J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange A_03 01 12 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 40 Summary for Pond Basinl: Basin 1 0.475 ac, 48.96% Impervious, Inflow 2.85 cfs@ 12.19 hrs, Volume= 2.82 cfs@ 12.21 hrs, Volume= 0.12 cfs @ 12.21 hrs, Volume= 2.70 cfs@ 12.21 hrs, Volume= Inflow Area = Inflow = Outflow = Primary = Secondary = Depth = 7.24" for 100 yr event 0.287 af 0.252 af, Atten= 1 %, Lag= 1.2 min 0.100 af 0.152 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 604.97’ @ 12.21 hrs Surf.Area= 1,341 sf Storage= 2,108 cf Plug-Flow detention time= 114.5 min calculated for 0.252 af (88% of inflow) Center-of-Mass det. time= 57.5 min ( 832.9 - 775.4 ) Volume Invert Avail-Storage Storage Description #1 602.50' 2,496 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store 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 #1 Primary 601.00’ #2 #3 Device 1 Device 2 603.50’ 604.50' #4 Secondary 604.75' Outlet Devices 15.0" Round Culvert L= 140.0' Ke= 0.500 Inlet / Outlet lnvert= 601.00’ / 600.00' S= 0.0071 ’/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior 2.0" Vert. Orifice C= 0.600 24.0" x 24.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads 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 @ 12.21 hrs HW=604.97' TW=598.77' (Dynamic Tailwater) 1=Culvert (Passes 0.12 cfs of 6.25 cfs potential flow) 2=Orifice (Orifice Controls 0.12 cfs @ 5.67 fps) 3=Grate (Passes 0.12 cfs of 8.48 cfs potential flow) Secondary OutFlow Max=2.69 cfs @ 12.21 hrs HW=604.97' TW=598.77' (Dynamic Tailwater) ^-4=Broad-Crested Rectangular Weir(Weir Controls 2.69 cfs @ 1.21 fps)