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26-04-06-15052A-HydroCAD-DLS NY-BLD ADD 15052A 24-hr Si 25-yr Rainfall=4.13" Prepared by Wm Schutt & Associates, P C Printed 4/16/2026 HydroCAD® 10.20-8a s/n 03344 © 2025 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 12S: POST CONDITIONS [49] Hint: Tc<2dt may require smaller dt Runoff 6.56 cfs © 12.01 hrs, Volume= 0.331 af, Depth> 3.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NY-BLD ADD 15052A 24-hr Si 25-yr Rainfall=4.13" Area (sf) ON Description 12,559 98 Roofs, HSG D 1,461 98 Concrete 6,904 98 Asphalt 21,196 96 Gravel surface, HSG D 4,470 80 >75% Grass cover, Good, HSG D 3,493 80 >75% Grass cover, Good, HSG D 50,083 94 Weighted Average 29,159 58.22% Pervious Area 20,924 41.78% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 51 0.0140 0.92 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.50" 1.3 141 0.0120 1.76 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 2.0 98 0.0030 0.82 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 4.2 290 Total Page 430 of 849