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 2 Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment PIPE 1: Pipe 1 Drainage Runoff Area=22,990 sf 33.03% Impervious Runoff Depth=4.43" Tc=0.0 min CN=74/98 Runoff=2.87 cfs 8,489 cf Subcatchment PIPE 2: Pipe 2 Drainage Runoff Area=4,104 sf 100.00% Impervious Runoff Depth=6.20" Tc=0.0 min CN=0/98 Runoff=0.64 cfs 2,121 cf Subcatchment PIPE 3: Pipe 3 Drainage Runoff Area=25,320 sf 0.74% Impervious Runoff Depth=3.58" Tc=0.0 min CN=74/98 Runoff=2.80 cfs 7,549 cf Subcatchment PIPE 4: Pipe 4 Drainage Runoff Area=5,311 sf 100.00% Impervious Runoff Depth=6.20" Tc=0.0 min CN=0/98 Runoff=0.82 cfs 2,745 cf Subcatchment PIPE 5: Pipe 5 Drainage Runoff Area=9,375 sf 100.00% Impervious Runoff Depth=6.20" Tc=0.0 min CN=0/98 Runoff=1.45 cfs 4,845 cf Subcatchment PIPE 6: Pipe 6 Drainage Runoff Area=9,375 sf 100.00% Impervious Runoff Depth=6.20" Tc=0.0 min CN=0/98 Runoff=1.45 cfs 4,845 cf Subcatchment Pipe 7: Pipe 7 Drainage Runoff Area=5,990 sf 100.00% Impervious Runoff Depth=6.20" Tc=0.0 min CN=0/98 Runoff=0.93 cfs 3,096 cf Subcatchment Pipe 8: Pipe 8 Drainage Runoff Area=3,612 sf 100.00% Impervious Runoff Depth=6.20" Tc=0.0 min CN=0/98 Runoff=0.56 cfs 1,867 cf Subcatchment Pipe 9: Pipe 9 Runoff Area=7,030 sf 100.00% Impervious Runoff Depth=6.20" Tc=0.0 min CN=0/98 Runoff=1.09 cfs 3,633 cf Total Runoff Area = 93,107 sf Runoff Volume = 39,189 cf Average Runoff Depth = 5.05" 43.53% Pervious = 40,529 sf 56.47% Impervious = 52,578 sf