J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HvdroCAD Software Solutions LLC Printed 3/14/2012 Page 66 Summary for Subcatchment 9C: PO-DA 9C Runoff = 1.45 cfs @ 1.22 hrs, Volume= 0.058 af, Depth= 0.57" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" * * * 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 - Slope Velocity Capacity (ft/ft) (fl/sec) (cfs) 0.0270 0.13 Description Sheet Flow, Yard Stone 160 0.0220 2.39 Shallow Concentrated Flow, Yard Stone 1.3 120 0.0085 1.48 Shallow Concentrated Flow, Yard Stone 15.0 380 Total n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Un paved Kv= 16.1 fps Subcatchment 9C: PO-DA 9C Hydrograph >1 1 1 1 1 1 . 1 1 1 1 ■i i i i j .i i / i i i i i 1 ii i i i i i ii* *i i i i i i i i i . 4 5 cfs i i i i i i i —r1 i i i i i i ii 1 1 , 1 1 1 1 1 i i i i i i i i i i I i i i i i I i i i i i I ■ ’ — ■ I I I I I I II•I ■ ; Rainfall=1.25" Runoff Area=52,660 sf 1 - unoff Volume=0.058 af Runoff Depth=0.57" Flow Length=380' Tc=15,0 min CN=85/98 mm#mm 1 2 34 5678 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 28 27 28 29 30 Time (hours)