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DAM SYNCHRONISATION AND FLOOD RELEASES IN THE ZAMBEZI RIVER BASIN: ANNEX 4 OF FINAL REPORT Sub-Project Gwayi Gwayi Shangani Gwayi Umguza Table 4.2: Possible dam sites in Gwayi and Shangani catchment (ZINWA, 2010) Tributary H Lat. Long. (m) º S º E Dam Characteristics Live Storage Capacity (Mm 3 ) Expected Yield (Mm 3 /annum) Gwayi 70.0 18.551 27.219 635 57 Estimated Cost (2005) (Million US$) Gwayi 19.498 27.768 195 30 83 Bubi Lupane Bubi 20.0 18.922 27.719 40 11 10 Sanyati Kudu Munyati 72.7 18.262 29.383 1,550 380 160 Table 4.3: Possible dam sites in Mazowe catchment, contributing to diminished flows in the Luenha (ZINWA, 2010) Sub-Project Mazowe Tributary H Lat. Long. (m) º S º E Dam Characteristics Live Storage Capacit y (Mm 3 ) Expected Yield (Mm 3 /annum) Estimated Cost (2005) (Million US$) Chitse Ruya unknown 16.707 31.611 290 140 140 Silver Msengezi 47.0 16.762 31.196 140 33 190 Stroom Bindura Mazowe 44.0 17.263 31.281 87 36 90 Kunzvi Mazowe 146 100 67 Gwayi Gwayi Shangani ZINWA has indicated that for the Gwayi, the Gwayi Shangani dam with a storage capacity of 635 Mm 3 seems most feasible and will contribute to flood control (interview 28 April 2010). Located at the confluence of the Shangani with the Gwayi, it controls an important part of the Gwayi catchment (nearly 39 000 km 2 ). ZINWA indicated that dam construction is in progress at this site, with the contractor already on site for construction of the scheme. but unfortunately the project is currently suspended due to financial reasons. Its sizeable live storage capacity of 635 Mm 3 will provide a significant flood attenuation effect. The main purpose of this dam is to supply water to Bulawayo, some 270 km south west of the dam site. The hydropower capacity of this dam is a mere 2 MW and would be primarily used to supply power to the pumping station required to convey the water to Bulawayo. A possibility of doubling the hydropower capacity through some redesign was also mentioned. Thus, the dam would combine water supply and hydropower generation. To serve for flood protection also, would need an additional objective in 36
DAM SYNCHRONISATION AND FLOOD RELEASES IN THE ZAMBEZI RIVER BASIN: ANNEX 4 OF FINAL REPORT the operating of the dams and has to be weighed against the disadvantages for water supply and hydropower. Gwayi Umguza The Gwayi Umgasi scheme is located at the confluence of the Umguzi River with the Gwayi, some 115 km north west of Bulawayo, controlling a catchment of 8 000 km 2 . According to the Large Dam Site Data record from the Ministry of Water Development in Zimbabwe (last updated in 1981), some prefeasibility investigation have been carried out. However no further information has been found on this scheme. Bupi Lupane Bupi Lupane is a dam located near Lupane, along the A8 road between Bulawayo and Victoria Falls. It is currently under construction and nearly completed. The dam will control a large catchment on the Gwayi River upstream of the Gwayi Shangani dam. Its live capacity is approximately 40 Mm 3 which will provide some, albeit minor, flood attenuation effect. Sanyati Kudu dam, on the Sanyati river has potential to make a considerable contribution to flood protectionith a storage capacity of 1550 Mm 3 . Only preliminary designs of the dam have been carried out to date. Other dams planned by ZINWA in the Sanyati catchment are the Muda, Mhondoro, Chivhu and Shavi dam. The Muda dam is located 50 km south of Harare for irrigation. The catchment that it controls is fairly small and very little flood attenuation effect can be expected for the scheme. It is therefore not a cost effective investment with respect to flood protection. The Mhondoro dam has a fairly large storage capacity of 450 Mm 3 . This dam located about 30 km downstream from the Muda dam site was the subject of a feasibility study. However, because of the limited upstream catchment area, this dam is also not suitable for flood control. The Mhondoro dam has a larger catchment area (3500 km2) than the Muda dam (950 km2) and a larger storage capacity, therefore would have more impact on flood control. Chivhu and Shavi dam are too small for meaningful flood control purposes with respectively 23 and 5 Mm 3 live storage capacity. Mazowe The Mazowe River flowing from the north eastern part of Zimbabwe into Mozambique, where its name changes to the Luenha, discharging into the Zambezi between the site of the proposed Boroma and Lupata dams. Chitse There is no detailed information availableon this site Silverstroom This dam is planned for construction on the Msengezi river which discharges directly into the Cabora Basa. With a design capacity of 140 Mm 3 this dam has been planned primarily for irrigation purposes. 37
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