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 17 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment 6S: EDA #2 - Pervious Summary for Link 1L: POI #1 Runoff = 0.07 cfs @ 12.17 hrs, Volume= 0.006 af, Depth= 0.86" Inflow Area = 0.534 ac, 70.60% Impervious, Inflow Depth = 2.97" for 2-Year-Projected event Routed to Link 3L : POI #3 Inflow = 1.75 cfs @ 12.10 hrs, Volume= 0.132 af Primary = 1.75 cfs @ 12.10 hrs, Volume= 0.132 af, Atten= 0%, Lag= 0.0 min Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Routed to nonexistent node 15L NOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Area (ac) CN Description 0.084 61 >75% Grass cover, Good, HSG B

CN Description 0.084 61 >75% Grass cover, Good, HSG B Link 1L: POI #1 0.084 100.00% Pervious Area Hydrograph Tc Length Slope Velocity Capacity Description Inflow 1.75 cfs Primary (min) (feet) (ft/ft) (ft/sec) (cfs) 1.75 cfs 8.5 100 0.0540 0.20 Sheet Flow, A-B Inflow Area=0.534 ac Grass: Dense n= 0.240 P2= 4.09" 0.1 16 0.0540 3.49 Shallow Concentrated Flow, B-C Grassed Waterway Kv= 15.0 fps 8.6 116 Total Flow (cfs) Subcatchment 6S: EDA #2 - Pervious 1 Hydrograph Runoff 0.07 0.07 cfs

Runoff 0.07 0.07 cfs 0.065 NOAA 24-hr D 0.06 2-Year-Projected Rainfall=4.09" 0.055 P2=4.09" 0.05 Runoff Area=0.084 ac 0.045 Runoff Volume=0.006 af 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 Runoff Depth=0.86" Flow (cfs) 0.04 Time (hours) 0.035 Flow Length=116' Slope=0.0540 '/' 0.03 Tc=8.6 min 0.025 CN=61 0.02 0.015 0.01 0.005 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)