The flow control function of a flood retention reservoir is taken care of by two double-controlled conical vortex valves. The nozzle diameters of these valves are 900 mm, the diameter of the vortex chamber being 2700 mm. The rate of the outflow to be controlled is up to 8 m3/s. The valves were installed in the spring of 1980 and will be put into service in 1981. Their purpose is to protect a town from floods caused by bad weather.

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