City of Morgan Hill Sewer System Master Plan 2017

City of Morgan Hill

Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study

12-0248 AEG CofMorganHill FM Rpt.docx

Page 45 of 46

Design Storm Response Summary

The 10-year, 24-hour storm event was applied to the synthetic I/I hydrograph components developed

for each flow monitoring site. This method produces the best estimated response to the design storm

events. These results assume full ground saturation and that the peak I/I flows from the design storm

coincide with peak sanitary flows to produce a “worst-case” scenario of peak wet weather flows.

Table 13 s

ummarizes the final results for the design storm on a site-by-site basis.

Table 13. Design Storm I/I Analysis Summary

Metering

Site

Predicted

Peak Dry

Weather

Flow (mgd)

Predicted

Peak I/I

Rate

(mgd)

Predicted

Peak

Flow

(mgd)

Predicted Total

I/I (gallons)

Site 1

0.34

0.75

1.09

285,000

Site 2

0.58

1.42

2.00

451,000

Site 3

0.56

3.13

3.69

1,134,000

Site 4

0.37

1.02

1.39

279,000

Site 5

1.89

5.26

7.15

2,128,000

Site 6

0.67

1.22

1.89

468,000

Site 7

0.38

2.41

2.80

749,000

Site 8

0.29

0.70

0.99

214,000

Site 9

0.25

1.16

1.40

371,000

Site 10

0.24

0.14

0.39

52,000

Harding

4.46

8.74

13.20

4,075,000