Drainage Report and Supplement 82625

NOAA 24-hr D 25-Year Rainfall=6.44" 2025-08-21_Pipe Capacity Calculations Prepared by Stonefield Engineering & Design HydroCAD® 10.20-5c s/n 06682 © 2023 HydroCAD Software Solutions LLC Printed 8/21/2025 Page 5 Summary for Subcatchment PIPE 3: Pipe 3 Drainage Runoff = 2.80 cfs @ 12.09 hrs, Volume= 7,549 cf, Depth= 3.58" 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) 188 2,557 22,575 25,320 25,132 188 * * CN 98 74 74 74 74 98 Description Impervious Area >75% Grass cover, Good, HSG C Sand Riding Area Weighted Average 99.26% Pervious Area 0.74% Impervious Area Subcatchment PIPE 3: Pipe 3 Drainage Hydrograph Runoff 3 2.80 cfs Flow (cfs) 2 1 0 0 2 4 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=25,320 sf Runoff Volume=7,549 cf Runoff Depth=3.58" Tc=0.0 min CN=74/98 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)

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 6 Summary for Subcatchment PIPE 4: Pipe 4 Drainage Runoff = 0.82 cfs @ 12.09 hrs, Volume= 2,745 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) 5,311 5,311 * CN 98 98 Description Impervious Area 100.00% Impervious Area Subcatchment PIPE 4: Pipe 4 Drainage Hydrograph Runoff 0.9 0.82 cfs 0.85 0.8 0.75 0.7 0.65 Flow (cfs) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=5,311 sf Runoff Volume=2,745 cf Runoff Depth=6.20" Tc=0.0 min CN=0/98 0.25 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)

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 7 Summary for Subcatchment PIPE 5: Pipe 5 Drainage Runoff = 1.45 cfs @ 12.09 hrs, Volume= 4,845 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) 9,375 9,375 * CN 98 98 Description impervious Area 100.00% Impervious Area Subcatchment PIPE 5: Pipe 5 Drainage Hydrograph Runoff 1.45 cfs Flow (cfs) 1 0 0 2 4 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=9,375 sf Runoff Volume=4,845 cf Runoff Depth=6.20" Tc=0.0 min CN=0/98 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)

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 8 Summary for Subcatchment PIPE 6: Pipe 6 Drainage Runoff = 1.45 cfs @ 12.09 hrs, Volume= 4,845 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) 9,375 9,375 * CN 98 98 Description Impervious Area 100.00% Impervious Area Subcatchment PIPE 6: Pipe 6 Drainage Hydrograph Runoff 1.45 cfs Flow (cfs) 1 0 0 2 4 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=9,375 sf Runoff Volume=4,845 cf Runoff Depth=6.20" Tc=0.0 min CN=0/98 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)

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 9 Summary for Subcatchment Pipe 7: Pipe 7 Drainage Runoff = 0.93 cfs @ 12.09 hrs, Volume= 3,096 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) 5,990 5,990 * CN 98 98 Description Impervious Area 100.00% Impervious Area Subcatchment Pipe 7: Pipe 7 Drainage Hydrograph Runoff 1 Flow (cfs) 0.93 cfs 0 0 2 4 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=5,990 sf Runoff Volume=3,096 cf Runoff Depth=6.20" Tc=0.0 min CN=0/98 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)

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 10 Summary for Subcatchment Pipe 8: Pipe 8 Drainage Runoff = 0.56 cfs @ 12.09 hrs, Volume= 1,867 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) 3,612 3,612 * CN 98 98 Description Impervious Area 100.00% Impervious Area Subcatchment Pipe 8: Pipe 8 Drainage Hydrograph Runoff 0.6 0.56 cfs 0.55 0.5 0.45 Flow (cfs) 0.4 0.35 0.3 0.25 0.2 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=3,612 sf Runoff Volume=1,867 cf Runoff Depth=6.20" Tc=0.0 min CN=0/98 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)

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 11 Summary for Subcatchment Pipe 9: Pipe 9 Runoff = 1.09 cfs @ 12.09 hrs, Volume= 3,633 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) 7,030 7,030 * CN 98 98 Description Impervious Area 100.00% Impervious Area Subcatchment Pipe 9: Pipe 9 Hydrograph Runoff 1.09 cfs Flow (cfs) 1 0 0 2 4 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=7,030 sf Runoff Volume=3,633 cf Runoff Depth=6.20" Tc=0.0 min CN=0/98 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)

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