Research of water relations existing on formerly arable lands covered by forest was done within Wrocław between April 2000 and October 2002. The existing natural water system and the land reclamation system with two small reservoirs were found to have an advantageous effect on the amount of soil retention in the adjacent lands. Due to that system the moisture reserves in the soil profile were about 30–120 mm greater than in the area outside the range of influence of controlled water management, and at the end of growing seasons during the years with low precipitations and high air temperature the ground water table was around 40 cm higher.

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