Groundwater resources in the Kolyma River valley and their changes caused by the operation of the Kolyma hydropower plant

The transformation of the formation conditions of natural freshwater resources caused by the construction of a water reservoir in the Kolyma River valley is considered. Water resources in the winter low-water season downstream the dam were found to increase many times, and a new groundwater recharge area appeared in the river valley between reservoir upper reaches and Ust’-Srednekan Settl. An increase in seepage loss from the reservoir cannot be ruled out, the more so after the construction of the Ust-Srednekansk Hydropower Plant.