102 Sams -REV 12-02-25 NOAA 24-hr D 2-Year Rainfall=3.42" Prepared by Haler Consulting Printed 04/12/2025 HydroCAD® 10.20-2h s/n 10351 © 2024 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 178S: DA P3 (Pervious)
Runoff = 0.00 cfs @ 24.01 hrs, Volume= 28 cf, Depth= 0.01" Routed to Pond 184P : WQ Infiltration Basin #2
Runoff by SCS TR-20 method, UH=Delmarva, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= NOAA 24-hr D 2-Year Rainfall=3.42"
Area (sf) CN Description
62,973 39 >75% Grass cover, Good, HSG A
62,973 39 100.00% Pervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs)
9.5 100 0.0200 0.18 Sheet Flow, Grass: Short n= 0.150 P2= 3.42"
3.6 216 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps
13.1 316 Total
Subcatchment 178S: DA P3 (Pervious)