Appendix F

Table F.1. Distribution system infrastructure information for nonproblematic utilities

Characteristics

Utility II

Utility III

Utility V

Utility VII

Infrastructure variables

Utility age, years

28

90

24

26

Storage tanks

1

2

2

2

Storage tanks capacity, m3

681

2 x 454

2 x 1702.5

2 x 567.5

Average storage time in tanks, h

24

24

72

48

Grey iron pipes, %

0

5

0

0

Ductile iron pipes, %

95

0

90

100

PVC pipes, %

5

90

10

0

Other material pipes, %

0

5

0

0

Overall utility pipe length, km

12

10

17.6

3.8

Maintenance variables

Flushing periodicity, per year

2

2

1

2

Annual pipe breakage rate, breaks/100km/year

16

10

0

0

Table F.1. Distribution system infrastructure information for nonproblematic utilities (continued)

Characteristics

Utility II

Utility III

Utility V

Utility VII

Operational variables

Mode of chlorine injection

According to flowrate

According to flowrate

According to flowrate

According to flowrate

Usual residual chlorine checkpoint(s)

Chlorination facility

Chlorination facility

Chlorination facility

Chlorination facility

Frequency of residual chlorine measurement

Once a day

Once a day

Once a day

Once a day

Infrastructure variables

Storage tanks localization

Middle of distribution system

Chlorination facility

Extremity of distribution system

Chlorination facility

Emergency chlorinator

Present

Absent

Absent

Absent

Type of chlorinator

Dosage pump

Dosage pump

Dosage pump

Dosage pump

Localization of chlorinator

Chlorination facility

Chlorination facility

Chlorination facility

Chlorination facility

Maintenance variables

Distribution network flushing

Not uncommon

Not uncommon

Not very common

Not uncommon

Reasons for flushing

As a preventive measure

As a curative measure

As a preventive measure

As a preventive measure

Impact of flushing on water quality

Positive impact

Positive impact

Positive impact

Positive impact

Main break frequency

Not very frequent

Not very frequent

No break so far

No break so far

Distribution main leakage

Negligible

Negligible

Not very significant

Negligible

Table F.2. Distribution system infrastructure information for problematic utilities

Characteristics

Utility I

Utility IV

Utility VI

Utility VIII

Utility IX

Utility X

Infrastructure variables

Utility age, years

61

23

26

41

54

21

Storage tanks

2

1

1

1

1

2

Storage tanks capacity, m3

2 x 681

363.2

1362

572

908

2 x 136.2

Average storage time in tanks, h

48

48

72

12

24

48

Grey iron pipes, %

20

0

0

40

10

0

Ductile iron pipes, %

40

0

80

60

50

10

PVC pipes, %

40

90

20

0

40

90

Other material pipes, %

0

10

0

0

0

0

Overall utility pipe length, km

20

10

7.8

45

10

7.9

Maintenance variables

Flushing periodicity, per year

4

2

1

1

2

3

Annual pipe breakage rate, breaks/100km/year

25

10

38

0

10

0

Table F.2. Distribution system infrastructure information for problematic utilities (continued-1)

Characteristics

Utility I

Utility IV

Utility VI

Utility VIII

Utility IX

Utility X

Operational variables

Mode of chlorine injection

Constant

Constant

According to flowrate

Constant

Manual

According to flowrate

Usual residual chlorine checkpoint(s)

Chlorination facility

Tank and extremity

Chlorination facility

Chlorination facility

Storage tank

Chlorination facility

Frequency of residual chlorine measurement

Once in two days

Once in two days

Once in two days

Once a day

Once a day

Once a day

Infrastructure variables

Storage tanks localization

Chlorination facility

Chlorination facility

Chlorination facility

Midway between source and chlorination facility

Middle of distribution system

Source

Emergency chlorinator

Present

Absent

Present

Absent

Absent

Absent

Type of chlorinator

Dosage pump

Dosage pump

Dosage pump

Dosage pump

Manual chlorination

Dosage pump

Localization of chlorinator

Chlorination facility

Storage tank inlet

Chlorination facility

Chlorination facility

Manually into tank

Source

Table F.2. Distribution system infrastructure information for problematic utilities (continued-2)

Characteristics

Utility I

Utility IV

Utility VI

Utility VIII

Utility IX

Utility X

Maintenance variables

Distribution network flushing

Common practice

Not uncommon

Not very common

Not very common

Not uncommon

Common practice

Reasons for flushing

As a curative measure

As a curative measure

As a curative measure

As a curative measure

As a curative measure

As a curative measure

Impact of flushing on water quality

Positive impact

Positive impact

Positive impact

Positive impact

Positive impact

Positive impact

Main break frequency

Not very frequent

Not very frequent

Not very frequent

No break so far

Not very frequent

No break so far

Distribution main leakage

Not very significant

Not significant

Negligible

Not significant

Negligible

Negligible