Strengthening knowledge and discussing latest - IWA

Chair: Bambos Charalambous
Strengthening knowledge and discussing latest thinking
09:15 – 10:15
Activities of the Water Loss Specialist Group around the World - Bambos Charalambous
Strategise to further influence governments around the world to introduce national laws and regulations that will require water utilities to implement NonRevenue Water (NRW) reduction programs adopting the IWA WLSG methodologies and practices.
09:15 – 10:15
Workshop Part I
What is happening to reduce water losses in my part of the world?
Breakout Session
Australia - Ian Maggs
Challenges faced and results achieved in water loss control reduction in
UK - Stuart Hamilton
A brief overview of water loss reduction technologies being used in the
UK and internationally focusing on recent developments to assist in
NRW field activities
USA - Reinhard Sturm
An overview of where the industry stands on water loss and the
obstacles it faces in the USA in view that several states and regulatory
agencies are now requiring water utilities to report their water audits
on regular bases
South Africa - Niel Meyer
Benchmarking non-revenue water in 132 municipalities, guidelines for
reducing water losses in municipalities and a standardised approach for
the preparation of water demand management strategies in South
Africa as well as the water supply deficit and the need for water
conservation in the industrial heartland.
Introduction to the IWA Water Loss Control Strategies
Niel Meyer
This breakout session will cover the following:
 IWA Water Balance: - Water balance terminology and
example of completed water balance.
 Infrastructure leakage index (ILI):- Theory and
calculation of ILI as a water loss indicator.
 Introduction to Water Loss Reduction Activities:Pressure Management, Active Leakage Control, Asset
Renewal and Replacement.
10:45 – 13:00
Workshop Part II
Dealing with the complex interrelation of intermittent supply and water losses
In many world regions Intermittent Water Supply (IWS) systems are prevalent. IWS systems can be defined as piped water supply service that is available to
consumers less than 24hs per day. In an IWS situation, the consumers usually secure their water supply through the use of ground or roof tanks, where water is
stored during the length of time that the supply is provided. In the workshop issues pertaining to the numerous problems associated with management and
operation of distribution networks under IWS as well as the critical challenges entailed in moving to 24/7 will be presented and discussed
10:45 – 11:05
Introduction to IWS and the IWA IWS Task Group – Bambos Charalambous
The challenge of managing a water supply system that is intermittent and with high levels of NRW poses water utility managers with a conundrum regarding how to
address these. This presentation will highlight the many challenges faced by utilities in an IWS situation such as, large fluctuations in pressure, increased difficulties
in detecting and fixing leaks, water supply contamination and associated public health issues. The IWA Strategic Council recognised the importance of intermittent
water supply and formed a Task Group with specific mandate to look into this issue, details of which will also be presented.
11:05 – 11:25
The concept of Non-Revenue Water in IWS – Fabio Garzon Contreras
Although there is a generic approach for quantification and management of NRW based on IWA best practices, their application to intermittent water supply
systems poses great challenges to practitioners. Based on actual cases in Latin America, this presentation will focus on two very important aspects of IWS that could
be considered the root cause of this situation: consumption patterns and pressure dependent behaviour of the demand (consumption and leakage) and their
effects on NRW. A model which considers the effect on consumption and leakage due to increasing time of service and service pressure for different types of NRW
interventions and the results obtained from a case study in Colombia will be presented.
11:25 – 11:45
Experience of Intermittent Water Supply in India – Anand Jalakam
An overview of the current IWS situation in India will be given as well as the problems faced, the efforts being made to rectify the situation and the results achieved
in transitioning from IWS to 24/7 in a cost effective manner, highlighting the importance of issues such as improved operations and maintenance procedures,
improved quality of materials and workmanship, targeted pipe replacement and Active Leakage Control
11:45 – 12:05
Experiences of Intermittent Supply in Africa – Harrison Mutikanga
This presentation will provide insight and experiences in tackling Non-Revenue Water (NRW) in African Water Utilities under intermittent water supply conditions.
African water utilities provide water irregularly from twice a week in severe conditions to an average of 18 hours per day in most utilities. The findings indicate a
strong likelihood between intermittent water supply and high levels of NRW. This relationship means that conventional approaches for NRW reduction may not be
effective in water distribution systems where water is heavily rationed and there is need to explore new methods of NRW reduction
Thoughts on the Way Forward from IWS to 24/7 – Jan Janssens
The way forward moving from intermittent to continuous supply needs to address three elements in parallel in order to have sustainable impact:
 Technical - gradual reintroduction of continuous service, metering, sectorization, rehabilitation;
 Financial - tariff structures linked to performance incentives, restoring service to 24-hour supply demands the reform of utilities to make them
accountable, recover costs and adopt a commercial thinking;
 Institutional - all water utilities that have fallen into intermittent supply have major governance and incentive flaws and need in-depth reform; moving to
continuous supply requires often very difficult political and institutional choices that many cities prove reluctant to make
Questions & Answers / Discussion
12:05 – 12:25
12:25 – 13:00