| RHP |
South African
River Health Programme |
Ecological State of the Major Rivers of Mpumalanga |
|
Level II Ecoregions |
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| Main Attributes | Ecoregion 3.03 |
| Main Rivers | Elands & Olifants tributaries |
| Terrain morphology: Broad division | Plains, low relief |
| Vegetation types | Clay thorn bushveld |
| Altitude (m a.m.s.l) | 1000-1250; 800-1000 |
| Geology | Basalt, tuff, breccia, rhyolite |
| Soils | Black or red vertic clays (derived from basalt) |
| Mean annual precipitation (mm) | 400-600 |
| CV (%) of annual precipitation | 25-30 |
| Rainfall concentration index (%) | 60-65 |
| Rainfall seasonality | Early summer (peak December or earlier) |
| Mean annual temperature ( ºC) | 18-20 |
| Range of median annual runoff (mm) for quaternary catchments (natural, simulated)* |
20-40; 40-60; 60-80 (limited) |
| CV (%) of annual simulated runoff for quaternary catchments | 60-70; 70-80; 80-90 |
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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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