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This slide presentation outlines information on unidirectional flushing. Topics covered include: causes of water quality problems in distribution systems; available alternatives to improve water quality; UDF compared to conventional flushing; key elements of a UDF program; UDF development process; defining a flushing area; review and analyze system operation; defining UDF procedures; typical flush group and sequence; utilizing water model; implementing procedures; dechlorination; tracking system performance; and, a case study of the City of Grand Prairie, Texas.