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The Middle Zambezi Valley has undergone profound hydrological and social changes over the past century for which limited pre-impact studies are available. Floods and droughts have become more frequent in recent years and the poor living in this area are the most vulnerable when either event strikes. The question that comes about is whether the occurence of these extreme hydrological events is a natural cause or human induced as hydrological processes of this area are largely influenced by reservoir operations in the two instream Lakes; Kariba and Cahora Bassa. This book, therefore, sought to...

The headwater catchments of the Rivirivi River basin play a vital role in meeting downstream water resources requirements. In recent years, the Rivirivi River has experienced significant changes in its hydrological regime, including an increased number of zero-flow days. This study was aimed at investigating the effect of traditional water allocation practices in the catchment on environmental flows. The results indicate that there was a considerable difference in average annual stream flow between two identified main periods (between 1963 to 1983 and 1984 to 2004) and zero flows increased...