Built from 1962 to 1966, the Dam today serves to compensate for irregular runoff caused by the peak operation of the Vranov Hydroelectric Power Plant, to protect against floods and especially as a reservoir of drinking water for Znojmo and its surroundings. Before the fill-up of the Dam, partial deforestation of the banks and slopes was carried out, the objects of suburban recreation, the picturesque swimming pool, the historical pub “Pod Obří hlavou”, “Trauznický” Mill, 2 bridges and 22 recreational chalets were removed. The length of the flooded area is about 5 km, the largest depth of the lake is approximately 17 meters.