J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange A_03 01 12 Type III 24-hr 10 yr Rainfall=5.21" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 26 Summary for Pond Basin2: Basin 2 0.721 ac, 54.26% Impervious, Inflow Depth = 3.44" for 10 yr event 2.16 cfs@ 12.15 hrs, Volume= 0.207 af 2.15 cfs @ 12.18 hrs, Volume= 0.185 af, Atten= 1%, Lag= 1.7 min 0.115 af 0.24 cfs @ 12.18 hrs, Volume3 1.91 cfs @ 12.18 hrs, Volume3 0.070 af Inflow Area = 3 Inflow 3 Outflow Primary = Secondary = Routing by Dyn-Stor-Ind method, Time Span3 0.00-30.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 598.68' @ 12.18 hrs Surf.Area3 1,073 sf Storage3 1,551 cf Plug-Flow detention time3 93.0 min calculated for 0.185 af (90% of inflow) Center-of-Mass det. time3 43.5 min ( 865.4 - 821.9 ) Volume Invert #1 Avail.Storage Storage Description 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 #1 Primary 594.00' #2 #3 Device 1 Device 2 597.50' 598.00' #4 Secondary 598.50' Outlet Devices 12.0" Round Culvert L= 78.0' Ke= 0.500 Inlet / Outlet Invert3 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=0.24 cfs @ 12.18 hrs HW=598.68' TW=593.76' 1=Culvert (Passes 0.24 cfs of 5.17 cfs potential flow) (Dynamic Tailwater) 2=Orifice (Orifice Controls 0.24 cfs @ 4.94 fps) 3=Grate (Passes 0.24 cfs of 14.56 cfs potential flow) Secondary OutFlow Max=1.91 cfs @ 12.18 hrs HW=598.68’ TW=593.76' (Dynamic Tailwater) ^-4=Broad-Crested Rectangular Weir (Weir Controls 1.91 cfs @ 1.08 fps)