Vrané nad Vltavou Waterworks
This is the first and oldest step on the Vltava cascade, built (especially for sailing purposes) during the years 1930 to 1935 on the 71.325 river kilometre of the Vltava.
The Vrané Waterworks, from a water management point of view, is not a dam but a weir, divided by piers into four 20-metre spans that raise the water level by up to 9.7 metres. When released (releasing the dam board), the weir has a capacity of 2,800 m³ of water per second. A road does not lead across the weir.
The Vrané reservoir has a water surface area of 263 hectares, it is 13.4 kilometres long, and reaches to the stilling basin of the dam in Štěchovice. The length of the backwater is 3 kilometres, and reaches to the village of Pikovice, on the Sázava River, a right bank tributary of the Vltava.
The Vrané Waterworks also has two locks, placed next to each other on the left bank. The larger one, designed for rafts and freight vessels, is 134 metres long and 12 metres wide. The smaller one, built for personal transport, has the dimensions of 85 x 12 metres. The transport of small and sports vessels is carried out on a “dry” route via tracks and a cart on the left bank.
Although the Vrané Waterworks was built primarily because of sailing, today it serves primarily for equalising the irregular flows from the Štěchovice and Slapy hydroelectric power stations, for ensuring a minimum water flow rate of the Vltava under the waterworks, and also for the generation of electricity: The hydroelectric power station is located on the right bank and equipped with two Kaplan turbines with an output of 6.94 MW (at a water flow rate of 2 x 90 m³ per second).
In addition to the above-mentioned information, the Vrané reservoir is also a popular and sought-after location for recreation, fishing and water sports.
Weather forecast from Yr, delivered by the Norwegian Meteorological Institute and the NRK