2026 05 Storm Water Management Report rcd 5 6 2026

2026-04 Proposed & Existing CondiNOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" 2026-04 Proposed & Existing CondiNOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" Prepared by Dynamic Engineering Printed 5/5/2026 Prepared by Dynamic Engineering Printed 5/5/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 15 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 4S: EDA #2 - Pervious Summary for Subcatchment 5S: EDA #3 - Impervious Runoff = 0.03 cfs @ 12.12 hrs, Volume= 0.002 af, Depth= 0.86" Runoff = 0.07 cfs @ 12.15 hrs, Volume= 0.006 af, Depth= 3.85" Routed to Link 2L : POI #2 Routed to Link 3L : POI #3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" NOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" Area (ac) CN Description Area (ac) CN Description 0.029 61 >75% Grass cover, Good, HSG B 0.019 98 Unconnected pavement, HSG B 0.029 100.00% Pervious Area

0.019 98 Unconnected pavement, HSG B 0.029 100.00% Pervious Area 0.019 100.00% Impervious Area 0.019 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) Tc Length Slope Velocity Capacity Description 3.5 20 0.0200 0.10 Sheet Flow, A-B (min) (feet) (ft/ft) (ft/sec) (cfs) Grass: Dense n= 0.240 P2= 4.09" 0.2 9 0.0200 0.96 Sheet Flow, A-B 0.6 133 0.0290 3.46 Shallow Concentrated Flow, B-C Smooth surfaces n= 0.011 P2= 4.09" Paved Kv= 20.3 fps 7.9 91 0.0540 0.19 Sheet Flow, B-C 4.1 153 Total Grass: Dense n= 0.240 P2= 4.09" 0.0 7 0.0540 3.49 Shallow Concentrated Flow, C-D Subcatchment 4S: EDA #2 - Pervious Grassed Waterway Kv= 15.0 fps 8.1 107 Total

Waterway Kv= 15.0 fps 8.1 107 Total Hydrograph 0.032 Runoff Subcatchment 5S: EDA #3 - Impervious 0.03 0.03 cfs Hydrograph 0.028 NOAA 24-hr D 0.026 2-Year-Projected Rainfall=4.09" 0.075 Runoff 0.07 cfs 0.024 P2=4.09" 0.07 NOAA 24-hr D 0.022 Runoff Area=0.029 ac 0.065 2-Year-Projected Rainfall=4.09" 0.02 Runoff Volume=0.002 af

2-Year-Projected Rainfall=4.09" 0.02 Runoff Volume=0.002 af 0.06 P2=4.09" Runoff Depth=0.86" Flow (cfs) 0.018 0.055 Runoff Area=0.019 ac 0.016 Flow Length=153' 0.05 Runoff Volume=0.006 af 0.014 Tc=4.1 min 0.045 Runoff Depth=3.85" Flow (cfs) 0.012 CN=61 0.04 0.01

0.04 0.01 Flow Length=107' 0.035 0.008 Tc=8.1 min 0.03 0.006 CN=98 0.025 0.004 0.02 0.002 0.015 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 0.01 Time (hours) 0.005 0

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)