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 16 Summary for Subcatchment 7S: PDA #1 - Pervious to Bio Runoff = 0.13 cfs @ 12.12 hrs, Volume= 0.009 af, Depth= 2.12" 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 2,178 80 >75% Grass cover, Good, HSG D 2,178 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.8 45 0.0450 0.16 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 4.09" 0.2 29 0.0148 2.47 Shallow Concentrated Flow, B-C Paved Kv= 20.3 fps 0.1 18 0.1180 5.53 Shallow Concentrated Flow, C-D (RIP-RAP) Unpaved Kv= 16.1 fps 5.1 92 Total Subcatchment 7S: PDA #1 - Pervious to Bio Hydrograph 0.14 Runoff 0.13 cfs 0.13 NOAA 24-hr D 0.12 2-Year-Projected Rainfall=4.09" 0.11 P2=4.09" 0.1 Runoff Area=2,178 sf 0.09 Runoff

0.1 Runoff Area=2,178 sf 0.09 Runoff Volume=0.009 af Flow (cfs) 0.08 Runoff Depth=2.12" 0.07 Flow Length=92' 0.06 Tc=5.1 min 0.05 CN=80 0.04 0.03 0.02 0.01 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)