J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange A_03 01 12 NJ DEP 2-hr NJDEP Rainfall=1.25" Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 54 Summary for Subcatchment 3A: PO-DA 3 Runoff = 0.57 cfs @ 1.21 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.023 af, Depth= 0.58" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * 10,141 10,571 98 Gravel road, HSG D 78 Meadow, non-grazed, HSG D 20,712 10,571 10,141 88 Weighted Average 78 51.04% Pervious Area 98 48.96% Impervious Area Tc (min) Length (feet) 13.8 100 Slope Velocity Capacity (ft/ft) (ft/sec) Description (cfs) Sheet Flow, 0.0200 0.12 Grass: Dense n= 0.240 P2= 3.42" 0.5 92 0.0400 3.00 0.2 50 0.0200 4.84 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Pipe Channel, 5.94 15.0" Round Area=1.2sf Perim= 3.9' r=0.31' n= 0.020 Corrugated PE, corrugated interior 242 14.5 Total Subcatchment 3A: PO-DA 3 Hydrograph n—;—i—i—i—r -- *1 I'i.i.rrh' ► “ 4 —1 0.57 cfs 1; : : I i urn ** - - - - - “i—i—i—r - - ► - 4 - H ---- I - - h - - 4 — -1— I-- - » • - 4 - 4 -------I ------1 - - • - 4 ------ U — 4 - 05 0.45 - -4 - 0.4- I_u - t _ J « 0.350.3- ) --- 4 - H --------- —I--------i- . 0.55- 4-----------I - - - _i 0.25 NJ DEP 2-hr NJDEP Rainfa 11=1.25" RunoffArea=20,712 sf Runoff Vplume=0.023 af Runoff Depth=0.58" 1 Flow Length=242' Tc=14.5 min I 1 » 4 CN=78/98 ----L_i--------- I___ ____l ____ ( ____ 1 _ J _______ _ _l_ _ 0.2L . L - J ___ __ L _ 1____ I___I__ L _ 1____ L _ L _ 1 __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ l ___ L _ 1 _ _ _ _ _ _ _ _ I _ _ _ _ __ _____ ___ 0.15__ I___1____ I___ ____ I ____1 ______ I __________________________________I ________________ ( ________________ i . _ J ___________ 0l -- A 0.05234 56 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 28 27 28 29 30 Time (hours)