Abstract: An overflow system for a hopper dredger includes an overflow tube; and a plurality of canals adjacent and substantially parallel to the overflow tube. The plurality of canals have inlets at different heights for taking in head water from the hopper. The plurality of canals fluidly connect to the overflow tube at a point downstream from the inlets.

Abstract: An overflow system for a hopper dredger includes an overflow tube; and a plurality of canals adjacent and substantially parallel to the overflow tube. The plurality of canals have inlets at different heights for taking in head water from the hopper. The plurality of canals fluidly connect to the overflow tube at a point downstream from the inlets.

Abstract: A suction head (1) for a dredger, includes;—an outlet (2) for fluidly coupling the suction head with a suction tube (3) for transport of dredge to the loading space of a floating dredger;—a sand inlet (4), which in use faces a sand bed (5) to be sucked away, for taking in a flow of dredge (6) in the suction head, and which flow of dredge runs in a dredge flow direction (7) at the sand inlet;—a side inlet (8) fluidly coupled with the sand inlet, wherein the side inlet and the outlet are arranged at opposite sides of the suction head for introducing a lateral flow (9) from outside the suction head into the suction head locally at the sand inlet, which lateral flow runs substantially transverse relative to the dredge flow direction.

Abstract: A passive overflow device for draining away head water standing above settled sand in a loading space of a hopper, wherein the passive overflow device extends along a longitudinal axis and includes: an inlet for taking in the head water; an outlet section having an outlet for opening out in the outboard water and which outlet is level adjustable into an active position wherein in use, the head water is delivered proximate the sea bottom; a conduit which extends along the longitudinal axis of the passive overflow device and which conduit fluidly couples the inlet and the outlet; and a supporting structure for coupling the overflow device with the loading space of a hopper, wherein, the outlet section includes an flexible portion proximate the outlet for preventing mechanical overload to the supporting structure when the outlet, in use, in its active position accidently abuts the sea bottom.