J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 45 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 19P: SD-21 Inflow Area = 0.567 ac, 17.46% Impervious, Inflow Depth > 0.42" for WQ event Inflow = 0.12 cfs @ 1.80 hrs, Volume= 0.020 af Outflow = 0.12 cfs @ 1.80 hrs, Volume= 0.020 af, Atten= 0%, Lag= 0.1 min Primary = 0.12 cfs @ 1.80 hrs, Volume= 0.020 af Routed to Pond 18P : SD-22 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 590.78' @ 1.80 hrs Surf.Area= 0.000 ac Storage= 0.000 af Plug-Flow detention time= 0.0 min calculated for 0.020 af (100% of inflow) Center-of-Mass det. time= 0.0 min ( 151.7 - 151.6 ) Volume #1 Device #1 Invert 590.61' Avail.Storage 0.001 af Routing Primary Invert 590.61' Storage Description 12.0" Round SD-21 L= 64.5' S= 0.0150 '/' Outlet Devices 12.0" Vert. SD-21 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.12 cfs @ 1.80 hrs HW=590.78' TW=588.69' (Dynamic Tailwater) 1=SD-21 (Orifice Controls 0.12 cfs @ 1.41 fps) Pond 19P: SD-21 Hydrograph Inflow Primary 0.12 cfs 0.13 Inflow Area=0.567 ac Peak Elev=590.78' Storage=0.000 af 0.12 cfs 0.12 0.11 0.1 Flow (cfs) 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 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