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 15 Summary for Subcatchment 6S: PDA #1 - Impervious to Bio Runoff = 0.38 cfs @ 12.10 hrs, Volume= 0.029 af, Depth= 3.85" 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-Projected Rainfall=4.09", 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 0.42 Runoff 0.38 cfs 0.4 0.38 NOAA 24-hr D 0.36 0.34 2-Year-Projected Rainfall=4.09" 0.32 P2=4.09" 0.3 Runoff Area=3,921 sf 0.28 0.26 Runoff Volume=0.029 af Flow (cfs) 0.24

921 sf 0.28 0.26 Runoff Volume=0.029 af Flow (cfs) 0.24 Runoff Depth=3.85" 0.22 0.2 Flow Length=60' 0.18 Tc=0.5 min 0.16 0.14 CN=98 0.12 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)