 The waterworks on the Danube were designed to have an additional level at Nagymaros, consisting of a reservoir 95 km long and the Nagymaros power plant.This level was to be located between the Hungarian towns of Visegrád and Nagymaros and its purpose was to use the gradient of the reservoir for production of electricity and also to allow ships to pass.The Gabčíkovo works were designed for control and peak running of the power plant, and the Nagymaros works as an equalising power plant to provide better conditions for shipping and to regulate peak outflow from Gabčíkovo.