J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_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 44 Summary for Subcatchment 6: PO-DA 6 Runoff = 16.46 cfs @ 12.19 hrs, Volume= 1.571 af, Depth= 6.64" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Type III 24-hr 100 yr Rainfall=8.72" Area (sf) 13,009 47,083 39,774 853 22.963 123,682 110,673 13,009 * * * Tc Length (min) (feet) 9.6 100 0.3 0.2 0.2 4.0 14.3 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 Capacity Description (ft/ft) (ft/sec) (cfs) 0.0500 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 80 0.0880 4.45 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 40 0.3130 2.80 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 30 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 296 0.0060 1.25 Shallow Concentrated Flow, Yard stone Un paved Kv= 16.1 fps 546 Total