Water Quality Effects of Aeration/Destratification at Harding Reservoir, W.A.

This report was produced for the Urban Water Research Association of Australia, a now discontinued research program.

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Water Quality Effects of Aeration/Destratification at Harding Reservoir, W.A.

Report no. UWRAA 78

June 1994

Synopsis

Harding Reservoir, located in the tropical region of Western Australia, exhibits natural stratification characteristics which are typical for water bodies in both tropical and warm temperate zones. Such stratification in Harding Reservoir has been associated with water quality complaints by consumers receiving supplies from the reservoir. Turbidity problems have also occurred from time to time due to various factors. To overcome these problems alternative groundwater sources are used during periods of high turbidity(and/or insufficient surface supply) together with artificial destratification by aeration of the reservoir during periods of reservoir use. Since introducing aeration/destratification techniques there have been no major outbreaks of taste and odour complaints from consumers of water supplied from Harding Reservoir.

A study was undertaken during the period January 1988 – June 1990 of the effects of artificial aeration/destratification on the quality of water in the reservoir and on the processes that control that quality. More specifically, the study aimed to clarify the biological, chemical and physical water quality effects of aeration/destratification and when to apply the technique; to increase the understanding of processes that determine water bodies; and to reduce the costs of aeration/destratification through improved design technique and greater understanding of the processes involved. The findings of the study are described in the report.

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