Stormwater Report

512-516 Pleasant Valley Way, West Orange 1240815-pipes Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Prepared by Casey & Keller, Inc Printed 8/25/2025 HydroCAD® 10.20-7a_s/n 03272 © 2025 HydroCAD Software Solutions LLC Page 48 Summary for Subcatchment 4: Proposed Runoff = 0.33 cfs@ 1.07 hrs, Volume= 0.010 af, Depth= 0.61" Routed to Pond 5 : Pipes Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= 0.05 Water Quality Storm Water Quality Rainfall=1.25", P2=3.47" Area (sf) CN Description 3,522 98 Roofs, HSG C 1,136 98 Paved parking, HSG C 3,674 74 >75% Grass cover, Good, HSG C al 60 __98 _Areaway 8,392 87 Weighted Average 3,674 74 43.78% Pervious Area 4,718 98 56.22% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) _ (ft/sec) (cfs) 0.1 8 0.0650 1.38 Sheet Flow, 1 Smooth surfaces n= 0.011 P2= 3.47" 0.1 15 0.6700 3.99 Sheet Flow, 2 Smooth surfaces n= 0.011 P2= 3.47" 0.5 59 0.0500 1.86 Sheet Flow, 3 Smooth surfaces n= 0.011 P2= 3.47" 0.2 10 0.0250 0.99 Sheet Flow, 4 Smooth surfaces_n= 0.011 P2= 3.47" 0.9 92 Total 55