Dams & Civil Structures

RusHydro completes stabilization work on Zagorskaya 2 pumped-storage plant
Russian energy giant JSC RusHydro has completed stabilization work on the Zagorskaya 2 pumped-storage plant.

HydroWorld.com reports that erosion of foundation soil under the 840 MW plant was caused by the “inefficient performance” of its impervious system after workers noticed water seeping into Zagorskaya 2’s turbine room. The turbine room and other areas were flooded via broken expansion joints and intakes of unfinished water pipes, caused by soil erosion that made the building sag.

RusHydro said the stabilization work began immediately with the erection of an earthfill dam on the tailrace side of the building.

As part of the rehabilitation programme the area adjacent to the building was completely drained by June, while a temporary support was formed beneath the basement plate to prevent further subsidence. The support was formed by drilling holes and injecting more than 20,000 cubic meters of “special fluid,” RusHydro said, while the turbine room was also cleared of sand drifts.

“The stabilization of the powerhouse lays ground to the next phase of rehabilitation — eventual restoration of the plant,” the company said in a statement.

RusHydro is currently considering a number of options for the project’s rehabilitation. The final plan will be chosen by the company jointly with external experts before being presented for approval to respective government agencies.

British ICE members revisit 1864 disaster to measure current standards
A devastating ‘Flood of 1864’ in Sheffield, England, during which the Dale Dyke Dam failed, remains the greatest civilian disaster of Victorian Britain. Failing on first filling, the release of water from the dam led to the loss of about 300 lives and extensive damage to property and infrastructure.

Marking the 150th Anniversary of the Dale Dyke Dam failure, Members of the British arm of the worldwide Institution of Civil Engineers will review the latest legislation in the UK on December 3, during a presentation by Dr. Andy Hughes. Director of dams and reservoirs at Atkins, Hughes is an All Reservoirs Panel engineer and is vice chairman of the British Dam Society. He has more than 35 years of experience in reservoir design and construction, both in the UK and internationally.

ICE will review UK implemented policy and procedure subsequent to the dam failure and how policy has helped to ensure the country’s reservoirs are maintained to legislated standards. Members will also discuss current industry guidance relating to dam break analysis, inundation mapping and emergency planning.

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