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<p>There is currently no basis for the dimensioning of enature fish pass systems in the DWA M-509 “Fish passes and fish passable buildings: design, dimension and quality assurance” advisory, which is relevant for fish ladders in Germany. This article presents a proposal for geometric and hydraulic dimensioning in accordance with the specifications from the advisory. The dimensioning procedure is then demonstrated using examples. Thanks to the innovative design, discharge, flow velocities and power density can be significantly reduced compared to systems already covered in the advisory. This results in better passability for both juvenile and weakly swimming individuals. Due to possible higher water level differences between the basins with similar or smaller installation space, the enature-Fischpass-System allows a high bandwidth between a steep gradient with little space requirement and lower construction costs and a shallow gradient with lower discharge compared to other basin-type fish ladders.</p>

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Vorschlag zur Dimensionierung von enature-Fischpass-Systemen gemäß DWA-Merkblatt M 509

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Siegfried Jank,
  • Helmut Mader

摘要

There is currently no basis for the dimensioning of enature fish pass systems in the DWA M-509 “Fish passes and fish passable buildings: design, dimension and quality assurance” advisory, which is relevant for fish ladders in Germany. This article presents a proposal for geometric and hydraulic dimensioning in accordance with the specifications from the advisory. The dimensioning procedure is then demonstrated using examples. Thanks to the innovative design, discharge, flow velocities and power density can be significantly reduced compared to systems already covered in the advisory. This results in better passability for both juvenile and weakly swimming individuals. Due to possible higher water level differences between the basins with similar or smaller installation space, the enature-Fischpass-System allows a high bandwidth between a steep gradient with little space requirement and lower construction costs and a shallow gradient with lower discharge compared to other basin-type fish ladders.