This paper describes a model which was developed to simulate the effect of automated liming on the quality of a Welsh lake (Llyn Brianne) and its outflow river. T h e objective was to model the amount of lime required to dose the input streams under a variety of conditions. It was concluded that it would be feasible to install automatic-dosing equipment on the two input streams to deliver sufficient lime to ensure that the pH of the lake and water downstream was controlled at a pH value of 6.0 or greater, thus stabilizing water quality for fish and other aquatic biota.

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