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 45 Summary for Subcatchment 6S: PDA #1 - Impervious to Bio Runoff = 0.87 cfs @ 12.10 hrs, Volume= 0.067 af, Depth= 8.94" Routed to Pond 2P : BIO 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 100-Year-Current Rainfall=9.18", P2=3.47" Area (sf) CN Description 3,921 98 Paved parking, HSG B 3,921 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.5 42 0.0326 1.46 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" 0.1 18 0.1180 5.53 Shallow Concentrated Flow, B-C (RIP-RAP) Unpaved Kv= 16.1 fps 0.6 60 Total Subcatchment 6S: PDA #1 - Impervious to Bio Hydrograph 0.95 Runoff 0.87 cfs 0.9 0.85 NOAA 24-hr D 0.8 100-Year-Current Rainfall=9.18" 0.75 P2=3.47" 0.7 0.65 Runoff Area=3,921 sf 0.6 Runoff Volume=0.067 af

Area=3,921 sf 0.6 Runoff Volume=0.067 af Runoff Depth=8.94" Flow (cfs) 0.55 0.5 Flow Length=60' 0.45 0.4 Tc=0.6 min 0.35 CN=98 0.3 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)