| 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 2.12 |
| Main Rivers | Steelpoort & tributaries, Olifants & tributaries |
| Terrain morphology: Broad division | 1. Open hills, lowlands, moderate relief. 2. Closed hills, mountains, moderate to high relief. |
| Vegetation types | Mixed bushveld |
| Altitude (m a.m.s.l) | 800-1000; 1000-1250; 1250-1500 |
| Geology | Hornblende and biotite granite, granophyre, quartzite, shale, basalt, andesite, conglomerate |
| Soils | Mostly coarse, sandy & shallow |
| Mean annual precipitation (mm) | 400-600; 600-800; 800-1000 (limited) |
| CV (%) of annual precipitation | 20-25 (limited); 25-30; 20-25 (limited) |
| Rainfall concentration index (%) | 50-55 (limited); 55-65 |
| Rainfall seasonality | Early summer (peak December or earlier) |
| Mean annual temperature ( ºC) | 16-18; 18-20 |
| Range of median annual runoff (mm) for quaternary catchments (natural, simulated)* |
40-60 (limited); 60-80; 80-100; 100-150 (limited) |
| CV (%) of annual simulated runoff for quaternary catchments | 50-60; 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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