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The research uses monthly water flow in river watersheds within Danube-s river basin - Ogosta, Iskar, Yantra and Rusenski Lom rivers, as pilot basins. The water flow indicators describe river flow regime and hydrological streamflow characteristics. Our article describes the determination of environmental flow limits on surface water abstractions in Bulgaria. Monthly river flow is characterized by annual variability due to climate factors and anthropogenic impacts. Furthermore information from hydrometric stations ...

In climate change, drought, and water scarcity, the natural functioning of river systems largely depends on the proper distribution of water resources. Accurate determination of hydrological characteristics is essential for the sustainable management of water resources and provides information on the status and potential of water systems. Water management must be implemented in such a way as to meet the needs of man and the economy. At the same time, measures are taken to protect the quantitative characteristics o...

Hydrometric propeller methods, is device that responds and measuring the velocity of the water current at the point where its sensor axis is located. Mechanical hydrometric propellers are widely used in our country, in which the current causes rotation of a screw vane with an angular velocity proportional to the velocity of the current, in this method the depth of the river profile must be taken into account in order to comply with the measurement condition in 1, 2, or 3 points namely 0.2h, 0.6h and 0.8h, h-depth ...