Summary:

A common phenomenon occurring in small river basins is an increase of spatial development in the period of last 20 years. This development is an effect of economic changes in our country, resulting in growing land cover by all sorts of infrastructure as well as in changes in method of development. It may be observed both giving up the intensive agricultural use in large parts of arable areas and even greater intensification of agricultural use in some selected favorable situated locations. Those processes are of increasing character and lead to substantial changes in hydrological conditions of runoff, which imposes the necessity of verification of the functionality of the existing water regulation structures. The authors have presented issues connected with changing basin storage and determined the influence of spatial development on basin surface sealing and rainwater storage. Concepts of land use changes were presented; calculations of water storage reservoir capacity were made, as well as the influence of storage deficit and changes in forest cover magnitude on bedload transport conditions. Critical parameters of bedload movement were calculated.