J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) West Orange HydroCAD_Post NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 36 Summary for Pond 13P: SD-25, SD-26 Inflow Area = 1.863 ac, 27.41% Impervious, Inflow Depth > 0.48" for WQ event Inflow = 0.48 cfs @ 1.68 hrs, Volume= 0.074 af Outflow = 0.48 cfs @ 1.68 hrs, Volume= 0.074 af, Atten= 0%, Lag= 0.0 min Primary = 0.48 cfs @ 1.68 hrs, Volume= 0.074 af Routed to Pond 8P : O-1B Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 580.74' @ 1.68 hrs Surf.Area= 0.000 ac Storage= 0.000 af Plug-Flow detention time= 0.1 min calculated for 0.074 af (100% of inflow) Center-of-Mass det. time= 0.0 min ( 154.8 - 154.8 ) Volume #1 Device #1 Invert 580.69' Routing Primary Avail.Storage 0.007 af Invert 580.44' Storage Description 15.0" Round SD-25 L= 262.4' S= 0.0150 '/' Outlet Devices 18.0" Round SD-26 L= 29.4' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 580.44' / 580.15' S= 0.0099 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.77 sf Primary OutFlow Max=0.48 cfs @ 1.68 hrs HW=580.74' TW=0.00' (Dynamic Tailwater) 1=SD-26 (Inlet Controls 0.48 cfs @ 1.88 fps)