Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - AJH NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 5 Summary for Subcatchment 6S: PDA #1 - Impervious to Bio Runoff = 0.33 cfs @ 12.10 hrs, Volume= 0.024 af, Depth= 3.24" 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 2-Year-Current Rainfall=3.47", 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 0.36 Runoff 0.34 0.33 cfs 0.32 NOAA 24-hr D 0.3 2-Year-Current Rainfall=3.47" 0.28 0.26 P2=3.47" 0.24 Runoff Area=3,921 sf 0.22 Runoff Volume=0.024 af Flow (cfs) 0.2

Runoff Volume=0.024 af Flow (cfs) 0.2 Runoff Depth=3.24" 0.18 0.16 Flow Length=60' 0.14 Tc=0.6 min 0.12 CN=98 0.1 0.08 0.06 0.04 0.02 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)