J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-AquaShield) West Orange HydroCAD_Pre NOAA 24-hr D 2-Year_Current Rainfall=3.45", P2=3.45" Prepared by Burns & McDonnell Printed 5/13/2024 Page 10 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 23S: PO-DA 8 Runoff = 1.07 cfs @ 12.15 hrs, Volume= Routed to Pond 20P : O-AquaShield 0.091 af, Depth> 2.83" 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 2-Year_Current Rainfall=3.45", P2=3.45" Area (sf) 11,671 5,115 16,786 5,115 11,671 * CN 98 85 Description Impervious, Pavement, HSG D Yard Stone/Gravel Pad, HSG D Weighted Average 30.47% Pervious Area 69.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.5 100 0.0160 0.22 Sheet Flow, Gravel Sheet Flow n= 0.100 P2= 3.45" 0.6 78 0.0165 2.07 Shallow Concentrated Flow, Shallow Concentrated Flow Unpaved Kv= 16.1 fps 8.1 178 Total Subcatchment 23S: PO-DA 8 Hydrograph Runoff 1.07 cfs NOAA 24-hr D 2-Year_Current Rainfall=3.45" P2=3.45" Runoff Area=16,786 sf Runoff Volume=0.091 af Runoff Depth>2.83" Flow Length=178' Tc=8.1 min CN=WQ Flow (cfs) 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