J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange A_03 01 12 Prepared by TRC Engineers, Inc. Printed 3/14/2012 Page 5 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LUC Summary for Subcatchment 1C: 1C Runoff = 0.55 cfs @ 12.09 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.042 af, Depth= 2.21" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * 4,402 5,534 98 Impervious, HSG D 78 Meadow, non-qrazed, HSG D 9,936 5,534 4,402 87 Weighted Average 78 55.70% Pervious Area 98 44.30% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.6 50 0.0300 1.46 0.4 92 0.0666 3.87 1.0 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 142 Total, Increased to minimum Tc = 6.0 min Subcatchment 1C: 1C Hydrograph 0.8- ----- ----- 1—h 0.55- ---------------- 0.55 cfs 0.5: 0.450.4- — j. -1 — —i - -i _ - 2 0.35* 0.3- 5 u. 0.25- 0.20.15-; • Type III 24-hr 2 yr Li i Rainfall=3.42" : Runoff Area=9,936 sf Runoff Volume=0.042 af Runoff Depth=2.21" Flow Length=142' Tc=6.0 min CN=78/98 0.1: i ____ U . i. _ J .. 0.05: 00 1 2 34 5 6 7 1M I l p 11 p 111 [1 m i| pi n |i n h'i ii i| ii n n nip mpii n n iiI ip p M Iii H ' 1; 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