J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 46 Summary for Subcatchment 2: PO-DA 2 Runoff = 3.40 cfs @ 12.23 hrs, Volume= 0.345 af, Depth= 6.18" 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 100 yr Rainfall=8.72" Area (sf) CN Description * * * 0 0 9,261 19.890 98 Impervious, HSG D 98 Gravel road, HSG D 80 Grass, Good, HSG D 78 Meadow, non-qrazed, HSG D 29,151 29,151 79 Weighted Average 79 100.00% Pervious Area Tc (min) Length (feet) Slope (ft/ft) 12.1 120 0.0400 0.17 0.3 75 0.0600 3.67 Velocity Capacity (ft/sec) (cfs) Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 1.9 140 0.0070 Shallow Concentrated Flow, 1.25 Grassed Waterway Kv= 15.0 fps 1.2 130 0.0150 1.84 Shallow Concentrated Flow, 1.7 360 0.0540 3.49 Shallow Concentrated Flow, 0.4 190 0.0100 7.20 Grassed Waterway Kv= 15.0 fps Grassed Waterway Kv= 15.0 fps 22.62 Pipe Channel, Culvert to Discharge 24.0" Round Area= 3.1 sf Perim= 6.3’ r= 0.50' n= 0.013 Corrugated PE, smooth interior 17.6 1,015 Total