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City of Morgan Hill
Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study
12-0248 AEG CofMorganHill FM Rpt.docx
Page 2 of 46
The following capacity analysis results are noted:
Peaking Factor:
Sites 7 and 9 had peaking factors that exceeded typical design threshold
limits for the ratio of peak flow to average dry weather flow.
d
/
D
Ratio:
Only Site 3 had a
d
/
D
ratio that exceeded the common design threshold for
d
/
D
ratio. None of the flow monitoring sites reached surcharge conditions.
Figure 1 shows bar graphs of the capacity results.
Figure 2 shows a schematic diagram of the peak
measured flows with peak flow levels.
Figure 1. Capacity Summary Bar Graphs: Peaking Factors and Peak
d
/
D
Ratios
2.93
2.45
2.95
2.49
1.98
2.60
3.17
2.73
3.03
2.45
1.92
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Site 1
Site 2
Site 3
Site 4
Site 5
Site 6
Site 7
Site 8
Site 9
Site 10
Harding
Peaking Factor
0.21
0.40
0.88
0.50
0.66
0.71
0.32
0.39
0.42
0.39
0.62
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Site 1
Site 2
Site 3
Site 4
Site 5
Site 6
Site 7
Site 8
Site 9
Site 10
Harding
d/D Ratio
Surcharge
Threshold
Typ. Design
Threshold
Typical
Design
Threshold