Ivan Blinkov


Environmental flow is defined as the flow that is necessary to ensure the existence of habitats in a stream. Ac-cording to the practice in Macedonia, environmental flow is 10% of mean annual flow but flow variation is signifi-cant and this approach could generate doubts for engineers. The final aim of this study was to be recommended the most appropriate method for this engineering purpose in Macedonia. This study consists of two parts: a) evaluation of the most used world methods in national conditions, and b) defining of environmental flow using previously selected method on case study. The proposed approach was tested for the "Dragor" water supply system. Using basically Ten-nant approach, and making modification according to the regional circumstance related to hydrological regime, envi-ronmental flow was calculated for 3 different periods of flow values that’s follow the hydrogram.


environmental flow assessment; mountain stream

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