J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-AquaShield) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 55 Summary for Subcatchment 3S: PO-DA A Runoff = 12.98 cfs @ 12.25 hrs, Volume= Routed to Pond 4P : AquaShield 1.415 af, Depth> 9.45" 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 100-Year_Future Rainfall=11.58", P2=4.07" * Area (sf) 9,878 14,245 39,395 14,769 78,287 68,409 9,878 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 87.38% Pervious Area 12.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 100 0.0543 0.13 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 4.07" 0.7 67 0.0540 1.63 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.1 43 0.2810 8.53 Shallow Concentrated Flow, Gravel Shallow Concentrated Flow Unpaved Kv= 16.1 fps 3.5 281 0.0069 1.34 Shallow Concentrated Flow, Gravel Shallow Concentrated Flow Unpaved Kv= 16.1 fps 17.1 491 Total