A mathematical model METUL for estimating the daily groundwater level and drainage, surface and subsurface runoff in small areas is described. Input data for the model are daily mean values of air temperature, precipitation and vapour pressure deficit, as well as the occurrence and disappearance of snow cover. Questions about the determination of the model's parameters are discussed, and the results of the model's application to experimental areas in two drainages are analyzed. The model's usefulness in objectively determining the soil water regime of small areas after only short-term groundwater level observations is shown.

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