The application of hydrological models to data on conservative tracers can yield information about transit times and storage volumes and may provide an independent test of the model structure.

In this study, the PULSE-model has been modified to simulate conservative tracers. Attempts have been made to describe both short-term and long-term variations in oxygen-18 concentration in three small forested basins.

The performance of the model was considerably increased, when additional storage was introduced in the model. The turnover times were estimated to approximately 7 and 12 months for two of the basins.

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