NOVELTY - Water power effect has been examined with the use of fiberglass reinforced tarpaulins which have permitted a light construction but also a suitably strong installation to withstand water pressure. The use of other materails can be considered which might increase strength. Five sections are joined together sideways so that the limits with a dam sheet in the middlemost section forming an upright band with floating bodies applied to its upper edge and weights attached to its lower edge. Along the upper and lower edges a rope is fixed which runs along the limits.    USE - As a new construction of a water power plant where water in the open sea can be used whereby horizontal energy transport can take place through waves and currents from point to point in the water surface and in the thereunder located surface layer for driving e.g. a generator.    DETAILED DESCRIPTION - In the two end sections articulated plates are applied in the outer edge of the limits sideawys. The two plates are joined to a fixed anchorage with lines in such a manner that the plates are fixed at an angle to the wind and to the run of the waves, so that an outward force is created which regulates an opening in the limits which has the form of a rounded U. When the wind strength increased and the wave growth increased water pressure on the limits, a tractive force occurred on the inner edge of the plates. This caused the plate angle to the wind direction to change and also to the run of the waves, so that the sideways upwardly directed force was reduced and the limits produced a smaller opening to the wave direction with the shape of a narrowed V. The dam sheet can eb provided with a channel which conducts water pressure towards e.g. a propellor, water turbine or conveyor belt of the continuous track type which externally has the appearane of a belt for a snow sleigh, piste machine or snow scooter. The use of a wide transport belt causes floating and active marine growth to be forced loose from the arrangement. The risk that the dam sheet ceases to fnction stops the floating material passing through the limits.    DESCRIPTION OF DRAWING(S) - The provided drawing is not selected as it illustrates none of the constituents of the invention.