ASSESSMENT OF THE PERMISSIBLE EXTRACTION OF NON-METALLIC BUILDING MATERIALS FROM THE RIVERBED ON THE EXAMPLE OF THE PRIPYAT RIVER

The article substantiates the possibility of carrying out work on the extraction of non-metallic building materials from the riverbed of the Pripyat River on the basis of comparing the existing flow and determining the predicted ecological flow of the river. The numerical simulation of the longitudinal flow has showed a redistribution of velocities within the slots and technological breaks, which form sections with a flow velocity of less than 0.3 m/s with-in the deepened part of the slot, and increased velocities of more than 0.9 m/s in the sections of technological breaks, which increases the intensity of sediment deposition. The volume of possible intake of material from the river amounted to 33122.5 m3 has been established, which corresponds to carrying out work no more than once every 3 years with mandatory re-peated environmental assessment of hydraulic and hydrological processes. The total com-pensation payments for the harmful effects of the planned works on the ichthyologic fauna of the Pripyat River in the Pinsk district of the Brest region have been determined.