AVERAGE ANNUAL RIVER DISCHARGE ASSESSMENT, YANTRA RIVER, NORTH BULGARIA

The study was performed for the needs of Danube river basin directorate in Bulgaria. The object of investigation is Yantra river basin situated in North Bulgaria. The Bulgarian Ministry of Environment and Water was provided the points for each effluent or water abstraction facility. For all points it was requested to evaluate 10% of multiannual average river discharge. For the drainage basin of Yantra river the points are 195. The selected cross section (points) are along the main river body and also on the main river tributaries. The majority of the points are located in the drainage basins of Vidima, Rositza, Belitza and Drianovska rivers. Three homogeneous regions were determined: upper mountain tributaries; middle part and lower part of Yantra river basin. Map with determined homogeneous regions for the drainage river basin is elaborated. The obtained results are discussed.