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 42 Summary for Pond Basin2: Basin 2 Inflow Area = Inflow = Outflow = Primary = Secondary = 0.721 ac, 54.26% Impervious, Inflow Depth = 6.79" for 100 4.03 cfs@ 12.14 hrs, Volume= 0.408 af 4.02 cfs @ 12.16 hrs, Volume= 0.387 af, Atten= 0%, 0.25 cfs @ 12.16 hrs, Volumes 0.179 af 3.76 cfs@ 12.16 hrs, Volumes 0.208 af yr event Lags -|4-| min Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 598.78'@ 12.16 hrs Surf.Area= 1,119 sf Storages 1,660 cf Plug-Flow detention time= 59.8 min calculated for 0.387 af (95% of inflow) Center-of-Mass det. time= 31.1 min ( 835.5 - 804.4 ) Volume Invert Avail.Storage Storage Description #1 4,191 cf Custom Stage Data (Prismatic)Listed below (Recalc) 596.25' Elevation (feet) Surf.Area (sq-ft) Inc.Store (cubic-feet) Cum.Store (cubic-feet) 596.25 597.25 598.25 599.25 600.25 319 536 878 1,335 2,565 0 428 707 1,107 1,950 0 428 1,135 2,241 4,191 Device Routing Invert Outlet Devices #1 Primary 594.00' #2 #3 Device 1 Device 2 597.50' 598.00’ #4 Secondary 598.50' 12.0" Round Culvert L= 78.0' Ke= 0.500 Inlet / Outlet lnvert= 594.00' / 592.00' S= 0.0256 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 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=0.25 cfs @12.16 hrs HW=598.78’ TW=594.99' 1=Culvert (Passes 0.25 cfs of 4.54 cfs potential flow) 2=Orifice (Orifice Controls 0.25 cfs @ 5.17 fps) 3=Grate (Passes 0.25 cfs of 16.97 cfs potential flow) (Dynamic Tailwater) Secondary OutFlow Max=3.76 cfs @ 12.16 hrs HW=598.78' TW=594.99' (Dynamic Tailwater) 4=Broad-Crested Rectangular Weir (Weir Controls 3.76 cfs @ 1.36 fps)