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 14 Summary for Subcatchment 5S: PDA #1 - Undetained Pervious Runoff = 0.39 cfs @ 12.13 hrs, Volume= 0.027 af, Depth= 2.12" 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 2-Year-Projected Rainfall=4.09", P2=4.09" Area (sf) CN Description 6,562 80 >75% Grass cover, Good, HSG D 6,562 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.5 20 0.0200 0.10 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 4.09" 0.5 35 0.0200 1.26 Sheet Flow, B-C Smooth surfaces n= 0.011 P2= 4.09" 1.0 326 0.0115 5.64 6.93 Pipe Channel, C-D 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 5.0 381 Total Subcatchment 5S: PDA #1 - Undetained Pervious Hydrograph Runoff 0.42 0.39 cfs 0.4 0.38 NOAA 24-hr D 0.36 2-Year-Projected Rainfall=4.09" 0.34 0.32 P2=4.09" 0.3 Runoff Area=6,562 sf 0.28

P2=4.09" 0.3 Runoff Area=6,562 sf 0.28 0.26 Runoff Volume=0.027 af Flow (cfs) 0.24 Runoff Depth=2.12" 0.22 0.2 Flow Length=381' 0.18 Tc=5.0 min 0.16 0.14 CN=80 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)