Since the early history, man has been influencing the water cycle. The originally unintentional impact of humans on water cycle has evolved in intentional managing of all water systems on the continents. With time the influencing of the water cycle has become intensive with more serious consequences. Improved technical skills have enabled humans to change water courses and build artificial water bodies to store water and modify natural water flux. Large areas of wetlands were drained to gain farmland and fight against malaria, etc. Population growth together with rising urbaniza tion have increased the demands on water supply and resulted in water pollution and exhaustion of water resources. For sustainable development, the ever grow ing pressure on water ecosystems needs to be suppressed by reasonable management of water cycle. Water cycle management involves modeling and speci fying the hydrological characteristics of a region. It should however in the first place be focused on the sustainable management of the whole landscape.

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