2026 05 Storm Water Management Report rcd 5 6 2026

2026-04 Proposed & Existing Conditi NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" 2026-04 Proposed & Existing Conditi NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" 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 7 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 5S: EDA #3 - Impervious Summary for Subcatchment 6S: EDA #2 - Pervious Runoff = 0.06 cfs @ 12.15 hrs, Volume= 0.005 af, Depth= 3.24" Runoff = 0.04 cfs @ 12.18 hrs, Volume= 0.004 af, Depth= 0.56" Routed to Link 3L : POI #3 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-Current Rainfall=3.47", P2=3.47" NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Area (ac) CN Description Area (ac) CN Description 0.019 98 Unconnected pavement, HSG B 0.084 61 >75% Grass cover, Good, HSG B 0.019 100.00% Impervious Area

0.084 61 >75% Grass cover, Good, HSG B 0.019 100.00% Impervious Area 0.084 100.00% Pervious Area 0.019 100.00% Unconnected Tc Length Slope Velocity Capacity Description Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) (min) (feet) (ft/ft) (ft/sec) (cfs) 9.2 100 0.0540 0.18 Sheet Flow, A-B 0.2 9 0.0200 0.88 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 3.47" Smooth surfaces n= 0.011 P2= 3.47" 0.1 16 0.0540 3.49 Shallow Concentrated Flow, B-C 8.5 91 0.0540 0.18 Sheet Flow, B-C Grassed Waterway Kv= 15.0 fps Grass: Dense n= 0.240 P2= 3.47" 9.3 116 Total 0.0 7 0.0540 3.49 Shallow Concentrated Flow, C-D Grassed Waterway Kv= 15.0 fps Subcatchment 6S: EDA #2 - Pervious 8.7 107 Total Hydrograph Subcatchment 5S: EDA #3 - Impervious

Hydrograph Subcatchment 5S: EDA #3 - Impervious 0.04 Runoff 0.038 0.04 cfs Hydrograph 0.036 NOAA 24-hr D 0.034 0.06 0.06 cfs Runoff 0.032 2-Year-Current Rainfall=3.47" NOAA 24-hr D 0.03 P2=3.47" 0.055 0.028 2-Year-Current

0.028 2-Year-Current Rainfall=3.47" Runoff Area=0.084 ac 0.05 0.026 P2=3.47" 0.024 Runoff Volume=0.004 af Flow (cfs) 0.045 Runoff Area=0.019 ac 0.022 Runoff Depth=0.56" 0.02 0.04 Runoff Volume=0.005 af 0.018 Flow Length=116' Flow (cfs) 0.035 Runoff Depth=3.24" 0.016 Slope=0.0540 '/' 0.014 0.03 Flow Length=107' 0.012

ngth=107' 0.012 Tc=9.3 min 0.025 Tc=8.7 min 0.01 CN=61 0.008 CN=98 0.02 0.006 0.004 0.015 0.002 0.01 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 0.005 Time (hours) 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)