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This paper presents the results of an ongoing investigation into the impact of routineoperations such as pump cycling and leak repair on water quality in a specific Canadiandistribution system. This research demonstrates occurrence of intrusion into thedistribution system at full scale. To monitor the impact of pump operation, samplingprotocols involving the use of high-speed pressure data and online particle counters in thedistribution system have been developed. For the repair of pipe leaks, soil and watersamples in the vicinity of the repaired main, combined with sampling of the distributedwater at customer houses and at the flushed hydrants, have been conducted. Resultsindicate that hydraulic transients induced by pump start-ups and stoppages can sometimesinduce a direct response in terms of particle counts. However, the effect is not observedsystematically and the response behavior varies between distribution system locations.For the repair of pipe leaks, evidence of the intrusion of either soil or dirty water duringthe repair work was obtained on one occasion; specifically, an elevated concentration ofaerobic sporeformers was measured in a water sample collected at the hydrant during theflushing operation. Includes 5 references, tables, figures.

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Edition: Vol. - No. Published: 11/15/2004 Number of Pages: 12File Size: 1 file , 3.1 MB