oa Civil Engineering = Siviele Ingenieurswese - The impact of catchment developments on river basin response
The impact of catchment developments on hydrology and water resources is rapidly becoming a major consideration when analysing flow data in South African rivers. In recent years such developments have become more widespread and interbasin transfers in particular have become very important. Fig 1 provides an indication of the magnitude of water transfers in and around the Vaal Dam catchment. With the exception of the Lesotho Highlands transfer, all of the transfer schemes indicated are currently in use. This shows that the natural inflow to the Vaal Dam of approximately 2 000.105 m3/a is already augmented by Over 800.105 m3/a by the year 2020 when the final phase of the Lesotho Highlands scheme is scheduled for completion. The values shown in Fig 1 refer to interbasin transfers that represent only one of many possible developments in a catchment. There are numerous other forms of development that can influence the water resources of an area, some of which will be discussed in subsequent sections.
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