J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 10 yr Rainfall=5.21" Post Development West Orange C_03 01 12 Printed 3/14/2012 Page 30 Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 9D: PO-DA 9D 0.423 af, Depth= 4.01" 4.33 cfs @ 12.19 hrs, Volume= Runoff = Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Type III 24-hr 10 yr Rainfall=5.21" Area (sf) CN Description 98 Impervious, HSG D 1,192 98 Gravel road, HSG D 16,177 85 Yard Stone, HSG D 37,810 89 Weighted Average 55,179 68.52% Pervious Area 85 37,810 31.48% Impervious Area 98 17,369 * * * Slope Velocity Capacity (cfs) (ft/ft) (ft/sec) 0.13 0.0270 Tc (min) 12.6 Length (feet) 100 0.8 120 0.0270 2.65 1.1 130 0.0140 1.90 14.5 350 Total Description Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Shallow Concentrated Flow, Yard Stone Unpaved Kv= 16.1 fps Shallow Concentrated Flow, Yard Stone Unpaved Kv= 16.1 fps Subcatchment 9D: PO-DA 9D Hydrograph | 4.33 cfs Type III 24-hr 10 yr : ; Rainfall-5.21" Runoff Area-55,179 sf _ I_____ I____ I____I____L _ J_______ 1___ 1____i _ I___i _ J Runoff Volume=0.423 af 3- Jt o, Runoff Depth-4.01" 8 u. Flow Length-350' 2- Tc=14.5 min 1- i CN=85/98 J i l l —-t00 1 2 34 56 78 9 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tima (hours)