Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

24-223 DRAINAGE DESIGN-PROPOSED-UPDATE NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 109 Summary for Subcatchment P3C: P3C- Roof Area Runoff = 0.35 cfs @ 12.00 hrs, Volume= 2,299 cf, Depth= 6.13" Routed to Link P-DP 2 : PROP DP 2 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 10-Year-2050 Rainfall=6.37", P2=4.09" Area (sf) CN Description * 4,500 98 Roof and Amenity Area 4,500 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 52 0.0100 1.03 Sheet Flow, ROOF Smooth surfaces n= 0.011 P2= 4.09" 0.2 54 0.0216 5.51 1.92 Pipe Channel, 8 ROOF DRAIN 8.0" Round Area= 0.3 sf Perim= 2.1' r= 0.17' n= 0.012 1.0 106 Total