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 Volume 101 Number 1
January 2009
ISSN 1551-8833
FEATURE ARTICLESOne perspective on chlorine securityGregory J. Welter The water sector's adoption of two low-cost and straightforward measures could go a long way toward reducing the vulnerability of chlorine to terrorist threats. Water system preparedness and best practices for pandemic influenza Philip Van Atta and Robert Newsad Water utilities should establish partnerships with public health agencies and emergency officials to provide accurate and early warning for pandemic influenza and other diseases. Modeling variable-speed pump operations for target hydraulic characteristics Zheng Yi Wu, Michael Tryby, Ezio Todini, and Thomas M. Walski An enhanced variable-speed pump (VSP) solution method to automatically calculate the relative pump-speed coefficient for attaining the prescribed hydraulic head or the preferred amount of flow can be used to model a single VSP and multiple VSPs with rule-based logic controls. Integrated analysis of NOM removal by magnetic ion exchange Philip C. Singer, Treavor Boyer, Abigail Holmquist, Jim Morran, and Michael Bourke This article compares results from batch-, pilot, and full-scale tests to create a composite picture of magnetic ion exchange process performance, a valuable technology in controlling disinfection by-products and reducing chemical requirements in downstream treatment processes. Comparative study of three types of controllers for water distribution networks M. Prasanna Kumar and M.S. Mohan Kumar The authors describe an alternative controller that combines the nonlinear control technique known as dynamic inversion with proportional integral derivative features to cope with existing control problems in water distribution systems. The Water Library® — Journal articles now free to AWWA members! Submission and Peer Review System
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