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Successful NRW Reduction Experience in China

"Sino French Water is a company created in 1992 between Suez Environnement of France and NWS Holdings Limited of Hong Kong. Sino French Water invests and establishes joint-ventures (JVs) with local water authorities and companies in China to improve the management and operation of water, waste water, industrial water services and sludge treatment. Today there are more than 25 JVs spread all over China and each one with unique characteristics.

Construction of delicate systems to manage water distribution and minimize water losses: endeavors and challenges in Beijing

The rapid population growth in Beijing exacerbates the contradiction between social and economic development and water resource shortage. The provision of sufficient and safe drinking water with reasonable pressure to local residents is the primary goal for Beijing Waterworks Group. The South-to-North Water Diversion Project is valuable to alleviate the water resource crisis in Beijing; however, it is of more importance to minimize water loss in distribution systems and to avoid water waste in daily life for residents.

Guidelines for transient analysis in water transmission and distribution systems

All water systems leak, and many supply systems do so considerably, with water losses typically of approximately 20% of the water production. The IWA Water Loss Task Force aims for a significant reduction of annual water losses by drafting documents to assist practitioners and others to prevent, monitor and mitigate water losses in water transmission and distribution systems. One of the causes of water losses are transient phenomena, caused by normal and accidental pump and valve operations.

Pressure:Bursts Relationships

Pressure:Bursts Relationships: Influence of Pipe Materials, Validation of Scheme Results, and Implications of Extended Asset Life

Case Studies Demonstrate the Implications of Metering Errors

"General anomalies that occur in the management of apparent losses are identified and include determination of apparent loss indicators that fail to take into account both the random and bias errors inherent in metering. Estimating the volume of water losses that could be attributed to meter errors is also incorrectly assumed to be equivalent to the error limits (i.e. envelope) stipulated in standards. Performance indicators that are reliant on flow meter data must be expressed as a range and not as a single value which is common practice.

Tackling water losses through improved domestic water accounts

"The domestic water bills that municipalities send out to consumers on a monthly basis are a key interface between local government and citizens. Being a legal instrument, as well as a communication medium, the consumers' level of understanding of their water bills and the confidence in the information provided is therefore indicative of their effectiveness. A lack of understanding of bills impacts negatively on customer awareness, billability, participation and the regulation of water services.

The Effects of Intermittent Supply on Water Distribution Networks

The world’s population is increasing at a tremendous rate, the world’s renewable water resources are reducing rapidly, the gap between supply and demand is widening with urbanisation and climate change making it even wider. This paper reviews how the Water Board of Lemesos, Cyprus, a water utility with a proven history of managing extremely well its distribution network, was forced due to water shortage conditions to have intermittent supply, providing water 3 times a week for about 12 hours each time.

Methodology for Optimal NRW Program Design

"During 2009-2010, RTI International developed and published a financial model which calculates the financially optimum level of Non-Revenue Water (NRW). The model computes a steady-state target for NRW reduction and control programs, based on site conditions and local costs. The model was presented at IWA Water Loss Specialist Conferences in Cape Town and Sao Paulo and other international meetings. It has been applied in over 30 countries using secondary data, and applied at a more detailed utility-level in Brazil, Jordan, Uganda, and Zambia.

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