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 6 Summary for Subcatchment 1S: EDA #1 - Impervious Runoff = 1.69 cfs @ 12.10 hrs, Volume= 0.127 af, Depth= 3.85" Routed to Link 1L : 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 (ac) CN Description * 0.396 98 Impervious Surfaces 0.396 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0100 1.18 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 4.09" 0.2 119 0.0400 10.53 12.92 Pipe Channel, B-C 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 1.6 219 Total Subcatchment 1S: EDA #1 - Impervious Hydrograph Runoff 1.69 cfs NOAA 24-hr D 2-Year-Projected Rainfall=4.09" P2=4.09" Runoff Area=0.396 ac Runoff Volume=0.127 af Flow (cfs) 1

0.396 ac Runoff Volume=0.127 af Flow (cfs) 1 Runoff Depth=3.85" Flow Length=219' Tc=1.6 min CN=98 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)