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 43 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 18P: SD-22 Inflow Area = 0.917 ac, 22.90% Impervious, Inflow Depth > 0.45" for WQ event Inflow = 0.23 cfs @ 1.70 hrs, Volume= 0.035 af Outflow = 0.23 cfs @ 1.70 hrs, Volume= 0.035 af, Atten= 0%, Lag= 0.1 min Primary = 0.23 cfs @ 1.70 hrs, Volume= 0.035 af Routed to Pond 17P : SD-23 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 588.69' @ 1.70 hrs Surf.Area= 0.000 ac Storage= 0.000 af Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 0.1 min ( 146.6 - 146.6 ) Volume #1 Device #1 Invert 588.45' Avail.Storage 0.002 af Routing Primary Invert 588.45' Storage Description 12.0" Round SD-22 L= 127.3' S= 0.0150 '/' Outlet Devices 12.0" Vert. SD-22 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.23 cfs @ 1.70 hrs HW=588.69' TW=587.06' (Dynamic Tailwater) 1=SD-22 (Orifice Controls 0.23 cfs @ 1.65 fps) Pond 18P: SD-22 Hydrograph 0.26 Inflow Primary 0.23 cfs Inflow Area=0.917 ac Peak Elev=588.69' Storage=0.000 af 0.23 cfs 0.24 0.22 0.2 0.18 Flow (cfs) 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 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