Hydraulic structures (dams, hydraulic steps, reservoirs, cascades) are the indicative in aspect of the water tourism. Water dammed by these objects is used often for recreation purposes. Unfortunately by decreasing of the biodiversity the damming has negative influence for river as well as for river valley ecosystems. It also happens that landscape factors decrease after introducing of the river hydraulic structures. This effect is even stronger when chaotic touristic infrastructure appears. When natural hydrodynamical conditions of the river are not properly discovered even kayaking routes can disturb the fluvial processes. The subject of the paper is to meet the problems appearing after introducing of the tourism and recreation activities to the high valuated or protected areas of rivers and reservoirs. The negative results of them (canoeing, sailing, fishing, recreation) were analyzed for introducing the new ones not diminish but even improve the natural and landscape factors within and around of the open waters.

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