The results of the model tests referring to the water conditions on afforested (formerly arable) lands in Wrocław are presented in this paper. The studies showed that regulated run-off from 90 ha catchments kept groundwater table 50 cm then the non irrigated areas. It was also found that water resources stored in Spring were depleted by June. Its rebuilding in the second part of the vegetation period was possible only when precipitation exceeded the mean value.
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