Experience with NRW Reduction of Water Utilities
Alexander Goertz
Dorsch International Consultants
Munich, Germany
NRW Approaches
Top-down
Standard Water Loss
Reduction
Investment Projects
Reduction of Apparent
Water Losses
Service Improvement
Reduction of Real
(Physical) Water Losses
Operations and Repair
Services
Integrated Bottom-up
Approach
Bottom-up
Standard NRW Investment Projects
Scope of Work
Hydraulic network analysis & design
Implementation of network rehabilitation
Drawbacks
Performance indicators either not
defined, not applied or not measured
Focus on water mains
Focus on real losses
Maximum investment, low results
Investment Program Amman,
Jordan
Restructuring and rehabilitation of
distribution networks
Volume: >250 Mio. €
Implementation: 1998 – 2008
NRW Reduction: from 52% to 47%
Service Improvement (Apparent Losses)
Scope of Work
Installation of IT-based customer
management system
Strengthening of customer
Madaba, Jordan
Outsourcing of subscriber
management to private company
Reduce outstanding amounts
Client-Authority:
Project Costs:
Add. Revenue:
Benefits:
Improve water and wastewater
NRW Reduction:
management organization
revenues
from 58% to 45%
0,76 Mio. €
1,50 Mio. €
0,73 Mio €
Operations and Maintenance / Repair Services
Scope of Works
Network zoning for water balance
Flow and pressure metering
Network and customer updating
Hydraulic network optimization
Leak detection and repair training
Pressure management
Ain Al Basha, Jordan
Effective leak detection, repair and
maintenance management
Volume: approx. 0.35 Mio €
Network length: 32km
Implementation: 2007 – 2009
NRW Reduction: from 52% to 30%
Integrating Bottom-up Approach for Effective
and Cost-efficient NRW-Reduction
Scope of Works
Detailed flow and pressure measurement
Network updating (maps)
Network zoning for water balance
Pressure management
Leak detection and repair training
Mobile repair units
Comprehensive Subscriber Survey
Customer Management
Comprehensive NRW
reduction in a pilot zone Zarqa,
Jordan
Investment: approx. 3.8 Mio €
Network length: 160km
Implementation: 2010 – 2012
Envisaged NRW Reduction:
from 50% to 25%
Addressing NRW: a wide spectrum of interrelated activities
Network
Rehabilitation
Assets
Management
Hydraulic
Modelling
Operations
(SCADA/GIS)
Customer
Services
Water
Loss /
Leakage
Control
Maintenance
& Repairs
Conceptional Basis
Administrative and managerial action!
IWA Water Balance
Billed authorized
consumption
Authorized
consumption
Unbilled authorized
consumption
Billed metered consumption
Billed unmetered consumption
Revenue
Water
Unbilled metered consumption
Unbilled unmetered
consumption
Unauthorized consumption
System
Input
Apparent losses
Customer metering inaccuracies
Leakage on transmission and
distribution mains
Water
losses
Real losses
Leakage and overflows at
reservoirs
Leakage on service connections
up to the metering point
Operational and maintenance / repair action!
Non-revenue
water
Dorsch - NRW Approach
Physical Water Loss Reduction
Bottom-up approach
• Technical measures
Demand side orientation
• Process re-engineering
• Vocational training & HR
+
Performance-based approach
Output orientation
+
Administrative / Apparent
Water Loss Reduction
• Subscriber surveys
Effective and costefficient Non-Revenue
Water Reduction
• Managerial measures
• Process re-engineering
The DC approach – based on IWA Water Balance
Key Insights from many NRW reduction campaigns:
Most problems relate to last 25 metres of the system
Customer management drives revenue collection
Establishment of reliable maps (GIS)
Identification of geographic location of all customers
Bulk meters at strategic locations
Leakage control focussed on tertiary network
Improve business procedure of meter readings to
obtain reliable data
A consistent
implementation
of the IWA
Water Balance
is the starting
point for
effective NRW
reduction
Alexander Goertz
Head of Division
Dorsch International Consultants GmbH
Hansastr. 20, 80686 Munich, Germany
Tel.: +49 (0)89 5797-0
[email protected]
bringing visions to life. Dorsch Gruppe.