Tanzania: Water future

In  addition,  the  deterioration  of  the Wami-Ruvu  River  Basin, which  supplies  the  city  with  water from the Uluguru Mountains, is also a cause for concern. Deforestation, largely unregulated abstractions, poor land and water use practices, illegal alluvial gold mining and direct pollution are all causing significant risks to downstream users. The high likelihood of increasing floods and droughts as a result of climate change, coupled with ambitious government plans for irrigation and power generation in the Wami-Ruvu River Basin makes the short to medium term situation very uncertain for the city’s water users.
http://www.water-futures.org/countries/tanzania.html