oa Civil Engineering = Siviele Ingenieurswese - An overview of the Orange River Replanning Study
The Orange River basin is the largest river basin in the country and the latest studies show possibilities for using its water even more effectively. The Orange River basin is by far the largest river basin in the country and more than half of its 1 million km2 catchment lies within South Africa, as can be seen in Fig 1. Although the Orange River rises in the east of the country like most other large rivers in South Africa, unlike the others it flows westwards for 2 300 km across the interior plateau before reaching the Atlantic Ocean. From the steep mountainous areas of Lesotho, the catchment topography gradually flattens and progressively assumes the nature of a desert and, near the river mouth, becomes one of the driest areas in the world.
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