| 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 4.03 |
| Main Rivers | Source Selati, Olifants, Blyde, Ohrigstad |
| Terrain morphology: Broad division | Closed hills, mountains, high relief |
| Vegetation types |
1. North-eastern mountian grassland
2. Patches Afromontane forest |
| Altitude (m a.m.s.l) | 2000-2500; 1750-2000; 1500-1750; 1250-1500; 1000-1250 |
| Geology | Quartzite, shale, basalt, andesite, conglomerate, iron, jaspilite, syenite, hornblende granite, foskorite, gneiss |
| Soils | Shallow lithosols, well-developed & mature soils (may be leached) |
| Mean annual precipitation (mm) | 600-800; 800-1000; 1000-1200; >1200 |
| CV (%) of annual precipitation | <20; 20-25; 25-30 |
| Rainfall concentration index (%) | 50-55 (limited); 55-60; 60-65 |
| Rainfall seasonality | Early summer(peak December or earlier) |
| Mean annual temperature ( ºC) | 10-12; 12-14; 16-18; along Olifants: 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; 200-250; >250 |
| CV (%) of annual simulated runoff for quaternary catchments | 40-50;50-60;60-70;70-80;80-90;90-100;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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