Szukana fraza: [Abstract = "The Odra basin includes 362 natura lakes bigger than 50 ha. They are not only important hydrological objects, but also essential components of the water cycle. Their surface area is about 636 km2, and the capacity exceeds 4.7 km3. For comparison the total multiyear mean runoff from the Odra basin lakeland is about 5.7 km3. We must undoubtedly gain some minimum knowledge about the lakes where sustainable management would be planned. The EU Directive recommends that every member country should determine its ecological status of lakes bigger that 50 ha, and gives adequate criteria."]

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