J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 NJ DEP 2-hr NJDEP Rainfall-1.25" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 62 Summary for Subcatchment 5B: PO-DA 5B Runoff = 1.38cfs@ 1.11 hrs, Volume= 0.040af, Depth= 0.81" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" * * * Area (sf) CN Description 16,509 98 Impervious, HSG D 6,800 91 Gravel, HSG D 2,441 80 Grass cover, HSG D 25,750 94 Weighted Average 9,241 88 35.89% Pervious Area 16,509 98 64.11 % Impervious Area Tc (min) 1.1 Length (feet) 150 Slope (ft/ft) 0.0530 Velocity (ft/sec) 2.28 0.3 110 0.0680 5.29 Shallow Concentrated Flow, 0.5 95 0.0260 3.27 Shallow Concentrated Flow, Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" Paved Kv= 20.3 fps Paved Kv= 20.3 fps 355 Total, Increased to minimum Tc = 6.0 min 1.9 Subcatchment 5B: PO-DA 5B Hydrograph -—r 1.38 I NJ: DEP 2-hr NJDEP | ; Rainfall=1.25" Runoff Area=25,750 sf 1- Runoff Volume=0.040 af / Runoff Depth-0.81" Flow Length=355' Tc=6.0 min CN=88/98 % o9 10 11 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 i (hours)