| RHP |
South African
River Health Programme |
Ecological State of the Major Rivers of Mpumalanga |
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Level II Ecoregions |
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| Main Attributes | Ecoregion 7.03 |
| Main Rivers | Sources of Olifants, Klein Olifants, Wilge & Bronkhorstpsruit |
| Terrain morphology: Broad division | 1. Plains, low relief;
2. Plains, moderate relief; 3. Open hills and lowlands, moderate relief |
| Vegetation types | Moist clay highveld grassland |
| Altitude (m a.m.s.l) | 1500-1750 |
| Geology | Basalt, tuff, breccia, rhyolite, sandstone, shale, coal, carbonaceous shale |
| Soils | Mostly clayey, vertic or near vertic; mostly montmorillonitic clays |
| Mean annual precipitation (mm) | 600-800 |
| CV (%) of annual precipitation | 25-30 |
| Rainfall concentration index (%) | 55-60 |
| Rainfall seasonality | Early summer (peak December or earlier) |
| Mean annual temperature ( ºC) | 14-16 |
| Range of median annual runoff (mm) for quaternary catchments (natural, simulated)* |
40-60; 60-80 |
| CV (%) of annual simulated runoff for quaternary catchments | 50-60; 60-70; 70-80; 80-90; 90-100 |
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After: Schulze et al. 1997; Low & Rebelo 1996; van Riet et al. 1997
* Based on ACRU model (Schulze et al. 1997) |
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