City of Morgan Hill Sewer System Master Plan 2017

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

Rainfall-Dependent Infiltration Results Summary Table 11 summarizes the calculated average RDI flow rate during the low-flow hours immediately following the rainfall event (refer to the I/I Methods section for more information on RDI analysis methods and ranking methods). Basins that ranked 1, 2 or 3 in a category are color coded red.

Table 11. Basin RDI Analysis Summary

Metering Basin

ADWF (mgd)

RDI Rate (mgd)

RDI per Acre (GPAD)

RDI per ADWF

Overall RDI Ranking A

28 (4) B

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

0.023

12% (4)

4

0

0 (T7)

0% (T7)

T7

0.029 0.014 0.051

85 (1) 17 (5) 63 (2)

16% (3)

3 5 2

6% (5)

19% (2)

0 0 0 0

0 (T7) 0 (T7)

0% (T7) 0% (T7)

T7 T7

Basin 7/8

Basin 7 Basin 8

0.24 0.16

0 0

0% 0%

Basin 9 Basin 10 System

0.13 0.12 2.65

0.040 0.002 0.210

37 (3)

30% (1)

1 6

4 (6)

1% (6)

22

8%

A Ranking of 1 represents most RDI after normalization. B The number in parenthesis shows the ranking within the individual Category.

The following RDI analysis results are noted:  Basins 3, 5 and 9 ranked highest for normalized RDI contribution.

Figure 24 shows bar graph summaries of the RDI analysis. A temperature map by overall ranking is shown in Figure 25.

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