J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1) 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 7 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 24S: PO-DA 7 Runoff = 2.66 cfs @ 12.20 hrs, Volume= Routed to Pond 22P : O-1 0.239 af, Depth> 1.70" 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) 4,346 29,340 22,892 16,829 73,407 69,061 4,346 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 94.08% Pervious Area 5.92% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.7 49 0.0791 0.12 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.45" 1.9 151 0.0071 1.36 Shallow Concentrated Flow, Shallow Concentrated Flow Unpaved Kv= 16.1 fps 3.5 239 0.0260 1.13 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 12.1 439 Total