Summary:

The regulated weirs are the high river bars constructed across to channel axis, which overfall crest is situated within the range from 0,5 m to 2,0 m, at level of down stage. These weirs are constructed in rivers and mountain streams, and characterized usually of relatively deep channel intersection, which make impossible application of the by-pass channels for fish. The only solution is then fishway located at the weir width. Fish passed can be occupy the all weir width and then it creates the stone ramp, changing the function of the weir rapid. So as, to keep the previous function of weir, the fish passage is constructed as riverbed connecting the upper and the lover station, as an half-timbered fish passed. In the paper has been presented the own design of the half-timbered fish passed (combination of the rapid and chamber fish passed). The proposed type of the fish passed has been exposed to the laboratory studies on model in the scale of 1:10. Basing oneself on the results of model studies, two half-timbered fish passed have been designed and realized in streams of the Sudety plateau.