Abstract
Several thousand hydraulic barrier structures (dams, embankments, ash dumps, and others) are presently operating in the former territory of the USSR. Most of them have been operating for several decades. The rate of failures (incidents, emergency situations) of analogous structures, according to foreign statistical data, reaches 2 x 10{sup {minus}3}/yr. In countries of the Commonwealth of Independent State (CIS) the condition of several tens of the 400 large hydraulic structures of hydropower developments does not completely meet the requirements of safe operation. On average from four to six incidents and damages (failures) are recorded on these structures annually. Failures of large dams in our country and abroad have led to the loss of lives and to material losses. Thus, the failure of the Teton dam in 1976 (USA) took the lives of 11 persons and caused $1 billion of damage. Breakthrough of the 15-m dam of the Kiselevsk hydro development in the Urals in 1993 took 19 lives and caused considerable damage.
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