Moravskoslezské Beskydy Mts, mountain stream, step-pool, stream restoration

Torrent and gully control (currently regulated by ČSN 75 2106) in the Czech Republic landscape has influenced mountain streams since the 19th century. Mainly traditional control works are implemented, particularly staircase-like sequences of concrete check dams or bed sills. The main objective is to reduce the channel slope, inhibit erosion of the channel bed and banks and limit sediment transport into the lower parts of the basin. Modern trends of control works abroad tend to conservation of natural channel morphology. In last two decades, sequences of artificial boulder steps alternating with pools are widely used in mountain streams restoration. Natural step and pool systems in mountain streams show high values of flow resistance reducing sediment transport and they does not affect the channel connectivity and stream ecology by contrast to artificial check-dams.