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. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 46 Summary for Pond Basin4: Basin 4 Inflow Area = Inflow = Outflow = Primary = Secondary = 1.146 ac, 46.51% Impervious, Inflow Depth = 5.59" for 100 yr event 6.59 cfs @ 12.13 hrs, Volume= 0.534 af 5.24 cfs@ 12.27 hrs, Volume= 0.440 af, Atten=21%, Lag= 8.4 min 0.28 cfs @ 12.27 hrs, Volume= 0.218 af 4.96 cfs @ 12.27 hrs, Volume= 0.222 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 590.00'@ 12.27 hrs Surf.Area= 2,582 sf Storage= 5,305 cf Plug-Flow detention time= 133.0 min calculated for 0.440 af (82% of inflow) Center-of-Mass det. time= 52.9 min ( 916.9 - 864.1 ) Volume Invert #1 Avail.Storage Storage Description 5,305 cf Custom Stage Data (Prismatic)Listed below (Recalc) 587.00' Elevation Surf.Area (feet)(sq-ft) (cubic-feet)(cubic-feet) 1,002 1,498 2,015 2,582 587.00 588.00 589.00 590.00 Device Routing Inc.Store 0 1,250 1,757 2,299 Cum.Store 0 1,250 3,007 5,305 Invert Outlet Devices #1 Primary 585.00' #2 #3 Device 1 Device 2 588.50' 589.50' #4 Secondary 589.75' 15.0" Round Culvert L= 37.0' Ke= 0.500 Inlet / Outlet lnvert= 585.00' / 584.00' S= 0.0270 7* Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior 3.0" Vert. Orifice C= 0.600 24.0" x 24.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads 12.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 10.0' Crest Height Primary OutFlow Max=0.28 cfs @ 12.27 hrs HW=590.00' TW=584.73’ (Dynamic Tailwater) 1=Culvert (Passes 0.28 cfs of 11.41 cfs potential flow) 2=Orifice (Orifice Controls 0.28 cfs @ 5.65 fps) 3=Grate (Passes 0.28 cfs of 9.30 cfs potential flow) Secondary OutFlow Max=4.96 cfs @ 12.27 hrs HW=590.00' TW=584.73' (Dynamic Tailwater) 4=Sharp-Crested Rectangular Weir (Weir Controls 4.96 cfs @ 1.65 fps)