J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-2) West Orange HydroCAD_Post NOAA 24-hr D 2-Year_Current Rainfall=3.45", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 13 Summary for Subcatchment 16S: PO-DA N Runoff = 2.06 cfs @ 12.19 hrs, Volume= Routed to Pond 25P : O-2 0.188 af, Depth> 1.71" 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) 9,148 18,644 6,665 23,000 57,457 48,309 9,148 CN 98 80 85 73 Description Impervious, Pavement, HSG D >75% Grass cover, Good, HSG D Yard Stone/Gravel Pad, HSG D Brush, Good, HSG D Weighted Average 84.08% Pervious Area 15.92% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.9 100 0.0139 0.21 Sheet Flow, Gravel Sheet Flow n= 0.100 P2= 3.45" 0.1 19 0.0480 3.53 Shallow Concentrated Flow, Shallow Concentrated Flow Unpaved Kv= 16.1 fps 0.2 28 0.2178 2.33 Shallow Concentrated Flow, Shallow Concentrated Flow Woodland Kv= 5.0 fps 3.4 305 0.0468 1.51 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 11.6 452 Total