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 HydroCAD Software Solutions LLC NJ DEP 2-hrNJDEP Rainfall=1.25" Printed 3/14/2012 Page 63 Summary for Subcatchment 6: PO-DA 6 1.60 cfs @ Runoff = 1.24 hrs, Volume= 0.067 af, Depth3 0.28" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span3 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hrNJDEP Rainfall=1.25" Area (sf) 13,009 47,083 39,774 853 22,963 123,682 110,673 13,009 * * * Tc (min) 9.6 Length (feet) 100 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 (ft/ft) 0.0500 Velocity (ft/sec) 0.17 Capacity (cfs) Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 0.3 80 0.0880 4.45 0.2 40 0.3130 2.80 Shallow Concentrated Flow, Grassed Waterway Kv=15.0fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.2 30 0.0330 2.92 Shallow Concentrated Flow, 4.0 296 0.0060 1.25 Shallow Concentrated Flow, Yard stone Unpaved Kv= 16.1 fps Unpaved Kv= 16.1 fps 14.3 546 Total