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.

12-0248 AEG CofMorganHill FM Rpt.docx

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