Page 24 - planning-committee-packet

230550 HydroCAD
Concept HydroCAD-230550 Type II 24-hr 2-yr Rainfall=3.60"
Prepared by Lane Engineering, LLC Printed 5/26/2025
HydroCAD® 10.00-17 s/n 03788 © 2016 HydroCAD Software Solutions LLC Page 5

Summary for Subcatchment 6S: P-3 (Blue)

Runoff = 0.57 cfs @ 11.99 hrs, Volume= 0.034 af, Depth> 1.71"

Runoff by SCS TR-20 method, UH=Delmarva, Weighted-CN, Time Span= 0.10-24.01 hrs, dt= 0.03 hrs
Type II 24-hr 2-yr Rainfall=3.60"

Area (sf) CN Description
10,237 80 >75% Grass cover, Good, HSG D
64 98 Paved parking, HSG D
10,301 80 Weighted Average
10,237 99.38% Pervious Area
64 0.62% Impervious Area

Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,

Subcatchment 6S: P-3 (Blue)

Hydrograph
Runoff
0.6 0.57 cfs
Type II 24-hr
0.55
2-yr Rainfall=3.60"
0.5
0.45 Runoff Area=10,301 sf
Runoff Volume=0.034 af
0.4
Flow (cfs) 0.35 Runoff Depth>1.71"

0.3
Tc=6.0 min
0.25
CN=80
0.2
0.15

0.1
0.05
0
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)

8.13.25 PC Meeting Packet_pg. 22 of 78