City of Morgan Hill Sewer System Master Plan 2017
City of Morgan Hill Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study
Basin Inflow and Infiltration Analysis Results Due to potential cross-connections between basins, the I/I results for Basins 7 and 8 are shown together, labelled “Basin 7/8”. The individual results for Basin 7 and 8 are presented as sub-headers and for informational purposes only to be used at the reader’s discretion. Table 2 summarizes the flow monitoring and I/I results for the nine flow monitoring basins that were isolated during this study. Infiltration and inflow rankings are shown such that 1 represents the highest infiltration or inflow contribution and 9 represents the least. Basins that ranked 1, 2 or 3 in a category are color coded red. Please refer to the I/I Methods section for more information on inflow and infiltration analysis methods and ranking methods.
Table 2. I/I Analysis Summary
Peak I/I Rate (mgd)
Evidence of High GWI?
Combined I/I Ranking
Metering Basin
ADWF (mgd)
Combined I/I (gallons)
Inflow Ranking
RDI Ranking
Basin 1 Basin 2 Basin 3 Basin 4 Basin 5 Basin 6
0.19 0.17 0.18 0.21 0.27 0.35 0.40
0.23 0.13 0.46 0.41 0.18 0.57 0.67
56,400 47,200 166,200 114,100 90,900 136,300 230,300 177,700
7 9 1 2 6 5 3
4
No No No No No No No No No No
7 8 1 4 5 6 2
T7
3 5 2
T7 T7
Yes
Basin 7/8
Basin 7 Basin 8
0.24 0.16
0.57 0.21
52,000
Basin 9 Basin 10 System
0.13 0.12 2.65
0.34 0.11 2.97
133,300 16,400
4 8
1 6
3 9
1,135,500
The following inflow/infiltration analysis results are noted: Inflow: Basins 3, 4, 7/8 and 9 ranked highest for normalized inflow contribution. ♦ If isolated, Basin 7 ranks highly within the Basin 7/8 basin and highly within the collection system. Rainfall-Dependent Infiltration: Basins 3, 5 and 9 ranked highest for normalized RDI contribution. Groundwater Infiltration: Basin 6 had GWI rates that were above the WEF typical low-to- average ratio, indicating excessive groundwater infiltration. Combined I/I: Basins 3, 7/8, 9 and 4 ranked highest for normalized combined I/I contribution. ♦ If isolated, Basin 7 ranks highly within the Basin 7/8 basin and highly within the collection system.
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