J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange B_03 01 12 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 9 Summary for Subcatchment 9C: PO-DA 9C Runoff = 2.45 cfs@ 12.20 hrs, Volume= 0.243 af, Depth= 2.41" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmpen/., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Type III 24-hr 2 yr Rainfall=3.42" * * * Area (sf) CN Description 1,117 98 Impervious, HSG D 18,457 98 Gravel road, HSG D 85 Yard stone, HSG D 33,086 52,660 90 Weighted Average 33,086 85 62.83% Pervious Area 19,574 98 37.17% Impervious Area Tc (min) 12.6 Length (feet) 100 1.1 Description Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0270 0.13 Sheet Flow, Yard Stone 160 0.0220 2.39 Shallow Concentrated Flow, Yard Stone 1.3 120 0.0085 1.48 15.0 380 Total n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Shallow Concentrated Flow, Yard Stone Unpaved Kv= 16.1 fps Subcatchment 9C: PO-DA 9C Hydrograph 2.45 l. . I - . cfs Type III 24-hr 2 yr Rainfall=3.42" i i i i i i i i i i i Runoff Area=52,660 sf Runoff Volume=0.243 af Runoff Depth=2.41" Flow Length=380’ Tc=15.0 min CN=85/98 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)