Excavator attachment drains swamp - GIF

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I've seen this similar hydraulic driven agitator used for dredging the Mississippi River by Lacrosse, Wisconsin. Just a much longer arm on a floating barge with motive power, with a big centrifical pump that can handle the sand/6" rocks, as they pipe it in a floating bridge pipe to land where it becomes a huge sand pile, after going through a screening operation to separate rocks/gravel from the sand. That was in 1976. I assume the difference is this has the pump located right above the suction inlet screen. I bet this thing has problems if it's not pumping a clay slurry.