KARIBA DAM REHABILITATION


Overview

  • Reference: P-Z1-FA0-075
  • Approval date: 15/12/2014
  • Start date: 16/11/2015
  • Appraisal Date: 15/04/2014
  • Status: OngoingOnGo
  • Implementing Agency: ZAMBEZI RIVER AUTHORITY
  • Location: KARIBA DAM

Description

The Plunge Pool: This component will include

(i) technical assistance to ZRA in detailed design, supervision and preparation of bidding documents for the works associated with reshaping of the plunge pool;

(ii) actual works associated with the reshaping of the plunge pool;

(iii) environmental and social mitigation activities; and,

(iv) strengthening the project implementation team for effective project monitoring and implementation. This will be supported through the provision of: a) Consulting Services; b) Civil Works; (c) Goods, Equipment and Non-Consulting Services; (d) Operating expenses. This requires an estimated USD80 million and the EU indicated a willingness to provide a grant of Euro74 million to support this component. ZRA is in the process of preparing the procurement documents for the component. The Spillway Structures: This component will include exactly the same subcomponents as the Plunge pool and it is estimated to cost USD150million for which resources are being sought from the WB and the AfDB.


Rationale

Considering Kariba's large reservoir capacity (185km3) a dam failure would result in a catastrophic disaster downstream in the Zambezi River Basin. An incident of that nature would negatively impact generation at Cahora Bassa Dam, causing regional power shortages arising from a loss of 40% of the SAPP generation capacity (excluding RSA), i.e. 1,320 MW at Kariba and 2,075 MW at Cahora Bassa. The largest ever flood on record was estimated at 61km3 over 90 days in 1958/59. A failure of the Kariba Dam would likely result in a flood four times larger than this, as a result of the combined storage of the Kariba (185km3) and Cahora Bassa reservoirs (52km3). Such an event would also cause devastating flooding of low lying areas in Zimbabwe, Mozambique Zambia and Malawi. The 2001 floods (January through April) resulted in damages of more than US$40 million, the displacement of an estimated 500,000 people and estimated 150 fatalities, with around 100,000 ha flooded. This would most likely be surpassed by a dam failure at Kariba and downstream impacts.


Benefits

The major benefits of this project is protecting major power infrastructure hence keeping power on in SAPP and saving lives and livelihoods which would be negatively affected should a dam failure occur with subsequent flooding.


Key contacts

MUGUTI Elizabeth - ONEC2


Costs

Finance source Amount
ADFUAC 40,710,000
Co-financierUAC 7,750,000
DeltaUAC 141,708,109
TotalUAC 190,168,109