| 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 5.05 |
| Main Rivers | Selati, Groot Letaba, Klein Letaba |
| Terrain morphology: Broad division | 1. Open hills, mountains, moderate relief.
2. Closed hills, mountains, moderate to high relief |
| Vegetation types | Sour lowveld bushveld |
| Altitude (m a.m.s.l) | 1000-1250; 800-1000; 600-800 |
| Geology | Iron, jaspilite, syenite, hornblende granite, foskorite, gneiss |
| Soils | Sandy to sandy loam to clayey |
| Mean annual precipitation (mm) | 400-600 (limited); 600-800; 800-1000; 1000-1200; >1200 |
| CV (%) of annual precipitation | <20; 20-25; 25-30 |
| Rainfall concentration index (%) | 60-65 |
| Rainfall seasonality | 1. Limited: Early summer (peak December or earlier)
2. Midsummer (peak January) |
| Mean annual temperature ( ºC) | 16-18; 18-20; 20-22 |
| Range of median annual runoff (mm) for quaternary catchments (natural, simulated)* |
40-60; 60-80; 80-100; 100-150; 150-200 |
| CV (%) of annual simulated runoff for quaternary catchments | 80-90; 90-100; 120-140; >160 |
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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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