Technical audit sought for plunge pool rehab at Africa's Kariba Dam

Kariba Dam

The European Union invites applications for pre-qualification to conduct regular technical audits of 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 April 10.

The European Development Fund last year pre-qualified firms to perform the plunge pool work at Kariba, a 128-meter-tall double-curvature arch dam that was completed on the Zambezi River in 1959. The Zambezi River Authority said in January that total rehabilitation of the project for safe operation will require US$300 million.

The dam 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.

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 Union now seeks consultants to audit the contract to reshape the plunge pool and refurbish the spillway system. With a maximum budget of 700,000 euros (US$751,740), the work is expected to require 57 months.

The European Union invites applications for pre-qualification in English using a standard application form from its Internet site, It plans to invite in May a short-list of four to eight firms to bid for the work.

Responses are due by 1 p.m., Zambian time, April 10 to the address below. For information, contact Head of Finance and Contracts Section, Delegation of the European Union to the Republic of Zambia and Comesa, Plot 4899, Los Angeles Blvd., P.O. Box 34871, Lusaka, Zambia; (260) 211255583; Internet:

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