J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange A_03 01 12 NJ DEP 2-hrNJDEP RainfalM.25" Prepared by TRC Engineers, Inc. Printed 3/14/2012 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 51 Summary for Subcatchment 1A: 1A Runoff = 0.22 cfs @ 1.13 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.007 af, Depth= 0.29" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description ★ 2,107 10.364 98 78 Impervious, HSG D Meadow, non-grazed, HSG D 12,471 10,364 2,107 81 78 98 Weighted Average 83.10% Pervious Area 16.90% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 4.3 70 0.1860 0.27 Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, 0.4 70 0.0429 3.11 Grassed Waterway Kv= 15.0 fps 4.7 140 Total, Increased to minimum Tc = 6.0 min Subcatchment 1A: 1A Hydrograph 24-/^ -; |0.22 cfs ■ pr -L.1__ ____ L _ i _ - . 1 ___________t _ 1 _ J _ 0.21 J.29.19- ri 0.184 0.17- it / / 0.160.15-: - 0.14-: rt . ,L-i_- u 0.13 . . J 0.12 2 0.11 3.1 0.090.084 0.074 0.064 ..L J. - J - - ____I NJ DEP 2-hr NJDEP Rainfall=1.25" Runoff Area=12,471 sf Runoff Volume=0.007 af Runoff Depth=0.29" Flow Length=140' Tc=6 0 min CN=78/98 3.050.044 ,i.j 0.034 L . J 0.02 0.01 0 1 2 3 4 5 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) dt= 0.01 hrs