**3. Results**

Hydraulic conveying belongs to the most reliable and economically justified modes of hydrotransport. Due to its ecological values, it is also the preferred solution applied in environmental engineering. Transport of hydromixture with significant amounts of solids requires determination of the hydromixture's rheological properties to adopt an appropriate rheological model of the hydromixture. Such a model, determined on the basis of experimental research, allows the calculation of the frictional pressure drop during the flow of a given mixture through industrial installation. It is also essential to determine a condition at which laminar flow transforms into turbulence.
