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Summary Prediction of water levels. Predicting of water levels may consist of: a. Prediction of the level on a given moment, b. Prediction of change through hydraulic works. c. Indication of the level to be used as a basis for the design of hydraulic works. As only c is of a statistical nature, most attention is given to it. Examples are given, but when - as in deciding about the height of dikes - the consequences of higher waterlevels than were used as a basis may be disastrous - much reluctance is met to accept this decision as a statistical one. It is shown how nevertheless the statistical approach is the best with regard to the safety of the areas protected by the dikes and how this approach may be used even when circumstances are new (as in the case of the IJssel lake) and no frequency-distribution based on experience is available. [ABSTRACT FROM AUTHOR]