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City of Morgan Hill
Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study
12-0248 AEG CofMorganHill FM Rpt.docx
Page 40 of 46
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 12summarizes 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
Metering
Basin
ADWF
(mgd)
Combined
I/I
(gallons)
R-Value
(%)
Combined I/I
per ADWF
Overall
Combined
I/I Ranking
A
Basin 1
0.19
56,400
0.13%
(6)
B
0.15
(7)
7
Basin 2
0.17
47,200
0.10%
(8)
0.15
(8)
8
Basin 3
0.18
166,200
1.00%
(1)
0.52
(1)
1
Basin 4
0.21
114,100
0.26%
(3)
0.27
(4)
4
Basin 5
0.27
90,900
0.22%
(4)
0.18
(6)
5
Basin 6
0.35
136,300
0.12%
(7)
0.18
(5)
6
Basin 7/8
0.40
230,300
0.63%
(2)
0.33
(3)
2
Basin 7
0.24
177,700
1.31%
0.42
Basin 8
0.16
52,000
0.23%
0.19
Basin 9
0.13
133,300
0.22%
(5)
0.49
(2)
3
Basin 10
0.12
16,400
0.06%
(9)
0.06
(9)
9
System
2.65
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 29shows bar graph summaries of the combined I/I analysis. A temperature map by overall
ranking is shown i
n Figure 30.