City of Morgan Hill Sewer System Master Plan 2017

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City of Morgan Hill Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study

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.

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

3.17

3.03

Typical Design Threshold

2.95

2.93

2.73

2.60

2.49

2.45

1.98

1.92

Peaking Factor

Site 1

Site 2

Site 3

Site 4

Site 5

Site 6

Site 7

Site 8

Site 9

Site 10

Harding

Surcharge Threshold

Typ. Design Threshold

0.88

0.71

0.66

0.62

d/D Ratio

0.50

0.42

0.40

0.39

0.32

0.21