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 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 Link 6L: POI #3 Summary for Subcatchment 7S: Proposed Roof Inflow Area = 0.076 ac, 0.00% Impervious, Inflow Depth = 1.61" for 2-Year-Current event Runoff = 0.61 cfs @ 12.10 hrs, Volume= 0.046 af, Depth= 3.85" Inflow = 0.13 cfs @ 12.17 hrs, Volume= 0.010 af Routed to Pond 1P : UG BASIN Primary = 0.13 cfs @ 12.17 hrs, Volume= 0.010 af, Atten= 0%, Lag= 0.0 min Routed to nonexistent node 18L 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" Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Area (ac) CN Description Link 6L: POI #3

Area (ac) CN Description Link 6L: POI #3 0.142 98 Roofs, HSG D Hydrograph 0.142 100.00% Impervious Area Inflow Tc Length Slope Velocity Capacity Description 0.13 cfs Primary 0.14 0.13 cfs (min) (feet) (ft/ft) (ft/sec) (cfs) 0.13 Inflow Area=0.076 ac 1.0 Direct Entry, 0.12 0.11 Subcatchment 7S: Proposed Roof 0.1 Hydrograph 0.09 Runoff 0.65 0.61 cfs Flow (cfs) 0.08 0.07

0.65 0.61 cfs Flow (cfs) 0.08 0.07 0.6 NOAA 24-hr D 0.06 0.55 2-Year-Projected Rainfall=4.09" 0.05 0.5 P2=4.09" 0.04 0.45 Runoff Area=0.142 ac 0.03 0.4 Runoff Volume=0.046 af Flow (cfs) 0.02 Runoff Depth=3.85" 0.35 0.01

0.35 0.01 Tc=1.0 min 0.3 0 CN=98 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 0.25 Time (hours) 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)