1240815StormWaterManagementReportrcd 3 12 2026

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 25-Year-2020 Rainfall=6.72", P2=3.47" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Subcatchment 4: Proposed Runoff = 1.05 cfs @ 12.06 hrs, Volume= 0.077 af, Depth= 5.53" 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 NOAA 24-hr D 25-Year-2020 Rainfall=6.72", P2=3.47" Area (sf) CN Description 3,426 98 Roofs, HSG C 1,265 98 Paved parking, HSG C 2,575 74 >75% Grass cover, Good, HSG C 7,266 89 Weighted Average 2,575 74 35.44% Pervious Area 4,691 98 64.56% 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" 0.2 15 0.0670 1.59 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" 1.0 92 Total 46