The Vchynicko-tetovský Floating Canal built according to the project by the engineer Josef Rosenauer in 1799-1801 comprises special water structures to support its navigation capacity - eight artificial water reservoirs called "klauzy" or "švele". The system of reservoirs was built on the upper stream of the Modravský and the Roklanský streams, thus giving birth to the potent navigable system enabling timber exploitation and floating from still intact forests.
Names and volumes of the reservoirs: Luzenská 21 000 m3, Rokytecká 18 000 m3, Javoří 16 000 m3, Novohuťská 15 000 m3, Roklanská 14 000 m3, Studená 3 000 m3, Černohorská 2 200 m3, Ptačí 1 000 m3.
Water was released from these reservoirs upon need and the torrential wave assisted in transportation of the logs into the floating canal. The timber collected from the forests was driven to the suitable water courses on sledges in winter. The sledges were less than 3 metres long and had a capacity of three cubic metres of timber.
To transport long logs, two sledges in line one behind another were used. This form of transportation was still used after the World War II in the Modrava surroundings but was substituted by cable railways and via new roads after 1950.