AWWA JAW62059

Even if water quality complies with the most stringentregulations, water distribution systems can neverbe free of particles or microorganisms. Particulatematerials accumulate as loose deposits in distributionsystems as a result of several mechanisms. A number ofadverse effects on water quality are associated with thepresence of loose deposits in networks, including coliformsand consumer complaints.The objective of this article was to evaluate the extentof loose deposit accumulation in distribution systems inthree Canadian cities to determine optimal flushing frequency.In this study, the quantity and nature of loosedeposits removed during unidirectional flushing (UDF)procedures is documented and the role of treated watercharacteristics and network configuration on the rate ofloose deposit accumulation is identified.The collection of data and the analysis of the resultsobtained by UDF was found to be useful to water utilitiesbecause it enables utilities to characterize theefficiency of UDF programs with relatively simple protocols,evaluate the potential adverse effects ofresuspended loose deposits on water quality, and read the current situation of the network. The combinedpractice (flushings and analyzing the procedureeffectiveness) can be a useful tool in the decision-makingprocess of maintenance operations, especially duringthe first years following the implementation of thisoperations and maintenance procedure. Includes 31 references, tables, figures.

Product Details

Edition:

Vol. 97 - No. 9

Published:

09/01/2005

Number of Pages:

11

File Size:

1 file , 370 KB