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CostView Analysis Reports
REPORT 1
As can clearly be ascertained from
Report 1, 50% of the total I&I is
contributed by Sub-Systems 1 and 7.
I&I CONTRIBUTION ANALYSIS
DELTA Q CALCULATION SUB-SYSTEMS 1 - 8 (APRIL 1 - JUNE 30 2009)
Sub-System
1
2
3
4
5
6
7
8
Sewer
Length
(Ft.)
20,000
19,000
22,000
21,000
20,000
24,000
18,000
20,000
Pipe
Diam.
(In.)
12
10
8
12
15
18
10
8
Avg. Dry
Day Level
(% Full Pipe)
25%
25%
25%
25%
27%
28%
30%
25%
Avg. Dry+Wet
Day Level
(% Full Pipe)
33%
31%
27%
27%
29%
30%
43%
26%
DELTA Q
Avg. Change in Volume
Due to I & I
1.67
1.52
1.21
1.14
1.15
1.16
1.95
1.10
REPORT 2
If only 50% of the I&I discovered in
Sub-Systems 1 and 7 is eliminated, a
municipality will realize annual savings
of $83,000, or $830,000 over a ten year
period. By eliminating the same percentage
of I&I generated by all 8 Sub-
Systems, taxpayers will see a decrease in
their wastewater treatment charges of
$1,545,000 over the same ten year period.
I&I CONTRIBUTION ANALYSIS
VOLUME & COST CALCULATION SUB-SYSTEMS 1 - 8 (APRIL 1 - JUNE 30 2009)
Sub-System
1
2
3
4
5
6
7
8
Residents
Served 1
1120
1050
910
1121
1400
1680
980
840
Avg. Dry
Day Volume
(Gallons/Day)
78,800
73,000
64,000
83,000
98,000
118,000
68,000
59,000
Avg. Dry+Wet
Day Volume
(Gallons/Day)
131,000
110,000
77,000
95,000
113,000
136,000
133,000
65,000
Avg. Cost/Year
Avg. Cost/Day
($) 2 ($) 2
Due to I & I Due to I & I
$202
$144
$50
$46
$58
$70
$252
$23
$74,000
$53,000
$18,000
$17,000
$21,000
$26,000
$92,000
$8,000
REPORT 4
Further isolation of I&I on a 10 Mini-
System basis is now separately
conducted for each of the major Sub-
Systems (1&7) having contributed the
highest percentages of extraneous flow
as identified by Reports 1 & 2. Repeating
the identical procedure as previously
employed within each major Sub-System,
iTrackers continuously monitor both dry
and dry/wet day wastewater levels within
each 10 manhole Mini-System. Since the
goal has been set to initially eliminate only
50% of the total I&I within Sub-System 1
(50% of $74,000), then according to
Report 4, the volume in question is
located somewhere between manhole 30
and 50 (Mini-Systems D&E). Prior to
instituting camera surveillance equipment,
the investigation can now be narrowed
down even further by repeating the above
process for Mini-Systems D&E.
I&I CONTRIBUTION ANALYSIS
VOLUME & COST CALCULATION MINI-SYSTEMS A - F (OCT. 1 - DEC. 31 2009)
Mini-System
A (MH 1-10)
B (MH 10-20)
C (MH 20-30)
D (MH 30-40)
E (MH 40-50)
F (MH 50-60)
Residents
Served 1
187
192
182
178
199
188
Avg. Dry
Day Volume
(Gallons/Day)
13,090
13,440
12,740
12,460
13,930
13,160
Avg. Dry+Wet
Day Volume
(Gallons/Day)
16,088
15,437
14,751
34,458
31,924
18,158
1
Using survey data from local records and the EPA, USGS and the AWWA, one can quickly ascertain the number of
homes being serviced by each Sub-System, the average number of individuals per household within that Sub-System,
the daily water usage per average household (the EPA, USGS and AWWA have all confirmed that average daily water
usage by an individual in the United States is 70 Gal/Day) and the municipality’s wastewater treatment rate per 1000
gallons. Once these figures are imported into the CostView software program, reports are generated describing each
Sub-System by actual increases in volume and cost due to inflow and infiltration.
2
Average National Wastewater Treatment Rate (2007): $3.88/1000 Gal. (NUS Consulting Group)
Avg. Cost/Year
Avg. Cost/Day
($) 2 ($) 2
Due to I & I Due to I & I
$11.60
$7.75
$7.80
$85.35
$69.80
$19.40
$4,234
$2,829
$2,847
$31,152
$25,477
$7,081
7