water loss Articles
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Water Loss UK 2012
In May 2005 a seminar was held at the NEC in Birmingham to introduce the UK water industry to the work of the International Water Association (IWA) Water Loss Task Force. A similar event was held at the NEC Crowne Plaza Hotel in June 2009. Both events were well received and attracted over 100 delegates. Since then the WLTF has become a Specialist Group in IWA due to the importance ...
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Analysis of the net water loss in the main reach of the Yellow River
In this study, several methods were employed to identify water losses in several reaches of the Yellow River. Then, a method for calculating the net water loss was developed. Also, annual, decadal and seasonal net water losses were analysed for the main reach of the Yellow River. Net evaporation, seepage and transmission per unit length of the river were estimated. The results showed that in the ...
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Tackling water loss
Water loss through leaks and non-revenue water are a global issue of monumental scale. A 2018 Consumer Council for Water report revealed that in England alone more than three billion litres of water are lost from leaking infrastructure every day, making water leakage the number-one concern for UK water utilities’ customers. Despite significant manpower-driven efforts to reduce leakage, it ...
By Gutermann AG
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Assessment of water loss in Harare, Zimbabwe
A major challenge facing water utilities is the high level of water losses, which affects the financial viability and adequacy of water in the system. A study was carried out from January to May 2012 to characterize water losses in selected areas of Harare, Zimbabwe. Assessment of the contribution of water leakage to total water loss was carried out through water audits in four selected ...
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Finding the Invisible Leak - Case Study
How Elk Grove Village is Now Detecting the Previously Undetectable Overview: Large surfacing leaks become very obvious, very quickly. A street floods. A pond appears in a field. Crews mobilize quickly to make repairs. We measure water leaks in gallons-per-minute (GPM). But the more critical companion variable is "run time." Reducing water loss is as much about finding the minor leaks that ...
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Automated determination and evaluation of water losses in water distribution systems
Using conventional methods and tools for determining detailed zonal water balances and performance indicators involves considerable efforts in manual data collection and processing. Hence, water balances mostly are determined for a whole network only. Unmetered components are often neglected or based on rough estimates. This article presents an approach to the automated determination of zonal ...
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A model to simulate leakage through joints in water distribution systems
The water loss is a phenomenon frequently observed within water distribution systems. A considerable part of water losses occurs either because of the incorrect assembly of joints or because of the fatigue and ageing of the material used to ensure a watertight seal. Moreover, such a leakage is very difficult to detect and to assess. In this work, we present a novel formulation for modelling the ...
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Bayesian modelling for water loss management decisions
Bayesian networks and their associated methods are especially suited for capturing and dealing with uncertainty. They can be successfully applied both in engineering sciences and in reliability analyses of water distribution systems. In this paper we propose an interactive Bayesian network and a decision-theoretic system which intend to monitor water loss, predict likely outcome and select ...
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Detecting leaks through AMR data analysis
Automatic meter reading (AMR) provides real-time consumption data, enabling to collect a huge amount of information about daily, even hourly, consumptions. It is then easy to assess lost volumes on the network, using supplied volumes information. However, because of the multiple components of water losses, the metering and calculation inaccuracies, the occurrence of new (detectable) leaks is ...
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Introducing pressure and number of connections into water loss indicators for French drinking water supply networks
In France, the system of performance indicators defined within the relevant regulations does not include indicators relating to pressure, or the number of connections. So, Irstea and Veolia Water decided to create a new system of water loss indicators designed for use in France and that would take into account these parameters. The study was initially carried out at District Metered Area (DMA) ...
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Strategic Planning for Water Loss Reduction with Imprecise Data
Water utilities particularly in the developing countries continue to operate with considerable inefficiencies in terms of water and revenue losses. With increasing water demand and scarcity, utilities require effective strategies for optimum use of available water resources. Often the information needed for strategic planning is inadequate and decisions have to be made on the basis of limited and ...
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Comparing Leakage Performance using the Frontier Approach
The choice of the most appropriate indicator to use to compare leakage performance between companies or zones has been the focus of much research and study. The IWA Water Loss Task Force made recommendations (Lambert, 2000) about standardising the terminology and the water balance and then went on to show the short comings of some performance measures. It introduced the concept of the unavoidable ...
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Using performance indicators as a water loss management tool in developing countries
Water utilities in developing countries are facing the challenges of substantial water losses in their water supply systems. In order to deliver water to their customers more efficiently and effectively, utilities must be able to measure and assess the performance of their water supply systems against set management objectives. However, water loss assessment is still not widely practised in ...
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Insertable Valve Network Provides OngoingSolution to Water Loss
Orange Cove, CA - As the only city in Fresno County that is completely dependent on surface water, the City of Orange Cove had 40% unaccounted for water loss when Bill Little, former City Manager returned to Orange Cove to address the community’s growing water problems... “Our goal is to reduce unaccounted for water loss in Orange Cove down to 3% - 5%,” explained Little. “In a city with an old ...
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Construction of delicate systems to manage water distribution systems 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, ...
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Reduction in water losses in water distribution systems using pressure reduction valves
Water loss is a phenomenon frequently observed within water distribution systems (WDSs), that is considerably worsened by an excessive pressure throughout the network. As an alternative option to pipe replacement, the use of pumps working as turbines, throttle control valves (TCVs), or pressure reduction valves (PRVs) can be used to reduce leakage. For a preassigned number of these devices, ...
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Tackling water losses through improved domestic water bills
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 ...
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Malang City Gives a Boost to Aging Infrastructure by Installing Pressure Reducing Valves to Create a Series of District Metered Areas
The Client: PDAM Malang The Challenge: Aging Infrastructure leads to high leakage rates, pipe bursts and insufficient water supply The Solution: 138 S106 2PR-BT ranging in size from 100mm to 500mm The Result: Massive savings in reduced water loss, decrease in pipe bursts and more water to reach more customers. ...
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Singer`s specialty PRV regulates Bangkok pressure - Case Study
Their Challenge With water loss up to 30 per cent, Metropolitan Water Authority (MWA) in Bangkok, Thailand, installed pressure reducing valves throughout the city and its suburbs. The valves controlled nighttime pressures accurately, preventing leaks and breaks. However, in some areas, high demand during the day caused the pressure to drop to 10 psi (0.68 bar) or less. Without sufficient ...
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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 ...
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