Author(s): H. Robert; David Ogilvie
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Keywords: No Keywords
Abstract: Results of a combined field, laboratory, and computer modelling study are presented for a small water supply reservoir. The normal wi thdrawal policy used only the mid-level offtake and caused a sharp thermocline to develop below the offtake level, accompanied by anoxic conditions in the hypolimnion. Use of only the bottom offtake dramatically altered both the thermal and water quality regimes of the reservoir. The criterion for the ef fectiveness of selective wi thdrawal as a management tool is that the residence time, defined as reservoir volume divided by average outflow rate, must be less than the time during which the reservoir is stratified, and less than the time for depletion of dissolved oxygen in the hypol imnion.
Year: 1985