Assessment of the River Runoff Changes in Lenkoran Nature Region

In the conditions of climate change and increase of anthropogenic load upon environment ,one of the main direction of scientific hydrological research in the nearest decades will be assessment of water resources. The paper presents the results of assessment of the Lenkoran Nature Region river water status change over the period from 1990 to 2017 based on observation data from 13 closing ranges. The computations were carried out with taking into account runoff data of the rivers. Considerable number of the points has short observation series or gaps in observations; therefore, we in advance have reduced short series to the single many-year period. Runoff from the territories that had not been covered by hydrometric measurements was determined by computations by the analog rivers’ runoff or by the runoff maps. When assessing water resources for a number of ranges affected by economic activities, we have used the data on water abstraction and disposal and results of researches on assessment of evaporation from the catchment surface. The carried out computations resulted in statement that natural average many-year annual runoff of the Lenkoran Nature Region rivers is 0.993 km3.