Nonrevenue Water Reduction (Fabrice-Lupo)
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Transcript of 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
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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
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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 %
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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
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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
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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
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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
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• 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
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• 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
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• 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%
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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.)
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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
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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
=
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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)
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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
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THANK YOU FOR YOUR ATTENTION
HAVE A NICE DAY
Contact in Vietnam : [email protected] : 0 919 170 841 Tel/Fax : 8 899 29 10