City of Morgan Hill Sewer System Master Plan 2017
City of Morgan Hill Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study
Combined I/I Results Summary Combined I/I analysis considers the totalized volume (in gallons) of both inflow and rainfall-dependent infiltration over the course of a storm event. Table 12 summarizes the combined I/I flow results for the storm event (refer to the I/I Methods section for more information on combined I/I analysis methods and ranking methods). Basins that ranked 1, 2 or 3 in a category are color coded red.
Table 12. Basin Combined I/I Analysis Summary
Combined I/I (gallons)
Overall Combined I/I Ranking A
Metering Basin
ADWF (mgd)
R-Value (%)
Combined I/I per ADWF
0.13% (6) B 0.10% (8) 1.00% (1) 0.26% (3) 0.22% (4) 0.12% (7) 0.63% (2)
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
56,400 47,200 166,200 114,100 90,900 136,300 230,300
0.15 (7) 0.15 (8) 0.52 (1) 0.27 (4) 0.18 (6) 0.18 (5) 0.33 (3)
7 8 1 4 5 6 2
Basin 7/8
Basin 7 Basin 8
0.24 0.16
177,700 52,000
1.31% 0.23%
0.42 0.19
Basin 9 Basin 10 System
0.13 0.12 2.65
133,300 16,400
0.22% (5) 0.06% (9)
0.49 (2) 0.06 (9)
3 9
1,135,500
0.23%
0.22
A Ranking of 1 represents most inflow after normalization. B The number in parenthesis shows the ranking within the individual Category.
The following combined I/I analysis results are noted: 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.
Figure 29 shows bar graph summaries of the combined I/I analysis. A temperature map by overall ranking is shown in Figure 30.
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