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 44 Summary for Subcatchment 5S: PDA #1 - Undetained Pervious Runoff = 1.18 cfs @ 12.12 hrs, Volume= 0.085 af, Depth= 6.74" 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 100-Year-Current Rainfall=9.18", P2=3.47" 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) 3.8 20 0.0200 0.09 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 3.47" 0.5 35 0.0200 1.16 Sheet Flow, B-C Smooth surfaces n= 0.011 P2= 3.47" 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 5.3 381 Total Subcatchment 5S: PDA #1 - Undetained Pervious Hydrograph Runoff 1.18 cfs NOAA 24-hr D 100-Year-Current Rainfall=9.18" 1 P2=3.47" Runoff Area=6,562 sf

" Runoff Area=6,562 sf Runoff Volume=0.085 af Runoff Depth=6.74" Flow (cfs) Flow Length=381' Tc=5.3 min CN=80 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)