RHP
South African
River Health Programme
Ecological State of the Major Rivers
of Mpumalanga
Level II Ecoregions
Main Attributes
Ecoregion 2.08
Main Rivers
Elands source, Bronkhorstspruit
Terrain morphology: Broad division
Lowlands, hills, moderate relief
Vegetation types
1. Rocky highveld grassland
2. Moist cool highveld grassland
Altitude (m a.m.s.l)
1250-1500;1500-1750
Geology
Quartzite, conglomerate, shale, andesite.
Soils
Shallow rocky soils;deep red Hutton and yellow Clovelly
Mean annual precipitation (mm)
600-800
CV (%) of annual precipitation
25-30
Rainfall concentration index (%)
60-65
Rainfall seasonality
Early summer (peak December or earlier)
Mean annual temperature ( ºC)
16-18
Range of median annual runoff (mm) for
quaternary catchments (natural, simulated)*
20-40;
40-60;
60-80
CV (%) of annual simulated runoff for
quaternary catchments
50-60;
80-90
After: Schulze
et al.
1997; Low & Rebelo 1996; van Riet
et al.
1997
* Based on ACRU model (Schulze
et al.
1997)