J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 84 Summary for Pond 15P: Yard Area Ponding [57] Hint: Peaked at 599.04' (Flood elevation advised) [62] Hint: Exceeded Reach 15R OUTLET depth by 2.60' @ 1.35 hrs Inflow Area = Inflow = Outflow = Primary = Secondary = 6.124 ac, 27.47% Impervious, Inflow Depth = 0.44" for NJDEP event 4.67 cfs @ 1.22 hrs, Volume= 0.222 af 4.67 c f s @ 1.22 hrs, Volume= 0.222 af, Atten= 0%, Lag= 0.0 min 3.18 cfs @ 1.37 hrs, Volume= 0.191 af 1.92 cfs @ 1.22 hrs, Volume= 0.032 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 599.04' @ 1.22 hrs Device Routing Invert #1 Primary 594.92' Outlet Devices 12.0" Round Culvert L= 220.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet lnvert= 594.92'/ 590.25’ S= 0.02127' Cc= 0.900 n= 0.025 Corrugated metal #2 Secondary 599.00' 100.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=2.75 cfs @ 1.37 hrs HW=598.98' TW=593.77' (Dynamic Tailwater) 1=Culvert (Outlet Controls 2.75 cfs @ 3.50 fps) Secondary OutFlow Max=1.92 cfs @ 1.22 hrs HW=599.04' TW=590.19' (Dynamic Tailwater) ^-2=Broad-Crested Rectangular Weir (Weir Controls 1.92 cfs @ 0.49 fps)