The Hněvkovice Waterworks, built during the years 1986 to 1991, together with the Kořensko Waterworks, is the newest step in the so-called Vltava cascade.
The primary reason for the building of the Hněvkovice Waterworks was the need to provide a sufficient amount of service (cooling) water to the Temelín nuclear power station, which began being built at roughly the same time near Týn nad Vltavou. For this purpose, on the 210.39 river kilometre of the Vltava, a concrete gravitational dam was built that is 191 metres long, 27 metres high and 9.5 metres wide at the crown. It is equipped with three 12-metre wide crown overflows, which have a capacity of up to 3 x 337 m³ of water per second. The volume of retained water at the elevation of 370.1 metres above sea level amounts to 21.1 million m³, and the length of the backwater is 18.5 km.
The Hněvkovice Dam is equipped with a lock for boats having a displacement of up to 300 tonnes. However, currently (2009), the lock is not completed from a technological point of view. A reinforced road on the right bank is intended for smaller boats and recreational crafts. It enables the transport of the crafts between the river levels above and below the dam.
The Hněvkovice Waterworks includes a hydroelectric power station with two Kaplan turbines, each having an output of 4.8 MW. The power station usually generates electricity constantly (without interruption) and sometimes during peak demand.
The building for pumping water to the Temelín nuclear power station, approximately 4 km away, is located on the left bank, just above the dam itself. With regard to the fact that the primary purpose of the Hněvkovice Waterworks is the supply of cooling water for the Temelín nuclear power station under all hydrological situations, the handling rules of the dam do not allow the water level in the reservoir to drop below 365 metres above sea level.
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