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FEATURE ARTICLES

Water quality considerations for distribution system storage facilities
Jerry Edwards and James Mahr
Water age analysis using sophisticated hydraulic models has identified a consideration that is often overlooked—the storage site.

An analysis of potential costs for small community cross-connection control
Frederick W. Pontius and William B. Evans
The US Environmental Protection Agency is considering regulation of drinking water distribution systems, and one component of this regulation may address cross-connection control programs.

Distribution system on-line monitoring for detecting contamination and water quality changes
Janice Skadsen, Robert Janke, Walter Grayman, William Samuels, Mark TenBroek, Brian Steglitz, and Sumedh Bahl
The authors used a suite of modeling tools to develop a practical and defensible approach to detecting both security-related contamination events and natural water quality changes in drinking water distribution systems.

Effect of water main repairs on water quality
Marie-Claude Besner, Jean Lavoie, Chantal Morissette, Pierre Payment, and Michèle Prévost
This study investigated 16 repair sites of drinking water mains to monitor the effect of main repairs on water quality.

Asset management: Quantifying economic lifetime of large-diameter pipelines
Paul Davis and David Marlow
Many large-diameter cast-iron water pipelines do not have sufficient historical failure data to enable water authorities to confidently predict failure rates. Yet when these mains fail, the costs can be extensive.

Estimating chloramine C x T for the synergistic inactivation of Cryptosporidium with ozone followed by chloramine
Mano Sivaganesan
The author describes a statistical model that can be used to account for the error in estimating the required chloramine concentration times time to inactivate Cryptosporidium oocysts with ozone followed by chloramine in drinking water.

	Inside Insight: Preserving Quality a Key Component of System Operation Tech Talk: New Technology Determines Exact Spatial Location of Water and Sewer Pipes

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