solid material on the waterbed which solid material is subsequently fed together with the total flow resulting from motive water flow 26 and pressure water flow 27 into hopper 11 by the action of pumps 17 and 22 during the dredging process described above hopper 11 is loaded with the solids water suspension while the solids in the solid material in the suspension drops to the bottom or floor 11 39 of hopper 11 see fig5 water from the surface of the suspension flows over the upper rim of central suction shaft 15 into the interior of hollow suction shaft 15 central suctioning shaft 15 serves as an overflow shaft during loading of the hopper the overflow water is suctioned off from central suctioning shaft 15 by water pressure pump 17 and thereafter recycled through pressure line 18 to towed suction basket 19 since the pressure of pressure water flow 27 is equal to the pressure of motive water flow 26 and is set at a value of between 3 and 5 bar pump 17 can have a size that is appropriate for the dredger in which it is to be accommodated moreover because the acceleration of the solids water mixture according to the invention is no longer provided by the suction pump and since surrounding water from the region.