nonrevenue water reduction (fabrice-lupo)

8/6/2019 Nonrevenue Water Reduction (Fabrice-Lupo)

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NON REVENUE WATER REDUCTION

IBAGUE – COLOMBIA CASE STUDYand introduction to An Dien – An Phu, HCMC case study

The views expressed in this paper are the views of the authors and do not necessarily reflect the views or policies of the

Asian Development Bank (ADB), or its Board of Directors, or the governments they represent. ADB does not guarantee

the accuracy of the data included in this paper and accepts no responsibility for any consequences of their use.Terminology used may not necessarily be consistent with ADB official terms.

FLUIDIS-WMI is a subsidiary of the French group VINCI,world leader in construction, concessions and relatedservices :

Workforce : 128 000

Net sales : € 19 500 millions

Net income : € 731 millions

Operations in over 80 countries

Presentation of VINCI



Presentation of FLUIDIS-WMI

Since 1989, Fluidis-WMI has specialized in water management

and made a significant impact in this field in 45 countries aroundthe world.

Our expertise lies in optimizing water and sewage networks –both from a technical and commercial standpoint.

Optimization of production and distribution systems

Non Revenue Water Management

Leak Detection Campaign

Optimization of Pressure Management

Measurement Campaign

Master Plan

Hydraulic Network Modelling and ZoningMetering Optimization

Optimization of Customer Services Management

Activities in Water Management :

Capital of “Tolima” Province, Ibaque is located at 4º 27’ of Northern Latitude y 75º 15’ of Western Longitude in thecentral area of Colombia’s andin region.

Localization of Ibague

420 000 Inhabitants (1998)

Average temp. : 23 °C

Average hum. : 72%

1250 m height above sea-level



Scope of the project

This includes :

Verification and Optimization of the NonRevenue Water Calculation

Determination of the Water Balance(breakdown of losses)

Identification and immediateimplementation of short-term solutions

REDUCE NON REVENUE WATER INDICATOR

IN A SHORT-TERM PERIOD

Presentation of Water distribution system

3 Water treatment plants: “La Pola” : 1500L/s + 750 L/s “Chembe” : 75 L/s

11 Reservoirs

Total storage capacity : 33 200 m3

Gravity and pumped system

Network Length: 610 Km

Water coverage : 90%

No. of connexions : 85 700

Official NRW indicator : 63 %



Introduction to Water Balance

NRW = Physical losses + Commercial Losses + Authorised Unbilled Consumption

Methodology 1st alternative

Small measured areas

(2 – 20 km length)

(500 - 3000 properties)

Detailed Design

Instrumentation (+ Telemetry)

Works: -Boundary valves

- Pipes

- Chambers

ZPT – Zero Pressure Test

Operational adjustments

DMA Approach

PRINCIPLE : Quantify losses by night flow measurement in small “artificial” zones



Methodology 2nd alternative

Integral Approach

Measurement of existing Water supply

areas

Both Technical and Commercial

Assessment.

TECHNICAL

COMMERCIAL

PRINCIPLE : Quantify losses by a global assessment of WSC without modifying thewater network

METHODOLOGY

DMAApproach

IntegralApproach

LOWHIGHRISKS / DIFFICULTIES

NOT LIMITEDLIMITEDAREA

SHORT TERMLONG TERMTIME TO OBTAIN RESULTS

HIGHLOWPOTENTIAL OF COMMERCIALLOSSES REDUCTION

LONGSHORTRESPONSE TIME TO BURST

MEDIUMHIGHPOTENTIAL OF PHYSICAL LOSSESREDUCTION

MEDIUMHIGHEFFICIENCY OF LEAK DETECTION

MEDIUMHIGHTRAINING

MEDIUMHIGHCOST OF MAINTENANCE

LOWHIGHCOST OF IMPLEMENTATION

LOWHIGHCOST OF DESIGN

Comparation of alternatives



PLANNING OF WORKS

PHYSICALLOSSES

ACTION PLAN

COMMERCIALLOSSES

ACTION PLAN

INTEGRAL APPROACH

EQUIPMENTS

Insertion-type

Electromagnetic probe

flowmeter

Pressure datalogger

Reservoir level

datalogger

Ultrasonic flowmeter

Equipment Unit

ULTRAFLUX DIGISONIC FLOWMETER 5

ULTRAFLUX MINISONIC FLOWMETER 1

ABB ELECTROMAGNETIC PROBE FLOW METER 1

METROLOG PRESSURE DATALOGGER 15

METROLOG RESERVOI R LEVEL DATALOGGER 3

PSION WORKABOUT POCKET COMPUTER 2

PALMER GMIC ACOUSTIC AMPLIFIER 3

MET RAVI B DF JUNI OR ACOUS TI C AMP LI FI ER 1

PALMER MICROCORR6 ACOUSTIC CORRELATOR 2

PALMER PERMALOG NOISE LOGGER 1

Noise logger

Acoustic amplifier

Acoustic correlator PSION

Workabout



HUMAN RESOURCES (WSC + FLUIDIS staff)

HUMAN RESOURCE UNIT

Project Director 1

Project Manager 1

Hydraulics Expert 1

Water treatment plant Expert 1

Customer Services Expert 1

Leak Detection Expert 1

Pressure Management Expert 1

Measurement technician 4

Invisible leak detection technician 2

Visible leak detection technician 1

Pressure Management technician 1

Customer services Engineer 1

Customer database analyst 1

Customer census technican 1

Workers 10

Drivers 6

Secretary and clerk 2

TOTAL 36

PHYSICAL LOSSES

ACTION PLAN



• Work done :

• Data collection• Inspections

• Schemes drawing

• Measurements

• Review of process

• Results :

• Improvement of water treatmentplants knowledge

• Determination of water balance

• Optimization of process

• Reduction of operational losses

• Reduction of operation expenditure

Assessment of water treatment plants

• Work done :

• 220 flow measurements

– On the total system

– In each district

– On primary network

• 280 pressure measurements

100.00%139,935.171,619.62Total

0.95%1,325.3815.349

4.91%6,868.8079.58

15.85%22,186.66256.797

5.67%7,932.3891.816N

21.62%30,248.64350.16

2.72%3,811.9744.125A

12.74%17,825.18206.315

10.57%14,791.68171.24

8.85%12,383.71143.333

10.20%14,271.55165.182

5.92%8,289.2295.941

m3 / dayl / s

% of production

Flow rateDistrict

Flow and Pressure Measurement Campaign

• Results :• Improvement of network

knowledge

• Low and High pressure zonesdetected

• Air problem detected

• Optimization of network zoning



• Work done• 53 level measurements

• Reservoir input and output volumemeasurements

• Test of tightness

• Inspection of infrastructures

• Cleaning

Reservoirs Assessment

• Results

• Many overflows detected

• Leaks on structures

• Optimization of reservoir operationalmanagement

• Recommendations for the installationof measurement equipments

(CONDUCCIONTANQUEBELENTANQUELA15 TANQUECERROGORDO)

Fecha:13/11/2002al 18/11/2002

0.00

100.00

200.00

300.00

400.00

500.00

600.00

700.00

1 3/ 11 /0 2 00 :0 0 1 4/ 11 /0 2 00 :0 0 1 5/ 11 /0 2 00 :0 0 1 6/ 11 /0 2 00 :0 0 1 7/ 11 /0 2 00 :0 0 1 8/ 11 /0 2 00 :0 0 1 9/ 11 /0 2 00 :0 0

TIEMPO

CAU

DAL

l/s

CAUDALSALIDA TANQUEBELEN

SUMADELASDOS LLEGADASALTANQUEDELA15YCERROGORDO

Leak detection campaign

Invisible leakdetection

Semi-visible andreported leaks

Leak detectioncampaign



• Work done• 5524 inspection reports

• 509.7 Km of water pipes inspected

• 157.3 km of sewage pipes inspected

• Results

• 1263 invisible leaks detected

• 650 semi-visible leaks detected

In addition 148 illegal services detected

Saved volume :

184 L/s

15.811 m3/day

Leak detection campaign

Bulk metering and NRW calculation

• Work done

• Analysis of production and billing data

• Analysis of existing bulk metering

• Results

• Identification of many deficiencies in NRW calculation

– No bulk metering or inadequate metering

– Billing and production periods are not in phase

– Billed volume is not reliable

– Billing period vary from 25 to 45 days

• Installation of bulk meters

• Implementation of a new NRW calculation process : initial

NRW indicator decreased from 63% to 58%



COMMERCIAL LOSSES

ACTION PLAN

Analysis and optimization of customer database

• Work done

• Development of an ACCESS database to analyse existing

database

• Development of statistical reports to analyse the customer data

• Accurate determination of billed volume

• Analysis of customer management procedures

• Results

• Implementation of a reliable and confident NRW calculation

method

• Identification of inexact and not reliable customer management

procedures ( lake of verification of meter reading, inadequate

consumption estimation for customers without reading, abnormal

discount on metered volume etc.)



Customer census

• Work done

• Elaboration of a census methodology

• Elaboration of a complete field survey

• Analysis of reading routes

• Census of 2% of services ( 1436 customers )

• Results

• Identification of database deficiencies :

– Inefficient customer identification

– No database updating

– Inefficient reading routes

– Poor existing data about meter and service conexion– Too much customers with meters are not read

• Improvement and upgrading of customer database

Error curve

-10

-5

0

5

10

1 10 100 1000 10000

Flow rate ( L/ h )

E r r o r ( %

class B meter

classe C meter

Assessment of customer meters

• Work done

• Statistical analysis of customer meter data (from the census)

• Statistical analysis of meter error curves

• Assessment of meter installation and replacement procedures

• Results

• Optimization of meter installation and replacement procedures

• Determination of under-metering



Large consumers special study

• Work done

• Survey of 700 large consumers ( > 300 m3 / month )

• Results

• 0.4% of the customers represent 14% of total billed volume

• Identification of inefficient large consumer management :

– 27 % of the meters are in bad conditions

– 18 % of the large consumers do not have any meter

– No special reading route for large consumers

– No monitoring of large consumers

Final breakdown of losses

Physical losses 45 %

675,259TOTAL

475,990LeaksPipes

21,066OverflowReservoirs

4,500Other losses

45%

173,703Operational lossesWatertreatment plant

Physicallosses

Impact %Vol

m3/monthDescriptionCategory

=



828,443TOTAL

8,738Unjustified DiscountBilling47,292Administrative / State

16,439Compounds

12,509Large consumers

Others

320,632Illegally reconnectedcustomers

63,808By-pass

69,779Other illegal services

169,890Massive illegal services

Illegal services

2,282Reading errors

19,393Average errors

55%

97,681Undercounting meters

Customer meters

Commercial losses

Impact%

Volm3/month

DescriptionCategory

Commercial losses 55 %

Final breakdown of losses

=

5 8 , 4 2 % 5 4 , 5 0 %

5 2 , 2 7 %

5 2 , 7 5 % 5 0 , 0 9 %

5 2 , 3 3 %

5 3 , 8 4 % 5 1 , 6 8 %

5 0 , 1 8 % 4 5 , 8 5 %

4 6 , 3 8 % 4 5 , 1 9 %

4 8 , 8 2 % 4 4 , 4 7 %

4 3 , 6 0 % 4 2 , 0 5 %

4 0 , 4 7 % 3 9 , 1 3 %

1.000

1.500

2.000

2.500

3.000

3.500

4.000

4.500

5.000

5.500

E n e / 0 2

F e b / 0 2

M a r / 0 2

A b r / 0 2

M a y / 0 2

J u n / 0 2

J u l / 0 2

A g o / 0 2

S e p / 0 2

O c t / 0 2

N o v / 0 2

D i c / 0 2

E n e / 0 3

F e b / 0 3

M a r / 0 3

A b r / 0 3

M a y / 0 3

J u n / 0 3

M i l l a r e s

0%

10%

20%

30%

40%

50%

60%

70%

I ANC ( % ) V OLUME NPRODUCI DO M3 V OLUMEN FACTURADO M3

Income of the project

Improvement of operational management

Reduction of OPEX (operational expenditure)

Technology transfer and training of local staff

to continue to reduce losses

Improvement of WSC image

In a short-term period no need to increase

water production (optimization of CAPEX )

Reduction of NRW from 63 % to 39%

Turn-over in less than 12 months

(before the end of the project)



On-going Project – AN DIEN AN PHU pilot zone in HCMC

Initial situation (Feb 2005) :

Network Length : 38 Km

Nb connections : 2567

Input volume : 263 225 m3

Billed volume : 150 752 m3

NRW (m3) : 112 473 m3

NRW (%) : 42,7 %

NRW (m3/j/km) = 132 m3/j/km

Duration : 8 months

Integral approach applied to a pilot zone

New Project – AN DIEN AN PHU pilot Zone in HCMC

Planning of works



THANK YOU FOR YOUR ATTENTION

HAVE A NICE DAY

Contact in Vietnam : [email protected] : 0 919 170 841 Tel/Fax : 8 899 29 10

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