Abstract
Three main causes of river network alterations are described. 1. External impacts or complex of several impacts on drainage basin . These impacts may be caused by tectonic movements, volcanism, climatic changes, oscillations of end basin level and abrasive activity related to transgression. Their results may be whether broad and cover a series of neighbour basins, or local one. 2. Interaction of adjacent drainage basins with different velocity of inner processes . 3. The change of relief type within drainage basin (for instance from mountain into plain one) followed by alteration of types and velocities of major relief formation processes .
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