Dam safety work sought on plunge pool of Africa's Kariba Dam

Kariba Hydropower Project

The European Development Fund invites applications for pre-qualification to perform dam safety work to reshape the plunge pool of Kariba Dam, site of three hydroelectric projects on the border of Zambia and Zimbabe. Responses are due November 10.

Kariba's 128-meter-tall double-curvature arch dam was completed on the Zambezi River in 1959. It is operated by the Zambezi River Authority for its owners, the governments of Zambia and Zimbabwe for water resource benefits including the 750-MW Kariba South Bank hydroelectric project in Zimbabwe, which is being expanded to 1,050 MW; 720-MW Kariba North Bank in Zambia, expanded from 600 MW; and the 360-MW Kariba North Bank Extension project completed in 2014.

After 50 years of operation, Kariba Dam requires rehabilitation for continued safe operation. Zambezi River Authority plans refurbishment and upgrading of the spillway system and reshaping of the plunge pool under separate contracts.

The plunge pool contract would reshape the pool to protect areas of soft rock, a fault zone, on the upstream face of the pool against erosion that would undercut dam wall foundations. The United States Society on Dams issued a white paper in 2009 on rock scour of dam foundations including a case study of Kariba Dam.

The European Development Fund seeks firms to: produce construction designs and drawings for rehabilitation work; construct all temporary and permanent structures; perform controlled blasting and removal of 305,000 cubic meters of rock for plunge pool reshaping; perform civil works for fault treatment; drill piezometric boreholes; provide instrumentation to monitor blasting vibrations; and perform all related work. Work would require at least three years beginning in June 2015.

The European Development Fund invites applications for pre-qualification for the work in English using a standard application form from its Internet site, https://webgate.ec.europa.eu/europeaid/online-services/index.cfm?do=publi.welcome&nbPubliList=15&orderby=upd&orderbyad=Desc&searchtype=RS&aofr=136134&userlanguage=en. It plans to invite a short-list of four to six firms to bid for the work.

Responses are due by 2 p.m., Central European Time, November 10 to the address below. For information, contact Daniel Maimbo, Deputy National Authorizing Officer (NAO), European Develoment Fund (EDF) in Zambia, Ministry of Finance of the Republic of Zambia, P.O. Box 50376, Lusaka, Zambia; (260) 211250828.

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