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AWWA DSS58717
- Establishing Site Specific Flushing Velocities
- Conference Proceeding by American Water Works Association, 10/01/2003
- Publisher: AWWA
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No scientific database is available to guide utilities in determining the appropriateflushing velocity that will create a shear force capable of dislodging and transporting specifictypes of particles, film, or scale. Often, criteria used to decide when flushing is adequate includevisual observation of "clear" water coming from the hydrant, a pre-selected time period(sometimes related to calculations on volume of water displaced), the ability of the zone tomaintain pressure, or samples collected and analyzed for standard water quality analyses. Onsitewater quality analyses may be valid indicators of effective flushing but still leave theestimated velocity, duration, and frequency of flushing to guesswork or generalization.The objective of this project was to determine the range of flushing velocitiesrequired to dislodge and remove various accumulated materials from water distribution mains. Includes tables, figures.
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