J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 Prepared by TRC Engineers, Inc, HydroCAD® 9.10 s/n 06401 © 2009 HvdroCAD Software Solutions LLC Type III 24-hr 10 yr Rainfall=5.21" Printed 3/14/2012 Page 25 Summary for Subcatchment 6: PO-DA 6 0.795 af, Depth= 3.36" 8.46 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) 13,009 47,083 39,774 853 22,963 123,682 110,673 13,009 * * * CN 98 85 80 78 73 82 81 98 Description Impervious, HSG D Yard stone, HSG D Grass cover, Good, HSG D Meadow, non-grazed, HSG D Brush, Good, HSG D Weighted Average 89.48% Pervious Area 10.52% Impervious Area Slope Velocity (ft/ft) (ft/sec)(cfs) Tc (min) Length (feet) 9.6 100 0.0500 0.17 0.3 80 0.0880 4.45 0.2 40 0.3130 2.80 0.2 30 0.0330 2.92 4.0 296 0.0060 1.25 14.3 546 Total Capacity Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps Shallow Concentrated Flow, Unpaved Kv= 16.1 fps Shallow Concentrated Flow, Yard stone Unpaved Kv= 16.1 fps