The inlet structure of the fishway in the Veľké Kozmálovce Dam.

A dam creates a barrier that restrict or does not allow the cycle of downstream and upstream fish migration between the stilling basin and the upper reservoir. One of the possible solutions is the design of a new fishway or, if possible, the reconstruction of the existing one. The research and design criteria for the new fishway were based on: (1) previous research focused on the most advantageous entrance of the fishway; (2) precise geodetic surveying of the featured location; (3) the bio-ecological input conditions, set by a group that included the official state ichthyology association and bio-ecological supervision; (4) the methodological guidance for "Determination of suitable types of fishways according to typology of waterways" made by the Ministry of Environment. The most important structural part of the designed fishway is the inlet structure for flow distribution and regulation. The research compared possible design criteria according to optimal parameters for fish to migrate. [ABSTRACT FROM AUTHOR]