The effectiveness of routine spot flushing in two dead-end locations of the Montreal distribution system (DS) was assessed. The two 203 mm (8 in) pipes were roughly 500 m long. Two successive annual spot flushings, 25 minutes each, were performed and the impact on water quality was assessed during the first 24 hours, 2 weeks later, and the following year. The flushing water was also analysed in order to evaluate the quantity and nature of loose deposits that were drained. High numbers of atypical coliforms were removed during the first annual flushing procedure. No atypical coliforms were recovered from the flushing water during the second annual procedure, suggesting that the first procedure was effective in eliminating these organisms. During the first 24 h after flushing, chlorine decreased rapidly at both dead-end locations while heterotrophic plate counts (HPC) counts increased during the same period. Therefore, only minor improvements in water quality (mainly turbidity and total iron) were measured during the two weeks after the flushing procedure. With respect to spot flushing dead-end locations on a routine basis, the principal benefits observed in this specific DS were related to short-term improvements in the aesthetic characteristics of the distributed water.
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September 2005
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
September 01 2005
Dead-end flushing of a distribution system: Short and long-term effects on water quality
Benoit Barbeau;
1École Polytechnique de Montréal, Industrial Chair on Drinking Water, Civil Engineering Department, Environment, PO Box 6079, Succursale Centre-Ville, Montreal, Quebec, Canada, H3C 3A7
Tel: (514) 340-4711 ext. 2988, Fax: (514) 340-5918; E-mail: [email protected]
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Karine Julienne;
Karine Julienne
1École Polytechnique de Montréal, Industrial Chair on Drinking Water, Civil Engineering Department, Environment, PO Box 6079, Succursale Centre-Ville, Montreal, Quebec, Canada, H3C 3A7
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Annie Carriere;
Annie Carriere
1École Polytechnique de Montréal, Industrial Chair on Drinking Water, Civil Engineering Department, Environment, PO Box 6079, Succursale Centre-Ville, Montreal, Quebec, Canada, H3C 3A7
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Vincent Gauthier
Vincent Gauthier
2Compagnie Générale Des Eaux, Région Est-Service Technique, 103 Rue Aux Arènes, Metz, 57500, France
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Journal of Water Supply: Research and Technology-Aqua (2005) 54 (6): 371–383.
Article history
Received:
April 28 2005
Accepted:
June 30 2005
Citation
Benoit Barbeau, Karine Julienne, Annie Carriere, Vincent Gauthier; Dead-end flushing of a distribution system: Short and long-term effects on water quality. Journal of Water Supply: Research and Technology-Aqua 1 September 2005; 54 (6): 371–383. doi: https://doi.org/10.2166/aqua.2005.0035
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