J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared b y T R C Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 82 Summary for Pond 10P: CB-2 to CB-1 [57] Hint: Peaked at 593.86' (Flood elevation advised) Inflow Area = Inflow = Outflow = Primary = Secondary = 8.995 ac, 28.42% Impervious, Inflow Depth = 0.41" for NJDEP event 6.70 cfs @ 1.12 hrs, Volume= 0.307 af 6.70 cfs @ 1.12 hrs, Volume= 0.307 af, Atten= 0%, Lag= 0.0 min 3.83 cfs @ 1.12 hrs, Volume= 0.269 af 2.87 cfs @ 1.12 hrs, Volume= 0.037 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 593.86’ @ 1 . 1 2 h r s Invert Outlet Devices Device Routing 12.0" Round Culvert 590.00' #1 Primary L= 330.0’ CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet lnvert= 590.00' / 578.00' S= 0.0364 7 Cc= 0.900 n= 0.025 Corrugated metal 30.0' long x 10.0' breadth Broad-Crested Rectangular Weir #2 Secondary 593.75' Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=3.83 cfs @ 1.12 hrs HW=593.86' TW=577.32' (Dynamic Tailwater) ■1=Culvert (Barrel Controls 3.83 cfs @ 4.88 fps) Secondary OutFlow Max=2.87 cfs @ 1.12 hrs HW=593.86' TW=590.19' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir (Weir Controls 2.87 cfs @ 0.84 fps) Pond 10P: CB-2 to CB-1 Hydrograph — i -T i --- i W\ ■ 7- 1 ! i i ' i 1 “ _ i T r i i l ■ “ i ' 1 i ' 3.83 cfs □I i -1 i i i — 1 i --------------------- 1 — i i 1 i i i i t i i r t • i i i i i _ i _ i ___ i i i i i i“ i 1 i » » i “ i i i - J 1 1 1 1 I 1 1 1 1 1 ■ i --------- 1 ---—1 1 1 1 1 i i i i J -- 1 1 1 -- 1 1 --- 1 1 1 1 Inflow Are ra=8. 995 ac ! Peak Elev-593.86' i i i 6- --1 i - | 1 | 1 1 1 1 - J _1 1 | - 1 1 1 | 1 1 I 1 . 1 ____________ , l _ 1 1 1 1 1 1 i i t i i i 1 1 1 1 1 i i t i _ ! i _ i . 1 . i i - 87 c fs i— c mKB A i i t 4- 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) r i i -- 1 ■ Inflow □ Outflow ■ Primary ■ Secondary