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Flow of water and thus access of oxygen to the roots of the trees is ensured by drainage system. Therefore these system had been established, mostly since 1960th and 70th in a third of the forest area of Latvia. It has boosted the overall increment of forests substantially. However, around the same time, also beavers had been reintroduced in territory of our country. Water flow is often stopped by beaver dams. The aim of our case study was to assess the impact of dam removal and ditch reconstruction on the increme...