Stormwater Report

512-516 Pleasant Valley Way, West Orange 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", 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 13 Summary for Subcatchment 6: Bypass Runoff = 0.02 cfs@ 12.14 hrs, Volume= 0.001 af, Depth= 1.22" Routed to Link 7 : Proposed 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 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 605 74 _>75% Grass cover, Good, HSG C 605 74 100.00% Pervious Area Te Length Slope Velocity Capacity Description (min) (feet) (ft/ft)__ (ft/sec) (cfs) 5.9 100 0.0650 0.28 Sheet Flow, 1 Grass: Short n= 0.150 P2= 3.47" 0.1 28 0.0900 4.50 Shallow Concentrated Flow, 2 Grassed Waterway Kv= 15.0 fps 6.0 128 Total Subcatchment 6: Bypass Hydrograph “02 ot NOAA 24-hr D 0.017 2-Year-2020 Rainfall=3.47" ors P2=3.47" tonal Runoff Area=605 sf Z 00124 Runoff Volume=0.001 af 3 oot, Runoff Depth=1.22" ~ hes Flow Length=128" peak Tc=6.0 min ° 0.005: CN=74/0 0.0044 0,003: 0.0024 0.001 0 2 4 & 8B 10 1214 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 20