The results of many years of the field investigations conducted in small lowland catchments for agriculture and forestry are presented in the paper. It was stated that rational exploitation of land reclamation devices positively effects on water retention resources of the adjacent areas, clearly increasing water available for plants in growing season. Subsurface irrigation stabilizes water resources of the valley and allows to keep, in growing season, by 0,5 m shallower groundwater tables in comparison to areas not covered by the irrigation.

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