engleski

Ecologically Acceptable Flow Definition by the Wetted Perimeter Method

The paper analyses the problems of determining the ecologically acceptable flows (EAF) in open watercourses. The introductory part describes the reasons of the phenomenon and the need for determining of EAF. A determination of a EAF by the wetted perimeter method is given. The method was applied for the first time about twenty years ago, and at the present it is frequently used in practice due to its comparative simplicity, but also due to ecological-biological soundness. It belongs to the group of methods using a single criterion analysed in detail. In this case it is the parameter of the wetted perimeter of the watercourse topography, flow dynamics, as well as ecological properties essential for habitat development and fish migration. In the closing part of the paper, the wetted perimeter method has been applied to three cross-sections on the Kupa River, showing certain problems that may occur during its application in practice.

hydrology; ecologically acceptable flows; wetted perimeter; open watercourse

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