Summary: The paper analyses the change of the water output of the Danube and Tisza and the amount of precipitation in Hungary, on the basis of the data between 1915–1972. It is established with trend calculation that in the last sixty years the height of the annual mean and annual maximum of water level and the amount of precipitation shows downward tendency. With the help of harmonic analysis many periods are revealed within the data of water-level and precipitation. Among them the most characteristic is the period of 13 years.

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