Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment E1B: E1B DISTURBED/PERVIOUS Runoff = 0.11 cfs @ 12.07 hrs, Volume= 728 cf, Depth= 1.10" Routed to Link 8L : EXISTING DISTURBED Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 7,928 72 Woods/grass comb., Good, HSG C 7,928 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.9 25 0.5000 0.22 Sheet Flow, Wooded Woods: Light underbrush n= 0.400 P2= 3.47" 0.5 75 0.0800 2.35 Sheet Flow, Paved area Smooth surfaces n= 0.011 P2= 3.47" 1.4 364 0.0480 4.45 Shallow Concentrated Flow, Parking lot Paved Kv= 20.3 fps 3.8 464 Total