The Great Ruaha river catchment which is part of Rufiji river basin, covers an area of approximately to 68,000 km2, and encompasses the Usangu area, which has a total area of 20,811 [km.sup.2] in the southwestern part of the country [52,72,73].
The Great Ruaha is a multifaceted basin with mixed multisectoral water applications for sustained irrigation, power generation, and other water-related livelihoods such as fishing and livestock keeping [74, 75].
The rivers feeding Pangani and the Great Ruaha basins have irregular regimes with the average annual precipitation, evaporation, and surface run-off greatly varying geographically depending on whether it is dry or wet season.
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Catchment, Tanzania', paper presented to the workshop on 'Trees, Rain and Politics in Africa', St Antony's College, University of Oxford, 29 September-1 October.