Industrial Distribution Center - DRAINAGE REPORT - CMCSCS-DC18

STORM WATER MANAGEMENT REPORT FOR:

BROOKS DISTRIBUTION CENTER
ALAMANCE COUNTY, NC

2267 US-70
MEBANE, NORTH CAROLINA 27302

April 25, 2018

LE&D PROFESSIONALS, PC
River Run Executive Offices
Suite B
110 Exchange Street
Danville, VA 24541
Office: [phone]
Fax: [phone]

LE&D Project No. CMCSCS-DC18

Table of Contents

Discussion……………………………………...……….……………………………………………..3

Calculations:

Pre- & Post Hydrology..…………………………………......………………………….……..4

Runoff Summary……….……………………………………………………………….……..5

Underground Detention System……………………………………………….…………….6-8

Storm Pipe System………………………………………………………………………….9-10

Appendix

Quad Map A
Drainage Area Maps B
Rainfall Data C
SWM Calculations (HydroCAD) D
Soil Map and Report E
NC DEQ Storm-EZ Form F

BROOKS DISTRIBUTION CENTER 4/25/2018
NEW DISTRIBUTION BUILDING
ALAMANCE COUNTY, NC

PURPOSE: Analyze the storm water runoff for the proposed distribution center. The project
consists of grading, utility installation, building construction, paving, and re-
stabilization of all disturbed areas.

SITE DATA: The 25.44 acre site (10.97 acre disturbed) is located on the south side of US -70. The
site has flat to moderate slopes and drains generally to the south to the existing culvert
under the railroad. The railroad culvert eventually drains to Lower Back Creek, which
drains to the Haw River. The pre-developed site consists of grassed and forested areas.
Properties adjacent to the site are existing industrial buildings to the east, residential
lots to the north, and undeveloped, wooded area to the west.

PROCEDURE: Stormwater runoff was determined for pre- and post-development conditions for the
site by the Curve Number Method (TR-55.) Channel protection will be met per
North Carolina Erosion and Sediment Control Planning and Design Manual. The NC
DEQ Storm-EZ Form was used to determine required water quality treatment
volume for the developed conditions runoff. A Contech Stormfilter Vault will be
installed at the downstream side of the site and will provide storm water quality
treatment for the proposed development.
A series of 96” CMP pipes will utilized for stormwater volume using the rational
method with inlet/outlet control hydraulics for pre-development flows.

PROPOSED DEVELOPMENT & FINAL SITE CONDITIONS: The proposed development will
consist of the construction of a 250,000 square foot new building, utilities, and
graveled access. Stormwater management will include installation of a Contech
Stormfilter vault to treat the stormwater runoff. The stormwater management
facilities will be maintained according to a proposed long-term maintenance
agreement which includes operation, maintenance & inspection procedures.

Designer:Date: 4/18/2018
Project Title:
SITE AREA: 10.97 acres
Forest 0 Forest 1.30 Forest 0.24 Forest 1.69 Forest 0 Forest 0
Grass 2.82 Grass 3.70 Grass 0 Grass 0.43 Grass 0.87 Grass 0.96
Impervious 0 Impervious 0.00 Impervious 0.00 Impervious 0 Impervious 0.00 Impervious 0.00
Total 2.82 Total 5.00 Total 0.24 Total 2.12 Total 0.87 Total 0.96
Post‐Developed
Pervious 1.53 Pervious 1.99 Pervious 0.00 Pervious 0.74 Pervious 0.67 Pervious 0.94
Impervious 0 Impervious 6.09 Impervious 0.00 Impervious 0 Impervious 0.00 Impervious 0.00
Total 1.53 Total 8.08 Total 0.00 Total 0.74 Total 0.67 Total 0.94
Refer to Appendix "D" for Tc, Runoff Curve Numbers, Hydrographs, and Peak Flows.
Brooks Distribution Center
Basin 1 Basin 2
Drainage Area [acres] Drainage Area [acres]
Pre‐Developed
Drainage Area [acres]
Basin 1 Basin 2
Drainage Area [acres]
Basin 3
Drainage Area [acres]
Basin 3
Drainage Area [acres]
Basin 4 Basin 5
LE&D Professionals, PC
Ryan Gatewood, PE
HYDROLOGY CALCULATIONS
Project Number: CMCSCS‐DC18
Drainage Area [acres] Drainage Area [acres] Drainage Area [acres]
Basin 6
Drainage Area [acres] Drainage Area [acres] Drainage Area [acres]
Basin 4 Basin 5 Basin 6
Designer:Date: 4/18/2018
Project Title:
Storm
1 YR 0.40 cfs 0.60 cfs 0.02 cfs 0.10 cfs 0.28 cfs 0.36 cfs
2 YR 0.94 cfs 1.62 cfs 0.08 cfs 0.34 cfs 0.65 cfs 0.79 cfs
10 YR 2.89 cfs 5.57 cfs 0.38 cfs 1.45 cfs 1.85 cfs 2.18 cfs
Post‐Developed
Storm
1 YR 0.34 cfs 0.45 cfs 0.00 cfs 0.19 cfs 0.25 cfs 0.35 cfs
2 YR 0.80 cfs 0.54 cfs 0.00 cfs 0.45 cfs 0.55 cfs 0.77 cfs
10 YR 2.37 cfs 5.50 cfs 0.00 cfs 1.31 cfs 1.53 cfs 2.14 cfs
100 YR 5.45 cfs 23.54 cfs 0.00 cfs 2.97 cfs 3.39 cfs 4.73 cfs
Refer to Appendix "D" for peak flow rates, elevations, and ponding stage/storage/discharge.
Basin 3
Flowrate
Brooks Distribution Center
LE&D Professionals, PC
Ryan Gatewood, PE
RUNOFF SUMMARY CALCULATIONS
Project Number: CMCSCS‐DC18
Pre‐Developed
Flowrate
Basin 1 Basin 2
Flowrate
Basin 4 Basin 5
Basin 1 Basin 2
Flowrate
Basin 3
Flowrate Flowrate with Detention Flowrate Flowrate Flowrate
Basin 6
Flowrate Flowrate Flowrate
Basin 4 Basin 5 Basin 6
BROOKS DISTRIBUTION CENTERDATE: 4/18/18STORM DRAINAGE PIPE DESIGN WORKSHEET0.01310 YEAR STORM7.08 IN/HRFROM TOTOTALINLET PIPE PIPE-TIMEPIPE LENGTH UPPER LOWERPOINT POINT PERVIOUSD.A.TIME TIME OF CONC.SLOPE OF PIPE INVERT INVERTAC. AC.AC.(MIN) (MIN) (MIN) (CFS) (CFS)(CFS)(FT/FT) (IN) (IN) (FT/SEC) (FT) (MIN) (FT) (FT)YI-1 MH-2 0.45 0.000.455.0 0.0 5.0 0.98 0.135 0.000 0.135 0.96 0.000.960.0227 6.3 18 4.45 22.00 0.1 606.50 606.00MH-2 YI-3 0.00 0.450.455.0 0.0 5.0 0.98 0.000 0.441 0.441 0.00 3.123.120.0455 8.6 24 7.76 278.00 0.6 605.90 593.25YI-3 YI-4 0.55 0.451.005.0 0.0 5.0 0.98 0.165 0.441 0.606 1.17 3.124.290.0170 11.6 24 5.80 171.00 0.5 593.15 590.25RL 8" YI-4 0.00 0.002.505.0 0.0 5.0 0.98 2.250 0.000 2.250 15.93 0.0015.930.0100 21.0 24 6.61 20.00 0.1 592.00 591.80YI-4 YI-5 0.20 3.503.705.0 0.0 5.0 0.98 0.060 3.430 3.490 0.42 24.2824.710.0100 24.8 30 7.38 102.00 0.2 587.12 586.10YI-5 YI-6 0.20 3.703.905.0 0.0 5.0 0.98 0.060 3.626 3.686 0.42 25.6726.100.0050 28.8 30 5.78 449.00 1.3 586.00 583.74YI-6 MH-7 0.15 3.904.215.0 0.0 5.0 0.98 0.189 3.822 4.011 1.34 27.0628.400.0126 25.0 30 8.32 86.00 0.2 583.64 582.56RL 8" MH-7 0.00 0.002.505.0 0.0 5.0 0.98 2.250 0.000 2.250 15.93 0.0015.930.0095 21.2 24 6.48 471.00 1.2 592.00 587.53MH-7 96" CMP 0.00 6.716.715.0 0.0 5.0 0.98 0.000 6.576 6.576 0.00 46.5646.560.0083 32.5 36 8.07 12.00 0.0 582.56 582.4696" CMP OCS-8 0.00 6.710.005.0 0.0 5.0 0.98 0.000 6.576 6.576 0.00 46.5612.290.0214 16.5 36 8.24 7.00 0.0 582.46 582.31OCS-8STORMFILTER0.000.005.0 0.0 5.0 0.98 0.000 0.000 0.000 0.00 0.004.830.0050 15.3 18 3.78 6.00 0.0 582.21 582.18OCS-8 MH-9 0.000.005.0 0.0 5.0 0.98 0.000 0.000 0.000 0.00 0.0023.540.0050 27.7 36 5.62 12.00 0.0 583.55 583.49MH-9 MH-10 0.00 0.000.005.0 0.0 5.0 0.98 0.000 0.000 0.000 0.00 0.0023.540.0100 24.3 36 7.29 36.00 0.1 581.99 581.63MH-10 MH-11 0.00 0.000.005.0 0.0 5.0 0.98 0.000 0.000 0.000 0.00 0.0023.540.0100 24.3 36 7.29 12.00 0.0 579.87 579.75STORMFILTERMH-11 0.00 0.000.005.0 0.0 5.0 0.98 0.000 0.000 0.000 0.00 0.004.830.0060 14.8 18 4.05 5.00 0.0 579.78 579.75MH-11 EW-12 0.00 0.000.005.0 0.0 5.0 0.98 0.000 0.000 0.000 0.00 0.0028.370.0050 29.7 36 5.89 30.00 0.1 579.65 579.50000.00FROM HYDROCAD000.000.000.162.500.00AC0.000.000.002.50INLET FLOWTOTAL CxAPIPE CxAINLET CxAPIPE/RD RUNOFF COEF.FROM HYDROCADC = 0.45 LANDSCAPEDC = 0.90 IMPERVIOUSINLET D.A.PIPE OR ROOF DRAIN D.A.IMPV PART FULL PIPESEG- MENT TIMEPIPE FLOWMANNINGS n =RAINFALL INTENSITY=TOTAL FLOWACTUAL PIPE DIA.THEO. PIPE DIA.
PREPARED BY: LE and D PROFESSIONALS, PCProject: Project No.CMCSCS-DC18Date:4/19/18Design Storm:10 YearsHydraulic Grade Line CalculationsManning n= 0.013JUNCTION LOSSLine #.Outlet Water Elev. Do Qo Lo Sfo (ft/ft) Hf Vo Ho Qi Vi Qi Vi Vi^2/2g Hi H Hl 0.5 Hl Final HInlet Water Surface Elev.Rim Elev.EW‐12 ‐ MH‐11 579.50 36.00 28.37 30.00 0.0050 0.15 5.89 0.13 28.37 5.89 167.10 0.54 0.19 0.38 0.700.35 0.50 580.00 591.00MH‐11 ‐ STORMFILTER580.00 18.00 4.83 5.00 0.0060 0.03 4.05 0.06 4.83 4.05 19.56 0.25 0.09 0.18 0.330.17 0.20 580.20 591.50MH‐11 ‐ MH‐10 580.00 36.00 23.54 12.00 0.0100 0.12 7.29 0.21 23.54 7.29 171.61 0.83 0.29 0.58 1.070.54 0.66 580.66 589.25MH‐10 ‐ MH‐9 580.66 36.00 23.54 36.00 0.0100 0.36 7.29 0.21 23.54 7.29 171.61 0.83 0.29 0.58 1.070.54 0.90 581.55 591.50MH‐9 ‐ OCS‐8 581.55 36.00 23.54 12.00 0.0050 0.06 5.62 0.12 23.54 5.62 132.29 0.49 0.17 0.34 0.640.32 0.38 581.93 591.50STORMFILTER ‐ OCS‐8580.20 18.00 4.83 6.00 0.0050 0.03 3.78 0.06 4.83 3.78 18.26 0.22 0.08 0.16 0.290.14 0.17 580.37 591.50OCS‐8 ‐ 96" CMP 580.37 36.00 12.29 7.00 0.0214 0.15 8.24 0.26 12.29 8.24 101.27 1.05 0.37 0.74 1.370.69 0.84 581.21 592.0096" CMP ‐ MH‐7 581.21 36.00 46.56 12.00 0.0083 0.10 8.07 0.25 46.56 8.07 375.74 1.01 0.35 0.71 1.310.66 0.76 581.96 594.50MH‐7 ‐ RL 8" 581.96 24.00 15.93 471.00 0.0095 4.47 6.48 0.16 15.93 6.48 103.23 0.65 0.23 0.46 0.850.42 4.90 586.86 595.00MH‐7 ‐ YI‐6 581.96 30.00 28.40 86.00 0.0126 1.08 8.32 0.27 28.40 8.32 236.29 1.07 0.38 0.75 1.400.70 1.78 583.74 589.25YI‐6 ‐ YI‐5 583.74 30.00 26.10 449.00 0.0050 2.25 5.78 0.13 26.10 5.78 150.86 0.52 0.18 0.36 0.670.34 2.58 586.33 590.10YI‐5 ‐ YI‐4 586.33 30.00 24.71 102.00 0.0100 1.02 7.38 0.21 24.71 7.38 182.36 0.85 0.30 0.59 1.100.55 1.57 587.90 594.25YI‐4 ‐ RL 8" 587.90 24.00 15.93 20.00 0.0100 0.20 6.61 0.17 15.93 6.61 105.30 0.68 0.24 0.47 0.880.44 0.64 588.54 595.00YI‐4 ‐ YI‐3 587.90 24.00 4.29 171.00 0.0179 3.06 5.80 0.13 4.29 5.80 24.88 0.52 0.18 0.37 0.680.34 3.40 591.30 597.25YI‐3 ‐ MH‐2 591.30 24.00 3.12 278.00 0.0455 12.65 7.76 0.23 3.12 7.76 24.21 0.94 0.33 0.65 1.220.61 13.26 604.55 610.00MH‐2 ‐ YI‐1 604.55 18.00 0.96 22.00 0.0227 0.50 4.45 0.08 0.96 4.45 4.27 0.31 0.11 0.22 0.400.20 0.70 605.25 610.50Brooks Distribution CenterPOST‐DEVELOPED Q10CMCSCS‐DC18 HGL.xlsx

Appendix A

Quad Map
AlamanceCounty
Printed April 16, 2018
See Below for Disclaimer
Welcome to the Alamance County GIS Site. THIS IS NOT A LEGAL DOCUMENT. Alamance County shall assume no liability for any errors, omissions, or inaccuracies in the
information provided regardless of how caused; or any decisions made or actions taken or not taken by user in reliance upon any information or data furnished
hereunder. The user knowingly waives any and all claims for damages against any and all of the entities comprising the ALAMANCE COUNTY GIS SYSTEM that may arise
from the mapping data. The well & septic layer is a representation of well and septic data collected or plotted by the Alamance County Health Department. It is accurate
within the limits of their equipment and training. GPS data collection began in 2013, it is not a complete representation of all parcels within the county that have wells
and septic systems. This dataset is updated periodically as new data becomes available. **IMPORTANT NOTE: This web map is intended to provide general information
as to the individual school attendance zones. The completeness or accuracy of the mapping is not guaranteed nor should the user assume the results as a guarantee of
student placement at any school. Addresses that are on or near an attendance line should be confirmed by the Alamance-Burlington School District Transportation
Department 336-570-6541.**

Appendix B

Drainage Area Maps

Appendix C

Rainfall Data
NOAA Atlas 14, Volume 2, Version 3
Location name: Mebane, North Carolina, USA*
Latitude: 36.0947°, Longitude: -79.3151°
Elevation: 593.17 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)1
Duration Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min 0.392
(0.357‑0.429)
0.465
(0.426‑0.510)
0.541
(0.493‑0.592)
0.590
(0.538‑0.645)
0.643
(0.583‑0.702)
0.676
(0.611‑0.738)
0.704
(0.634‑0.769)
0.725
(0.650‑0.794)
0.745
(0.662‑0.816)
0.757
(0.667‑0.828)
10-min 0.626
(0.571‑0.685)
0.744
(0.681‑0.816)
0.866
(0.790‑0.948)
0.944
(0.861‑1.03)
1.02
(0.930‑1.12)
1.08
(0.973‑1.18)
1.12
(1.01‑1.22)
1.15
(1.03‑1.26)
1.18
(1.05‑1.29)
1.19
(1.05‑1.31)
15-min 0.782
(0.714‑0.856)
0.935
(0.856‑1.02)
1.10
(1.00‑1.20)
1.19
(1.09‑1.31)
1.30
(1.18‑1.42)
1.36
(1.23‑1.49)
1.41
(1.27‑1.55)
1.45
(1.30‑1.59)
1.48
(1.32‑1.62)
1.50
(1.32‑1.64)
30-min 1.07
(0.978‑1.17)
1.29
(1.18‑1.42)
1.56
(1.42‑1.70)
1.73
(1.58‑1.89)
1.93
(1.75‑2.10)
2.05
(1.86‑2.24)
2.17
(1.95‑2.37)
2.26
(2.02‑2.47)
2.36
(2.10‑2.58)
2.42
(2.13‑2.65)
60-min 1.34
(1.22‑1.46)
1.62
(1.48‑1.78)
2.00
(1.82‑2.18)
2.25
(2.05‑2.46)
2.56
(2.32‑2.80)
2.78
(2.51‑3.04)
2.98
(2.69‑3.26)
3.17
(2.84‑3.47)
3.39
(3.01‑3.71)
3.54
(3.12‑3.87)
2-hr 1.58
(1.45‑1.72)
1.91
(1.76‑2.09)
2.38
(2.17‑2.59)
2.71
(2.47‑2.95)
3.12
(2.83‑3.40)
3.43
(3.10‑3.73)
3.73
(3.34‑4.05)
4.01
(3.57‑4.35)
4.37
(3.85‑4.74)
4.62
(4.03‑5.03)
3-hr 1.69
(1.56‑1.84)
2.05
(1.89‑2.23)
2.54
(2.34‑2.77)
2.91
(2.67‑3.15)
3.37
(3.07‑3.64)
3.70
(3.36‑4.00)
4.03
(3.63‑4.36)
4.36
(3.89‑4.70)
4.76
(4.20‑5.14)
5.06
(4.42‑5.47)
6-hr 2.05
(1.90‑2.23)
2.48
(2.30‑2.70)
3.08
(2.84‑3.34)
3.53
(3.24‑3.82)
4.12
(3.76‑4.46)
4.58
(4.15‑4.95)
5.04
(4.54‑5.44)
5.50
(4.89‑5.93)
6.11
(5.36‑6.59)
6.58
(5.69‑7.11)
12-hr 2.44
(2.26‑2.66)
2.95
(2.72‑3.22)
3.68
(3.38‑4.01)
4.25
(3.90‑4.62)
5.03
(4.58‑5.44)
5.65
(5.10‑6.10)
6.29
(5.62‑6.77)
6.95
(6.13‑7.46)
7.86
(6.81‑8.45)
8.58
(7.30‑9.22)
24-hr 2.86
(2.67‑3.08)
3.46
(3.23‑3.71)
4.31
(4.01‑4.62)
4.96
(4.62‑5.32)
5.85
(5.42‑6.29)
6.55
(6.06‑7.05)
7.26
(6.69‑7.83)
7.99
(7.33‑8.63)
8.98
(8.20‑9.73)
9.75
(8.86‑10.6)
2-day 3.35
(3.13‑3.59)
4.03
(3.77‑4.32)
4.97
(4.65‑5.33)
5.68
(5.31‑6.10)
6.64
(6.18‑7.13)
7.38
(6.84‑7.94)
8.13
(7.51‑8.76)
8.89
(8.17‑9.60)
9.90
(9.06‑10.7)
10.7
(9.74‑11.6)
3-day 3.53
(3.31‑3.79)
4.24
(3.97‑4.55)
5.22
(4.89‑5.60)
5.97
(5.58‑6.40)
6.98
(6.50‑7.49)
7.77
(7.20‑8.35)
8.56
(7.91‑9.22)
9.37
(8.62‑10.1)
10.5
(9.57‑11.3)
11.3
(10.3‑12.3)
4-day 3.72
(3.49‑3.99)
4.46
(4.18‑4.78)
5.48
(5.13‑5.86)
6.27
(5.85‑6.71)
7.33
(6.82‑7.85)
8.15
(7.56‑8.76)
9.00
(8.31‑9.69)
9.86
(9.07‑10.6)
11.0
(10.1‑11.9)
11.9
(10.9‑13.0)
7-day 4.27
(4.02‑4.56)
5.09
(4.79‑5.43)
6.16
(5.80‑6.58)
7.01
(6.58‑7.48)
8.15
(7.64‑8.71)
9.06
(8.46‑9.70)
9.98
(9.27‑10.7)
10.9
(10.1‑11.7)
12.2
(11.2‑13.1)
13.2
(12.0‑14.3)
10-day 4.84
(4.57‑5.15)
5.75
(5.42‑6.12)
6.89
(6.50‑7.35)
7.79
(7.33‑8.30)
9.00
(8.45‑9.60)
9.95
(9.31‑10.6)
10.9
(10.2‑11.7)
11.9
(11.0‑12.8)
13.2
(12.2‑14.2)
14.2
(13.1‑15.4)
20-day 6.46
(6.11‑6.84)
7.62
(7.20‑8.07)
8.99
(8.50‑9.53)
10.1
(9.53‑10.7)
11.6
(10.9‑12.3)
12.8
(12.0‑13.6)
14.0
(13.1‑14.9)
15.2
(14.1‑16.3)
16.9
(15.6‑18.2)
18.2
(16.7‑19.6)
30-day 8.01
(7.61‑8.46)
9.42
(8.93‑9.93)
10.9
(10.4‑11.5)
12.1
(11.5‑12.8)
13.7
(12.9‑14.4)
14.9
(14.0‑15.7)
16.0
(15.1‑17.0)
17.2
(16.1‑18.3)
18.8
(17.5‑20.0)
20.0
(18.6‑21.4)
45-day 10.2
(9.67‑10.7)
11.9
(11.3‑12.5)
13.6
(12.9‑14.3)
14.9
(14.2‑15.7)
16.7
(15.8‑17.6)
18.1
(17.1‑19.0)
19.4
(18.3‑20.5)
20.7
(19.5‑21.9)
22.5
(21.0‑23.9)
23.8
(22.2‑25.4)
60-day 12.2
(11.6‑12.8)
14.2
(13.6‑14.9)
16.0
(15.3‑16.8)
17.4
(16.6‑18.2)
19.2
(18.3‑20.1)
20.5
(19.5‑21.6)
21.8
(20.7‑22.9)
23.1
(21.8‑24.3)
24.7
(23.2‑26.1)
25.9
(24.3‑27.4)
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.
Back to Top
PF graphical
NOAA Atlas 14, Volume 2, Version 3
Location name: Mebane, North Carolina, USA*
Latitude: 36.0947°, Longitude: -79.3151°
Elevation: 593.17 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 4.70
(4.28‑5.15)
5.58
(5.11‑6.12)
6.49
(5.92‑7.10)
7.08
(6.46‑7.74)
7.72
(7.00‑8.42)
8.11
(7.33‑8.86)
8.45
(7.61‑9.23)
8.70
(7.80‑9.53)
8.94
(7.94‑9.79)
9.08
(8.00‑9.94)
10-min 3.76
(3.43‑4.11)
4.46
(4.09‑4.90)
5.20
(4.74‑5.69)
5.66
(5.17‑6.19)
6.15
(5.58‑6.71)
6.46
(5.84‑7.05)
6.71
(6.05‑7.33)
6.90
(6.18‑7.55)
7.07
(6.28‑7.74)
7.16
(6.30‑7.83)
15-min 3.13
(2.86‑3.42)
3.74
(3.42‑4.10)
4.38
(4.00‑4.80)
4.78
(4.36‑5.22)
5.20
(4.71‑5.68)
5.45
(4.93‑5.95)
5.66
(5.10‑6.18)
5.80
(5.20‑6.35)
5.94
(5.27‑6.50)
5.99
(5.27‑6.55)
30-min 2.14
(1.96‑2.35)
2.58
(2.36‑2.83)
3.11
(2.84‑3.41)
3.46
(3.15‑3.78)
3.85
(3.49‑4.20)
4.10
(3.71‑4.48)
4.33
(3.90‑4.73)
4.52
(4.05‑4.94)
4.72
(4.19‑5.17)
4.85
(4.27‑5.30)
60-min 1.34
(1.22‑1.46)
1.62
(1.48‑1.78)
2.00
(1.82‑2.18)
2.25
(2.05‑2.46)
2.56
(2.32‑2.80)
2.78
(2.51‑3.04)
2.98
(2.69‑3.26)
3.17
(2.84‑3.47)
3.39
(3.01‑3.71)
3.54
(3.12‑3.87)
2-hr 0.790
(0.724‑0.862)
0.957
(0.878‑1.05)
1.19
(1.09‑1.30)
1.35
(1.23‑1.47)
1.56
(1.42‑1.70)
1.72
(1.55‑1.86)
1.86
(1.67‑2.03)
2.00
(1.78‑2.18)
2.18
(1.92‑2.37)
2.31
(2.02‑2.52)
3-hr 0.563
(0.518‑0.611)
0.682
(0.629‑0.742)
0.847
(0.779‑0.921)
0.968
(0.888‑1.05)
1.12
(1.02‑1.21)
1.23
(1.12‑1.33)
1.34
(1.21‑1.45)
1.45
(1.29‑1.57)
1.59
(1.40‑1.71)
1.68
(1.47‑1.82)
6-hr 0.343
(0.317‑0.373)
0.414
(0.383‑0.450)
0.514
(0.474‑0.558)
0.589
(0.542‑0.638)
0.689
(0.629‑0.744)
0.765
(0.693‑0.826)
0.842
(0.757‑0.908)
0.918
(0.817‑0.991)
1.02
(0.894‑1.10)
1.10
(0.950‑1.19)
12-hr 0.203
(0.187‑0.221)
0.245
(0.226‑0.267)
0.305
(0.281‑0.333)
0.353
(0.323‑0.384)
0.418
(0.380‑0.452)
0.469
(0.423‑0.506)
0.522
(0.466‑0.561)
0.577
(0.509‑0.619)
0.653
(0.565‑0.701)
0.712
(0.606‑0.765)
24-hr 0.119
(0.111‑0.128)
0.144
(0.135‑0.155)
0.179
(0.167‑0.193)
0.207
(0.192‑0.222)
0.244
(0.226‑0.262)
0.273
(0.252‑0.294)
0.303
(0.279‑0.326)
0.333
(0.306‑0.360)
0.374
(0.342‑0.405)
0.406
(0.369‑0.441)
2-day 0.070
(0.065‑0.075)
0.084
(0.078‑0.090)
0.103
(0.097‑0.111)
0.118
(0.111‑0.127)
0.138
(0.129‑0.148)
0.154
(0.143‑0.165)
0.169
(0.156‑0.182)
0.185
(0.170‑0.200)
0.206
(0.189‑0.224)
0.223
(0.203‑0.242)
3-day 0.049
(0.046‑0.053)
0.059
(0.055‑0.063)
0.073
(0.068‑0.078)
0.083
(0.077‑0.089)
0.097
(0.090‑0.104)
0.108
(0.100‑0.116)
0.119
(0.110‑0.128)
0.130
(0.120‑0.141)
0.145
(0.133‑0.158)
0.157
(0.143‑0.171)
4-day 0.039
(0.036‑0.042)
0.046
(0.044‑0.050)
0.057
(0.053‑0.061)
0.065
(0.061‑0.070)
0.076
(0.071‑0.082)
0.085
(0.079‑0.091)
0.094
(0.087‑0.101)
0.103
(0.094‑0.111)
0.115
(0.105‑0.124)
0.124
(0.113‑0.135)
7-day 0.025
(0.024‑0.027)
0.030
(0.029‑0.032)
0.037
(0.035‑0.039)
0.042
(0.039‑0.045)
0.049
(0.045‑0.052)
0.054
(0.050‑0.058)
0.059
(0.055‑0.064)
0.065
(0.060‑0.070)
0.072
(0.067‑0.078)
0.078
(0.072‑0.085)
10-day 0.020
(0.019‑0.021)
0.024
(0.023‑0.026)
0.029
(0.027‑0.031)
0.032
(0.031‑0.035)
0.038
(0.035‑0.040)
0.041
(0.039‑0.044)
0.045
(0.042‑0.049)
0.050
(0.046‑0.053)
0.055
(0.051‑0.059)
0.059
(0.054‑0.064)
20-day 0.013
(0.013‑0.014)
0.016
(0.015‑0.017)
0.019
(0.018‑0.020)
0.021
(0.020‑0.022)
0.024
(0.023‑0.026)
0.027
(0.025‑0.028)
0.029
(0.027‑0.031)
0.032
(0.029‑0.034)
0.035
(0.032‑0.038)
0.038
(0.035‑0.041)
30-day 0.011
(0.011‑0.012)
0.013
(0.012‑0.014)
0.015
(0.014‑0.016)
0.017
(0.016‑0.018)
0.019
(0.018‑0.020)
0.021
(0.019‑0.022)
0.022
(0.021‑0.024)
0.024
(0.022‑0.025)
0.026
(0.024‑0.028)
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)
0.015
(0.015‑0.016)
0.017
(0.016‑0.018)
0.018
(0.017‑0.019)
0.019
(0.018‑0.020)
0.021
(0.019‑0.022)
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)
0.013
(0.013‑0.014)
0.014
(0.014‑0.015)
0.015
(0.014‑0.016)
0.016
(0.015‑0.017)
0.017
(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.
Back to Top
PF graphical

Appendix D

HydroCAD Calculations
1S
PRE 1
Drainage Diagram for PRE 1
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
PRE 1
Page 2Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area (acres)CN Description (subcats)
2.820 61 >75% Grass cover, Good, HSG B (1S)

2.820
Type II 24-hr 1 YR Rainfall=2.86"PRE 1
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=2.820 ac Runoff Depth=0.31"Subcatchment 1S: PRE 1
Flow Length=1,577' Tc=30.3 min CN=61 Runoff=0.40 cfs 0.074 af
Total Runoff Area = 2.820 ac Runoff Volume = 0.074 af Average Runoff Depth = 0.31"
100.00% Pervious Area = 2.820 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"PRE 1
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 1
Runoff = 0.40 cfs @ 12.36 hrs, Volume= 0.074 af, Depth= 0.31"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
2.820 61 >75% Grass cover, Good, HSG B
2.820 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
19.7 300 0.0730 0.25 Sheet Flow, 300' - SHEET
Grass: Dense n= 0.240 P2= 3.46"
9.7 1,100 0.0730 1.89 Shallow Concentrated Flow, 115' - SHALLOW
Short Grass Pasture Kv= 7.0 fps
0.9 177 0.0500 3.35 Shallow Concentrated Flow, 177' - SHALLOW
Grassed Waterway Kv= 15.0 fps
30.3 1,577 Total
Subcatchment 1S: PRE 1
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.44
0.42
0.4
0.38
0.36
0.34
0.32
0.3
0.28
0.26
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=2.820 ac
Runoff Volume=0.074 af
Runoff Depth=0.31"
Flow Length=1,577'
Tc=30.3 min
CN=61
0.40 cfs
Type II 24-hr 2 YR Rainfall=3.46"PRE 1
Page 5Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=2.820 ac Runoff Depth=0.55"Subcatchment 1S: PRE 1
Flow Length=1,577' Tc=30.3 min CN=61 Runoff=0.94 cfs 0.130 af
Total Runoff Area = 2.820 ac Runoff Volume = 0.130 af Average Runoff Depth = 0.55"
100.00% Pervious Area = 2.820 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"PRE 1
Page 6Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 1
Runoff = 0.94 cfs @ 12.32 hrs, Volume= 0.130 af, Depth= 0.55"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
2.820 61 >75% Grass cover, Good, HSG B
2.820 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
19.7 300 0.0730 0.25 Sheet Flow, 300' - SHEET
Grass: Dense n= 0.240 P2= 3.46"
9.7 1,100 0.0730 1.89 Shallow Concentrated Flow, 115' - SHALLOW
Short Grass Pasture Kv= 7.0 fps
0.9 177 0.0500 3.35 Shallow Concentrated Flow, 177' - SHALLOW
Grassed Waterway Kv= 15.0 fps
30.3 1,577 Total
Subcatchment 1S: PRE 1
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)1
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=2.820 ac
Runoff Volume=0.130 af
Runoff Depth=0.55"
Flow Length=1,577'
Tc=30.3 min
CN=61
0.94 cfs
Type II 24-hr 10 YR Rainfall=4.96"PRE 1
Page 7Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=2.820 ac Runoff Depth=1.35"Subcatchment 1S: PRE 1
Flow Length=1,577' Tc=30.3 min CN=61 Runoff=2.90 cfs 0.316 af
Total Runoff Area = 2.820 ac Runoff Volume = 0.316 af Average Runoff Depth = 1.35"
100.00% Pervious Area = 2.820 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"PRE 1
Page 8Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 1
Runoff = 2.90 cfs @ 12.29 hrs, Volume= 0.316 af, Depth= 1.35"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
2.820 61 >75% Grass cover, Good, HSG B
2.820 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
19.7 300 0.0730 0.25 Sheet Flow, 300' - SHEET
Grass: Dense n= 0.240 P2= 3.46"
9.7 1,100 0.0730 1.89 Shallow Concentrated Flow, 115' - SHALLOW
Short Grass Pasture Kv= 7.0 fps
0.9 177 0.0500 3.35 Shallow Concentrated Flow, 177' - SHALLOW
Grassed Waterway Kv= 15.0 fps
30.3 1,577 Total
Subcatchment 1S: PRE 1
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)3
2
1
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=2.820 ac
Runoff Volume=0.316 af
Runoff Depth=1.35"
Flow Length=1,577'
Tc=30.3 min
CN=61
2.90 cfs
Type II 24-hr 100 YR Rainfall=7.26"PRE 1
Page 9Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=2.820 ac Runoff Depth=2.89"Subcatchment 1S: PRE 1
Flow Length=1,577' Tc=30.3 min CN=61 Runoff=6.80 cfs 0.679 af
Total Runoff Area = 2.820 ac Runoff Volume = 0.679 af Average Runoff Depth = 2.89"
100.00% Pervious Area = 2.820 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"PRE 1
Page 10Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 1
Runoff = 6.80 cfs @ 12.26 hrs, Volume= 0.679 af, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
2.820 61 >75% Grass cover, Good, HSG B
2.820 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
19.7 300 0.0730 0.25 Sheet Flow, 300' - SHEET
Grass: Dense n= 0.240 P2= 3.46"
9.7 1,100 0.0730 1.89 Shallow Concentrated Flow, 115' - SHALLOW
Short Grass Pasture Kv= 7.0 fps
0.9 177 0.0500 3.35 Shallow Concentrated Flow, 177' - SHALLOW
Grassed Waterway Kv= 15.0 fps
30.3 1,577 Total
Subcatchment 1S: PRE 1
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)7
6
5
4
3
2
1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=2.820 ac
Runoff Volume=0.679 af
Runoff Depth=2.89"
Flow Length=1,577'
Tc=30.3 min
CN=61
6.80 cfs
1S
POST 1
Drainage Diagram for POST 1
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
POST 1
Page 2Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area (acres)CN Description (subcats)
1.530 61 >75% Grass cover, Good, HSG B (1S)

1.530
Type II 24-hr 1 YR Rainfall=2.86"POST 1
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=1.530 ac Runoff Depth=0.31"Subcatchment 1S: POST 1
Flow Length=924' Slope=0.0730 '/' Tc=16.1 min CN=61 Runoff=0.34 cfs 0.040 af
Total Runoff Area = 1.530 ac Runoff Volume = 0.040 af Average Runoff Depth = 0.31"
100.00% Pervious Area = 1.530 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"POST 1
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 1
Runoff = 0.34 cfs @ 12.14 hrs, Volume= 0.040 af, Depth= 0.31"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
1.530 61 >75% Grass cover, Good, HSG B
1.530 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.5 300 0.0730 0.37 Sheet Flow, 300' SHEET
Grass: Short n= 0.150 P2= 3.46"
2.6 624 0.0730 4.05 Shallow Concentrated Flow, 369' SHALLOW
Grassed Waterway Kv= 15.0 fps
16.1 924 Total
Subcatchment 1S: POST 1
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.36
0.34
0.32
0.3
0.28
0.26
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=1.530 ac
Runoff Volume=0.040 af
Runoff Depth=0.31"
Flow Length=924'
Slope=0.0730 '/'
Tc=16.1 min
CN=61
0.34 cfs
Type II 24-hr 2 YR Rainfall=3.46"POST 1
Page 5Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=1.530 ac Runoff Depth=0.55"Subcatchment 1S: POST 1
Flow Length=924' Slope=0.0730 '/' Tc=16.1 min CN=61 Runoff=0.80 cfs 0.071 af
Total Runoff Area = 1.530 ac Runoff Volume = 0.071 af Average Runoff Depth = 0.55"
100.00% Pervious Area = 1.530 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"POST 1
Page 6Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 1
Runoff = 0.80 cfs @ 12.11 hrs, Volume= 0.071 af, Depth= 0.55"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
1.530 61 >75% Grass cover, Good, HSG B
1.530 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.5 300 0.0730 0.37 Sheet Flow, 300' SHEET
Grass: Short n= 0.150 P2= 3.46"
2.6 624 0.0730 4.05 Shallow Concentrated Flow, 369' SHALLOW
Grassed Waterway Kv= 15.0 fps
16.1 924 Total
Subcatchment 1S: POST 1
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=1.530 ac
Runoff Volume=0.071 af
Runoff Depth=0.55"
Flow Length=924'
Slope=0.0730 '/'
Tc=16.1 min
CN=61
0.80 cfs
Type II 24-hr 10 YR Rainfall=4.96"POST 1
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=1.530 ac Runoff Depth=1.35"Subcatchment 1S: POST 1
Flow Length=924' Slope=0.0730 '/' Tc=16.1 min CN=61 Runoff=2.37 cfs 0.172 af
Total Runoff Area = 1.530 ac Runoff Volume = 0.172 af Average Runoff Depth = 1.35"
100.00% Pervious Area = 1.530 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"POST 1
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Subcatchment 1S: POST 1
Runoff = 2.37 cfs @ 12.10 hrs, Volume= 0.172 af, Depth= 1.35"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
1.530 61 >75% Grass cover, Good, HSG B
1.530 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.5 300 0.0730 0.37 Sheet Flow, 300' SHEET
Grass: Short n= 0.150 P2= 3.46"
2.6 624 0.0730 4.05 Shallow Concentrated Flow, 369' SHALLOW
Grassed Waterway Kv= 15.0 fps
16.1 924 Total
Subcatchment 1S: POST 1
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=1.530 ac
Runoff Volume=0.172 af
Runoff Depth=1.35"
Flow Length=924'
Slope=0.0730 '/'
Tc=16.1 min
CN=61
2.37 cfs
Type II 24-hr 100 YR Rainfall=7.26"POST 1
Page 9Prepared by {enter your company name here}
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=1.530 ac Runoff Depth=2.89"Subcatchment 1S: POST 1
Flow Length=924' Slope=0.0730 '/' Tc=16.1 min CN=61 Runoff=5.45 cfs 0.369 af
Total Runoff Area = 1.530 ac Runoff Volume = 0.369 af Average Runoff Depth = 2.89"
100.00% Pervious Area = 1.530 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"POST 1
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Subcatchment 1S: POST 1
Runoff = 5.45 cfs @ 12.09 hrs, Volume= 0.369 af, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
1.530 61 >75% Grass cover, Good, HSG B
1.530 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.5 300 0.0730 0.37 Sheet Flow, 300' SHEET
Grass: Short n= 0.150 P2= 3.46"
2.6 624 0.0730 4.05 Shallow Concentrated Flow, 369' SHALLOW
Grassed Waterway Kv= 15.0 fps
16.1 924 Total
Subcatchment 1S: POST 1
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)6
5
4
3
2
1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=1.530 ac
Runoff Volume=0.369 af
Runoff Depth=2.89"
Flow Length=924'
Slope=0.0730 '/'
Tc=16.1 min
CN=61
5.45 cfs
1S
PRE 2
Drainage Diagram for PRE 2
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
PRE 2
Page 2Prepared by {enter your company name here}
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Area Listing (all nodes)
Area (acres)CN Description (subcats)
1.300 55 Woods, Good, HSG B (1S)
3.700 61 >75% Grass cover, Good, HSG B (1S)

5.000
Type II 24-hr 1 YR Rainfall=2.86"PRE 2
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=5.000 ac Runoff Depth=0.26"Subcatchment 1S: PRE 2
Flow Length=830' Slope=0.0730 '/' Tc=21.9 min CN=59 Runoff=0.60 cfs 0.107 af
Total Runoff Area = 5.000 ac Runoff Volume = 0.107 af Average Runoff Depth = 0.26"
100.00% Pervious Area = 5.000 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"PRE 2
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 2
Runoff = 0.60 cfs @ 12.24 hrs, Volume= 0.107 af, Depth= 0.26"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
3.700 61 >75% Grass cover, Good, HSG B
1.300 55 Woods, Good, HSG B
5.000 59 Weighted Average
5.000 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
19.7 300 0.0730 0.25 Sheet Flow, 300' - SHEET
Grass: Dense n= 0.240 P2= 3.46"
2.2 530 0.0730 4.05 Shallow Concentrated Flow, 530' - SHALLOW
Grassed Waterway Kv= 15.0 fps
21.9 830 Total
Subcatchment 1S: PRE 2
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=5.000 ac
Runoff Volume=0.107 af
Runoff Depth=0.26"
Flow Length=830'
Slope=0.0730 '/'
Tc=21.9 min
CN=59
0.60 cfs
Type II 24-hr 2 YR Rainfall=3.46"PRE 2
Page 5Prepared by {enter your company name here}
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=5.000 ac Runoff Depth=0.48"Subcatchment 1S: PRE 2
Flow Length=830' Slope=0.0730 '/' Tc=21.9 min CN=59 Runoff=1.62 cfs 0.198 af
Total Runoff Area = 5.000 ac Runoff Volume = 0.198 af Average Runoff Depth = 0.48"
100.00% Pervious Area = 5.000 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"PRE 2
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Subcatchment 1S: PRE 2
Runoff = 1.62 cfs @ 12.20 hrs, Volume= 0.198 af, Depth= 0.48"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
3.700 61 >75% Grass cover, Good, HSG B
1.300 55 Woods, Good, HSG B
5.000 59 Weighted Average
5.000 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
19.7 300 0.0730 0.25 Sheet Flow, 300' - SHEET
Grass: Dense n= 0.240 P2= 3.46"
2.2 530 0.0730 4.05 Shallow Concentrated Flow, 530' - SHALLOW
Grassed Waterway Kv= 15.0 fps
21.9 830 Total
Subcatchment 1S: PRE 2
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)1
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=5.000 ac
Runoff Volume=0.198 af
Runoff Depth=0.48"
Flow Length=830'
Slope=0.0730 '/'
Tc=21.9 min
CN=59
1.62 cfs
Type II 24-hr 10 YR Rainfall=4.96"PRE 2
Page 7Prepared by {enter your company name here}
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=5.000 ac Runoff Depth=1.21"Subcatchment 1S: PRE 2
Flow Length=830' Slope=0.0730 '/' Tc=21.9 min CN=59 Runoff=5.59 cfs 0.505 af
Total Runoff Area = 5.000 ac Runoff Volume = 0.505 af Average Runoff Depth = 1.21"
100.00% Pervious Area = 5.000 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"PRE 2
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Subcatchment 1S: PRE 2
Runoff = 5.59 cfs @ 12.17 hrs, Volume= 0.505 af, Depth= 1.21"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
3.700 61 >75% Grass cover, Good, HSG B
1.300 55 Woods, Good, HSG B
5.000 59 Weighted Average
5.000 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
19.7 300 0.0730 0.25 Sheet Flow, 300' - SHEET
Grass: Dense n= 0.240 P2= 3.46"
2.2 530 0.0730 4.05 Shallow Concentrated Flow, 530' - SHALLOW
Grassed Waterway Kv= 15.0 fps
21.9 830 Total
Subcatchment 1S: PRE 2
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)6
5
4
3
2
1
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=5.000 ac
Runoff Volume=0.505 af
Runoff Depth=1.21"
Flow Length=830'
Slope=0.0730 '/'
Tc=21.9 min
CN=59
5.59 cfs
Type II 24-hr 100 YR Rainfall=7.26"PRE 2
Page 9Prepared by {enter your company name here}
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=5.000 ac Runoff Depth=2.69"Subcatchment 1S: PRE 2
Flow Length=830' Slope=0.0730 '/' Tc=21.9 min CN=59 Runoff=13.70 cfs 1.120 af
Total Runoff Area = 5.000 ac Runoff Volume = 1.120 af Average Runoff Depth = 2.69"
100.00% Pervious Area = 5.000 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"PRE 2
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Subcatchment 1S: PRE 2
Runoff = 13.70 cfs @ 12.16 hrs, Volume= 1.120 af, Depth= 2.69"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
3.700 61 >75% Grass cover, Good, HSG B
1.300 55 Woods, Good, HSG B
5.000 59 Weighted Average
5.000 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
19.7 300 0.0730 0.25 Sheet Flow, 300' - SHEET
Grass: Dense n= 0.240 P2= 3.46"
2.2 530 0.0730 4.05 Shallow Concentrated Flow, 530' - SHALLOW
Grassed Waterway Kv= 15.0 fps
21.9 830 Total
Subcatchment 1S: PRE 2
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=5.000 ac
Runoff Volume=1.120 af
Runoff Depth=2.69"
Flow Length=830'
Slope=0.0730 '/'
Tc=21.9 min
CN=59
13.70 cfs
1S
POST 2
2P
Underground Detention
Drainage Diagram for POST 2 WITH UNDERGROUND STORAGE_REV-1
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
POST 2 WITH UNDERGROUND STORAGE_REV-1
Page 2Prepared by {enter your company name here}
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Area Listing (all nodes)
Area (acres)CN Description (subcats)
1.990 61 >75% Grass cover, Good, HSG B (1S)
6.090 98 Paved parking & roofs (1S)

8.080
Type II 24-hr 1 YR Rainfall=2.86"POST 2 WITH UNDERGROUND STORAGE_REV-1
Page 3Prepared by {enter your company name here}
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=8.080 ac Runoff Depth=1.77"Subcatchment 1S: POST 2
Flow Length=1,570' Tc=10.2 min CN=89 Runoff=21.67 cfs 1.194 af
Peak Elev=584.85' Storage=0.173 af Inflow=21.67 cfs 1.194 afPond 2P: Underground Detention
Discarded=11.69 cfs 1.179 af Primary=0.45 cfs 0.015 af Outflow=12.14 cfs 1.194 af
Total Runoff Area = 8.080 ac Runoff Volume = 1.194 af Average Runoff Depth = 1.77"
24.63% Pervious Area = 1.990 ac 75.37% Impervious Area = 6.090 ac
Type II 24-hr 1 YR Rainfall=2.86"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff = 21.67 cfs @ 12.02 hrs, Volume= 1.194 af, Depth= 1.77"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
1.990 61 >75% Grass cover, Good, HSG B
6.090 98 Paved parking & roofs
8.080 89 Weighted Average
1.990 Pervious Area
6.090 Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.5 35 0.0730 0.17 Sheet Flow, 35' SHEET
Grass: Dense n= 0.240 P2= 3.46"
5.0 296 0.0200 0.99 Shallow Concentrated Flow, 296' SHALLOW
Short Grass Pasture Kv= 7.0 fps
0.3 278 0.0455 15.36 48.26 Circular Channel (pipe), 278' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.3 171 0.0170 9.39 29.50 Circular Channel (pipe), 171' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 102 0.0397 14.35 45.07 Circular Channel (pipe), 102' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.5 449 0.0397 14.35 45.07 Circular Channel (pipe), 449' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.2 86 0.0126 8.08 25.39 Circular Channel (pipe), 86' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 30 0.0050 6.67 335.37 Circular Channel (pipe), 30' PIPE
Diam= 96.0" Area= 50.3 sf Perim= 25.1' r= 2.00'
n= 0.025 Corrugated metal
0.2 123 0.0100 13.26 260.44 Circular Channel (pipe), 123' PIPE
Diam= 60.0" Area= 19.6 sf Perim= 15.7' r= 1.25'
n= 0.013 Corrugated PE, smooth interior
10.2 1,570 Total
Type II 24-hr 1 YR Rainfall=2.86"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=8.080 ac
Runoff Volume=1.194 af
Runoff Depth=1.77"
Flow Length=1,570'
Tc=10.2 min
CN=89
21.67 cfs
Type II 24-hr 1 YR Rainfall=2.86"POST 2 WITH UNDERGROUND STORAGE_REV-1
Page 6Prepared by {enter your company name here}
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Pond 2P: Underground Detention
Inflow Area = 8.080 ac, Inflow Depth = 1.77" for 1 YR event
Inflow = 21.67 cfs @ 12.02 hrs, Volume= 1.194 af
Outflow = 12.14 cfs @ 12.12 hrs, Volume= 1.194 af, Atten= 44%, Lag= 6.4 min
Discarded = 11.69 cfs @ 12.12 hrs, Volume= 1.179 af
Primary = 0.45 cfs @ 12.12 hrs, Volume= 0.015 af
Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Peak Elev= 584.85' @ 12.12 hrs Surf.Area= 0.177 ac Storage= 0.173 af
Plug-Flow detention time= 3.4 min calculated for 1.194 af (100% of inflow)
Center-of-Mass det. time= 3.4 min ( 819.8 - 816.5 )
Volume Invert Avail.Storage Storage Description
#1 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#2 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#3 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#4 587.51' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0100 '/'
#5 584.07' 0.008 af 24.0"D x 108.00'L Horizontal Cylinder S= 0.0100 '/'
#6 585.25' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0397 '/'
#7 586.10' 0.007 af 24.0"D x 102.00'L Horizontal Cylinder S= 0.0397 '/'
#8 590.25' 0.012 af 24.0"D x 171.00'L Horizontal Cylinder S= 0.0170 '/'
#9 582.56' 0.003 af 4.00'D x 11.96'H Vertical Cone/Cylinder
#10 585.15' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
#11 586.00' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
1.753 af Total Available Storage
Device Routing Invert Outlet Devices
#1 Primary 581.99'60.0" x 36.0' long Culvert CPP, square edge headwall, Ke= 0.500
Outlet Invert= 581.63' S= 0.0100 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior
#2 Discarded 582.21'18.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 583.55'4.0" Vert. Orifice/Grate C= 0.600
#4 Device 1 585.60'36.0" Vert. Orifice/Grate C= 0.600
Discarded OutFlow Max=11.70 cfs @ 12.12 hrs HW=584.85' (Free Discharge)
2=Orifice/Grate (Orifice Controls 11.70 cfs @ 6.62 fps)
Primary OutFlow Max=0.45 cfs @ 12.12 hrs HW=584.85' (Free Discharge)
1=Culvert (Passes 0.45 cfs of 52.10 cfs potential flow)
3=Orifice/Grate (Orifice Controls 0.45 cfs @ 5.13 fps)
4=Orifice/Grate ( Controls 0.00 cfs)
Type II 24-hr 1 YR Rainfall=2.86"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Pond 2P: Underground Detention
Inflow
Outflow
Discarded
Primary
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=8.080 ac
Peak Elev=584.85'
Storage=0.173 af
21.67 cfs
12.14 cfs
11.69 cfs
0.45 cfs
Type II 24-hr 1.24" Rainfall=1.24"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=8.080 ac Runoff Depth=0.44"Subcatchment 1S: POST 2
Flow Length=1,570' Tc=10.2 min CN=89 Runoff=5.40 cfs 0.298 af
Peak Elev=583.29' Storage=0.013 af Inflow=5.40 cfs 0.298 afPond 2P: Underground Detention
Discarded=4.83 cfs 0.298 af Primary=0.00 cfs 0.000 af Outflow=4.83 cfs 0.298 af
Total Runoff Area = 8.080 ac Runoff Volume = 0.298 af Average Runoff Depth = 0.44"
24.63% Pervious Area = 1.990 ac 75.37% Impervious Area = 6.090 ac
Type II 24-hr 1.24" Rainfall=1.24"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff = 5.40 cfs @ 12.03 hrs, Volume= 0.298 af, Depth= 0.44"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1.24" Rainfall=1.24"
Area (ac) CN Description
1.990 61 >75% Grass cover, Good, HSG B
6.090 98 Paved parking & roofs
8.080 89 Weighted Average
1.990 Pervious Area
6.090 Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.5 35 0.0730 0.17 Sheet Flow, 35' SHEET
Grass: Dense n= 0.240 P2= 3.46"
5.0 296 0.0200 0.99 Shallow Concentrated Flow, 296' SHALLOW
Short Grass Pasture Kv= 7.0 fps
0.3 278 0.0455 15.36 48.26 Circular Channel (pipe), 278' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.3 171 0.0170 9.39 29.50 Circular Channel (pipe), 171' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 102 0.0397 14.35 45.07 Circular Channel (pipe), 102' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.5 449 0.0397 14.35 45.07 Circular Channel (pipe), 449' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.2 86 0.0126 8.08 25.39 Circular Channel (pipe), 86' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 30 0.0050 6.67 335.37 Circular Channel (pipe), 30' PIPE
Diam= 96.0" Area= 50.3 sf Perim= 25.1' r= 2.00'
n= 0.025 Corrugated metal
0.2 123 0.0100 13.26 260.44 Circular Channel (pipe), 123' PIPE
Diam= 60.0" Area= 19.6 sf Perim= 15.7' r= 1.25'
n= 0.013 Corrugated PE, smooth interior
10.2 1,570 Total
Type II 24-hr 1.24" Rainfall=1.24"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)6
5
4
3
2
1
0
Type II 24-hr 1.24"
Rainfall=1.24"
Runoff Area=8.080 ac
Runoff Volume=0.298 af
Runoff Depth=0.44"
Flow Length=1,570'
Tc=10.2 min
CN=89
5.40 cfs
Type II 24-hr 1.24" Rainfall=1.24"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Pond 2P: Underground Detention
Inflow Area = 8.080 ac, Inflow Depth = 0.44" for 1.24" event
Inflow = 5.40 cfs @ 12.03 hrs, Volume= 0.298 af
Outflow = 4.83 cfs @ 12.07 hrs, Volume= 0.298 af, Atten= 11%, Lag= 2.6 min
Discarded = 4.83 cfs @ 12.07 hrs, Volume= 0.298 af
Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Peak Elev= 583.29' @ 12.07 hrs Surf.Area= 0.038 ac Storage= 0.013 af
Plug-Flow detention time= 0.6 min calculated for 0.298 af (100% of inflow)
Center-of-Mass det. time= 0.6 min ( 857.3 - 856.7 )
Volume Invert Avail.Storage Storage Description
#1 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#2 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#3 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#4 587.51' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0100 '/'
#5 584.07' 0.008 af 24.0"D x 108.00'L Horizontal Cylinder S= 0.0100 '/'
#6 585.25' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0397 '/'
#7 586.10' 0.007 af 24.0"D x 102.00'L Horizontal Cylinder S= 0.0397 '/'
#8 590.25' 0.012 af 24.0"D x 171.00'L Horizontal Cylinder S= 0.0170 '/'
#9 582.56' 0.003 af 4.00'D x 11.96'H Vertical Cone/Cylinder
#10 585.15' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
#11 586.00' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
1.753 af Total Available Storage
Device Routing Invert Outlet Devices
#1 Primary 581.99'60.0" x 36.0' long Culvert CPP, square edge headwall, Ke= 0.500
Outlet Invert= 581.63' S= 0.0100 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior
#2 Discarded 582.21'18.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 583.55'4.0" Vert. Orifice/Grate C= 0.600
#4 Device 1 585.60'36.0" Vert. Orifice/Grate C= 0.600
Discarded OutFlow Max=4.83 cfs @ 12.07 hrs HW=583.29' (Free Discharge)
2=Orifice/Grate (Orifice Controls 4.83 cfs @ 3.54 fps)
Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=582.46' (Free Discharge)
1=Culvert (Passes 0.00 cfs of 2.03 cfs potential flow)
3=Orifice/Grate ( Controls 0.00 cfs)
4=Orifice/Grate ( Controls 0.00 cfs)
Type II 24-hr 1.24" Rainfall=1.24"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Pond 2P: Underground Detention
Inflow
Outflow
Discarded
Primary
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)6
5
4
3
2
1
0
Inflow Area=8.080 ac
Peak Elev=583.29'
Storage=0.013 af
5.40 cfs
4.83 cfs4.83 cfs
0.00 cfs
Type II 24-hr 2 YR Rainfall=3.46"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=8.080 ac Runoff Depth=2.32"Subcatchment 1S: POST 2
Flow Length=1,570' Tc=10.2 min CN=89 Runoff=28.06 cfs 1.562 af
Peak Elev=585.35' Storage=0.270 af Inflow=28.06 cfs 1.562 afPond 2P: Underground Detention
Discarded=13.14 cfs 1.538 af Primary=0.54 cfs 0.024 af Outflow=13.68 cfs 1.562 af
Total Runoff Area = 8.080 ac Runoff Volume = 1.562 af Average Runoff Depth = 2.32"
24.63% Pervious Area = 1.990 ac 75.37% Impervious Area = 6.090 ac
Type II 24-hr 2 YR Rainfall=3.46"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff = 28.06 cfs @ 12.02 hrs, Volume= 1.562 af, Depth= 2.32"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
1.990 61 >75% Grass cover, Good, HSG B
6.090 98 Paved parking & roofs
8.080 89 Weighted Average
1.990 Pervious Area
6.090 Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.5 35 0.0730 0.17 Sheet Flow, 35' SHEET
Grass: Dense n= 0.240 P2= 3.46"
5.0 296 0.0200 0.99 Shallow Concentrated Flow, 296' SHALLOW
Short Grass Pasture Kv= 7.0 fps
0.3 278 0.0455 15.36 48.26 Circular Channel (pipe), 278' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.3 171 0.0170 9.39 29.50 Circular Channel (pipe), 171' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 102 0.0397 14.35 45.07 Circular Channel (pipe), 102' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.5 449 0.0397 14.35 45.07 Circular Channel (pipe), 449' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.2 86 0.0126 8.08 25.39 Circular Channel (pipe), 86' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 30 0.0050 6.67 335.37 Circular Channel (pipe), 30' PIPE
Diam= 96.0" Area= 50.3 sf Perim= 25.1' r= 2.00'
n= 0.025 Corrugated metal
0.2 123 0.0100 13.26 260.44 Circular Channel (pipe), 123' PIPE
Diam= 60.0" Area= 19.6 sf Perim= 15.7' r= 1.25'
n= 0.013 Corrugated PE, smooth interior
10.2 1,570 Total
Type II 24-hr 2 YR Rainfall=3.46"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=8.080 ac
Runoff Volume=1.562 af
Runoff Depth=2.32"
Flow Length=1,570'
Tc=10.2 min
CN=89
28.06 cfs
Type II 24-hr 2 YR Rainfall=3.46"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Pond 2P: Underground Detention
Inflow Area = 8.080 ac, Inflow Depth = 2.32" for 2 YR event
Inflow = 28.06 cfs @ 12.02 hrs, Volume= 1.562 af
Outflow = 13.68 cfs @ 12.14 hrs, Volume= 1.562 af, Atten= 51%, Lag= 7.3 min
Discarded = 13.14 cfs @ 12.14 hrs, Volume= 1.538 af
Primary = 0.54 cfs @ 12.14 hrs, Volume= 0.024 af
Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Peak Elev= 585.35' @ 12.14 hrs Surf.Area= 0.212 ac Storage= 0.270 af
Plug-Flow detention time= 4.8 min calculated for 1.562 af (100% of inflow)
Center-of-Mass det. time= 4.8 min ( 813.6 - 808.8 )
Volume Invert Avail.Storage Storage Description
#1 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#2 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#3 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#4 587.51' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0100 '/'
#5 584.07' 0.008 af 24.0"D x 108.00'L Horizontal Cylinder S= 0.0100 '/'
#6 585.25' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0397 '/'
#7 586.10' 0.007 af 24.0"D x 102.00'L Horizontal Cylinder S= 0.0397 '/'
#8 590.25' 0.012 af 24.0"D x 171.00'L Horizontal Cylinder S= 0.0170 '/'
#9 582.56' 0.003 af 4.00'D x 11.96'H Vertical Cone/Cylinder
#10 585.15' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
#11 586.00' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
1.753 af Total Available Storage
Device Routing Invert Outlet Devices
#1 Primary 581.99'60.0" x 36.0' long Culvert CPP, square edge headwall, Ke= 0.500
Outlet Invert= 581.63' S= 0.0100 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior
#2 Discarded 582.21'18.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 583.55'4.0" Vert. Orifice/Grate C= 0.600
#4 Device 1 585.60'36.0" Vert. Orifice/Grate C= 0.600
Discarded OutFlow Max=13.14 cfs @ 12.14 hrs HW=585.35' (Free Discharge)
2=Orifice/Grate (Orifice Controls 13.14 cfs @ 7.44 fps)
Primary OutFlow Max=0.54 cfs @ 12.14 hrs HW=585.35' (Free Discharge)
1=Culvert (Passes 0.54 cfs of 68.13 cfs potential flow)
3=Orifice/Grate (Orifice Controls 0.54 cfs @ 6.15 fps)
4=Orifice/Grate ( Controls 0.00 cfs)
Type II 24-hr 2 YR Rainfall=3.46"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Pond 2P: Underground Detention
Inflow
Outflow
Discarded
Primary
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=8.080 ac
Peak Elev=585.35'
Storage=0.270 af
28.06 cfs
13.68 cfs
13.14 cfs
0.54 cfs
Type II 24-hr 10 YR Rainfall=4.96"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=8.080 ac Runoff Depth=3.73"Subcatchment 1S: POST 2
Flow Length=1,570' Tc=10.2 min CN=89 Runoff=44.05 cfs 2.514 af
Peak Elev=586.41' Storage=0.520 af Inflow=44.05 cfs 2.514 afPond 2P: Underground Detention
Discarded=15.81 cfs 2.390 af Primary=5.50 cfs 0.124 af Outflow=21.31 cfs 2.514 af
Total Runoff Area = 8.080 ac Runoff Volume = 2.514 af Average Runoff Depth = 3.73"
24.63% Pervious Area = 1.990 ac 75.37% Impervious Area = 6.090 ac
Type II 24-hr 10 YR Rainfall=4.96"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff = 44.05 cfs @ 12.01 hrs, Volume= 2.514 af, Depth= 3.73"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
1.990 61 >75% Grass cover, Good, HSG B
6.090 98 Paved parking & roofs
8.080 89 Weighted Average
1.990 Pervious Area
6.090 Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.5 35 0.0730 0.17 Sheet Flow, 35' SHEET
Grass: Dense n= 0.240 P2= 3.46"
5.0 296 0.0200 0.99 Shallow Concentrated Flow, 296' SHALLOW
Short Grass Pasture Kv= 7.0 fps
0.3 278 0.0455 15.36 48.26 Circular Channel (pipe), 278' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.3 171 0.0170 9.39 29.50 Circular Channel (pipe), 171' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 102 0.0397 14.35 45.07 Circular Channel (pipe), 102' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.5 449 0.0397 14.35 45.07 Circular Channel (pipe), 449' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.2 86 0.0126 8.08 25.39 Circular Channel (pipe), 86' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 30 0.0050 6.67 335.37 Circular Channel (pipe), 30' PIPE
Diam= 96.0" Area= 50.3 sf Perim= 25.1' r= 2.00'
n= 0.025 Corrugated metal
0.2 123 0.0100 13.26 260.44 Circular Channel (pipe), 123' PIPE
Diam= 60.0" Area= 19.6 sf Perim= 15.7' r= 1.25'
n= 0.013 Corrugated PE, smooth interior
10.2 1,570 Total
Type II 24-hr 10 YR Rainfall=4.96"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=8.080 ac
Runoff Volume=2.514 af
Runoff Depth=3.73"
Flow Length=1,570'
Tc=10.2 min
CN=89
44.05 cfs
Type II 24-hr 10 YR Rainfall=4.96"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Pond 2P: Underground Detention
Inflow Area = 8.080 ac, Inflow Depth = 3.73" for 10 YR event
Inflow = 44.05 cfs @ 12.01 hrs, Volume= 2.514 af
Outflow = 21.31 cfs @ 12.14 hrs, Volume= 2.514 af, Atten= 52%, Lag= 7.3 min
Discarded = 15.81 cfs @ 12.14 hrs, Volume= 2.390 af
Primary = 5.50 cfs @ 12.14 hrs, Volume= 0.124 af
Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Peak Elev= 586.41' @ 12.14 hrs Surf.Area= 0.250 ac Storage= 0.520 af
Plug-Flow detention time= 7.4 min calculated for 2.513 af (100% of inflow)
Center-of-Mass det. time= 7.4 min ( 802.7 - 795.4 )
Volume Invert Avail.Storage Storage Description
#1 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#2 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#3 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#4 587.51' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0100 '/'
#5 584.07' 0.008 af 24.0"D x 108.00'L Horizontal Cylinder S= 0.0100 '/'
#6 585.25' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0397 '/'
#7 586.10' 0.007 af 24.0"D x 102.00'L Horizontal Cylinder S= 0.0397 '/'
#8 590.25' 0.012 af 24.0"D x 171.00'L Horizontal Cylinder S= 0.0170 '/'
#9 582.56' 0.003 af 4.00'D x 11.96'H Vertical Cone/Cylinder
#10 585.15' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
#11 586.00' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
1.753 af Total Available Storage
Device Routing Invert Outlet Devices
#1 Primary 581.99'60.0" x 36.0' long Culvert CPP, square edge headwall, Ke= 0.500
Outlet Invert= 581.63' S= 0.0100 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior
#2 Discarded 582.21'18.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 583.55'4.0" Vert. Orifice/Grate C= 0.600
#4 Device 1 585.60'36.0" Vert. Orifice/Grate C= 0.600
Discarded OutFlow Max=15.81 cfs @ 12.14 hrs HW=586.41' (Free Discharge)
2=Orifice/Grate (Orifice Controls 15.81 cfs @ 8.95 fps)
Primary OutFlow Max=5.42 cfs @ 12.14 hrs HW=586.41' (Free Discharge)
1=Culvert (Passes 5.42 cfs of 105.89 cfs potential flow)
3=Orifice/Grate (Orifice Controls 0.69 cfs @ 7.90 fps)
4=Orifice/Grate (Orifice Controls 4.73 cfs @ 3.07 fps)
Type II 24-hr 10 YR Rainfall=4.96"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Pond 2P: Underground Detention
Inflow
Outflow
Discarded
Primary
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)45
40
35
30
25
20
15
10
5
0
Inflow Area=8.080 ac
Peak Elev=586.41'
Storage=0.520 af
44.05 cfs
21.31 cfs
15.81 cfs
5.50 cfs
Type II 24-hr 100 YR Rainfall=7.26"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=8.080 ac Runoff Depth=5.96"Subcatchment 1S: POST 2
Flow Length=1,570' Tc=10.2 min CN=89 Runoff=68.39 cfs 4.014 af
Peak Elev=587.53' Storage=0.808 af Inflow=68.39 cfs 4.014 afPond 2P: Underground Detention
Discarded=18.19 cfs 3.442 af Primary=23.54 cfs 0.572 af Outflow=41.73 cfs 4.014 af
Total Runoff Area = 8.080 ac Runoff Volume = 4.014 af Average Runoff Depth = 5.96"
24.63% Pervious Area = 1.990 ac 75.37% Impervious Area = 6.090 ac
Type II 24-hr 100 YR Rainfall=7.26"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff = 68.39 cfs @ 12.01 hrs, Volume= 4.014 af, Depth= 5.96"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
1.990 61 >75% Grass cover, Good, HSG B
6.090 98 Paved parking & roofs
8.080 89 Weighted Average
1.990 Pervious Area
6.090 Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.5 35 0.0730 0.17 Sheet Flow, 35' SHEET
Grass: Dense n= 0.240 P2= 3.46"
5.0 296 0.0200 0.99 Shallow Concentrated Flow, 296' SHALLOW
Short Grass Pasture Kv= 7.0 fps
0.3 278 0.0455 15.36 48.26 Circular Channel (pipe), 278' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.3 171 0.0170 9.39 29.50 Circular Channel (pipe), 171' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 102 0.0397 14.35 45.07 Circular Channel (pipe), 102' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.5 449 0.0397 14.35 45.07 Circular Channel (pipe), 449' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.2 86 0.0126 8.08 25.39 Circular Channel (pipe), 86' PIPE
Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013 Corrugated PE, smooth interior
0.1 30 0.0050 6.67 335.37 Circular Channel (pipe), 30' PIPE
Diam= 96.0" Area= 50.3 sf Perim= 25.1' r= 2.00'
n= 0.025 Corrugated metal
0.2 123 0.0100 13.26 260.44 Circular Channel (pipe), 123' PIPE
Diam= 60.0" Area= 19.6 sf Perim= 15.7' r= 1.25'
n= 0.013 Corrugated PE, smooth interior
10.2 1,570 Total
Type II 24-hr 100 YR Rainfall=7.26"POST 2 WITH UNDERGROUND STORAGE_REV-1
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Subcatchment 1S: POST 2
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=8.080 ac
Runoff Volume=4.014 af
Runoff Depth=5.96"
Flow Length=1,570'
Tc=10.2 min
CN=89
68.39 cfs
Type II 24-hr 100 YR Rainfall=7.26"POST 2 WITH UNDERGROUND STORAGE_REV-1
Page 26Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Pond 2P: Underground Detention
Inflow Area = 8.080 ac, Inflow Depth = 5.96" for 100 YR event
Inflow = 68.39 cfs @ 12.01 hrs, Volume= 4.014 af
Outflow = 41.73 cfs @ 12.11 hrs, Volume= 4.014 af, Atten= 39%, Lag= 5.9 min
Discarded = 18.19 cfs @ 12.11 hrs, Volume= 3.442 af
Primary = 23.54 cfs @ 12.11 hrs, Volume= 0.572 af
Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Peak Elev= 587.53' @ 12.11 hrs Surf.Area= 0.263 ac Storage= 0.808 af
Plug-Flow detention time= 8.0 min calculated for 4.014 af (100% of inflow)
Center-of-Mass det. time= 7.9 min ( 790.5 - 782.6 )
Volume Invert Avail.Storage Storage Description
#1 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#2 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#3 582.46' 0.552 af 96.0"D x 478.00'L Horizontal Cylinder S= 0.0050 '/'
#4 587.51' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0100 '/'
#5 584.07' 0.008 af 24.0"D x 108.00'L Horizontal Cylinder S= 0.0100 '/'
#6 585.25' 0.032 af 24.0"D x 449.00'L Horizontal Cylinder S= 0.0397 '/'
#7 586.10' 0.007 af 24.0"D x 102.00'L Horizontal Cylinder S= 0.0397 '/'
#8 590.25' 0.012 af 24.0"D x 171.00'L Horizontal Cylinder S= 0.0170 '/'
#9 582.56' 0.003 af 4.00'D x 11.96'H Vertical Cone/Cylinder
#10 585.15' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
#11 586.00' 0.001 af 4.00'D x 4.10'H Vertical Cone/Cylinder
1.753 af Total Available Storage
Device Routing Invert Outlet Devices
#1 Primary 581.99'60.0" x 36.0' long Culvert CPP, square edge headwall, Ke= 0.500
Outlet Invert= 581.63' S= 0.0100 '/' Cc= 0.900
n= 0.013 Corrugated PE, smooth interior
#2 Discarded 582.21'18.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 583.55'4.0" Vert. Orifice/Grate C= 0.600
#4 Device 1 585.60'36.0" Vert. Orifice/Grate C= 0.600
Discarded OutFlow Max=18.19 cfs @ 12.11 hrs HW=587.53' (Free Discharge)
2=Orifice/Grate (Orifice Controls 18.19 cfs @ 10.29 fps)
Primary OutFlow Max=23.52 cfs @ 12.11 hrs HW=587.53' (Free Discharge)
1=Culvert (Passes 23.52 cfs of 146.02 cfs potential flow)
3=Orifice/Grate (Orifice Controls 0.82 cfs @ 9.40 fps)
4=Orifice/Grate (Orifice Controls 22.70 cfs @ 4.73 fps)
Type II 24-hr 100 YR Rainfall=7.26"POST 2 WITH UNDERGROUND STORAGE_REV-1
Page 27Prepared by {enter your company name here}
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Pond 2P: Underground Detention
Inflow
Outflow
Discarded
Primary
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=8.080 ac
Peak Elev=587.53'
Storage=0.808 af
68.39 cfs
41.73 cfs
18.19 cfs23.54 cfs
1S
PRE 3
Drainage Diagram for PRE 3
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
PRE 3
Page 2Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area (acres)CN Description (subcats)
0.400 55 Woods, Good, HSG B (1S)

0.400
Type II 24-hr 1 YR Rainfall=2.86"PRE 3
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.400 ac Runoff Depth=0.16"Subcatchment 1S: PRE 3
Flow Length=245' Slope=0.1000 '/' Tc=17.2 min CN=55 Runoff=0.02 cfs 0.005 af
Total Runoff Area = 0.400 ac Runoff Volume = 0.005 af Average Runoff Depth = 0.16"
100.00% Pervious Area = 0.400 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"PRE 3
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 3
Runoff = 0.02 cfs @ 12.23 hrs, Volume= 0.005 af, Depth= 0.16"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
0.400 55 Woods, Good, HSG B
0.400 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
17.0 175 0.1000 0.17 Sheet Flow, 175' SHEET
Woods: Light underbrush n= 0.400 P2= 3.46"
0.2 70 0.1000 4.74 Shallow Concentrated Flow, 70' SHALLOW
Grassed Waterway Kv= 15.0 fps
17.2 245 Total
Subcatchment 1S: PRE 3
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.018
0.017
0.016
0.015
0.014
0.013
0.012
0.011
0.01
0.009
0.008
0.007
0.006
0.005
0.004
0.003
0.002
0.001
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=0.400 ac
Runoff Volume=0.005 af
Runoff Depth=0.16"
Flow Length=245'
Slope=0.1000 '/'
Tc=17.2 min
CN=55
0.02 cfs
Type II 24-hr 2 YR Rainfall=3.46"PRE 3
Page 5Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.400 ac Runoff Depth=0.33"Subcatchment 1S: PRE 3
Flow Length=245' Slope=0.1000 '/' Tc=17.2 min CN=55 Runoff=0.08 cfs 0.011 af
Total Runoff Area = 0.400 ac Runoff Volume = 0.011 af Average Runoff Depth = 0.33"
100.00% Pervious Area = 0.400 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"PRE 3
Page 6Prepared by {enter your company name here}
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Subcatchment 1S: PRE 3
Runoff = 0.08 cfs @ 12.17 hrs, Volume= 0.011 af, Depth= 0.33"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
0.400 55 Woods, Good, HSG B
0.400 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
17.0 175 0.1000 0.17 Sheet Flow, 175' SHEET
Woods: Light underbrush n= 0.400 P2= 3.46"
0.2 70 0.1000 4.74 Shallow Concentrated Flow, 70' SHALLOW
Grassed Waterway Kv= 15.0 fps
17.2 245 Total
Subcatchment 1S: PRE 3
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.085
0.08
0.075
0.07
0.065
0.06
0.055
0.05
0.045
0.04
0.035
0.03
0.025
0.02
0.015
0.01
0.005
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=0.400 ac
Runoff Volume=0.011 af
Runoff Depth=0.33"
Flow Length=245'
Slope=0.1000 '/'
Tc=17.2 min
CN=55
0.08 cfs
Type II 24-hr 10 YR Rainfall=4.96"PRE 3
Page 7Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.400 ac Runoff Depth=0.96"Subcatchment 1S: PRE 3
Flow Length=245' Slope=0.1000 '/' Tc=17.2 min CN=55 Runoff=0.38 cfs 0.032 af
Total Runoff Area = 0.400 ac Runoff Volume = 0.032 af Average Runoff Depth = 0.96"
100.00% Pervious Area = 0.400 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"PRE 3
Page 8Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 3
Runoff = 0.38 cfs @ 12.13 hrs, Volume= 0.032 af, Depth= 0.96"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
0.400 55 Woods, Good, HSG B
0.400 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
17.0 175 0.1000 0.17 Sheet Flow, 175' SHEET
Woods: Light underbrush n= 0.400 P2= 3.46"
0.2 70 0.1000 4.74 Shallow Concentrated Flow, 70' SHALLOW
Grassed Waterway Kv= 15.0 fps
17.2 245 Total
Subcatchment 1S: PRE 3
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.42
0.4
0.38
0.36
0.34
0.32
0.3
0.28
0.26
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=0.400 ac
Runoff Volume=0.032 af
Runoff Depth=0.96"
Flow Length=245'
Slope=0.1000 '/'
Tc=17.2 min
CN=55
0.38 cfs
Type II 24-hr 100 YR Rainfall=7.26"PRE 3
Page 9Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.400 ac Runoff Depth=2.29"Subcatchment 1S: PRE 3
Flow Length=245' Slope=0.1000 '/' Tc=17.2 min CN=55 Runoff=1.05 cfs 0.076 af
Total Runoff Area = 0.400 ac Runoff Volume = 0.076 af Average Runoff Depth = 2.29"
100.00% Pervious Area = 0.400 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"PRE 3
Page 10Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 3
Runoff = 1.05 cfs @ 12.10 hrs, Volume= 0.076 af, Depth= 2.29"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
0.400 55 Woods, Good, HSG B
0.400 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
17.0 175 0.1000 0.17 Sheet Flow, 175' SHEET
Woods: Light underbrush n= 0.400 P2= 3.46"
0.2 70 0.1000 4.74 Shallow Concentrated Flow, 70' SHALLOW
Grassed Waterway Kv= 15.0 fps
17.2 245 Total
Subcatchment 1S: PRE 3
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=0.400 ac
Runoff Volume=0.076 af
Runoff Depth=2.29"
Flow Length=245'
Slope=0.1000 '/'
Tc=17.2 min
CN=55
1.05 cfs
1S
PRE 4
Drainage Diagram for PRE 4
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
PRE 4
Page 2Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area (acres)CN Description (subcats)
1.690 55 Woods, Good, HSG B (1S)
0.430 61 >75% Grass cover, Good, HSG B (1S)

2.120
Type II 24-hr 1 YR Rainfall=2.86"PRE 4
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=2.120 ac Runoff Depth=0.18"Subcatchment 1S: PRE 4
Flow Length=787' Slope=0.1000 '/' Tc=31.2 min CN=56 Runoff=0.10 cfs 0.032 af
Total Runoff Area = 2.120 ac Runoff Volume = 0.032 af Average Runoff Depth = 0.18"
100.00% Pervious Area = 2.120 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"PRE 4
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 4
Runoff = 0.10 cfs @ 12.48 hrs, Volume= 0.032 af, Depth= 0.18"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
1.690 55 Woods, Good, HSG B
0.430 61 >75% Grass cover, Good, HSG B
2.120 56 Weighted Average
2.120 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.1 300 0.1000 0.19 Sheet Flow, 300' - SHEET
Woods: Light underbrush n= 0.400 P2= 3.46"
5.1 487 0.1000 1.58 Shallow Concentrated Flow, 487' - SHALLOW
Woodland Kv= 5.0 fps
31.2 787 Total
Subcatchment 1S: PRE 4
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.11
0.105
0.1
0.095
0.09
0.085
0.08
0.075
0.07
0.065
0.06
0.055
0.05
0.045
0.04
0.035
0.03
0.025
0.02
0.015
0.01
0.005
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=2.120 ac
Runoff Volume=0.032 af
Runoff Depth=0.18"
Flow Length=787'
Slope=0.1000 '/'
Tc=31.2 min
CN=56
0.10 cfs
Type II 24-hr 2 YR Rainfall=3.46"PRE 4
Page 5Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=2.120 ac Runoff Depth=0.37"Subcatchment 1S: PRE 4
Flow Length=787' Slope=0.1000 '/' Tc=31.2 min CN=56 Runoff=0.34 cfs 0.065 af
Total Runoff Area = 2.120 ac Runoff Volume = 0.065 af Average Runoff Depth = 0.37"
100.00% Pervious Area = 2.120 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"PRE 4
Page 6Prepared by {enter your company name here}
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Subcatchment 1S: PRE 4
Runoff = 0.34 cfs @ 12.38 hrs, Volume= 0.065 af, Depth= 0.37"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
1.690 55 Woods, Good, HSG B
0.430 61 >75% Grass cover, Good, HSG B
2.120 56 Weighted Average
2.120 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.1 300 0.1000 0.19 Sheet Flow, 300' - SHEET
Woods: Light underbrush n= 0.400 P2= 3.46"
5.1 487 0.1000 1.58 Shallow Concentrated Flow, 487' - SHALLOW
Woodland Kv= 5.0 fps
31.2 787 Total
Subcatchment 1S: PRE 4
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.36
0.34
0.32
0.3
0.28
0.26
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=2.120 ac
Runoff Volume=0.065 af
Runoff Depth=0.37"
Flow Length=787'
Slope=0.1000 '/'
Tc=31.2 min
CN=56
0.34 cfs
Type II 24-hr 10 YR Rainfall=4.96"PRE 4
Page 7Prepared by {enter your company name here}
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Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=2.120 ac Runoff Depth=1.02"Subcatchment 1S: PRE 4
Flow Length=787' Slope=0.1000 '/' Tc=31.2 min CN=56 Runoff=1.46 cfs 0.180 af
Total Runoff Area = 2.120 ac Runoff Volume = 0.180 af Average Runoff Depth = 1.02"
100.00% Pervious Area = 2.120 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"PRE 4
Page 8Prepared by {enter your company name here}
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Subcatchment 1S: PRE 4
Runoff = 1.46 cfs @ 12.31 hrs, Volume= 0.180 af, Depth= 1.02"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
1.690 55 Woods, Good, HSG B
0.430 61 >75% Grass cover, Good, HSG B
2.120 56 Weighted Average
2.120 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.1 300 0.1000 0.19 Sheet Flow, 300' - SHEET
Woods: Light underbrush n= 0.400 P2= 3.46"
5.1 487 0.1000 1.58 Shallow Concentrated Flow, 487' - SHALLOW
Woodland Kv= 5.0 fps
31.2 787 Total
Subcatchment 1S: PRE 4
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)1
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=2.120 ac
Runoff Volume=0.180 af
Runoff Depth=1.02"
Flow Length=787'
Slope=0.1000 '/'
Tc=31.2 min
CN=56
1.46 cfs
Type II 24-hr 100 YR Rainfall=7.26"PRE 4
Page 9Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=2.120 ac Runoff Depth=2.39"Subcatchment 1S: PRE 4
Flow Length=787' Slope=0.1000 '/' Tc=31.2 min CN=56 Runoff=3.99 cfs 0.422 af
Total Runoff Area = 2.120 ac Runoff Volume = 0.422 af Average Runoff Depth = 2.39"
100.00% Pervious Area = 2.120 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"PRE 4
Page 10Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 4
Runoff = 3.99 cfs @ 12.28 hrs, Volume= 0.422 af, Depth= 2.39"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
1.690 55 Woods, Good, HSG B
0.430 61 >75% Grass cover, Good, HSG B
2.120 56 Weighted Average
2.120 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.1 300 0.1000 0.19 Sheet Flow, 300' - SHEET
Woods: Light underbrush n= 0.400 P2= 3.46"
5.1 487 0.1000 1.58 Shallow Concentrated Flow, 487' - SHALLOW
Woodland Kv= 5.0 fps
31.2 787 Total
Subcatchment 1S: PRE 4
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)4
3
2
1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=2.120 ac
Runoff Volume=0.422 af
Runoff Depth=2.39"
Flow Length=787'
Slope=0.1000 '/'
Tc=31.2 min
CN=56
3.99 cfs
1S
POST 4
Drainage Diagram for POST 4
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
POST 4
Page 2Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area (acres)CN Description (subcats)
0.740 61 >75% Grass cover, Good, HSG B (1S)

0.740
Type II 24-hr 1 YR Rainfall=2.86"POST 4
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.740 ac Runoff Depth=0.31"Subcatchment 1S: POST 4
Flow Length=300' Slope=0.0417 '/' Tc=12.7 min CN=61 Runoff=0.19 cfs 0.019 af
Total Runoff Area = 0.740 ac Runoff Volume = 0.019 af Average Runoff Depth = 0.31"
100.00% Pervious Area = 0.740 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"POST 4
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 4
Runoff = 0.19 cfs @ 12.09 hrs, Volume= 0.019 af, Depth= 0.31"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
0.740 61 >75% Grass cover, Good, HSG B
0.740 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.2 200 0.0417 0.27 Sheet Flow, 200' SHEET
Grass: Short n= 0.150 P2= 3.46"
0.5 100 0.0417 3.29 Shallow Concentrated Flow, 100' SHALLOW
Unpaved Kv= 16.1 fps
12.7 300 Total
Subcatchment 1S: POST 4
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.21
0.2
0.19
0.18
0.17
0.16
0.15
0.14
0.13
0.12
0.11
0.1
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=0.740 ac
Runoff Volume=0.019 af
Runoff Depth=0.31"
Flow Length=300'
Slope=0.0417 '/'
Tc=12.7 min
CN=61
0.19 cfs
Type II 24-hr 2 YR Rainfall=3.46"POST 4
Page 5Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.740 ac Runoff Depth=0.55"Subcatchment 1S: POST 4
Flow Length=300' Slope=0.0417 '/' Tc=12.7 min CN=61 Runoff=0.45 cfs 0.034 af
Total Runoff Area = 0.740 ac Runoff Volume = 0.034 af Average Runoff Depth = 0.55"
100.00% Pervious Area = 0.740 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"POST 4
Page 6Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 4
Runoff = 0.45 cfs @ 12.07 hrs, Volume= 0.034 af, Depth= 0.55"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
0.740 61 >75% Grass cover, Good, HSG B
0.740 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.2 200 0.0417 0.27 Sheet Flow, 200' SHEET
Grass: Short n= 0.150 P2= 3.46"
0.5 100 0.0417 3.29 Shallow Concentrated Flow, 100' SHALLOW
Unpaved Kv= 16.1 fps
12.7 300 Total
Subcatchment 1S: POST 4
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.48
0.46
0.44
0.42
0.4
0.38
0.36
0.34
0.32
0.3
0.28
0.26
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=0.740 ac
Runoff Volume=0.034 af
Runoff Depth=0.55"
Flow Length=300'
Slope=0.0417 '/'
Tc=12.7 min
CN=61
0.45 cfs
Type II 24-hr 10 YR Rainfall=4.96"POST 4
Page 7Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.740 ac Runoff Depth=1.35"Subcatchment 1S: POST 4
Flow Length=300' Slope=0.0417 '/' Tc=12.7 min CN=61 Runoff=1.31 cfs 0.083 af
Total Runoff Area = 0.740 ac Runoff Volume = 0.083 af Average Runoff Depth = 1.35"
100.00% Pervious Area = 0.740 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"POST 4
Page 8Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 4
Runoff = 1.31 cfs @ 12.06 hrs, Volume= 0.083 af, Depth= 1.35"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
0.740 61 >75% Grass cover, Good, HSG B
0.740 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.2 200 0.0417 0.27 Sheet Flow, 200' SHEET
Grass: Short n= 0.150 P2= 3.46"
0.5 100 0.0417 3.29 Shallow Concentrated Flow, 100' SHALLOW
Unpaved Kv= 16.1 fps
12.7 300 Total
Subcatchment 1S: POST 4
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)1
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=0.740 ac
Runoff Volume=0.083 af
Runoff Depth=1.35"
Flow Length=300'
Slope=0.0417 '/'
Tc=12.7 min
CN=61
1.31 cfs
Type II 24-hr 100 YR Rainfall=7.26"POST 4
Page 9Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.740 ac Runoff Depth=2.89"Subcatchment 1S: POST 4
Flow Length=300' Slope=0.0417 '/' Tc=12.7 min CN=61 Runoff=2.97 cfs 0.178 af
Total Runoff Area = 0.740 ac Runoff Volume = 0.178 af Average Runoff Depth = 2.89"
100.00% Pervious Area = 0.740 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"POST 4
Page 10Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 4
Runoff = 2.97 cfs @ 12.05 hrs, Volume= 0.178 af, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
0.740 61 >75% Grass cover, Good, HSG B
0.740 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.2 200 0.0417 0.27 Sheet Flow, 200' SHEET
Grass: Short n= 0.150 P2= 3.46"
0.5 100 0.0417 3.29 Shallow Concentrated Flow, 100' SHALLOW
Unpaved Kv= 16.1 fps
12.7 300 Total
Subcatchment 1S: POST 4
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)3
2
1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=0.740 ac
Runoff Volume=0.178 af
Runoff Depth=2.89"
Flow Length=300'
Slope=0.0417 '/'
Tc=12.7 min
CN=61
2.97 cfs
1S
PRE 5
Drainage Diagram for PRE 5
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
PRE 5
Page 2Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area (acres)CN Description (subcats)
0.870 61 >75% Grass cover, Good, HSG B (1S)

0.870
Type II 24-hr 1 YR Rainfall=2.86"PRE 5
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.870 ac Runoff Depth=0.31"Subcatchment 1S: PRE 5
Flow Length=691' Tc=7.8 min CN=61 Runoff=0.30 cfs 0.023 af
Total Runoff Area = 0.870 ac Runoff Volume = 0.023 af Average Runoff Depth = 0.31"
100.00% Pervious Area = 0.870 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"PRE 5
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 5
Runoff = 0.30 cfs @ 12.03 hrs, Volume= 0.023 af, Depth= 0.31"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
0.870 61 >75% Grass cover, Good, HSG B
0.870 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.5 188 0.1800 0.48 Sheet Flow, 188' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.3 503 0.0200 6.42 5.04 Circular Channel (pipe), 503' PIPE
Diam= 12.0" Area= 0.8 sf Perim= 3.1' r= 0.25'
n= 0.013 Corrugated PE, smooth interior
7.8 691 Total
Subcatchment 1S: PRE 5
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.32
0.3
0.28
0.26
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=0.870 ac
Runoff Volume=0.023 af
Runoff Depth=0.31"
Flow Length=691'
Tc=7.8 min
CN=61
0.30 cfs
Type II 24-hr 2 YR Rainfall=3.46"PRE 5
Page 5Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.870 ac Runoff Depth=0.55"Subcatchment 1S: PRE 5
Flow Length=691' Tc=7.8 min CN=61 Runoff=0.67 cfs 0.040 af
Total Runoff Area = 0.870 ac Runoff Volume = 0.040 af Average Runoff Depth = 0.55"
100.00% Pervious Area = 0.870 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"PRE 5
Page 6Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 5
Runoff = 0.67 cfs @ 12.02 hrs, Volume= 0.040 af, Depth= 0.55"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
0.870 61 >75% Grass cover, Good, HSG B
0.870 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.5 188 0.1800 0.48 Sheet Flow, 188' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.3 503 0.0200 6.42 5.04 Circular Channel (pipe), 503' PIPE
Diam= 12.0" Area= 0.8 sf Perim= 3.1' r= 0.25'
n= 0.013 Corrugated PE, smooth interior
7.8 691 Total
Subcatchment 1S: PRE 5
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=0.870 ac
Runoff Volume=0.040 af
Runoff Depth=0.55"
Flow Length=691'
Tc=7.8 min
CN=61
0.67 cfs
Type II 24-hr 10 YR Rainfall=4.96"PRE 5
Page 7Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.870 ac Runoff Depth=1.35"Subcatchment 1S: PRE 5
Flow Length=691' Tc=7.8 min CN=61 Runoff=1.89 cfs 0.098 af
Total Runoff Area = 0.870 ac Runoff Volume = 0.098 af Average Runoff Depth = 1.35"
100.00% Pervious Area = 0.870 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"PRE 5
Page 8Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 5
Runoff = 1.89 cfs @ 12.00 hrs, Volume= 0.098 af, Depth= 1.35"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
0.870 61 >75% Grass cover, Good, HSG B
0.870 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.5 188 0.1800 0.48 Sheet Flow, 188' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.3 503 0.0200 6.42 5.04 Circular Channel (pipe), 503' PIPE
Diam= 12.0" Area= 0.8 sf Perim= 3.1' r= 0.25'
n= 0.013 Corrugated PE, smooth interior
7.8 691 Total
Subcatchment 1S: PRE 5
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=0.870 ac
Runoff Volume=0.098 af
Runoff Depth=1.35"
Flow Length=691'
Tc=7.8 min
CN=61
1.89 cfs
Type II 24-hr 100 YR Rainfall=7.26"PRE 5
Page 9Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.870 ac Runoff Depth=2.89"Subcatchment 1S: PRE 5
Flow Length=691' Tc=7.8 min CN=61 Runoff=4.20 cfs 0.210 af
Total Runoff Area = 0.870 ac Runoff Volume = 0.210 af Average Runoff Depth = 2.89"
100.00% Pervious Area = 0.870 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"PRE 5
Page 10Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 5
Runoff = 4.20 cfs @ 12.00 hrs, Volume= 0.210 af, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
0.870 61 >75% Grass cover, Good, HSG B
0.870 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.5 188 0.1800 0.48 Sheet Flow, 188' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.3 503 0.0200 6.42 5.04 Circular Channel (pipe), 503' PIPE
Diam= 12.0" Area= 0.8 sf Perim= 3.1' r= 0.25'
n= 0.013 Corrugated PE, smooth interior
7.8 691 Total
Subcatchment 1S: PRE 5
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)4
3
2
1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=0.870 ac
Runoff Volume=0.210 af
Runoff Depth=2.89"
Flow Length=691'
Tc=7.8 min
CN=61
4.20 cfs
1S
POST 5
Drainage Diagram for POST 5
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
POST 5
Page 2Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area (acres)CN Description (subcats)
0.670 61 >75% Grass cover, Good, HSG B (1S)

0.670
Type II 24-hr 1 YR Rainfall=2.86"POST 5
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.670 ac Runoff Depth=0.31"Subcatchment 1S: POST 5
Flow Length=703' Tc=6.6 min CN=61 Runoff=0.25 cfs 0.018 af
Total Runoff Area = 0.670 ac Runoff Volume = 0.018 af Average Runoff Depth = 0.31"
100.00% Pervious Area = 0.670 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"POST 5
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 5
Runoff = 0.25 cfs @ 12.01 hrs, Volume= 0.018 af, Depth= 0.31"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
0.670 61 >75% Grass cover, Good, HSG B
0.670 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.3 200 0.3300 0.62 Sheet Flow, 90' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.3 503 0.0200 6.42 5.04 Circular Channel (pipe), 503' PIPE
Diam= 12.0" Area= 0.8 sf Perim= 3.1' r= 0.25'
n= 0.013 Corrugated PE, smooth interior
6.6 703 Total
Subcatchment 1S: POST 5
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.26
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=0.670 ac
Runoff Volume=0.018 af
Runoff Depth=0.31"
Flow Length=703'
Tc=6.6 min
CN=61
0.25 cfs
Type II 24-hr 2 YR Rainfall=3.46"POST 5
Page 5Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.670 ac Runoff Depth=0.55"Subcatchment 1S: POST 5
Flow Length=703' Tc=6.6 min CN=61 Runoff=0.55 cfs 0.031 af
Total Runoff Area = 0.670 ac Runoff Volume = 0.031 af Average Runoff Depth = 0.55"
100.00% Pervious Area = 0.670 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"POST 5
Page 6Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 5
Runoff = 0.55 cfs @ 12.00 hrs, Volume= 0.031 af, Depth= 0.55"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
0.670 61 >75% Grass cover, Good, HSG B
0.670 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.3 200 0.3300 0.62 Sheet Flow, 90' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.3 503 0.0200 6.42 5.04 Circular Channel (pipe), 503' PIPE
Diam= 12.0" Area= 0.8 sf Perim= 3.1' r= 0.25'
n= 0.013 Corrugated PE, smooth interior
6.6 703 Total
Subcatchment 1S: POST 5
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=0.670 ac
Runoff Volume=0.031 af
Runoff Depth=0.55"
Flow Length=703'
Tc=6.6 min
CN=61
0.55 cfs
Type II 24-hr 10 YR Rainfall=4.96"POST 5
Page 7Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.670 ac Runoff Depth=1.35"Subcatchment 1S: POST 5
Flow Length=703' Tc=6.6 min CN=61 Runoff=1.53 cfs 0.075 af
Total Runoff Area = 0.670 ac Runoff Volume = 0.075 af Average Runoff Depth = 1.35"
100.00% Pervious Area = 0.670 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"POST 5
Page 8Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 5
Runoff = 1.53 cfs @ 11.99 hrs, Volume= 0.075 af, Depth= 1.35"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
0.670 61 >75% Grass cover, Good, HSG B
0.670 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.3 200 0.3300 0.62 Sheet Flow, 90' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.3 503 0.0200 6.42 5.04 Circular Channel (pipe), 503' PIPE
Diam= 12.0" Area= 0.8 sf Perim= 3.1' r= 0.25'
n= 0.013 Corrugated PE, smooth interior
6.6 703 Total
Subcatchment 1S: POST 5
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)1
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=0.670 ac
Runoff Volume=0.075 af
Runoff Depth=1.35"
Flow Length=703'
Tc=6.6 min
CN=61
1.53 cfs
Type II 24-hr 100 YR Rainfall=7.26"POST 5
Page 9Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.670 ac Runoff Depth=2.89"Subcatchment 1S: POST 5
Flow Length=703' Tc=6.6 min CN=61 Runoff=3.39 cfs 0.161 af
Total Runoff Area = 0.670 ac Runoff Volume = 0.161 af Average Runoff Depth = 2.89"
100.00% Pervious Area = 0.670 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"POST 5
Page 10Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 5
Runoff = 3.39 cfs @ 11.98 hrs, Volume= 0.161 af, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
0.670 61 >75% Grass cover, Good, HSG B
0.670 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.3 200 0.3300 0.62 Sheet Flow, 90' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.3 503 0.0200 6.42 5.04 Circular Channel (pipe), 503' PIPE
Diam= 12.0" Area= 0.8 sf Perim= 3.1' r= 0.25'
n= 0.013 Corrugated PE, smooth interior
6.6 703 Total
Subcatchment 1S: POST 5
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)3
2
1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=0.670 ac
Runoff Volume=0.161 af
Runoff Depth=2.89"
Flow Length=703'
Tc=6.6 min
CN=61
3.39 cfs
1S
PRE 6
Drainage Diagram for PRE 6
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
PRE 6
Page 2Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area (acres)CN Description (subcats)
0.960 61 >75% Grass cover, Good, HSG B (1S)

0.960
Type II 24-hr 1 YR Rainfall=2.86"PRE 6
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.960 ac Runoff Depth=0.31"Subcatchment 1S: PRE 6
Flow Length=270' Tc=6.0 min CN=61 Runoff=0.37 cfs 0.025 af
Total Runoff Area = 0.960 ac Runoff Volume = 0.025 af Average Runoff Depth = 0.31"
100.00% Pervious Area = 0.960 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"PRE 6
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 6
Runoff = 0.37 cfs @ 12.00 hrs, Volume= 0.025 af, Depth= 0.31"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
0.960 61 >75% Grass cover, Good, HSG B
0.960 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.2 108 0.1800 0.43 Sheet Flow, 108' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.8 162 0.0100 1.50 Shallow Concentrated Flow, 162' SHALLOW
Grassed Waterway Kv= 15.0 fps
6.0 270 Total
Subcatchment 1S: PRE 6
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.4
0.38
0.36
0.34
0.32
0.3
0.28
0.26
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=0.960 ac
Runoff Volume=0.025 af
Runoff Depth=0.31"
Flow Length=270'
Tc=6.0 min
CN=61
0.37 cfs
Type II 24-hr 2 YR Rainfall=3.46"PRE 6
Page 5Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.960 ac Runoff Depth=0.55"Subcatchment 1S: PRE 6
Flow Length=270' Tc=6.0 min CN=61 Runoff=0.81 cfs 0.044 af
Total Runoff Area = 0.960 ac Runoff Volume = 0.044 af Average Runoff Depth = 0.55"
100.00% Pervious Area = 0.960 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"PRE 6
Page 6Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 6
Runoff = 0.81 cfs @ 11.99 hrs, Volume= 0.044 af, Depth= 0.55"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
0.960 61 >75% Grass cover, Good, HSG B
0.960 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.2 108 0.1800 0.43 Sheet Flow, 108' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.8 162 0.0100 1.50 Shallow Concentrated Flow, 162' SHALLOW
Grassed Waterway Kv= 15.0 fps
6.0 270 Total
Subcatchment 1S: PRE 6
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=0.960 ac
Runoff Volume=0.044 af
Runoff Depth=0.55"
Flow Length=270'
Tc=6.0 min
CN=61
0.81 cfs
Type II 24-hr 10 YR Rainfall=4.96"PRE 6
Page 7Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.960 ac Runoff Depth=1.35"Subcatchment 1S: PRE 6
Flow Length=270' Tc=6.0 min CN=61 Runoff=2.25 cfs 0.108 af
Total Runoff Area = 0.960 ac Runoff Volume = 0.108 af Average Runoff Depth = 1.35"
100.00% Pervious Area = 0.960 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"PRE 6
Page 8Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 6
Runoff = 2.25 cfs @ 11.98 hrs, Volume= 0.108 af, Depth= 1.35"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
0.960 61 >75% Grass cover, Good, HSG B
0.960 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.2 108 0.1800 0.43 Sheet Flow, 108' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.8 162 0.0100 1.50 Shallow Concentrated Flow, 162' SHALLOW
Grassed Waterway Kv= 15.0 fps
6.0 270 Total
Subcatchment 1S: PRE 6
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=0.960 ac
Runoff Volume=0.108 af
Runoff Depth=1.35"
Flow Length=270'
Tc=6.0 min
CN=61
2.25 cfs
Type II 24-hr 100 YR Rainfall=7.26"PRE 6
Page 9Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.960 ac Runoff Depth=2.89"Subcatchment 1S: PRE 6
Flow Length=270' Tc=6.0 min CN=61 Runoff=4.97 cfs 0.231 af
Total Runoff Area = 0.960 ac Runoff Volume = 0.231 af Average Runoff Depth = 2.89"
100.00% Pervious Area = 0.960 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"PRE 6
Page 10Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: PRE 6
Runoff = 4.97 cfs @ 11.98 hrs, Volume= 0.231 af, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
0.960 61 >75% Grass cover, Good, HSG B
0.960 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.2 108 0.1800 0.43 Sheet Flow, 108' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.8 162 0.0100 1.50 Shallow Concentrated Flow, 162' SHALLOW
Grassed Waterway Kv= 15.0 fps
6.0 270 Total
Subcatchment 1S: PRE 6
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)5
4
3
2
1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=0.960 ac
Runoff Volume=0.231 af
Runoff Depth=2.89"
Flow Length=270'
Tc=6.0 min
CN=61
4.97 cfs
1S
POST 6
Drainage Diagram for POST 6
Prepared by {enter your company name here} 4/18/2018
HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
POST 6
Page 2Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Area Listing (all nodes)
Area (acres)CN Description (subcats)
0.940 61 >75% Grass cover, Good, HSG B (1S)

0.940
Type II 24-hr 1 YR Rainfall=2.86"POST 6
Page 3Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.940 ac Runoff Depth=0.31"Subcatchment 1S: POST 6
Flow Length=270' Tc=6.0 min CN=61 Runoff=0.36 cfs 0.025 af
Total Runoff Area = 0.940 ac Runoff Volume = 0.025 af Average Runoff Depth = 0.31"
100.00% Pervious Area = 0.940 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 1 YR Rainfall=2.86"POST 6
Page 4Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 6
Runoff = 0.36 cfs @ 12.00 hrs, Volume= 0.025 af, Depth= 0.31"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 1 YR Rainfall=2.86"
Area (ac) CN Description
0.940 61 >75% Grass cover, Good, HSG B
0.940 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.2 108 0.1800 0.43 Sheet Flow, 108' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.8 162 0.0100 1.50 Shallow Concentrated Flow, 162' SHALLOW
Grassed Waterway Kv= 15.0 fps
6.0 270 Total
Subcatchment 1S: POST 6
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.4
0.38
0.36
0.34
0.32
0.3
0.28
0.26
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
Type II 24-hr 1 YR
Rainfall=2.86"
Runoff Area=0.940 ac
Runoff Volume=0.025 af
Runoff Depth=0.31"
Flow Length=270'
Tc=6.0 min
CN=61
0.36 cfs
Type II 24-hr 2 YR Rainfall=3.46"POST 6
Page 5Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.940 ac Runoff Depth=0.55"Subcatchment 1S: POST 6
Flow Length=270' Tc=6.0 min CN=61 Runoff=0.79 cfs 0.043 af
Total Runoff Area = 0.940 ac Runoff Volume = 0.043 af Average Runoff Depth = 0.55"
100.00% Pervious Area = 0.940 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 2 YR Rainfall=3.46"POST 6
Page 6Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 6
Runoff = 0.79 cfs @ 11.99 hrs, Volume= 0.043 af, Depth= 0.55"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 2 YR Rainfall=3.46"
Area (ac) CN Description
0.940 61 >75% Grass cover, Good, HSG B
0.940 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.2 108 0.1800 0.43 Sheet Flow, 108' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.8 162 0.0100 1.50 Shallow Concentrated Flow, 162' SHALLOW
Grassed Waterway Kv= 15.0 fps
6.0 270 Total
Subcatchment 1S: POST 6
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Type II 24-hr 2 YR
Rainfall=3.46"
Runoff Area=0.940 ac
Runoff Volume=0.043 af
Runoff Depth=0.55"
Flow Length=270'
Tc=6.0 min
CN=61
0.79 cfs
Type II 24-hr 10 YR Rainfall=4.96"POST 6
Page 7Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.940 ac Runoff Depth=1.35"Subcatchment 1S: POST 6
Flow Length=270' Tc=6.0 min CN=61 Runoff=2.20 cfs 0.105 af
Total Runoff Area = 0.940 ac Runoff Volume = 0.105 af Average Runoff Depth = 1.35"
100.00% Pervious Area = 0.940 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 10 YR Rainfall=4.96"POST 6
Page 8Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 6
Runoff = 2.20 cfs @ 11.98 hrs, Volume= 0.105 af, Depth= 1.35"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 10 YR Rainfall=4.96"
Area (ac) CN Description
0.940 61 >75% Grass cover, Good, HSG B
0.940 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.2 108 0.1800 0.43 Sheet Flow, 108' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.8 162 0.0100 1.50 Shallow Concentrated Flow, 162' SHALLOW
Grassed Waterway Kv= 15.0 fps
6.0 270 Total
Subcatchment 1S: POST 6
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Type II 24-hr 10 YR
Rainfall=4.96"
Runoff Area=0.940 ac
Runoff Volume=0.105 af
Runoff Depth=1.35"
Flow Length=270'
Tc=6.0 min
CN=61
2.20 cfs
Type II 24-hr 100 YR Rainfall=7.26"POST 6
Page 9Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Runoff Area=0.940 ac Runoff Depth=2.89"Subcatchment 1S: POST 6
Flow Length=270' Tc=6.0 min CN=61 Runoff=4.87 cfs 0.226 af
Total Runoff Area = 0.940 ac Runoff Volume = 0.226 af Average Runoff Depth = 2.89"
100.00% Pervious Area = 0.940 ac 0.00% Impervious Area = 0.000 ac
Type II 24-hr 100 YR Rainfall=7.26"POST 6
Page 10Prepared by {enter your company name here}
4/18/2018HydroCAD® 8.00 s/n 004988 © 2006 HydroCAD Software Solutions LLC
Subcatchment 1S: POST 6
Runoff = 4.87 cfs @ 11.98 hrs, Volume= 0.226 af, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs
Type II 24-hr 100 YR Rainfall=7.26"
Area (ac) CN Description
0.940 61 >75% Grass cover, Good, HSG B
0.940 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.2 108 0.1800 0.43 Sheet Flow, 108' SHEET
Grass: Short n= 0.150 P2= 3.46"
1.8 162 0.0100 1.50 Shallow Concentrated Flow, 162' SHALLOW
Grassed Waterway Kv= 15.0 fps
6.0 270 Total
Subcatchment 1S: POST 6
Runoff
Hydrograph
Time (hours)
484644424038363432302826242220181614121086420Flow (cfs)5
4
3
2
1
0
Type II 24-hr 100 YR
Rainfall=7.26"
Runoff Area=0.940 ac
Runoff Volume=0.226 af
Runoff Depth=2.89"
Flow Length=270'
Tc=6.0 min
CN=61
4.87 cfs

Appendix E

Soil Map

Soil Map—Alamance County, North Carolina
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/23/2018
Page 1 of 33995640399569039957403995790399584039958903995640399569039957403995790399584039958903995940651450651500651550651600651650651700651750651800651850651900
651450 651500 651550 651600 651650 651700 651750 651800 651850 651900
36° 5' 46'' N 79° 19' 4'' W36° 5' 46'' N79° 18' 44'' W36° 5' 36'' N
79° 19' 4'' W36° 5' 36'' N
79° 18' 44'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
0 100 200 400 600
Feet
0 30 60 120 180
Meters
Map Scale: 1:2,190 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
1:12,000.
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: Alamance County, North Carolina
Survey Area Data: Version 14, Oct 2, 2017
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Apr 4, 2014—Feb 8,
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—Alamance County, North Carolina
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/23/2018
Page 2 of 3
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
CnB2 Cullen clay loam, 2 to 6
percent slopes, moderately
eroded
9.7 58.5%
CnC2 Cullen clay loam, 6 to 10
percent slopes, moderately
eroded
2.3 13.8%
CnD2 Cullen clay loam, 10 to 15
percent slopes, moderately
eroded
0.1 0.4%
CuB2 Cullen-Urban land complex, 2
to 6 percent slopes,
moderately eroded
2.8 16.7%
EnB Enon sandy loam, 2 to 6
percent slopes
0.8 4.8%
W Water 0.9 5.7%
Totals for Area of Interest 16.5 100.0%
Soil Map—Alamance County, North Carolina
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/23/2018
Page 3 of 3
Soil Map—Alamance County, North Carolina
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/18/2018
Page 1 of 339955603995610399566039957103995760399581039958603995560399561039956603995710399576039958103995860651870651920651970652020652070652120652170652220652270652320652370
651870 651920 651970 652020 652070 652120 652170 652220 652270 652320 652370
36° 5' 44'' N 79° 18' 47'' W36° 5' 44'' N79° 18' 26'' W36° 5' 33'' N
79° 18' 47'' W36° 5' 33'' N
79° 18' 26'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
0 100 200 400 600
Feet
0 35 70 140 210
Meters
Map Scale: 1:2,460 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
1:12,000.
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: Alamance County, North Carolina
Survey Area Data: Version 14, Oct 2, 2017
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Apr 4, 2014—Feb 8,
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—Alamance County, North Carolina
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/18/2018
Page 2 of 3
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
CnD2 Cullen clay loam, 10 to 15
percent slopes, moderately
eroded
0.0 0.0%
EnB Enon sandy loam, 2 to 6
percent slopes
5.4 89.2%
EnC Enon sandy loam, 6 to 10
percent slopes
0.7 10.8%
Totals for Area of Interest 6.0 100.0%
Soil Map—Alamance County, North Carolina
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/18/2018
Page 3 of 3

Appendix F

NC DEQ Storm-EZ Form

Type of application:
Initials
1
2
3
4
Only complete application packages will be accepted and reviewed. A complete package includes all of the items in the checklist
below. Add any comments, and indicate the page or plan sheet number where the following information can be found. Please
indicate that you have provided the following required information by initialing in the space provided next to each item.
Item
5
c. Dimensioned property/project boundary with bearings & distances.
Two sets of sealed, signed, & dated full-sized plans of the entire site at a
readable scale, including:
Part I: Submittal Checklist
Application
New Permit
Notes / Comments
Original and one copy of this application form (all worksheets) and the permit
application fee. For applications submitted to the DEMLR regular permitting
program, the fee is $505 payable to NCDENR. For Express Review, click on the
link below for information and fee schedule. Contact the appropriate regional
office Express Review Coordinator to schedule the required pre-application
meeting.
A USGS map identifying the site location. If the receiving stream is reported as
class SA or the receiving stream drains to and is within 1/2 mile of SA waters,
then include the 1/2 mile radius on the map.
Brooks Distribution Center
Mebane, NC ALAMANCE County
A copy of the most current property deed.
Two copies of additional calculations (as needed). Sealed, signed and dated.
Click here for Express Permitting info
d. The boundaries of all surface waters, regulatory flood zones, and protected
b. Location map with street names and SR numbers, legend, north arrow,
scale.
a. Project name, engineer and firm, revision number and dates.
6
i. Drainage area boundaries (included in the main set of plans, not as a
separate document).
j. Existing and proposed maintenance access routes, utility easements,
drainage easements, public rights-of-way etc.
f. Site layout showing all built-upon areas, drainage features, stormwater
collection systems (inlets, outlets, swales, pipe elevations, slopes and
diameters), and SCMs at ultimate build-out.
g. Existing contours, proposed contours, spot elevations, and finished floor
elevations.
h. Existing drainage (including off-site), drainage easements, pipe sizes,
runoff calculations.
c. A table of elevations, incremental volumes and accumulated volumes (if
applicable).
a. Dimensions, side slopes, length to width ratios and elevations with a
benchmark for clean-out if appropriate.
b. All applicable conveyance devices, including: bypass structure,
pretreatment area, flow distribution device, underdrains, outlet device, outlet
dissipater and level spreader.
Two sets of sealed, signed, & dated full-sized plan details of each SCM (or
typical if appropriate) in both plan view and cross-section at a scale of 1" = 30'
or larger, including:
k. A construction sequence that shows how the SCMs will be protected from
sediment until the entire drainage area is stabilized.
d. Specifications for applicable materials, such as planting media, aggregate,
sod, underdrains, outlet devices, etc.
riparian buffers or a note on the plans that none exist.
e. The boundaries of all vegetated or protected riparian buffers.
STORM-EZ
Version 1.4 Application
4/18/2018
Page 1 of 13
8
9
10
11
12
d. A one-time fertilizer specification to establish plants if necessary.
A copy of the proposed deed restrictions protecting the SCMs and limiting the
built-upon area so that it does not exceed the capacity of the SCM(s) or the high
density threshold (as applicable).
Two sealed, signed, & dated planting plans for each SCM (or typical) at a scale
of 1" = 20' or larger, as applicable, including:
a. The locations of each species and a planting detail.
b. A table summarizing the size, spacing and total quantity of each plant
species that should be used.
A copy of the lease agreement or pending sales agreement if applicable.
NC Dept. of the Secretary of State
A soils report based on field evaluation indicating the SHWT elevations within
the footprints of the proposed SCM(s). Provide a map of the boring locations
with the existing elevations and boring logs. For infiltration SCMs, the report
shall include the soil type, infiltration rate and method for determining the
infiltration rate. Soils information shall be signed and sealed by a licensed soil
scientist.
A copy of the signed and notarized operation and maintenance (O & M)
agreement.
7
For corporations and limited liability corporations (LLC): Documentation from
the NC Secretary of State or other official documentation, which supports the
titles and positions held by the persons listed in the Contact Information section.
The corporation or LLC must be listed as an active corporation in good standing
with the NC Secretary of State, otherwise the application will be returned.
NCDENR Deed Restriction Forms
c. The source nursery for the plants.
STORM-EZ
Version 1.4 Application
4/18/2018
Page 2 of 13
STORM-EZ
Version 1.4 Application
4/18/2018
Page 2 of 13
Date:
Lat:
Zip:Long:
County:
Project Applicant:
Owner / Signing Offical's Name:
Title:
Address:
City:
State:
Zip:
Phone:
Fax:
Email:
Status of applicant:
River Basin:
Receiving Stream(s):
Stream Class(es):
Surface Water Area (ac):Coastal wetland area (ac):
Total property area (ac):Total project area (ac):
Goals/characteristics:NO Volume Matching (LID) NO Drains to an offsite stormwater system
NO Low Density NO Within 575' of Saltwater ORW
NO High Density NO Within 5 miles of a public airport
Briefly summarize how the stormwater runoff will be treated:

Part II: General Project and Applicant Information
Mebane
Project Street Address:
Part III: Permit Information
10.97
-79.315212
Brooks
Directions to Project:
Brooks Distribution Center
36.094728
25.22
Lower Back Creek - Haw River
Brooks
NON-COASTAL
City:
Cape Fear
(from nearest intersection)
(Identify the corporation, organization, property owner, designated
government official, etc. which owns the project .)
27302
Owner
Project Name:18-Apr-18
ALAMANCE
2267 US-70
STORM-EZ
Version 1.4 Application
4/18/2018
Page 3 of 13
Status of construction:
Other permits needed: YES Sedimentation & erosion control 404 Permit / 401 Certification
CAMA Major Permit Isolated Wetlands Permit
Threatened & Endangered Species NPDES Industrial Stormwater Permit
If an application for this project has been previously returned, provide the original project number and previous name of the project:
Provide the permit type, number and issue date for any permits that have already been obtained for this project:

If claiming vested rights, then identify (and attach) the supporting documents and approval dates:
Approval of a site-specific development plan or PUD Approval date:
Valid building permit Issue date:
Other Date:
Not Started
Point of Contact:Phone number:
Part III: Permit Information
Not Started
STORM-EZ
Version 1.4 Application
4/18/2018
Page 3 of 13
Signing Official & Title:
Street address:
Signature: _____________________________________________________________ Date: ____________________________________
I N t P bli f th St t f
on this permit applicant form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved
plans, that the required deed restrictusion and protective covenants will be recorded, and that the proposed project complies with the
requirements of the applicable state stormwater rules and requirements.
Phone number(s):
I, (the Owner & Applicant listed above),
Part VI: Property Owner / Applicant Certification
, certify that the information included
Firm:
City, State, Zip:
Email:
Phone number(s):
Consultant:
(Note: Person/Organization noted above may be contacted for additional project information if applicant
cannot be reached.)
City, State, Zip:
Email:
(Optional) Additional Contact
Person / Orginization:

Part V: Consultant Information
Street address:
Complete this section if you wish to designate authority to another individual or firm so that they may provide information on your
behalf for this project (such as addressing requests for additional information).
Part IV: Additional Contact Information
STORM-EZ
Version 1.4 Application
4/18/2018
Page 4 of 13
I, ___________________________________________, a Notary Public for the State of ___________________________________
County of ______________________________, do hearby certify that __________________________________________________
personally appeared before me this _____ day of ____________________________, ______________,
and acknowledge the due execution of the application for a stormwater permit.
Witness my hand and official seal, _____________________________________________.
My commission expires ______________________________________________________________
Seal
STORM-EZ
Version 1.4 Application
4/18/2018
Page 4 of 13
1.00
1.24
1.70
2.85
3.44
4.95
5.85
6.55
7.27
Highlighted Storm is Design Storm
25.22 acres 6.09 acres
0.00 acres 56%
1.04 acres
Complete the breakdown of impervious area for the project
No
NOTE: Please use the Storm-EZ calculation sheets to document the stormwater design
and create the O&M Agreement.
Discrete SCS Method,
Pre - PostCalculation Method
Entire Site
Stream Class
Receiving Stream name
Basin Information
Lower Back Creek
WS-V, NSW
Use Worksheet Data?
Total Property Area
Total Coastal Wetlands Area
Total Surface Water Area
Depth
(inches)
P90
First Flush / WQV
P90
P95
50-yr, 24-hr
Design Storm:
Burlington
1-yr, 24-hr
Brooks Distribution Center
Mebane, NC ALAMANCE County
Cape Fear River Basin
RAINFALL & CALCULATION DATA
Rainfall Source:
Project County:
Project City:
ALAMANCE
Mebane
Burlington
100-yr, 24-hr
PROJECT INFORMATION
Total Impervious Area
Project % impervious area
ALL AREAS ARE IN SQUARE FEET
2-yr, 24-hr
Storm Event
10-yr, 24-hr
25-yr, 24-hr(Minimum Design Storm = P90 for non-SA, 1-yr, 24-hr for SA)
Loaded Rainfall:
Impervious Surface Area
Offsite Drainage Area (sf)
Stream Index Number
Future (sf)
Off-site (sf)
Existing BUA (sf)
265,360Total
Other On-Site (sf)
15,360
0
On-Site Parking (sf)
On-Site Sidewalks (sf)
On-Site Buildings/Lots (sf)
On-Site Streets (sf)
250,000
Proposed Impervious Area (sf)
% Impervious Area (total)
0
265,360
56%
Total Drainage Area
On-Site Drainage Area (sf)
16-18-(6)
478,049
478,049
,
Entire Site
STORM-EZ
Version 1.4 Project Data
4/18/2018
Page 5 of 13
1 of 1
Pre-Development Land Use:
HSG CN %
B 61 71.50%
B 55 28.50%
Note: Enter BUA Draining to
Permeable Pavement Below
HSG
0.00 0.00%
10.97 0.00%
Existing Permeable Pavement (Infiltration):
Pavement Area Additional BUA
Soil
Infiltratio
n Rate
Gravel Void
Space
Total
Gravel
Depth
Orifice
Dia.
Orifice
Height
(sf)(sf) (in/hr) (%) (in) (in) (in)
100
DSD PAW Dgr
(in) (%)(in)(sf) (acres)
150 1.24 0.00
10.97 acres
0.00 acres
000 acres
D.S.
BMP
Has Synthetic
Liner?
Permeable Pavement + Additional BUA:
Green Roofs :
0
Existing Green Roofs:
HSG
SCM #
Area DS SCM #
0
Description
Land Use Summary:
Description Notes
477,853 10.97
% Imp
Area (sf.)
Area
(ac.)Area (sf.)
Subtotal:
User Defined Drainage Areas:Comp.
CNDescription
Area
7.84Pasture or Open Space 341,676
136,177
Mebane, NC ALAMANCE County
Cape Fear River Basin
PRE-DEVELOPMENT LAND USE CALCULATIONS
Drainage Area #
(sf)Land-use (acres)
3.13Woods
Brooks Distribution Center
Subtotal:
SCM #
From Land Use Tables: 477,853
BUA %
477,853
0.00 acres
0.00 acres
0.00 acres
10.97 acres
Pre-Development SCMs:
Imp. Open
(sf) (sf)
(cf) HSG 0 477853
200
Rainfall Volume =13.60 cf
Natural Infiltration & ET =-13.60 cf
Disconnected Impervious Surfaces =0.00 cf
SCM Infiltration =0.00 cf
Permeable Pavement Infiltration =0.00 cf
Green Roof ET =0.00 cf
Post Filtration Discharge =0.00 cf
Total Runoff Reduction =-13.60 cf
Treated SCM Outflow =0.00 cf
Untreated Surface Runoff =0.00 cf
SCM Type
Green Roofs :0
Downstream
SCM
Total Site Area:
Preserved Coastal Wetlands :
Drainage Area
WQ Volume
Provided
477,853
acre-inches =
Design Storm Runoff Fate Summary:
Runoff Reduction Components:
acre-inches =
49,378acre-inches =
SCM #
Preserved Surface Waters & Non-Coastal Wetlands :
acre-inches =
acre-inches =
acre-inches =
acre-inches =
acre-inches =
acre-inches =
SCM Treatment:
acre-inches =0
The Pre-Development project area contains 0 sf of built upon area, resulting in an overall density of 0%.
0
0
0
-49,378
-49,378
0
0
0
STORM-EZ
Version 1.4 Pre-Development
4/18/2018
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1 of 1
Permeable Pavement:
Infiltration
Rate Void Space
Total
Gravel
Depth
Orifice
Dia.
Orifice
Height
(sf) (acres) (sf) (acres) (in/hr) (%) (in) (in) (in)
500 0.00 0.00
DSD PAW Dgr
(in) (%) (in)(sf)(acres)
600 1.24 0.00 No
Residential Lot CN Calculator (Excluding R/W and dedicated open spaces):
Max Imp / Lot Woods / Lot
(ac.)(sf)(sf)
0.00
Remaining Land Use:
HSG CN (sf) (acres) %
B 98.0 265,360 6.09 55.53%
B 61.0 147,029 3.38 30.77%
B 61.0 65,464 1.50 13.70%
N/A 0 0.00 0.00%
N/A 0 0.00 0.00%
477,853 10.97 100.00%
Land Excluded, or Partially Excluded, from Volume Calculations:(sf.) (ac.)
00.00
00.00
477,853 10.97
Rainfall Volume =13.60 cf
Natural Infiltration & ET =-7.36 cf
Disconnected Impervious Surfaces =0.00 cf
SCM Infiltration =0.00 cf
Area
Open Space / Lot
(sf)
49,378
acre-inches =
0
acre-inches = -26,717
acre-inches =
Area
Runoff Reduction Components:
Design Storm Runoff Fate Summary:
Brooks Distribution Center
Mebane, NC ALAMANCE County
Cape Fear River Basin
Detention
Check
Has
Synthetic
Liner?
Infiltration
Check
POST-DEVELOPMENT LAND USE CALCULATIONS
Pvmt Type
SCM #
0
acre-inches =
Total Site Area:
Surface Waters & Non-Coastal Wetlands :
Green Roofs :
Coastal Wetlands :
Open Space (Managed Open Space)
Lot Area
Impervious
Green Roofs:
# of Lots
Land-Use
Open Space (Managed Open Space)
Permeable Pavement + BUA:
Sub-Total:
HSG
Avg Lot Size
Pavement Area
% Imp.(sf.)
Down-
stream
SCM
Additional BUA
SCM #
Downstream
SCM #
Drainage Area #
Retrofit?Comments
Permeable Pavement Infiltration =0.00 cf
Green Roof ET =0.00 cf
Post Filtration Discharge =0.00 cf
Total Runoff Reduction =-7.36 cf
acre-inches =
0
acre-inches =
acre-inches =
acre-inches =
0
0
-26,717
STORM-EZ
Version 1.4 Post Development
4/18/2018
Page 7 of 13
1 of 1
Brooks Distribution Center
Mebane, NC ALAMANCE County
Cape Fear River Basin
POST-DEVELOPMENT LAND USE CALCULATIONS
Drainage Area #
Treated SCM Outflow =-6.24 cf
Untreated Surface Runoff =0.00 cf
Pre-Development Runoff =0.00 cf
Difference =0.00 cfacre-inches =0
acre-inches =0
The Post-Development project area contains 265360 sf of built upon area, resulting in an overall density of 55.53%.
acre-inches =
acre-inches =-22,661
SCM Treatment:
0
STORM-EZ
Version 1.4 Post Development
4/18/2018
Page 8 of 13
1 of 1
Impervious
(sf)
265,360 (cf) (cf) (cf) (cf) (cf) (cf)
700 CONTECH® Stormfilter B 265,360 100% 26%55000 22661 22661 0 0 22661 41%
Rainfall Volume =13.60 acre-inches =cf
Natural Infiltration & ET =-7.36 acre-inches =cf
Disconnected Impervious Area =0.00 acre-inches =cf
SCM Infiltration =0.00 acre-inches =cf
Permeable Pavement Infiltration =0.00 acre-inches =cf
Green Roof ET =0.00 acre-inches =cf
Post Filtration Discharge =0.00 acre-inches =cf
Total Runoff Reduction =-7.36 acre-inches =cf
SCM Treatment:
Treated SCM Outflow =-6.24 acre-inches =cf
Untreated Surface Runoff =0.00 acre-inches =cf
0.00 acre-inches =cf
0.00 acre-inches =cf
Down-
stream SCM
#
Drainage
Area Inflow
Volume
0
-26,717
0
0
49,378
Pre-Development Runoff =
-22,661
0
100% of total
impervious
area.
26% of total
pervious
area.
Runoff Reduction Components:
-26,717
265360 sf impervious area entered
compared to 265360 sf total impervious.
0
Design Storm Runoff Fate Summary:
The Post-Development project area contains 265360 sf of built upon area, resulting in an overall density of 55.53%.
0
0
**BASIC TREATMENT MET**
Difference =
0 cf of runoff generated by pervious areas. Net untreated runoff = 0 cf. Net 100% of impervious area routed through SCMs.
0
55019 sf open space entered
compared to 212493 sf total
open space.
Pervious
(sf)
212,493
Brooks Distribution Center
Mebane, NC ALAMANCE County
Cape Fear River Basin
Enter only runoff volume below that will be infiltrated or drawn down over 2 to 5 days. Additional volume provided in devices should not be entered in this worksheet.
Drawdown time requirement applies to all storm events.
Drainage Area #
PROPOSED SIPs & STRUCTURAL RUNOFF VOLUME CONTROLS
Offsite Impervious
Area Treated
Infiltration &
ET
0 sf
Total
Inflow
Volume
55,019
% of Total
Impervious
Area
% of Total
Pervious
Area
Storage
Volume
Name / Location
Contributing Area
HSG
STORMWATER CONTROL MEASURES
% of SCM
Volume
Utilized
Post
Filtration
Outflow
Treated
Outflow
Type of Device
SCM
#
Warnings:
ppj p , g y
Note: Large storage devices such as wet/dry detention ponds, constructed wetlands, or infiltration basins may require pond routing calculations. The routing calculations should be provided in addition to this spreadsheet.
STORM-EZ
Version 1.4 Stormwater Controls
4/18/2018
Page 9 of 13
1 of 1
P90 Storm - Rainfall Depth = 1.24 inches
Mebane, NC ALAMANCE County
Cape Fear River Basin
P90
Brooks Distribution Center
Compliance Storm = P90 Storm - Rainfall Depth = 1.24 inches
Drainage Area #
FATE OF RAINFALL
Select Storm:
VOLUME MATCHING SCALE
Volume Matching Threshold
Basic Treatment Threshold
BASIC TREATMENT SCALE
30%
40%
50%
60%
70%
80%
90%
100%% of Total Rainfall VolumePost Development Fates
30%
40%
50%
60%
70%
80%
90%
100%% of Total Rainfall VolumePre Development Fates
FATE OF RAINFALL GRAPHS
The"Fate of Rainfall" charts display the hydrologic processes to which rainfall volumes are subjected based on the combinations of land use, soil type, and stormwater controls entered by the user. The charts are designed to display the stormwater
plan in a form which illustrates changes to the hydrologic cycle which result from urbanization and various stormwater management strategies.
0%
10%
20%
30%
Infiltration and ET ‐ 26717 cf Treated Outflow from BMPs ‐ 22661 cf Untreated Surface Runoff ‐ 0 cf
Post Filtration Outflow ‐ 0 cf
Other
Infiltration by BMPs ‐ 0 cf
Permeable Pavement Infiltration ‐ 0 cf
Disconnected Impervious Infiltration ‐ 0 cf
Green Roof Evapotranspiration ‐ 0 cf
0%
10%
20%
30%
Infiltration and ET ‐ 49378 cf Treated Outflow from BMPs ‐ 0 cf Untreated Surface Runoff ‐ 0 cf
Post Filtration Outflow ‐ 0 cf Other
Infiltration by BMPs ‐ 0 cf Permeable Pavement Infiltration ‐ 0 cf
Disconnected Impervious Infiltration ‐ 0 cf Green Roof Evapotranspiration ‐ 0 cf
Infiltration and ET ‐ 49378 cf
STORM-EZ
Version 1.4 Rainfall Fate Graph
4/18/2018
Page 10 of 13
1 of 1
TIME OF CONCENTRATION CALCULATIONS:
Pre-Development
Length (ft) Slope (ft/ft)Tt (hrs)
Length (ft) Slope (ft/ft) n-value
Flow Area
(ft2)Tt (hrs)
Channel Flow:
Channel Flow:
Pre-development Tc =5.00 min (Minimum 5 minutes)
Post Development
Length (ft) Slope (ft/ft)Tt (hrs)
Length (ft) Slope (ft/ft) n-value
Flow Area
(ft2)Tt (hrs)
Channel Flow:
Channel Flow:
Post-development T =500 min (Minimum 5 minutes)
Cape Fear River Basin
ADDITIONAL CALCULATIONS
Brooks Distribution Center
Mebane, NC ALAMANCE County
Shallow Flow:
Drainage Area #
Surface Cover
Wetted Perimeter (ft)
Sheet Flow:
Surface Cover
Wetted Perimeter (ft)
Sheet Flow:
Shallow Flow:
Sheet Flow:
Shallow Flow:
Sheet Flow:
Shallow Flow:
Post-development Tc =5.00 min (Minimum 5 minutes)
ADJUSTED CURVE NUMBER CALCULATIONS:
Pre-Development
F.F. P90 P95 1-Yr 2-Yr 10-Yr 25-Yr 50-Yr 100-Yr
Rainfall (in) = 1.00 1.24 1.70 2.85 3.44 4.95 5.85 6.55 7.27
Q*(in) =0.00 0.00 0.01 0.26 0.48 1.23 1.77 2.23 2.73
CNadj =67 62 59 59 59 59 59 59 59
Post Development
F.F. P90 P95 1-Yr 2-Yr 10-Yr 25-Yr 50-Yr 100-Yr
Rainfall (in) = 1.00 1.24 1.70 2.85 3.44 4.95 5.85 6.55 7.27
Q*(in) =0.00 0.00 0.01 0.21 0.64 1.83 2.58 3.18 3.81
CNadj =67 62 58 57 63 68 69 69 70
PEAK FLOW CALCULATIONS:
F.F. P90 P95 1-Yr 2-Yr 10-Yr 25-Yr 50-Yr 100-Yr
Pre-Development
Q* (in)0.00 0.00 0.01 0.26 0.48 1.23 1.77 2.23 2.73
qu (csm/in)385.00 385.00 385.00 385.00 666.59 931.69 931.69 931.69 1165.98
Q (cfs) 0.00 0.00 0.10 1.73 5.47 19.57 28.23 35.55 54.47
Post Development
Q* (in)0.00 0.00 0.01 0.21 0.64 1.83 2.58 3.18 3.81
qu (csm/in)385.00 385.00 385.00 385.00 809.52 1165.98 1165.98 1165.98 1165.98
Q (cfs) 0.00 0.00 0.06 1.39 8.91 36.61 51.62 63.61 76.18
N/A N/A -40.0% -19.7% 63.0% 87.0% 82.9% 78.9% 39.9%
Analysis Area = 10.97 Acres (0.017 sq. miles)
**Note: To decrease Post-development peak flows - increase storage volume being drawdown or infiltrated or lengthen post-
Analysis Area = 10.97 Acres (0.017 sq. miles)
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development time of concentration. See LID HELP for more information.
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The BMP(s) on this project include (check all that apply & corresponding O&M tables will be added automatically):
Quantity:Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Quantity: Location(s):
Present: No Location(s):
Present: No Location(s):
Maintenance records shall be kept on the following BMP(s). This maintenance record shall be kept in a log in a known set location.
Any deficient BMP elements noted in the inspection will be corrected, repaired, or replaced immediately. These deficiencies can
affect the integrity of structures, safety of the public, and the pollutant removal efficiency of the BMP(s).
Bioretention Cell
Dry Detention Basin
Cover Page
Level Spreader/VFS
Grassed Swale
Infiltration Basin
Infiltration Trench
Green Roof
Soil Amendments
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for
each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any changes to
the system or responsible party.
Stormwater Wetland
Wet Detention Basin
Disconnected Impervious Area
Permeable Pavement
Proprietary System
Rainwater Harvesting
Sand Filter
Operation & Maintenance Agreement
Brooks Distribution Center
Mebane, NC ALAMANCE County
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Version 1.4 O&M Manual
4/18/2018
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I,, a Notary Public for the State of
County of , do hearby certify that
personally appeared before me this day of and
acknowledge the due execution of the Operations and Maintenance Agreement .
Witness my hand and official seal, _____________________________________________.
Seal My commission expires
Phone number(s):
Email:
Signature:
Street address:
City, state, zip:
* Responsible Party:
Title & Organization:
Date:
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Version 1.4 O&M Manual
4/18/2018
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