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DAM SYNCHRONISATION AND FLOOD RELEASES IN THE ZAMBEZI RIVER BASIN: ANNEX 4 OF FINAL REPORT Bindura At the time of writing this report, the Bindura dam under construction and has a capacity of 87 Mm 3 . It is intended primarily for irrigation and water supply. Kunzvi The proposed Kunzvi, with a storage capacity of 146 Mm 3 , will be constructed on a tributary for the Mazowe river, 40 km east of Harare, for the sole purpose of supplying water to Harare. Its capacity of will provide an appreciable but limited potential flood attenuation. It is already under construction although construction is proceeding intermittently due to erratic funding. 4.3.3 Mozambique (Luia, Revubué, Muira) Several tributaries flowing in Mozambique have been identified by ARA-Zambeze. For this study possible dam sites were investigated using satellite imagery and dam engineering expertise. The knowledge that flow gauges are generally stationed at sites that are technically suitable for dams, added to a first selection. The possible dam sites are listed in Figure 4.3 and dam characteristics are given in Table 4.4. Table 4.4 Possible dam sites on unregulated tributaries in Mozambique identified in this study Dam Characteristics Sub-Project Tributary Reservoir Long. Lat. Capacity H (m) (Mm 3 ) Luia Luia 1 32.977 º 15.543 º 5600 120 Luia 2 32.929 º 15.439 º 2700 90 Luia 3 32.842 º 15.341 º 300 50 Revubué Revubué 33.788 º 15.878 º 8000 90 Luenha Luenha 1 33.715 º 16.428 º 2000 50 11000 80 Luenha 2 33.437 º 16.527 º 4400 50 Muira 18.843 34.107 2000 50 38
DAM SYNCHRONISATION AND FLOOD RELEASES IN THE ZAMBEZI RIVER BASIN: ANNEX 4 OF FINAL REPORT Figure 4.3: Potential dam sites on unregulated tributaries in Mozambique Luia The Luia flowing into the Zambezi on the left bank, just downstream of Cahora Bassa is reported as a tributary contributing to flood flows. Three potential dam sites have been identified. A general feature of the sites on the Luia is the narrow nature of the gorges all along its course, such that and none of the identified dam sites could provide a significant storage capacity. Luia dam site no.1 This site is located approximately 4.8 km upstream of the confluence with the Zambezi. It would be suitable for a 120 m high wall. This dam would catch the water of nearly the whole catchment. This site is within the area of influence of the backwater curve of the Mphanda Nkuwa. Luia dam site no.2 This site is located approximately 17.6 km upstream of the confluence with the Zambezi and 2.3 km downstream of the confluence of the Cherisse with the Luia. This site would be suitable for a 90 m high wall. This site would also catch the run-off of nearly the whole catchment. 39
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