Data provided by the following organizations: Ultimately the Irkutsk Region Yenisei STB RosVodResursy , Siberian Branch FGUNPP " Rosgeolfond "

In the long-term average water balance of Lake Baikal Receipt of the balance sheet shows :

Costavlyaet expenditure side of the balance are:

The lake level depends not only on the ratio had fallen to its catchment rainfall and inflow of surface and groundwater ( parish) , evaporation and runoff p . Hangars (expense) , but the mode of operation of the Irkutsk hydroelectric station, the Bratsk hydroelectric station , Ust- Ilim hydroelectric station working in the compensation , interdependent mode. On December 1, 2012 commercial operation was introduced Boguchanskaya HPP , filling the reservoir which began in summer 2012 .

After the construction of the Irkutsk hydroelectric station dam ( 44 m high and 2.5 km long ), 70 km from the source of the Angara and filling Irkutsk Reservoir ( 1956-58 ). Backwater from the dam in 1959 has spread to Lake Baikal and in 1964 exceeded its average annual level of 1.30 meters ( 456.80 m) . In the future, the average annual level of over-regulated lakes ( single level Irkutsk reservoir ) is maintained at 1 m above the mean lake level that existed before the construction of power plants . This allowed the use of the volume of the lake as a reservoir to regulate the flow through artificial seasonal annual and , to some extent , long-term water level control Annual variations in the level of Lake Baikal backwater conditions generally remained close to the natural regime. Regulated manifested in increasing oscillation amplitude level ( from 80 to 113 cm) and a shift to delay timing of the greatest operation and filling of the reservoir. Annual variations of the level on the lake is usually characterized by a smooth rise to a level close to the normal water level ( May -September ) , the stabilization of the maximum levels in October and a continuous decrease from November to April .

The needs of navigation and water supply in the Angara -Yenisei basin also correlated with the levels of Lake Baikal and hydroelectric reservoirs .

Fluctuations in water level in Lake Baikal through an extensive water surface area ( 31,500 cubic km.) And a significant drain from the lake at the source of the Angara River (60 cu. Km / year ) in annual average small:

Over the entire period of artificial regulation of Lake Baikal in 20 cases exceeded the highest annual rates of normal water level , forcing ranged from 6 to 43 cm in 1979-1982 . level fell 32 cm below the design level of dead level (equal to 455.54 m MOT ) .

The average amplitude of fluctuations in the level for the year is 102 cm , the highest recorded in 1973 (183 cm ), the lowest 62 cm in 1972 Total range of variation ( between maximum and minimum levels for Many Years ) is 221 cm

Coastal erosion and deformation of coastal structures periodically renewed at high lake level position , especially in pozdneosenny period when made ​​stockpiling water ( hydropower resources ) and at the same time the season comes the most violent storms and ice formation .

Government of the Russian Federation dated 26.03.2001 № 234 " On the limiting values ​​of the water level in Lake Baikal in the implementation of economic and other activities " were defined limit values ​​of the water level in the lake using its water resources in economic and other activities within 456 m marks ( minimum ) and 457 m ( maximum ) system in Pacific heights. Allowable drawdown of lake level in the range of 457-456 m (in the terminology of hydropower - a "useful volume") is 31.5 km3 , ie 0.14 % of the volume of water in the lake (23 km3 ) .

This ruling reversed established " basic rules of water resources reservoir Irkutsk HPP" (1982, 1988). Limits of operational changes in water level in the lake elevations in meters 457,4-455,54 Over the entire period of the boundary decision set them never violated.

Since 2001, the amplitude of fluctuations in water level is maintained in the range of marks 456,0-457,0 m (TO) , established by the Government of the Russian Federation dated 26.03.2001 № 234 (Table 1.1.1.1.1 ) . It has always been able to achieve power generation, water intakes , navigation on the lower reaches of the Angara River and the Yenisey .

In 2012, the water levels of Lake Baikal changed as a result of useful inflow into the lake and regulate the Angara HPP , which was carried out in accordance with the " basic rules of use of water resources of the Angara cascade reservoirs HPP" , Government of the Russian Federation dated 26.03.2001 № 234 "On limiting values ​​of the water level in Lake Baikal in the implementation of economic and other activities , " decisions " of the Interagency Working group on Regulatory regimes of reservoirs of the Angara- Yenisei cascade and Nordic hydropower plants, the water level of Lake Baikal "and directed the Federal water Resources Agency .