One of the most common reasons for thermal pollution in rivers are discharges of heated water from all kinds of technical facilities (mostly power plants). Increasing human care for the environment and water quality has resulted in a number of regulations concerning newly constructed objects of this type. Environmental Impact Assessment (EIA) is required in many countries and frequently, among others it consists in the prediction of a possible increase in the water temperature, caused by discharges of hot water and the analysis of various possible variants of that discharges under different hydrological and meteorological conditions. The preparation of predictions of this type is not at all an easy task. Usually in such practical applications we have to deal with lack of sufficient information and input data. Often the execution of necessary measurements is difficult and/or too expensive. Therefore, we are forced to prepare forecasts based on a limited data.
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