JSC RusHydro has begun construction of a new spillway for the Yegorlykskaya hydroelectric power plant as part of a project to rehabilitate and modernize the cascade of hydropower plants on the river Kuban. The existing 50 year old spillway will be replaced by a higher capacity one used for water discharges. It is expected that the construction work costs will be in the region of RUB212.4 million (US$6.45 million) and are due to be completed by the end of 2014.

The increased capacity will be 120m3/sec which will allow full water passage even in the event of full outage of the turbines. Also included in the hydropower plant is a combined pass-through capacity which will total 250m3/sec. This is sufficient to withstand even extreme floods. The new spillway will be ~517m long and 17.6m wide and made of monolithic concrete.

Yegorlykskaya station was originally constructed in 1956-1962; it comprises a 1320m long landfill dam, intake canal, tower, spillway, discharge canal of the spillway and a turbine building housing two separate hydropower units with a combined capacity of 30-MW.

Source: Water Power Magazine
Link:
http://www.waterpowermagazine.com/news/newsnew-spillway-under-construction-for-yegorlykskaya-plant-russia