Drainage Report and Supplement 82625

2025-08-21_Pipe Capacity Calculations NOAA 24-hr D 25-Year Rainfall=6.44" Prepared by Stonefield Engineering & Design HydroCAD® 10.20-5c s/n 06682 © 2023 HydroCAD Software Solutions LLC Printed 8/21/2025 Page 4 Summary for Subcatchment PIPE 2: Pipe 2 Drainage Runoff = 0.64 cfs @ 12.09 hrs, Volume= 2,121 cf, Depth= 6.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 25-Year Rainfall=6.44" Area (sf) 4,104 4,104 * CN 98 98 Description Impervious Area 100.00% Impervious Area Subcatchment PIPE 2: Pipe 2 Drainage Hydrograph 0.7 Runoff 0.64 cfs 0.65 0.6 0.55 0.5 Flow (cfs) 0.45 0.4 0.35 0.3 0.25 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=4,104 sf Runoff Volume=2,121 cf Runoff Depth=6.20" Tc=0.0 min CN=0/98 0.2 0.15 0.1 0.05 0 0 2 4 6 8 10 12 14 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)