J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 NJ DEP 2-hr NJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. Printed 3/4/2012 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 71 Summary for Subcatchment 5S: EX-DA 5 Runoff = 1.20 cfs @ Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" 1.11 hrs, Volume= UH=SCS, Split 0.036 af, Depth= 0.92" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * 17,517 2,694 98 Paved road, HSG D 80 Grass cover , Good. HSG D 20,211 2,694 17,517 96 Weighted Average 80 13.33% Pervious Area 98 86.67% Impervious Area Tc (min) Length (feet) 0.8 100 0.0570 2.16 0.4 120 0.0790 5.71 0.3 50 0.0250 3.21 0.3 55 0.0320 3.63 1.8 325 Total, Increased to minimum Tc = 6.0 min Slope Velocity (ft/ft) (ft/sec) Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Subcatchment 5S: EX-DA 5 Hydrograph 1.20 cfs \m NJ DEP 2-hr NJDEP -i- Rainfall=1.25" Runoff Area=20,211 sf Runoff Volume=0.036 af Runoff Depth=0.92M Flow Length=325' Tc=6.0 min CN=80/98 y / y y * y 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) dt= 0.01 hrs