| Main Page | General Information | Catchment Characteristics | Land and Estuary Uses | Ecology | Water Quality | Mouth dynamics and Estuarine Hydraulics | Climate |
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Physical Features |
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Obstructions |
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Bathymetry |
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Topography |
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Geology |
| Approximately 56% of the Heuningnes catchment was natural, mostly shrubland, grassland, bushland, and wetlands and waterbodies (Zoetendalsvlei). (Ref 2) | |
| The geology of the upper catchment of the Kars River is dominated by Table Mountain Group sandstone, quartzite as well as shale's of the Heuningberg mountain, near Bredasdorp in the south and Bokkeveld shale's in the undulating northern areas. Further downstream, east of Bredasdorp, the river transverses calcified dune sand and coastal limestone of the Bredasdorp Beds. (Ref 2) | |
| Sandstone, quartzite and shales of the Table Mountain Group dominate the geology of the upper catchment of the Nuwejaars River. Post Malmesbury, pre-Cape granite outcrops occur on the south facing slopes of the Heuningnes Mountain. Further downstream near Elim, the Nuwejaars River transverse shale and sandy shale of the Bokkeveld Group, which persists eastwards almost to where, the Nuwejaars River enters Zoetendalsvlei. (Ref 2) | |
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There are two fault lines running almost
east/west, one just south of the Heuningnes mountain and the other just
north of Soetanysberg further south.
From Soetendalsvlei and Nachtwacht almost to the mouth of the Heuningnes River, the drainage system transverses calcified dune sand and coastal limestone of the Bredasdorp Beds. Approximately 2 km from the mouth, the Heuningnes estuary is situated on unconsolidated sand. (Ref 2) |
