J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-AquaShield) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 42 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 15S: PO-DA M Runoff = 2.37 cfs @ 12.14 hrs, Volume= Routed to Pond 4P : AquaShield 0.202 af, Depth> 5.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" Area (sf) 13,651 4,808 18,459 4,808 13,651 * CN 98 85 Description Impervious, Pavement, HSG D Yard Stone/Gravel Pad, HSG D Weighted Average 26.05% Pervious Area 73.95% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.9 100 0.0160 0.24 Sheet Flow, Gravel Sheet Flow n= 0.100 P2= 4.07" 0.5 80 0.0160 2.57 Shallow Concentrated Flow, Gravel Shallow Concentrated Flow Paved Kv= 20.3 fps 7.4 180 Total Subcatchment 15S: PO-DA M Hydrograph Runoff 2.37 cfs NOAA 24-hr D 10-Year_Future Rainfall=6.36" P2=4.07" Runoff Area=18,459 sf Runoff Volume=0.202 af Runoff Depth>5.73" Flow Length=180' Slope=0.0160 '/' Tc=7.4 min CN=WQ Flow (cfs) 2 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24