water mains Articles
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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 ...
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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 ...
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Data Analysis Isolates Water Main Breaks
To address pipe break problems within its distribution system, Missouri American Water (MOAW) worked with a monitoring and analysis company to find the causes and solutions, ultimately giving the utility valuable insights. MOAW serves approximately 1.5 million customers in Missouri. The utility owns and operates a network serving St. Louis County, as well as portions of St. Charles and Jefferson ...
By Syrinix Ltd
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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 ...
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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 Cleaning Co.; Newark, N.J. Subcontractor: Montana Construction Co.; Lodi, N.J. Pump operation: Sunbelt Rentals ...
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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 ...
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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 ...
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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 to ...
By MB Crusher
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City of Calgary - Case Study
CHALLENGE: PERFORMANCE MONITORING With a water main network that has expanded to reach more than 5000 km, the City of Calgary, Alberta is committed to running a healthy system. In many networks with metallic infrastructure, however, corroded pipes can lead to costly failures, disruptions in service, and unhappy ratepayers. Learn how they have reduced failures by 85% on their systems. ...
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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 ...
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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 ...
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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 ...
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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
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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 ...
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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 ...
By Sanexen
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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 ...
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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 ...
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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 ...
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Three separate water leaks located over a distance of 826m using the AQUASCAN TM2 - Case Study
Introduction Locating leaks on large diameter water mains can be very difficult due to poor sound propagation and increased distances between fittings that can be used to perform correlations from. For a correlator to highlight a potential leak each sensor must be able to receive the signal from that leak. Once a correlation is highlighted it is then down to the software and the user of the ...
By Gutermann AG
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Modelling the potential for water quality failures in distribution networks: framework (I)
The deterioration of water quality can adversely affect consumers' health as well as the aesthetic properties of water (taste, odour, colour). To date, little consideration has been given to the impact of deteriorating (ageing) water mains on water quality as a major decision driver for the renewal/rehabilitation of water mains. The main objective of this research was to identify major ...
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