The research was carried out in the hydrological years 2004 and 2005 within the catchment of a mid-forest pond situated in the southern part of the Wielkopolska Lowland. The results of measurements of the water levels in the pond and the groundwater levels in the surrounding forest sites were analysed against a background of the atmospheric conditions existing in this area in the study period. It was found that the water levels in the pond are significantly related to the groundwater levels in the forest sites adjacent to the reservoir. In winter half-years, groundwaters from the adjacent areas supplied the pond, whereas in summer half-years, the latter fed the groundwaters of the forest sites.

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