HomeMy WebLinkAbout22SITE5 Stormwater Calcs Appendix B REVAppendix B
Supporting Stormwater Calculations
Hydraulic Analysis Report
Project Data Project Title: Depot Road Designer: DCM Project Date: Thursday, June 16, 2022 Project Units: U.S. Customary Units Notes:
Rational Analysis: Bench West Subarea1 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.51 Basin Area: 0.5900 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 2.2 cfs
Rational Analysis: Swale West Subarea2 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.66 Basin Area: 1.0500 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 5.1 cfs
Rational Analysis: Swale West Subarea3 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.78 Basin Area: 1.4100 acres
Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 8.1 cfs
Rational Analysis: Gutter West Subarea4 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 1.8700 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr
10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 13.0 cfs
Rational Analysis: Basins West Subarea4S Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.9700 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 6.7 cfs
Rational Analysis: Basins West Subarea5 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.75 Basin Area: 1.4000 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.04 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 7.7 cfs
Rational Analysis: West Overall Notes:
Rational Method Input Parameters Runoff Coefficient: 0.81 Basin Area: 6.3200 acres Rainfall Intensity: 5.57 in/hr Time of Concentration: 8.50 minutes
Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 8.50 min
Rational Method Results Flowrate: 28.7 cfs
Rational Analysis: Swale North Subarea1 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.5200 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr
10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 3.6 cfs
Rational Analysis: Swale North Subarea2 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 1.2200 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 8.5 cfs
Rational Analysis: Swale North Subarea3 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.2300 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 1.6 cfs
Rational Analysis: Swale North Subarea4 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.6200 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes
Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 4.3 cfs
Rational Analysis: Swale North Overall Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 2.5900 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr
10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 18.0 cfs
Rational Analysis: CB E Subarea Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.2100 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 1.5 cfs
Rational Analysis: Swale Middle Subarea1 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.9100 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 6.3 cfs
Rational Analysis: Swale Middle Subarea2 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.9900 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes
Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 6.9 cfs
Rational Analysis: Swale Middle Subarea3 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 1.2900 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr
10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 9.0 cfs
Rational Analysis: Swale Middle Subarea4 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 1.3900 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 9.7 cfs
Rational Analysis: Swale Middle Overall Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 4.5800 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 31.9 cfs
Rational Analysis: CB F Subarea Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.1800 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes
Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 1.3 cfs
Rational Analysis: CB G Subarea Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.0800 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr
10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 0.6 cfs
Rational Analysis: Swale South Subarea1 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.8600 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 6.0 cfs
Rational Analysis: Swale South Subarea2 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 1.2600 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 8.8 cfs
Rational Analysis: Swale South Subarea3 Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.8100 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes
Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 5.6 cfs
Rational Analysis: Swale South Overall Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 2.9300 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr
10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 20.4 cfs
Rational Analysis: Pipe Inlet Subarea Notes:
Rational Method Input Parameters Runoff Coefficient: 0.95 Basin Area: 0.6900 acres Rainfall Intensity: 7.26 in/hr Time of Concentration: 5.00 minutes Recurrence Year: 10 year
IDF Input Parameters User Supplied Data 10 year Recurrence, 5 min duration: 7.26 in/hr 10 year Recurrence, 10 min duration: 5.14 in/hr 10 year Recurrence, 15 min duration: 4.03 in/hr 10 year Recurrence, 30 min duration: 2.84 in/hr 10 year Recurrence, 60 min duration: 1.84 in/hr
Time of Concentration Input Parameters Specified Time of Concentration Time of Concentration: 5.00 min
Rational Method Results Flowrate: 4.8 cfs
Channel Analysis: Stockpile Yard Perimeter Swales Notes:
Input Parameters Channel Type: Trapezoidal Side Slope 1 (Z1): 2.0000 ft/ft Side Slope 2 (Z2): 2.0000 ft/ft Channel Width 4.00 ft Longitudinal Slope: 0.0100 ft/ft Manning's n: 0.0300 Flow 8.3000 cfs
Result Parameters Depth 0.5629 ft Area of Flow 2.8852 ft^2 Wetted Perimeter 6.5173 ft Hydraulic Radius 0.4427 ft Average Velocity 2.8768 ft/s Top Width 6.2515 ft Froude Number: 0.7463 Critical Depth 0.4707 ft Critical Velocity 3.5683 ft/s Critical Slope: 0.0188 ft/ft Critical Top Width 5.88 ft Calculated Max Shear Stress 0.3512 lb/ft^2 Calculated Avg Shear Stress 0.2762 lb/ft^2
Channel Analysis: Salt Storage Perimeter Swale Notes:
Input Parameters Channel Type: Trapezoidal Side Slope 1 (Z1): 2.0000 ft/ft Side Slope 2 (Z2): 2.0000 ft/ft Channel Width 5.00 ft Longitudinal Slope: 0.0100 ft/ft Manning's n: 0.0300 Flow 8.0000 cfs
Result Parameters Depth 0.4908 ft Area of Flow 2.9359 ft^2 Wetted Perimeter 7.1950 ft Hydraulic Radius 0.4080 ft Average Velocity 2.7249 ft/s Top Width 6.9632 ft Froude Number: 0.7395 Critical Depth 0.4063 ft Critical Velocity 3.3879 ft/s Critical Slope: 0.0192 ft/ft Critical Top Width 6.63 ft Calculated Max Shear Stress 0.3063 lb/ft^2 Calculated Avg Shear Stress 0.2546 lb/ft^2
Channel Analysis: Salt Storage Perimeter Swale Notes:
Input Parameters Channel Type: Trapezoidal Side Slope 1 (Z1): 2.0000 ft/ft
Side Slope 2 (Z2): 2.0000 ft/ft Channel Width 5.00 ft Longitudinal Slope: 0.0100 ft/ft Manning's n: 0.0300 Flow 8.1000 cfs
Result Parameters Depth 0.4943 ft Area of Flow 2.9603 ft^2 Wetted Perimeter 7.2107 ft Hydraulic Radius 0.4105 ft Average Velocity 2.7362 ft/s Top Width 6.9773 ft Froude Number: 0.7403 Critical Depth 0.4094 ft Critical Velocity 3.3999 ft/s Critical Slope: 0.0192 ft/ft Critical Top Width 6.64 ft Calculated Max Shear Stress 0.3085 lb/ft^2 Calculated Avg Shear Stress 0.2562 lb/ft^2
Channel Analysis: Reverse Bench Notes:
Input Parameters Channel Type: Triangular Side Slope 1 (Z1): 2.0000 ft/ft Side Slope 2 (Z2): 5.0000 ft/ft Longitudinal Slope: 0.0200 ft/ft
Manning's n: 0.0250 Flow 2.2000 cfs
Result Parameters Depth 0.4550 ft Area of Flow 0.7245 ft^2 Wetted Perimeter 3.3373 ft Hydraulic Radius 0.2171 ft Average Velocity 3.0364 ft/s Top Width 3.1849 ft Froude Number: 1.1219 Critical Depth 0.4961 ft Critical Velocity 2.5536 ft/s Critical Slope: 0.0126 ft/ft Critical Top Width 4.25 ft Calculated Max Shear Stress 0.5678 lb/ft^2 Calculated Avg Shear Stress 0.2709 lb/ft^2
Channel Analysis: Stockpile Yard Perimeter Swales Notes:
Input Parameters Channel Type: Trapezoidal Side Slope 1 (Z1): 2.0000 ft/ft Side Slope 2 (Z2): 2.0000 ft/ft Channel Width 4.00 ft Longitudinal Slope: 0.0100 ft/ft Manning's n: 0.0300 Flow 9.7000 cfs
Result Parameters Depth 0.6143 ft Area of Flow 3.2121 ft^2 Wetted Perimeter 6.7474 ft Hydraulic Radius 0.4761 ft Average Velocity 3.0198 ft/s Top Width 6.4573 ft Froude Number: 0.7545 Critical Depth 0.5179 ft Critical Velocity 3.7192 ft/s Critical Slope: 0.0183 ft/ft Critical Top Width 6.07 ft Calculated Max Shear Stress 0.3833 lb/ft^2 Calculated Avg Shear Stress 0.2971 lb/ft^2
Appendix B
Pipe Sizing Calculations
Manning's Equation for Open Channel Flow
Maximum pipe capacities for the trunk line drains are presented below as compared to the peak
flow rates calculated using the Rational Method for the contributing watersheds.
Pipes are sized with capacity for the 10-year design storm minimum in accordance with the
recommendations of the CT DOT Drainage Manual for curb and gutter systems.
Existing Outlet for West Side of Tracks (24-inch CI at S=0.026)Design Flow - West Overall
Q=36.58 CFS Flow Rate Q10=28.7 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.026 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
HDS A to Existing 24-inch CI (24-inch HDPE at S=0.017)Design Flow - West Overall
Q=29.58 CFS Flow Rate Q10=28.7 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.017 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
CB A to HDS A (18-inch HDPE at S = 0.020)Design Flow - West Subarea 5
Q=14.90 CFS Flow Rate Q10=7.7 CFS
n=0.013 Roughness Coefficient
A=1.77 SF Area of Pipe
R=0.375 FT Hydraulic Radius = A/P
S=0.02 FT/FT Pipe Slope
r=0.75 FT Pipe Radius
P=4.71 FT Pipe Perimeter
CB B to CB A (18-inch HDPE at S = 0.005)Design Flow - West Subarea 5
Q=7.45 CFS Flow Rate Q10=7.7 CFS
n=0.013 Roughness Coefficient
A=1.77 SF Area of Pipe
R=0.375 FT Hydraulic Radius = A/P
S=0.005 FT/FT Pipe Slope
r=0.75 FT Pipe Radius
P=4.71 FT Pipe Perimeter
213249.1 SARnQ=
Pipe Sizing Calculations (Revised 6/16/22)
Page 1 of 7
Appendix B
Pipe Sizing Calculations
CB C to HDS A (24-inch HDPE at S = 0.065)Design Flow - West Subarea 1-4
Q=57.83 CFS Flow Rate Q10=28.4 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.065 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
CB D to CB C (24-inch HDPE at S = 0.005)Design Flow - West Subarea 3+4S
Q=16.04 CFS Flow Rate Q10=14.8 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.005 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
North Swale to CB C (15-inch HDPE at S = 0.062)Design Flow - West Subarea 1+2
Q=16.13 CFS Flow Rate Q10=7.3 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.062 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
South Swale to CB C (15-inch HDPE at S = 0.020)Design Flow - West Subarea 3
Q=9.16 CFS Flow Rate Q10=8.1 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.02 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
CB E to Outlet (15-inch HDPE at S = 0.005)Design Flow - CB-E Subarea
Q=4.58 CFS Flow Rate Q10=1.5 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.005 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
Pipe Sizing Calculations (Revised 6/16/22)
Page 2 of 7
Appendix B
Pipe Sizing Calculations
CB F to Outlet (15-inch HDPE at S = 0.020)Design Flow - CB-F/G Subarea
Q=9.16 CFS Flow Rate Q10=1.9 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.02 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
CB G to CB F (15-inch HDPE at S = 0.005)Design Flow - CB-G Subarea
Q=4.58 CFS Flow Rate Q10=0.6 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.005 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
Pipe Inlet to HDS B (18-inch RCP at S = 0.003)Design Flow - Pipe Inlet Subarea
Q=5.77 CFS Flow Rate Q10=4.8 CFS
n=0.013 Roughness Coefficient
A=1.77 SF Area of Pipe
R=0.375 FT Hydraulic Radius = A/P
S=0.003 FT/FT Pipe Slope
r=0.75 FT Pipe Radius
P=4.71 FT Pipe Perimeter
HDS B to DMH (18-inch RCP at S = 0.003)Design Flow - Pipe Inlet Subarea
Q=5.77 CFS Flow Rate Q10=4.8 CFS
n=0.013 Roughness Coefficient
A=1.77 SF Area of Pipe
R=0.375 FT Hydraulic Radius = A/P
S=0.003 FT/FT Pipe Slope
r=0.75 FT Pipe Radius
P=4.71 FT Pipe Perimeter
DMH to Outlet (Existing 24-inch CI at S = 0.024)Design Flow - Pipe Inlet + South
Q=35.14 CFS Flow Rate Q10=25.1 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.024 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
Pipe Sizing Calculations (Revised 6/16/22)
Page 3 of 7
Appendix B
Pipe Sizing Calculations
HDS 1 to Outlet (18-inch HDPE at S = 0.03)Design Flow - North 1-4
Q=18.24 CFS Flow Rate Q10=18 CFS
n=0.013 Roughness Coefficient
A=1.77 SF Area of Pipe
R=0.375 FT Hydraulic Radius = A/P
S=0.03 FT/FT Pipe Slope
r=0.75 FT Pipe Radius
P=4.71 FT Pipe Perimeter
CB 1 to HDS 1 (18-inch HDPE at S = 0.03)Design Flow - North 1-4
Q=18.24 CFS Flow Rate Q10=18 CFS
n=0.013 Roughness Coefficient
A=1.77 SF Area of Pipe
R=0.375 FT Hydraulic Radius = A/P
S=0.03 FT/FT Pipe Slope
r=0.75 FT Pipe Radius
P=4.71 FT Pipe Perimeter
CB 2 to CB 1 (15-inch HDPE at S = 0.005)Design Flow - North 1
Q=4.58 CFS Flow Rate Q10=3.6 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.005 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
CB 3 to CB 1 (15-inch HDPE at S = 0.009)Design Flow - North 3-4
Q=6.14 CFS Flow Rate Q10=5.9 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.009 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
CB 4 to CB 3 (15-inch HDPE at S = 0.005)Design Flow - North4
Q=4.58 CFS Flow Rate Q10=4.3 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.005 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
Pipe Sizing Calculations (Revised 6/16/22)
Page 4 of 7
Appendix B
Pipe Sizing Calculations
CB 5 to CB 4 (15-inch HDPE at S = 0.005)Design Flow - North4
Q=4.58 CFS Flow Rate Q10=4.3 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.005 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
CB 6 to CB 5 (15-inch HDPE at S = 0.005)Design Flow - North4
Q=4.58 CFS Flow Rate Q10=4.3 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.005 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
HDS 2 to DMH (24-inch HDPE at S = 0.020)Design Flow - Middle 1-4
Q=32.08 CFS Flow Rate Q10=31.9 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.02 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
CB 7 to HDS 2 (24-inch HDPE at S = 0.020)Design Flow - Middle 1-4
Q=32.08 CFS Flow Rate Q10=31.9 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.02 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
CB 8 to CB 7 (18-inch HDPE at S = 0.016)Design Flow - Middle 1-2
Q=13.32 CFS Flow Rate Q10=13.2 CFS
n=0.013 Roughness Coefficient
A=1.77 SF Area of Pipe
R=0.375 FT Hydraulic Radius = A/P
S=0.016 FT/FT Pipe Slope
r=0.75 FT Pipe Radius
P=4.71 FT Pipe Perimeter
Pipe Sizing Calculations (Revised 6/16/22)
Page 5 of 7
Appendix B
Pipe Sizing Calculations
CB 9 to CB 8 (15-inch HDPE at S = 0.056)Design Flow - Middle 1
Q=15.33 CFS Flow Rate Q10=6.3 CFS
n=0.013 Roughness Coefficient
A=1.23 SF Area of Pipe
R=0.3125 FT Hydraulic Radius = A/P
S=0.056 FT/FT Pipe Slope
r=0.625 FT Pipe Radius
P=3.93 FT Pipe Perimeter
CB 10 to CB 7 (18-inch HDPE at S = 0.013)Design Flow - Middle 4
Q=12.01 CFS Flow Rate Q10=9.7 CFS
n=0.013 Roughness Coefficient
A=1.77 SF Area of Pipe
R=0.375 FT Hydraulic Radius = A/P
S=0.013 FT/FT Pipe Slope
r=0.75 FT Pipe Radius
P=4.71 FT Pipe Perimeter
HDS 3 to Existing CB (24-inch HDPE at S = 0.010)Design Flow - South 1-3
Q=22.68 CFS Flow Rate Q10=20.4 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.01 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
CB 11 to HDS 3 (24-inch HDPE at S = 0.010)Design Flow - South 1-3
Q=22.68 CFS Flow Rate Q10=20.4 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.01 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
CB 12 to CB 11 (24-inch HDPE at S = 0.011)Design Flow - South 1-2
Q=23.79 CFS Flow Rate Q10=14.8 CFS
n=0.013 Roughness Coefficient
A=3.14 SF Area of Pipe
R=0.5 FT Hydraulic Radius = A/P
S=0.011 FT/FT Pipe Slope
r=1 FT Pipe Radius
P=6.28 FT Pipe Perimeter
Pipe Sizing Calculations (Revised 6/16/22)
Page 6 of 7
Appendix B
Pipe Sizing Calculations
CB 13 to CB 12 (18-inch HDPE at S = 0.005)Design Flow - South 1
Q=7.45 CFS Flow Rate Q10=6 CFS
n=0.013 Roughness Coefficient
A=1.77 SF Area of Pipe
R=0.375 FT Hydraulic Radius = A/P
S=0.005 FT/FT Pipe Slope
r=0.75 FT Pipe Radius
P=4.71 FT Pipe Perimeter
Pipe Sizing Calculations (Revised 6/16/22)
Page 7 of 7