The volumes of the water reservoirs flooded with high-rise hydrotechnical facilities, including high-rise earth dams, often range from several hundreds of millions to tens of billions of cubic meters and even more. The present paper describes the methodology to calculate the social-economic losses for the facilities flooded and destroyed by a tsunami-type wave in case of a possible high-rise hydraulic facility accident.The social-economic damage caused by a dam failure can be viewed as a sum of dam-age caused by human victim, destruction of hydraulic and industrial facilities and agricul-ture, pond economy, forestry and communal services.

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