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The massive hydropower dams built on the Zambezi River, the largest river system in Southern Africa, not only supply power to major economies in the region but also help mitigate annual floods. But as electricity demands grow and rising global temperatures affect rainfall patterns, the dams will be unable to meet energy needs or control floods, warns a new study. The study, 'A Risky Trip for Southern African Hydro', was conducted for the NGO, International Rivers by Richard Beilfuss, a hydrologist and environmentalist who teaches at the University of Wisconsin-Madison College of Engineering in the US and the University of Eduardo Mondlane in Mozambique.