Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - AJ NOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 35 Summary for Subcatchment 6S: PDA #1 - Impervious to Bio Runoff = 0.60 cfs @ 12.10 hrs, Volume= 0.046 af, Depth= 6.13" 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 10-Year-Projected Rainfall=6.37", P2=4.09" 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) 0.4 42 0.0326 1.59 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 4.09" 0.1 18 0.1180 5.53 Shallow Concentrated Flow, B-C (RIP-RAP) Unpaved Kv= 16.1 fps 0.5 60 Total Subcatchment 6S: PDA #1 - Impervious to Bio Hydrograph Runoff 0.65 0.60 cfs 0.6 NOAA 24-hr D 0.55 10-Year-Projected Rainfall=6.37" 0.5 P2=4.09" 0.45 Runoff Area=3,921 sf Runoff Volume=0.046 af 0.4 Runoff

Runoff Volume=0.046 af 0.4 Runoff Depth=6.13" Flow (cfs) 0.35 Flow Length=60' 0.3 Tc=0.5 min 0.25 CN=98 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)