I had written on this topic sometime ago. My present research on dams and malaria in Africa triggered me to invoke some more thoughts (http://www.malariajournal.com/content/14/1/339). Several dams are under construction in sub-Saharan Africa. According to FAO database, some 118 dams are currently under construction while several more are planned. My analysis indicated that over half (57%) of these dams are located in areas with unstable/seasonal malaria. Previous studies indicated that dams in unstable semi-arid areas intensify malaria transmission.
Solomon Kibret's blog
In recent years, there seems to have a boost in construction of large dams and irrigation schemes in sub-saharan Africa, mainly in Ethiopia. With recognition of such infrastructures to ensure economic development and allevate poverty, Ethiopia is building large dams and constructing large irrigation schemes in parts of the countries where malaria is endemic. However, such water infrastructures have been shown to intensify malaria transsmission in communities living close to water storages.