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Distribution Water Quality Issues Related to New Development or Low Usage

Author: Yakir J. Hasit

Publisher: IWA Publishing

Published: 2007-08-14

Total Pages: 116

ISBN-13: 9781843391524

One cause of distribution system water quality problems is from low usage due to new developments or reduced demand. Low usage causes increased water age throughout the system which can lead to a number of water quality problems, including decreased disinfectant residual, sedimentation, increased temperatures, and taste, odor, and color problems. To address these issues and maintain compliance with regulatory standards, utilities have implemented design/construction and O&M based best management practices (BMPs) with varying success. The objectives of this project were to (1) identify water quality changes that occur in the distribution system as a result of low or diminished use areas, in particular, areas of new development with low initial customer usage and established areas undergoing diminished use; and (2) recommend best management practices (BMPs) on minimizing water quality problems in such areas. Utilities must provide potable water to small and large users, new and old developments, and central and remote customers while accounting for changing demographics and demand patterns. In order to maintain adequate water quality and satisfy all of these needs, water utility operators must have the ability to choose sound design and O&M-based BMPs, and defend their decisions. The development of the DST software in this research project allows utility operators to do this by providing a method to compare the costs and benefits of various BMPs and thus make better decisions. The companion CD-ROM contains a decision support tool for selecting the most appropriate BMP for reducing water quality problems due to low usage.

Distribution Water Quality Issues Related to New Development Or Low Usage

Author: Yakir J. Hasit

Publisher: American Water Works Association

Published: 2006

Total Pages: 116

ISBN-13: 1583215131

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Many water utilities deal with water quality problems in the distribution system due to low water usage. This study uncovers the many problems of low usage and reports on the variety of mitigation practices used by North American utilities. An included CD-ROM provides decision support software to help utilities systematically weigh the costs and benefits of a variety of best management practices (BMPs) for mitigating the water quality issues caused by low usage and thus cutting down on customer complaints and higher distribution costs.

Drinking Water Distribution Systems

Author: National Research Council

Publisher: National Academies Press

Published: 2007-01-22

Total Pages: 405

ISBN-13: 0309103061

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Protecting and maintaining water distributions systems is crucial to ensuring high quality drinking water. Distribution systems-consisting of pipes, pumps, valves, storage tanks, reservoirs, meters, fittings, and other hydraulic appurtenances-carry drinking water from a centralized treatment plant or well supplies to consumers' taps. Spanning almost 1 million miles in the United States, distribution systems represent the vast majority of physical infrastructure for water supplies, and thus constitute the primary management challenge from both an operational and public health standpoint. Recent data on waterborne disease outbreaks suggest that distribution systems remain a source of contamination that has yet to be fully addressed. This report evaluates approaches for risk characterization and recent data, and it identifies a variety of strategies that could be considered to reduce the risks posed by water-quality deteriorating events in distribution systems. Particular attention is given to backflow events via cross connections, the potential for contamination of the distribution system during construction and repair activities, maintenance of storage facilities, and the role of premise plumbing in public health risk. The report also identifies advances in detection, monitoring and modeling, analytical methods, and research and development opportunities that will enable the water supply industry to further reduce risks associated with drinking water distribution systems.

Regional Cooperation for Water Quality Improvement in Southwestern Pennsylvania

Author: National Research Council

Publisher: National Academies Press

Published: 2005-04-04

Total Pages: 294

ISBN-13: 0309181313

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The city of Pittsburgh and surrounding area of southwestern Pennsylvania face complex water quality problems, due in large part to aging wastewater infrastructures that cannot handle sewer overflows and stormwater runoff, especially during wet weather. Other problems such as acid mine drainage are a legacy of the region's past coal mining, heavy industry, and manufacturing economy. Currently, water planning and management in southwestern Pennsylvania is highly fragmented; federal and state governments, 11 counties, hundreds of municipalities, and other entities all play roles, but with little coordination or cooperation. The report finds that a comprehensive, watershed-based approach is needed to effectively meet water quality standards throughout the region in the most cost-effective manner. The report outlines both technical and institutional alternatives to consider in the development and implementation of such an approach.

Water for the Future

Author: U.S. National Academy of Sciences

Publisher: National Academies Press

Published: 1999-03-09

Total Pages: 243

ISBN-13: 030906421X

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This book is the result of a joint research effort led by the U.S. National Academy of Sciences and involving the Royal Scientific Society of Jordan, the Israel Academy of Sciences and Humanities, and the Palestine Health Council. It discusses opportunities for enhancement of water supplies and avoidance of overexploitation of water resources in the Middle East. Based on the concept that ecosystem goods and services are essential to maintaining water quality and quantity, the book emphasizes conservation, improved use of current technologies, and water management approaches that are compatible with environmental quality.

Envisioning the Agenda for Water Resources Research in the Twenty-First Century

Author: Water Science and Technology Board

Publisher: National Academies Press

Published: 2001-06-19

Total Pages: 59

ISBN-13: 9780309076630

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In this century, the United States will be challenged to provide sufficient quantities of high-quality water to its growing population. Water is a limiting resource for human well-being and social development, and projections of population growth as well as changing social values suggest that demands for this resource will increase significantly. These projections have fueled concerns among the public and water resources professionals alike about the adequacy of future water supplies, the sustainability and restoration of aquatic ecosystems, and the viability of our current water resource research programs and our institutional and physical water resource infrastructures. With the goal of outlining a roadmap to guide policymakers, the Water Science and Technology Board (WSTB) held a series of discussions at several of its meetings in 1998-2000 about the future of the nation's water resources and the appropriate research needed to achieve their long-term sustainability. From those discussions, the board produced this report, the objectives of which are to: draw attention to the urgency and complexity of water resources issues facing the United States in the twenty-first century; broadly inform decision makers, researchers, and the public about these issues and challenges; identify needed knowledge and corresponding water resources research areas that should be emphasized immediately and over the long term; and describe ways in which the setting of the water research agenda, the conduct of water research, and investments devoted to such research should be improved in the next few decades. This report discusses major research questions related to the critical water issues that face the nation. It lays out an interdisciplinary research portfolio for the next 20 years and recommends agenda-setting processes that can maximize the nation's ability to prioritize and conduct water resources research.