No scientific database is available to guide utilities in determining the appropriate
flushing velocity that will create a shear force capable of dislodging and transporting specific
types of particles, film, or scale. Often, criteria used to decide when flushing is adequate include
visual 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 to
maintain pressure, or samples collected and analyzed for standard water quality analyses. Onsite
water quality analyses may be valid indicators of effective flushing but still leave the
estimated velocity, duration, and frequency of flushing to guesswork or generalization.
The objective of this project was to determine the range of flushing velocities
required to dislodge and remove various accumulated materials from water distribution mains.
Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 410 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 10/01/2003 |
