City of Morgan Hill Sewer System Master Plan 2017
City of Morgan Hill Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study
Inflow / Infiltration: Results Inflow Results Summary
Table 10 summarizes the peak measured I/I flows and inflow analysis results for Storm Event 1, which elicited the highest peak I/I response (refer to the I/I Methods section for more information on inflow analysis methods and ranking procedures). Basins that ranked 1, 2 or 3 in a category are color coded red.
Table 10. Basin Inflow Analysis Summary
Peak I/I Rate (mgd)
Peak I/I per Acre (gpd/acre)
Overall Inflow Ranking A
Metering Basin
ADWF (mgd)
Peak I/I per ADWF
286 (7) B 140 (9)
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
1.22 (6) 0.77 (9) 2.55 (1) 1.92 (3) 0.66 (7) 1.61 (5) 1.68 (4)
7 9 1 2 6 5 3
1,334 (1)
500 (3) 219 (4) 295 (6) 878 (2)
Basin 7/8
Basin 7 Basin 8
0.24 0.16
0.57 0.21
2,010
2.36 1.31
434
Basin 9 Basin 10 System
0.13 0.12 2.65
0.34 0.11 2.97
308 (5) 233 (8)
2.50 (2) 0.85 (8)
4 8
312
1.12
A Ranking of 1 represents most inflow after normalization. B The number in parenthesis shows the ranking within the individual Category.
The following inflow analysis results are noted: 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.
Figure 22 shows bar graph summaries of the inflow analysis. Figure 23 shows a temperature map summary of the inflow analysis results per basin.
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