The article discusses the need for measures to improve the hydrological regime of the Kuban water basin, taking into account climate change, namely, mathematical modeling of the hydraulic conditions for conjugation of the pools of the spillway structure of the Krasnodar reservoir and ways to improve the hydrological regime of the river. Pshish and Kuban. The Krasnodar reservoir at high water levels in the rivers changes the feeding boundaries for groundwater in the protected area, and at low low water levels they are drains. When water levels in the reservoir are less than 29 m (this is a low water level in the Pshish River in the area of the transverse dam), its influence on the protected area practically ceases, since the coastline of the Krasnodar reservoir recedes from the transverse dam far to the northwest, exposing earlier flooded riverbed. Due to the increasing climatic changes in the south of Russia, namely, the constant decrease in the water level in the Caucasus mountains from year to year has led to a deterioration in the hydraulic regime throughout the entire Kuban water basin. From year to year, there is a deterioration in the situation, which leads to deformation processes in the channel of a very unpredictable river. Kuban, which will further contribute to the development of lowering the water level in relation to the initial data at the time of design and construction of the reservoir. There was a danger of violation of the hydraulic conditions for the conjugation of the pools of the spillway structure – ensuring the necessary conjugate depth of the perfect hydraulic jump and, consequently, preventing it from jumping out of the water well. In the latter case, catastrophic consequences would have occurred. The Kuban is the longest and most abundant river in the Greater Caucasus. this is the main water artery of the western and northwestern part of the northern slope of the Greater Caucasus Range and the southern part of the western Ciscaucasia, carrying its waters through four regions of southern Russia: the Krasnodar and Stavropol Territories, the Karachay-Cherkess Republic and the Republic of Adygea. The Krasnodar reservoir creates the necessary water level support on the rivers – tributaries, which, when the maximum water flow passes, can spread to the river. Pshish for 10-12 km.