PURPOSE: To improve operating efficiency and transport capacity without requiring large-scale civil engineering works.

CONSTITUTION: A conveyor 5 for transferring and landing dredged material such as soil and sand dredged by a dredger onto a land is laid between the proper place of the land and the water surface of a dam lake. The conveyor 5 is composed of a first belt conveyor 6 laid on a border section between the ground and the water surface and a second belt conveyor 7 laid on the water surface under a floated state. The first belt conveyor 6 is borne on a floating body 25 so that a head section and a part of an intermediate section are borne on the ground and the residual section of the intermediate section and a tail section are floated on the water surface in response to the change of a water level.