water mains Articles

  • Remediating Unforeseen Sewer Contaminants

    Getting the PCBs out Who: Jersey City, N.J., Municipal Utilities Authority Tons of clean sediment removed: 4,469 Tons of PCB-contaminated sediment: 2,502 Consulting engineer: Boswell Engineering: South Hackensack, N.J. Environmental maintenance contractor: National Water Main ...

  • Planning renewal of water mains while considering deterioration, economies of scale and adjacent infrastructure

    The structural deterioration of water mains and their subsequent failure are affected by many factors, both static (e.g., pipe material, pipe size, age (vintage), soil type) and dynamic (e.g., climate, cathodic protection, pressure zone changes). This paper describes a non-homogeneous Poisson model developed for the analysis and forecast of breakage patterns in individual water mains, while ...


    By IWA Publishing

  • Successful Isolation of 48” Water Main and Backflow Prevention

    Salem, OR When they contacted Hydra-Stop, the primary need for the City of Salem was replacing a section of the existing water mains that were aging and put the City’s water supply at risk. In order to do this they had to isolate the water main from the City’s water system. This 48” line had been in the ground for fifty years. There were significant concerns about the integrity of the pipe and ...


    By ADS Environmental Services

  • A resilience-based prioritization scheme for water main rehabilitation

    Water supply infrastructure in the United States is one lifeline system that is in dire need of huge financial investments to counter pipeline deterioration while keeping up with increasing demands and reliability goals. With decreasing financial resources available to state and local governments, effective decision-making tools for pipeline prioritization are becoming an increasingly integral ...


    By IWA Publishing

  • What Causes Water Main Leaks?

    The number one cause of water leaks today and moving into the future will be the aging infrastructure. “A large part of the US public water system dates back to the years shortly after World War II, therefore, a significant amount of buried infrastructure is at or very near the end of its useful life.” – Qureshi & Shah, Journal AWWA. When aging infrastructure is combined ...


    By EnTech Engineering Company

  • Water Main / Fire Line Rehabilitation

    Problem Dirty brown water and poor water flow were the first clues that a mid-Atlantic commercial property owner had a problem. Then the owner was put on notice by the local fire department that the water supply lines were no longer meeting the required flow requirements. Four hydrants on the owner’s property were flowing between 200 to 300 gallons per minute due to heavy corrosion-induced ...


    By CuraFlo

  • Revisiting the topic of liability for damage due to water main breaks or leaks

    Abstract The topics of liability and negligence as they relate to water main failures are discussed from both a historical and current viewpoint. The historical perspective is provided in a 1948 Journal AWWA article, and we consider changes in liability issues from that time to the present. Case studies from various states are also presented that will provide water utilities insights into ...

  • Risk-based prioritization of water main failure using fuzzy synthetic evaluation technique

    The prioritization of water mains for renewal requires the consideration of their impact on the deterioration of water quality, in addition to their structural integrity and hydraulic capacity. The deterioration of water mains may lead to structural failure that may have grave economic impacts. This paper develops a fuzzy-based decision support system (DSS) to identify the vulnerable locations ...


    By IWA Publishing

  • KEEPING UP WITH TRENCH WORKS – CONNECTING PEOPLE

    When we are not connected we feel isolated. And some remote places are really isolated from the rest of the world. Because there are no roads to get to the districts where secluded people live, no gas pipelines to carry methane for central heating, no water mains, no oil pipelines, no telephone lines and no fiber optics. Today being connected means that it’s a lot easier. It's easier ...


    By MB Crusher

  • A decision support tool for water mains renewal for small to medium sized utilities: a risk index approach

    All over the world water mains are under increasing threat due to aging, aggressive environmental factors, operational factors and inadequate maintenance. Extensive maintenance, repair and rehabilitation practices, or replacement of water mains are required to ensure an acceptable performance of water supply systems. Investment deficit for water system maintenance and rehabilitation has been ...


    By IWA Publishing

  • Got deteriorating asbestos cement water mains?

    Asbestos has come to be one of the most feared words and materials in the world. Yet, in the 1940s, 1950s and 1960s, more than 600,000 miles of asbestos cement– also called transite – used for its light weight, corrosion resistance, rigidity, ease of handling and installation was installed to handle water throughout the United States. Applications included potable water mains, storm ...

  • Is the service life of water distribution pipelines linked to their failure rate?

    This paper aims to enable the relevant use of water main service lifetime and failure data to build a medium or long term infrastructure management plan. Firstly, how to estimate the service lifetime distribution of water mains using observations of decommissioning times which are possibly left-truncated and predominantly right-censored, is shown. Three methods are presented: a non-parametric ...


    By IWA Publishing

  • Resilience-based water main rehabilitation planning in a multi-hazard context

    Due to aging beyond the intended design life, many water mains in the USA are currently deteriorated resulting in an increasing number of failures which challenge water utilities with diminished supply reliabilities, loss of treated water, and numerous other societal issues. Water pipeline systems serving regions that are naturally vulnerable to external hazards, such as earthquakes, pose ...


    By IWA Publishing

  • Effect of seasonal climatic variance on water main failure frequencies in moderate climate regions

    The yearly water main failure frequency is a central performance indicator to describe the structural quality of a water distribution network. Besides age related deterioration, events such as severe climatic conditions or intensified third party construction may cause sudden seasonal increases in failure frequency trends. For the cold regions of Canada and the dry regions of Australia, several ...


    By IWA Publishing

  • Water quality – water main renewal planner (Q-WARP): development and application

    The impact of deteriorating pipes on water quality (WQ) in the distribution network has not been consistently taken into account in decision making related to pipe renewals. In this paper, a detailed modeling approach based on fuzzy cognitive maps is developed using fuzzy rule-based models and fuzzy measures theory to investigate potential of WQ (physical, chemical, and biological) failure in ...


    By IWA Publishing

  • Life-cycle assessment of common water main materials in water distribution networks

    This paper examines the economy-wide environmental impacts linked to the manufacturing of PVC and ductile iron (DI) pipes, steel tanks, and to the generation of electricity for pumping in water distribution network optimization. The non-dominated sorting genetic algorithm (NSGA-II) is used to generate Pareto-optimal solutions of the benchmark ‘Anytown’ network expansion problem. Selected ...


    By IWA Publishing

  • Evaluating the pressure-leakage behaviour of leaks in water pipes

    Much progress has been made over the last decade in understanding the behaviour of flow through leak openings with changes in water mains pressure. In particular it has been established that variations in leak areas with pressure is the main factor responsible for the range of leakage exponents observed in practice, and several numerical and experimental studies have investigated this ...


    By IWA Publishing

  • Risk-based approach to manage aging urban water main infrastructure

    The growing number of challenges in how to manage aging infrastructures, while maintaining a suitable level of service, have become major problems for many municipal water utility companies. As a result, municipalities are increasingly considering the concept of risk assessment and prioritization as the first and an important step that has to be used towards effective asset-management practices. ...


    By IWA Publishing

  • Component-holistic condition assessment of water distribution networks

    The work presented herein presents an expanded methodology for imprinting the condition of an urban water distribution network (WDN). Even though the majority of past research efforts related to WDNs deal with water mains (WMs), only a small part of the research studies have considered house connections (HCs) in the analysis and very few researchers have examined how the failure of pipe ...


    By IWA Publishing

  • Technical Support Team Issues Brief: Water and Sanitation

    This issues brief summarizes main water and sanitation-related commitments made by Member States at Rio+20, different proposals for integrating water and sanitation issues into the Sustainable Development Goals (SDG) framework, and some reflections from the Post-2015 Global Thematic Consultation on Water. ...


    By IWA Publishing

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