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Table 3.1 Sewer System Performance and Design Criteria
Sewer System Master Plan
City of Morgan Hill
PRELIMINARY
Pipeline Criteria
Peak Dry Weather Flow Criteria
Maximum Allowable d/D
Existing Trunks
Proposed Trunks
0.90
0.75
0.90
0.75
Peak Wet Weather Flow Criteria
Hydraulic Grade Line (HGL) should be at least
3 foot
below the manhole rim
Pipe
Minimum
Size
Grade
(in)
(ft/ft)
(mgd)
(cfs)
8
0.0026
0.36
0.55
10
0.0019
0.56
0.87
12
0.0015
0.79
1.23
15
0.0011
1.28
1.98
18
0.0009
1.78
2.75
21
0.0007
2.43
3.76
24
0.0006
3.27
5.05
27
0.0005
4.18
6.47
30
0.0004
5.13
7.94
33
0.0004
6.04
9.34
36
0.0004
7.61
11.78
42
0.0003
10.27
15.90
1/7/2016
Capacity
(n = 0.013)
Diameter
(in)
8 to 12
> 12