The Brno Reservoir, previously known as the Kníničky Reservoir (Czech: Brněnská přehrada, also known as Prýgl in Hantec slang) is a reservoir on the Svratka River at the northwest edge of the city of Brno, Czech Republic. The construction of a dam on the 56th kilometre of the Svratka River, and the resultant flooding of the river valley containing the village of Kníničky, created the reservoir. The reservoir used to serve as a water reserve for Brno (water from the Vír Reservoir and from wells in Březová nad Svitavou are used today).
Source: Wikipedia