J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 129 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: PO-DA C Runoff = 1.67 cfs @ 12.27 hrs, Volume= Routed to Pond 1P : BR-01 0.184 af, Depth> 3.90" 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_Current Rainfall=5.37", P2=3.45" Area (sf) 4,312 2,396 17,990 24,698 20,386 4,312 * CN 98 80 85 Description Impervious, Pavement, HSG D >75% Grass cover, Good, HSG D Yard Stone/Gravel Pad, HSG D Weighted Average 82.54% Pervious Area 17.46% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.9 100 0.0018 0.09 Sheet Flow, Gravel Sheet Flow n= 0.100 P2= 3.45" 0.6 64 0.0106 1.66 Shallow Concentrated Flow, Shallow Concentrated Flow Unpaved Kv= 16.1 fps 18.5 164 Total Subcatchment 5S: PO-DA C Hydrograph Runoff Flow (cfs) 1.67 cfs NOAA 24-hr D 10-Year_Current Rainfall=5.37" P2=3.45" Runoff Area=24,698 sf Runoff Volume=0.184 af Runoff Depth>3.90" Flow Length=164' Tc=18.5 min CN=WQ 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