Abstract
A comparative analysis of five environmental flow assessment methods was performed on the example of the Yaselda River in its Selets section. The significant difference in their results was revealed. The threshold methods provide a uniform environmental flow values along the year. The values vary among the methods. It is explained that the methods were developed in different economic and social conditions. Practically identical results were obtained with the methods used in Belarus and Ukraine. However, the other method would assume the environmental flow value above the natural flow in some periods of the year. The method of exceedance probability transfer appears to be the most promising one. Partial zoning of probability transfer parameters would make the method more efficient. For management purposes it is proposed to introduce yearly adjustments of environmental flow rates taking into account the discharges of previous years. This would allow to re-water floodplains overdried in dry years and recover habitats for biota.
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