The system for cleaning the water collecting basins consists of the cart 1 with pump 3, driven by the electric motor 4. The water in upper basin B, sucked by the vacuum pump through the pipe 5 is discharged in hidroelevator 8, in which its velocity is increased by the nozzle 9, thus creating suction for the fine grain material settled on the bottom by the pipe 10 with the suction cone 11. The material mixed with discharged water reaches the small vans 14, and is transported to the surface.