Szukana fraza: [Abstract = "This article deals with hydrological morphometric and physicochemical criteria. At the present moment, the state of our knowledge about elements recommended by the EU Directive is slight. Especially hydrological elements are neglected because lake balance surveys in Poland almost are not carried out. Balance data are available only for individual lakes. We do not know either the water exchange time, the flow amount of dynamics, let alone the connection of underground waters with reservoirs. Information on these subjects is only approximate."]

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