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To maintain enough water in the river for ecosystems protection and river bed sanitation, water have to be allocated to ecosystems, as it is allocated to other users like domestic use and industry, agriculture and power generation. Water distribution is critical in dry periods. This requires proper determination of environmental flow (river ecosystem minimum permissible flow) by hydrology-based assessment methods. The purpose of this paper is to compare selected hydrological methods and to define the scientificall...

Nitrogen pollution contributes to climate change, acid rain and eutrophication. The present study evaluates the degree of nitrogen contamination of air, surface and ground waters in Bulgaria with reference to the 2021 EU Action Plan 'Towards Zero Pollution for Air, Water and Soil' as well as the relevant international and national regulations in the field. The analysis uses data from the Bulgarian Ministry of Environment and Water, Ministry of Agriculture, the European Emission Database for Global Atmospheric Rese...