Daily measurements of water levels in water reservoir Domaniów were carry out from 2009 to 2013 year. After analyzing date received it was found that correlation between precipitation and water levels in water reservoir. Besides the highest water level in reservoir in all years there were during the spring season and the lowest water levels in reservoir water during autumn season. It results mainly hence, that during the spring is stronger humidity because except precipitation there are also water from melting snow. Whereas in autumn period is water deficit because the summer was strong evapotranspitation and the soil is very dry. The high water levels in reservoir occur also in other month if at the very intensive rainfalls. It will be described below.
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