J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange A_03 01 12 Prepared by TRC Engineers, Inc. Printed 3/14/2012 Page 8 HvdroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Summary for Pond Basinl: Basin 1 0.475 ac, 48.96% Impervious, Inflow Depth = 2.29" for 2 yr event 0.91 cfs @ 12.20 hrs, Volume= 0.091 af 0.52 cfs@ 12.43 hrs, Volume3 0.056 af, Atten= 42%, Lag3 13.8 min 3 0.12 cfs@ 12.43 hrs, Volume 0.045 af 0.41 cfs@ 12.43 hrs, Volume3 0.011 af Inflow Area = 3 Inflow Outflow = Primary = Secondary = Routing by Dyn-Stor-Ind method, Time Span3 0.00-30.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 604.81'@ 12.43 hrs Surf.Area3 1,280 sf Storage3 1,900 cf Plug-Flow detention time3 221.8 min calculated for 0.056 af (62% of inflow) Center-of-Mass det. time3 111.9 min ( 903.7 - 791.9 ) Volume Invert Avail-Storage Storage Description #1 2,496 cf Custom Stage Data (Prismatic)Listed below (Recalc) 602.50' Elevation (feet) Surf.Area (sq-ft) Inc.Store (cubic-feet) Cum. Store (cubic-feet) 602.50 603.25 604.25 605.25 120 755 1,067 1,446 0 328 911 1,257 0 328 1,239 2,496 Device Routing Invert Outlet Devices #1 Primary 601.00' 15.0" Round Culvert L= 140. #2 Device #3 Device 2 1 Ke= 0.500 Inlet / Outlet Invert3 601.00' / 600.00' S= 0.0071 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior 603.50' 2.0" Vert. Orifice C= 0.600 604.50' 24.0" x 24.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads #4 Secondary 604.75' 10.0’ long x 12.0' 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) 2.57 2.62 2.70 2.67 2.66 2.67 2.66 2.64 Primary OutFlow Max=0.12 cfs @ 12.43 hrs HW=604.81’ TW=598.48' (Dynamic Tailwater) 1=Culvert (Passes 0.12 cfs of 6.12 cfs potential flow) 2=Orifice (Orifice Controls 0.12 cfs @ 5.34 fps) 3=Grate (Passes 0.12 cfs of 4.58 cfs potential flow) Secondary OutFlow Max=0.41 cfs @ 12.43 hrs HW=604.81' TW=598.48' (Dynamic Tailwater) 4=Broad-Crested Rectangular Weir(Weir Controls 0.41 cfs @ 0.65 fps)