Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - AJH NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" 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 7S: PDA #1 - Pervious to Bio Runoff = 0.10 cfs @ 12.13 hrs, Volume= 0.007 af, Depth= 1.61" 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-Current Rainfall=3.47", P2=3.47" 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) 5.2 45 0.0450 0.14 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 3.47" 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 5.5 92 Total Subcatchment 7S: PDA #1 - Pervious to Bio Hydrograph Runoff 0.105 0.10 cfs 0.1 0.095 NOAA 24-hr D 0.09 2-Year-Current Rainfall=3.47" 0.085 0.08 P2=3.47" 0.075 0.07 Runoff Area=2,178 sf 0.065

P2=3.47" 0.075 0.07 Runoff Area=2,178 sf 0.065 Runoff Volume=0.007 af Flow (cfs) 0.06 0.055 Runoff Depth=1.61" 0.05 Flow Length=92' 0.045 0.04 Tc=5.5 min 0.035 CN=80 0.03 0.025 0.02 0.015 0.01 0.005 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)