| 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 4.04 |
| Main Rivers | Olifants, Blyde, source Klaserie, Selati tributaries |
| Terrain morphology: Broad division | Closed hills, mountains, high relief |
| Vegetation types |
1. Sour lowveld bushveld,
2. Mixed lowveld bushveld (central area) 3. Patches Afromontane forest |
| Altitude (m a.m.s.l) | 400-600; 600-800; 800-1000; 1000-1250; 1250-1500 |
| Geology | Quartzite, shale, basalt, andesite, conglomerate, sandstone, , iron, jaspilite, syenite, hornblende granite, foskorite, gneiss iron, jaspilite, syenite, hornblende granite, foskorite, gneiss |
| Soils | Deep, predominantly sandy to sandy loam to clayey;coarse, sandy & shallow;well-developed & mature soils (may be leached) |
| 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 (%) | 55-60; 60-65 |
| Rainfall seasonality | Early summer (peak December or earlier) |
| Mean annual temperature ( ºC) | 16-18; 18-20; 20-22 |
| Range of median annual runoff (mm) for quaternary catchments (natural, simulated)* |
40-60 (limited); 60-80; 80-100; 100-150; 150-200; >250 |
| CV (%) of annual simulated runoff for quaternary catchments | 60-70; 70-80; 80-90; 120-140 |
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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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