3.3. sonede mondher benaich - tunis pilot

2nd AQUAKNIGHT Conference,
21 May 2014, Aqaba, Jordan
Mondher BENAICH - SONEDE1
2nd AQUAKNIGHT Conference
"Water Loss Management in the Mediterranean
Countries:
the AQUAKNIGHT Project Results“
Tunis Pilot Project
Mondher BENAICH, SONEDE
m.benaich@sonede.com.tn

SONEDE :
 The National Water Exploitation and Distribution, SONEDE
was established in 1968
 Since then SONEDE reached significant performance in the
distribution of potable water in Tunisia by private connection.
Performance indicators of SONEDE are:
SONEDE International

Rate of sideboard :
* Urban : 100 %
* Rural : 94.1 %
Number of individual connection : 2.4 million
Network length : 46,000 km
Number of tanks : 1,000
Number of pumping stations : 1,240
Number of treatment plants : 14
Number of stations of brackish water desalination : 4
Network Performance : 82.7 % on the distribution network
SONEDE staff : 7,000
Turnover : 140 million euro
Annual investment : 55 million euro

Therefore:
The experience, the expertise and the trust capital acquired by
SONEDE 's diverse staff as well as the changing needs of both
national and international environment , made SONEDE motivated
to create in 2009 a company called SONEDE International.

SONEDE INTERNATIONAL :
 The Creation of SONEDE International, aims to meet the
increased needs of the international market for skills specialised in
water management.
 It is also an opportunity for society to value and to export:
- Expertise:
- Human potential , in addition to structured, professional and
fruitful experience in various fields

 Characteristics
 Anonymous company with public participation, it has its financial
autonomy and is wholly exporting.
Creation date: September 29, 2009.
Capital: 1 million dinars, or about 500 000 euro
Shareholders :
- 35% SONEDE
- 20% SONEDE staff
- 45% other companies

Skills
Achievements studies:
Technical assistance, institutional and organizational
Help with setting up a tariff system
Monitoring and project supervision
Management of infrastructure and networks of production
and distribution of water
Training in several areas.

Hydraulic & Hydrogeology
Water treatment & Desalination
Environment
Electro-mechanical & Civil engineering
Water Conservation
Chemistry
Statistics, Financial Management and organization
Job Control
Management and network maintenance .

AQUAKNIGHT Tunis Pilot
Project

1- Presentation of the pilot area
1-1 Main characteristics of the pilot area
1-2 The selection criteria of the pilot area
2- Methodology for losses reduction
2-1 Reduction of physical losses
2-2 Reduction of commercial losses
3- Advancement state of project realisation
3-1 Preparatory works
3-2 Necessary equipements for the project
Summary

The pilot area "Gammarth 90" is part of the northern suburbs of Tunis
(Common Marsa). It is located 20 km from the downtown. This area is
limited by forest on the North and by the Mediterranean Sea on the East.
The pilot area is supplied by gravity from a reservoir of capacity 2500 m3
(highest level of water= 90m).
N
Tunisia
1-Presentation of the pilot area

1-1 Main characteristics of the pilot area
Network length: 25.2 km
Area: 2.5 km2
Minimum hill : 10 m
Maximum hill : 90 m
Average pressure : 45 m
Number of subscribers: 1,641
Average daily distributed volume 2,100 m3
Minimum Night Flow MNF: 20 m3 / h

1-2 The selection criteria of the pilot area
• Autonomous Zone : (1,641 subscribers) isolated from the Greater Tunis
network that feeds 650,000 subscribers.
• The pilot area has network maps scanned and georeferenced.
• The pilot area network consists of different types of pipes (asbestos
cement, cast iron and polyethylene : AC, CI, PE).
• The network efficiency of the pilot area is quite low (near 80%).
• Presence of high pressure areas.
• Presence of major consumers .
• The pilot area is near the intervener team offices which facilitates the
monitoring of the project.

Network map of the pilot area

2-1 Reduction of physical losses :
The reduction of physical losses is based on the realisation of the
following:
a. Preparatory works.
b. Quantification of losses and identification of priority areas for leak
detection.
c. Realisation of operations of research and location of leaks .
d. Repair of detected leaks
e. The implementation of new measures after the repair and the
continuation of operations of leaks detection.

The reduction of commercial losses is based on the following :
a) Selection of a test zone containing a sample of 59 subscribers.
b) Installation of an electromagnetic flowmeter at the inlet of the test zone
in order to control the volume of distributed water .
c) Realisation of tests related to the comparison of the volume of distributed
water and billed water by means of the equipments installation and the
replacement of old meters (UFR, new meters, AMR)
d) Determination of replaced meters accuracy; a sample of 20 of the 59
replaced meters will be returned to UNIPA (Italy) to test on a standard
test bench.

Some of the preparatory works are achieved such as the mapping and
the isolation of the pilot area as well as the dividing of the area
according to network branchement .
Some others will be realised like the implementation of pressure
stabilizer in appropriate zone also the operations of leak detection and
repair.
It was estimated the necessary equipement for the project realisation in
addition to the differences between budgets and expenses
3- Advancement state of project
realisation

D1 R2500
R500
Overpressure towards
touristic zone
a. The mapping of the pilot
area has been completed.
Legend
Existant
Projected
Interconnection valve
Boundary valve
Flow meter
Water meter
Pressure Reduction valve

D1 R2500
R500
touristic zone
b. The pilot area was
totally isolated.
Legend
Existant
Projected
Boundary valve
Flow meter
Water meter

D1 R2500
R500
D3
D2
D4
touristic zone
Legend
Existant
Projected
Boundary valve
Flow meter
Water meter
c. The pilot area was divided into
two independent sectors whose
network is branched.

D1 R2500
R500
D3
D2
D4
R
C3
touristic zone
Legend
Existant
Projected
Boundary valve
Flow meter
Water meter
d. A measurement campaign of
the pressure was realised at the
two sectors. It was noted the
need to install a pressure
stabilizer in an area of sector 2,
which will be equipped with a
DN100 meter in the upstream

D1 R2500
R500
D3
D2
D4
R
C3
Sub sector 1-2
C2
touristic zone
C1
Legend
Existant
Projected
Boundary valve
Flow meter
Water meter
e. Sector 1 was subdivided
into two sub-sectors

Equipement designation Quantity
1- Flowmeter
DN100 2
DN50 1
2- Data logger 7
3- Meter DN 100 3
4- Pressure stabiliser DN100 1
5- Leak detection equipements
Correlator 1
Noise recorder 20
6- Test Zone equipements
Meter DN15 72
AMR 72
UFR 70
7- Computer 1
Table1 : Identification of necessary equipements for the
project realisation

Comparison of budget and expenses for May 2014
Designations
(1)Proposed
Budget
(€)
(2)Amount
(€)
Difference
(1) – (2)
4.3 Computer 1 000.00 --- 1 000.00
4.4.3 Customers meters 3 000.00 2258.64 741.36
4.4.4 Automatic meter reading 7 000.00 10 882.58 -3 882.58
4.4.9 Devices for improved flow measurement (UFR) 9 500.00 1755.75 7 744.25
4.4.5 Flow meter 4 000.00 4 709.86 - 709.86
4.4.7 Data logger 6 300.00 7 873.75 - 1 573.75
4.4.10 Leak detection equipment 30 100.00 30 425.00 - 325,00
Pressure reduction Valves (PRVs) 700.00 1 654.25 - 954.25
Water meter 450.00 855.55 - 405.55
Total Equipement 62 050.00 60 415.38 634.62
Table2 : The supply of equipments

Designations
(1)Proposed
Budget
(€)
(2) Amount
(€)
Difference
(1) – (2)
6.9.9 Civil works for valves installation and district setup 20 000.00 11 874.81 8 125.19
6.9.11 Civil works for meters and tanks testing 5 000.00 4 498.38 501.62
6.9.10 Leak detection 5 000.00 --- 5 000.00
6.9.5 Leaks repairs in the district 5 000.00 --- 5 000.00
Total subcontracted services 35 000.00 16 373.19 18 626.81
Comparison of budget and realised expenses
Table3: The supply of works
Total: Equipement+Subcontracted services 97 050.00 76 788.57 19 261.43

The test zone chosen for different tests in order to reduce commercial losses
has the following characteristics:
 It is isolated from the network and has a single point of water supply
 Gravity water supply
 Average pressure: 50 m
 Number of subscribers: 59 domestic subscribers
 Age of meters : between 3 and 14 years
 Nature of pipes : 78% asbestos cement, 22% polyethylene
 Nature of connections: 100% polyethylene
 No water fraud
 No water tanks on the roofs

Presentation of Test Zone

Some preparatory works have been achieved in the test zone :
 Installation of an electromagnetic flowmeter DN50 at the inlet of the
test zone

 Verification of the network sealing before the test , through the
installation of a data logger on the electromagnetic flowmeter.
Minimum Night Flow
MNF = 80 l/h
Flow monitoring at the inlet of the test zone from 27/03/2013
Time (Hour)
Flow(l/h)

 Step 1 : Comparison of distributed volume and billed volume without
any modification on the network
 Starting date: 28/03/2013
 Test completion date : 11/04/2013
 Total billed volume : 668,960 m3
 Total distributed volume : 780,033 m3
 Water loss for 14 days : 111,072 m3
Results of test 1

Flow monitoring from 28/03/2013 to 11/04/2013
V distributed : 780,033 m3
V billed : 688,960 m3
Efficiency : Vb / Vd = 85,8%
Results of test 1

 Step 2 : Comparison of distributed volume and billed volume after
installation of UFR
 Date of installation of UFR : from 12 to 23/04/2013
 Date of starting the test : 24/04/2013
 Date of achieving the test : 08/05/2013
 Total billed volume: 890,081m3
 Total distributed volume: 1003,252m3
 Water loss for 14 days : 113,171m3
Results of test 1

V billed : 890,081 m3
Efficiency: Vb/ Vd = 88,7%

 Test n°1 ; activity 2.5
 Comparison between results of step 1 & step 2
We can see that the installation of UFR has allowed a net gain of 3 points in
the network performance of the test zone:
Efficiency without UFR = 85.8%
Efficiency with UFR = 88.7%

replacement of old meters and with UFRs and AMRs
 Date of replacement of meters : 09/05/2013
 Date of sending the 20 old meters and five new meters: 10/05/2013
 Total billed volume : 1059,675m3
Results of test 1

V billed : 1045,800 m3

removing UFRs
 Date of removing UFRs : 30/05/2013
 Total billed volume : 1199,276m3
Results of test 1

V billed : 1188,000 m3

Conclusion of test 1

The civil works were finished and all equipment are installed.
The data logger are installed on the metering equipment and we have
achieved the sectorisation of the network of the pilot area to guide the
operations of leaks.

Head reservoir Monitoring Flow
Minimum Night Flow = 25m3/h = 600 m3/day

Consumption (2011) 320077 m3
Consumption (2012) 307374 m3
Special users (2011) 12711 m3
Special users (2012) 10223 m3
Average Domestic consumers 302258 m3
Number of dometic consumers 1640
Average daily consumption (domestic) 500 liter / day
Legitime Night Consumption 100 liter / day
Calculation of the LNC

Head reservoir Monitoring Flow
LNC
SU + Leaks
500 l/day

Results of sectorisation :
D1 R2500
R500
D3
D2
D4
R
C3
Sub sector 1-2
C2
touristic zone
C1
R2500 Monitoring Flow
SS 1-1 Monitoring Flow
Av R500 Monitoring Flow

SS 1-1 Monitoring Flow
Biggest Minimum Night Flow = 8 m3/h

The operations of leak research and location was done in the sub sector 1-1
by means of a correlator and noise recorders whose brand is SEWERIN

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