Abstract
The Shirvan River Basin is located at an altitude of 400...4466 m above sea level in the southern part of the Greater Caucasus, on the territory of the Republic of Azerbaijan. The basin is surrounded by the foothills of the Greater Caucasus, bordered on the east by the Aghsuchai River and on the west by the Alijanchai River. The water resources of the study area are mainly used for agriculture, drinking water supply, etc. As the lower part of the area is located in the arid zone, river water is used for certain economic purposes. These economic activities have a great impact on the river regime. Therefore, it is necessary to take a serious look at the water resources of the area and to make a proper forecast. In this regard, one of the important issues is the scientific study of statistical analysis of average annual river flow and assessment of modern changes in the flow of rivers flowing through the territory of Shirvan. The analysis carried out showed that the largest changes in the value of the flow were observed in the rivers Alijanchai, Turyanchai, Demirparanchai, Girdimanchai and Aghsuchai. In Turyanchai and Demiraparanchai, an increase in discharge of 14,2 % and 20,6 %, respectively, was observed in the current period (1991...2017) compared to the period 1960...1990. Odanko River Alijanchay, Girdimanchay and Aghsuchay experienced a decrease in discharge of 9,2 %, 25 % and 15,8 % respectively
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