HomeMy WebLinkAboutScentsy South Campus Drainage Calculations_Page_3_Page_02t-MUJCL 1 . OUCIV I JT LIJU VVAKC L
DATE: 11-11-14
Assumptions for calculations:
Runoff coefficient C = 0.95 for Commercial Site
Intensity25 = 1.4 in/hr
for 1 -hour storm w/ Tc=22.5 minutes
Intensityloo = 1.9 in/hr
for 1 -hour storm w/ Tc=22.5 minutes
100 -year Peak Flow = C * I * A ft3/sec
Runoff Volume = Area of Hydrograph (0.5*Base*Height)
= 0.5 * 1 h storm(3600sec) * (Peak Flow)
Drainage
CB 25 -yr
100 -yr
Runoff
Area (flz)
C -value
Flow(cfs)
Flow
cfs
Volume
W2 AREA 1
12633
0.95
0.39
0.52
942
Trench A
W2 AREA 2
10712
0.95
0.33
0.44
799
Trench A
W2 AREA 3 ROOF
20735
0.95
0.63
0.86
1547
Trench A
W2 AREA 4 ROOF
20735
0.95
0.63
0.86
1547
Trench B
W2 AREA 5
6876
0.95
0.21
0.28
513
Trench B
W2 AREA 6
4221
0.95
0.13
0.17
315
Trench C
CK Engineering, PC
860 Headwaters Dr. Eagle, ID 83616
(208) 869-0590