Abstract: An apparatus for holding back, and diverting, fish in bodies of water by the arrangement of parallel cables (S) braced between two or more abutments (W), wherein the distance between the cables is small enough to prevent fish from swimming through the apparatus.

Abstract: The present invention relates to a hydraulic energy store (1) having a first (2) and a second fluid reservoir (6), the fluid levels (4, 12) of which extend at different heights, which are connected to one another via a turbine/pump arrangement (10) and during the operation of which a fluid (3) can be moved to and fro between the first (2) and second fluid reservoir (6) and energy can be converted in the process. The second fluid reservoir (6) is configured as a container which is arranged within the fluid (3) in the first fluid reservoir (2), wherein, during operation, the fluid level (12) in the second fluid reservoir (6) can be changed in such a way that, as a result, the immersion depth (ht) of said second fluid reservoir (6) in the first fluid reservoir (2) can be changed owing to buoyancy.

Abstract: An apparatus for holding back, and diverting, fish in bodies of water by the arrangement of parallel cables (S) braced between two or more abutments (W), wherein the distance between the cables is small enough to prevent fish from swimming through the apparatus.

Abstract: The present invention relates to a hydraulic energy store (1) having a first (2) and a second fluid reservoir (6), the fluid levels (4, 12) of which extend at different heights, which are connected to one another via a turbine/pump arrangement (10) and during the operation of which a fluid (3) can be moved to and fro between the first (2) and second fluid reservoir (6) and energy can be converted in the process. The second fluid reservoir (6) is configured as a container which is arranged within the fluid (3) in the first fluid reservoir (2), wherein, during operation, the fluid level (12) in the second fluid reservoir (6) can be changed in such a way that, as a result, the immersion depth (h1) of said second fluid reservoir (6) in the first fluid reservoir (2) can Ere changed owing to buoyancy.

Abstract: The arrangement for producing linear standing waves includes: a transverse structure arranged at least substantially perpendicularly to the flow direction, the structure designed such that the outflow is converted from a streaming flowing movement into a shooting flowing movement; a ramp connected downstream to the transverse structure and arranged at least substantially perpendicularly to the flow direction; a counter-ramp arranged at least substantially in the flow direction at the downstream end of the ramp and the average inclination in the flow direction forms an angle to the horizontal in the flow direction, and which has a flow-promoting transition to the ramp at its upstream end; a base arranged downstream of the ramp and the counter-ramp and whose bottom is arranged lower by a height dimension than the downstream end of the ramp and/or the upstream end of the counter-ramp.

Abstract: The arrangement for producing linear standing waves comprises: a transverse structure (Q) which is arranged at least substantially perpendicularly to the flow direction (S), this structure being designed in such a way that the outflow is converted from a streaming flowing movement (Froude number <1) into a shooting flowing movement (Froude number >1); a ramp (1) which is connected downstream to this transverse structure (Q) and which is arranged at least substantially perpendicularly to the flow direction (S); a counter-ramp (2) which is arranged at least substantially in the flow direction (S) at the downstream end of this ramp (1) and whose average inclination in the flow direction (S) forms an angle (?) to the horizontal in the flow direction (S), and which has a flow-promoting transition to the ramp (1) at its upstream end; a base (3) which is arranged downstream of the ramp (1) and the counter-ramp (2) and whose bottom is arranged lower by a height dimension (a) than the downstream end of the ramp