Search for: [Abstract = "Hydrotechnical constructions on the Smortawa river influences on changes of the oxygenic conditions in the water. Between April 1999 and December 2000 there were made measurements of content of oxygen above and below hydrotechnical constructions, in various terms and temperature of the water. Investigations demonstrated the influence of the height of piling up constructions and hydrological regime of the river on the level of oxygen in thewater."]