The Cincinnati Water Works' Unidirectional Flushing Program: Pilot Program Results and Alternative Approaches for Full-Scale Implementation - Cossins, Faye;Hartman, David J.;Smith, Gardell;Merz, Rick;DeMarco, Jack

AWWA 51742 - The Cincinnati Water Works' Unidirectional Flushing Program: Pilot Program Results and Alternative Approaches for Full-Scale Implementation
ISBN: 1583210733

December, 2000

American Water Works Association

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Includes 11 references, tables, figures







Vendor Note: Discolored water is the most common water quality complaint for most utilities. At the Cincinnati Water Works (CWW) of Cincinnati, Ohio, over 80% of customer water quality complaints are related to discolored, rusty water. To minimize discolored water and customer complaints, the CWW performed high velocity unidirectional flushing (HVUDF) in three selected areas of the distribution system known to have chronic rusty water problems. As part of these HVUDF pilot programs, water quality parameters directly related to rusty water were monitored before and after flushing to determine the effectiveness of the HVUDF in improving water quality. These parameters included turbidity, color, and iron. Heterotrophic plate count and residual chlorine levels were also monitored to determine the effectiveness of HVUDF in providing additional benefits such as an improvement in microbial quality and a reduction in chlorine demand in the pilot areas. Customer rusty water complaints were monitored throughout the study as well to determine program effectiveness. This paper presents the results of CWW's pilot HVUDF program.

Keywords :Flushing;Heterotrophic Plate Count;Iron;Distribution Systems;Velocity;Chlorine Demand;Turbidity;Color;Residual Chlorine;Hydraulics;Water Quality Monitoring;Cincinnati, Ohio