RHP
South African
River Health Programme
Ecological State of the Major Rivers
of Mpumalanga
Level II Ecoregions
Main Attributes
Ecoregion 7.04
Main Rivers
Wilge, Bronkhorstspruit
Terrain morphology: Broad division
1. Plains, low relief;
2. Plains, moderate relief
Vegetation types
Moist cool highveld grassland
Altitude (m a.m.s.l)
1500-1750; 1250-1500
Geology
Quartzite, shale, basalt, andesite, conglomerate
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
CV (%) of annual simulated runoff for quaternary catchments
70-80; 80-90
After: Schulze
et al.
1997; Low & Rebelo 1996; van Riet
et al.
1997
* Based on ACRU model (Schulze
et al.
1997)