Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - AJ NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 43 Summary for Subcatchment 4S: PDA #1 - Undetained Impervious Runoff = 1.96 cfs @ 12.10 hrs, Volume= 0.152 af, Depth= 8.94" Routed to Link 2L : POI #1 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 100-Year-Current Rainfall=9.18", P2=3.47" Area (sf) CN Description 8,866 98 Paved parking, HSG D 8,866 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.1 93 0.0188 1.38 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" 1.0 326 0.0115 5.64 6.93 Pipe Channel, B-C 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 2.1 419 Total Subcatchment 4S: PDA #1 - Undetained Impervious Hydrograph Runoff 1.96 cfs 2 NOAA 24-hr D 100-Year-Current Rainfall=9.18" P2=3.47" Runoff Area=8,866 sf Runoff Volume=0.152 af

Runoff Volume=0.152 af Runoff Depth=8.94" Flow (cfs) Flow Length=419' 1 Tc=2.1 min CN=98 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)