Aim of the study:
The aim is to analyze the effect of check dams on the granulometry of the sedimentary deposits in the region of their impact. Data necessary for the work was obtained during field measurements, which were carried out in May 2017. The sediment was collected using the Wolman's method. Data collected in this way were used to determine granulometric curves, determine granulometric parameters and determine the shapes of grains forming river debris in the region of the studied objects.

Material and methods:
The sediment measurements were carried out below and above the check-dams using the Wolman's method. The grain size curves were then plotted, granulometric and sedimentological parameters were calculated. In addition, grain size and shape were determined using the Sneed and Folk methods.

Results and conclusions:
The number of discoidal grain pebbles grew below the dam in relation to the level above the dam. In the material collected below the dam there was a smaller number of spindle-shaped grains than in the material collected above the dam. Above the dam there are larger amounts of finer material than below. This may be related to the retention of even small grains of pebbles in the dam reservoir, in which the flow velocity is lower than in the riverbed, thus causing the depositing of the carried material. On the other hand, in the lower station, due to the increased velocity of water flow, a small debris is washed away, and in the bottom of the trough only thins are found.