Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - AJHNOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment 3S: Proposed Roof Runoff = 0.61 cfs @ 12.10 hrs, Volume= 0.046 af, Depth= 3.85" Routed to Pond 1P : UG BASIN 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" Area (sf) CN Description 6,205 98 Roofs, HSG B 6,205 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 3S: Proposed Roof Hydrograph Runoff 0.65 0.61 cfs 0.6 NOAA 24-hr D 0.55 2-Year-Projected Rainfall=4.09" 0.5 P2=4.09" 0.45 Runoff Area=6,205 sf 0.4 Runoff Volume=0.046 af Flow (cfs) Runoff Depth=3.85" 0.35 Tc=1.0 min 0.3

Runoff Depth=3.85" 0.35 Tc=1.0 min 0.3 CN=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)