The partially-immersed, floating collection vessel (12) includes a base opening (20) and an inlet (22) providing accessibility in the upper side (18) to a flotation system, operating in accordance with the internal water level (WS). A suction unit removes water from the vessel through the base opening. Flow equalization acts on the flow in the collection vessel from the inlet opening towards the vessel base (16). The collection vessel has floats (32) which can be flooded under control. The suction unit has a pump. The inlet opening is made accessible by a float-controlled flap valve as a function of the level. A suction unit removes collected contaminants from the vessel. Float control of the extraction device is further elaborated. Level controllers with flap valves are incorporated.
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