arch Pipe w/ 12.0" inside fill
n= 0.025 Corrugated metal
Length= 36.0' Slope= 0.0100 '/' (101 Elevation Intervals)
Inlet Invert= 746.26', Outlet Invert= 745.90'
Culvert Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Friday, Aug 7 2020
C4 Analysis - 25 YR
Invert Elev Dn (ft) = 759.29
Pipe Length (ft) = 100.25
Slope (%) = 2.70
Invert Elev Up (ft) = 762.00
Rise (in) = 36.0
Shape = Circular
Span (in) = 36.0
No. Barrels = 1
n-Value = 0.012
Culvert Type = Circular Concrete
Culvert Entrance = Square edge w/headwall (C)
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5
Embankment
Top Elevation (ft) = 771.00
Top Width (ft) = 50.00
Crest Width (ft) = 0.00
Calculations
Qmin (cfs) = 44.55
Qmax (cfs) = 44.55
Tailwater Elev (ft) = (dc+D)/2
Highlighted
Qtotal (cfs) = 44.55
Qpipe (cfs) = 44.55
Qovertop (cfs) = 0.00
Veloc Dn (ft/s) = 6.87
Veloc Up (ft/s) = 8.13
HGL Dn (ft) = 761.88
HGL Up (ft) = 764.17
Hw Elev (ft) = 765.55
Hw/D (ft) = 1.18
Flow Regime = Inlet Control
Culvert Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Friday, Oct 23 2020
C7 Analysis - 25 YR
Invert Elev Dn (ft) = 806.15
Pipe Length (ft) = 113.47
Slope (%) = 2.51
Invert Elev Up (ft) = 809.00
Rise (in) = 24.0
Shape = Circular
Span (in) = 24.0
No. Barrels = 1
n-Value = 0.012
Culvert Type = Circular Concrete
Culvert Entrance = Square edge w/headwall (C)
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5
Embankment
Top Elevation (ft) = 815.00
Top Width (ft) = 50.00
Crest Width (ft) = 0.00
Calculations
Qmin (cfs) = 12.57
Qmax (cfs) = 12.57
Tailwater Elev (ft) = (dc+D)/2
Highlighted
Qtotal (cfs) = 12.57
Qpipe (cfs) = 12.57
Qovertop (cfs) = 0.00
Veloc Dn (ft/s) = 4.57
Veloc Up (ft/s) = 5.95
HGL Dn (ft) = 807.79
HGL Up (ft) = 810.27
Hw Elev (ft) = 810.96
Hw/D (ft) = 0.98
Flow Regime = Inlet Control
Pipe Identifier:10
Pipe Size (in):24
Outlet Flow (cfs):21
Is flow < Qmin?YES
d50 (ft):0.25
Thickness (in):7
La (ft):8
W (ft):10
3Do (ft):6
RIP-RAP SIZING FOR PIPE FLOWS BELOW Q MIN
W
La
3Do
Flow
Pipe Identifier 15
Pipe Size (in):36
Outlet Flow (cfs):29.1
Is flow < Qmin?YES
d50 (ft):0.6
Thickness (in):16
La (ft):20
W (ft):23
3Do (ft):9
RIP-RAP SIZING FOR PIPE FLOWS BELOW Q MIN
W
La
3Do
Flow
Pipe Identifier:20
Pipe Size (in):24
Outlet Flow (cfs):19.56
Is flow < Qmin?YES
d50 (ft):0.25
Thickness (in):7
La (ft):8
W (ft):10
3Do (ft):6
RIP-RAP SIZING FOR PIPE FLOWS BELOW Q MIN
W
La
3Do
Flow
Pipe Identifier:27
Pipe Size (in):24
Outlet Flow (cfs):3.98
Is flow < Qmin?YES
d50 (ft):0.25
Thickness (in):7
La (ft):8
W (ft):10
3Do (ft):6
RIP-RAP SIZING FOR PIPE FLOWS BELOW Q MIN
W
La
3Do
Flow
Pipe Identifier:30
Pipe Size (in):24
Outlet Flow (cfs):12.23
Is flow < Qmin?YES
d50 (ft):0.25
Thickness (in):7
La (ft):8
W (ft):10
3Do (ft):6
RIP-RAP SIZING FOR PIPE FLOWS BELOW Q MIN
W
La
3Do
Flow
Pipe Identifier 15
Pipe Size (in):36
Outlet Flow (cfs):29.1
Is flow < Qmin?YES
d50 (ft):0.6
Thickness (in):16
La (ft):20
W (ft):23
3Do (ft):9
RIP-RAP SIZING FOR PIPE FLOWS BELOW Q MIN
W
La
3Do
Flow
Pipe Identifier:C9
Pipe Size (in):24
Outlet Flow (cfs):12.57
Is flow < Qmin?YES
d50 (ft):0.25
Thickness (in):7
La (ft):8
W (ft):10
3Do (ft):6
RIP-RAP SIZING FOR PIPE FLOWS BELOW Q MIN
W
La
3Do
Flow
Okay
5.97 Disturbed Area (Acres)
25.83 Peak Flow from 10-year Storm (cfs)
10746 Required Volume ft3
8395 Required Surface Area ft2
64.8 Suggested Width ft
129.6 Suggested Length ft
65 Trial Top Width at Spillway Invert ft
130 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio Z:1
3 Trial Depth ft (2 to 3.5 feet above grade)
47 Bottom Width ft
112 Bottom Length ft
5264 Bottom Area ft2
20409 Actual Volume ft3 Okay
8450 Actual Surface Area ft2 Okay
25 Trial Weir Length ft
0.5 Trial Depth of Flow ft
26.5 Spillway Capacity cfs Okay
2.5 Skimmer Size (inches) Skimmer Size
0.208 Head on Skimmer (feet) (Inches)
1.75 Orifice Size (1/4 inch increments) 1.5
3.33 Dewatering Time (days) 2
Suggest about 3 days 2.5
3
4
5
6
8
Skimmer Basin 1 -Phase 2
Okay
2.3 Disturbed Area (Acres)
16.63 Peak Flow from 10-year Storm (cfs)
4140 Required Volume ft3
5405 Required Surface Area ft2
52.0 Suggested Width ft
104.0 Suggested Length ft
52 Trial Top Width at Spillway Invert ft
104 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio Z:1
2 Trial Depth ft (2 to 3.5 feet above grade)
40 Bottom Width ft
92 Bottom Length ft
3680 Bottom Area ft2
9040 Actual Volume ft3 Okay
5408 Actual Surface Area ft2 Okay
20 Trial Weir Length ft
0.5 Trial Depth of Flow ft
21.2 Spillway Capacity cfs Okay
2 Skimmer Size (inches) Skimmer Size
0.167 Head on Skimmer (feet) (Inches)
1.25 Orifice Size (1/4 inch increments) 1.5
2.81 Dewatering Time (days) 2
Suggest about 3 days 2.5
3
4
5
6
8
Skimmer Basin 2
Okay
4.26 Disturbed Area (Acres)
22.74 Peak Flow from 10-year Storm (cfs)
7668 Required Volume ft3
7391 Required Surface Area ft2
60.8 Suggested Width ft
121.6 Suggested Length ft
63 Trial Top Width at Spillway Invert ft
120 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio Z:1
3 Trial Depth ft (2 to 3.5 feet above grade)
45 Bottom Width ft
102 Bottom Length ft
4590 Bottom Area ft2
18063 Actual Volume ft3 Okay
7560 Actual Surface Area ft2 Okay
25 Trial Weir Length ft
0.5 Trial Depth of Flow ft
26.5 Spillway Capacity cfs Okay
2 Skimmer Size (inches) Skimmer Size
0.167 Head on Skimmer (feet) (Inches)
1.5 Orifice Size (1/4 inch increments) 1.5
3.61 Dewatering Time (days) 2
Suggest about 3 days 2.5
3
4
5
6
8
Skimmer Basin 3
Okay
5.68 Disturbed Area (Acres)
15.5 Peak Flow from 10-year Storm (cfs)
10224 Required Volume ft3
5038 Required Surface Area ft2
50.2 Suggested Width ft
100.4 Suggested Length ft
56 Trial Top Width at Spillway Invert ft
106 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio Z:1
3 Trial Depth ft (2 to 3.5 feet above grade)
38 Bottom Width ft
88 Bottom Length ft
3344 Bottom Area ft2
13758 Actual Volume ft3 Okay
5936 Actual Surface Area ft2 Okay
15 Trial Weir Length ft
0.5 Trial Depth of Flow ft
15.9 Spillway Capacity cfs Okay
2 Skimmer Size (inches) Skimmer Size
0.167 Head on Skimmer (feet) (Inches)
2 Orifice Size (1/4 inch increments) 1.5
2.71 Dewatering Time (days) 2
Suggest about 3 days 2.5
3
4
5
6
8
Skimmer Basin 4 - Phase 2
Okay
2.36 Disturbed Area (Acres)
7.94 Peak Flow from 10-year Storm (cfs)
4248 Required Volume ft3
2581 Required Surface Area ft2
35.9 Suggested Width ft
71.8 Suggested Length ft
45 Trial Top Width at Spillway Invert ft
90 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio Z:1
2 Trial Depth ft (2 to 3.5 feet above grade)
33 Bottom Width ft
78 Bottom Length ft
2574 Bottom Area ft2
6576 Actual Volume ft3 Okay
4050 Actual Surface Area ft2 Okay
15 Trial Weir Length ft
0.5 Trial Depth of Flow ft
15.9 Spillway Capacity cfs Okay
1.5 Skimmer Size (inches) Skimmer Size
0.125 Head on Skimmer (feet) (Inches)
1.25 Orifice Size (1/4 inch increments) 1.5
3.33 Dewatering Time (days) 2
Suggest about 3 days 2.5
3
4
5
6
8
Skimmer Basin 5
Okay
3.16 Disturbed Area (Acres)
8.63 Peak Flow from 10-year Storm (cfs)
5688 Required Volume ft3
2805 Required Surface Area ft2
37.4 Suggested Width ft
74.9 Suggested Length ft
45 Trial Top Width at Spillway Invert ft
90 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio Z:1
2 Trial Depth ft (2 to 3.5 feet above grade)
33 Bottom Width ft
78 Bottom Length ft
2574 Bottom Area ft2
6576 Actual Volume ft3 Okay
4050 Actual Surface Area ft2 Okay
10 Trial Weir Length ft
0.5 Trial Depth of Flow ft
10.6 Spillway Capacity cfs Okay
1.5 Skimmer Size (inches) Skimmer Size
0.125 Head on Skimmer (feet) (Inches)
1.5 Orifice Size (1/4 inch increments) 1.5
3.10 Dewatering Time (days) 2
Suggest about 3 days 2.5
3
4
5
6
8
Skimmer Basin 6
Okay
1.72 Disturbed Area (Acres)
4.7 Peak Flow from 10-year Storm (cfs)
3096 Required Volume ft3
1528 Required Surface Area ft2
27.6 Suggested Width ft
55.3 Suggested Length ft
30 Trial Top Width at Spillway Invert ft
60 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio Z:1
3 Trial Depth ft (2 to 3.5 feet above grade)
12 Bottom Width ft
42 Bottom Length ft
504 Bottom Area ft2
3294 Actual Volume ft3 Okay
1800 Actual Surface Area ft2 Okay
10 Trial Weir Length ft
0.5 Trial Depth of Flow ft
10.6 Spillway Capacity cfs Okay
1.5 Skimmer Size (inches) Skimmer Size
0.125 Head on Skimmer (feet) (Inches)
1.25 Orifice Size (1/4 inch increments) 1.5
2.43 Dewatering Time (days) 2
Suggest about 3 days 2.5
3
4
5
6
8
Skimmer Basin 7