RHP
South African
River Health Programme
Ecological State of the Major Rivers
of Mpumalanga
Level II Ecoregions
Main Attributes
Ecoregion 5.01
Main Rivers
Letaba
Terrain morphology: Broad division
Plains, low relief
Vegetation types
Mopane shrubveld
Altitude (m a.m.s.l)
300-400; 200-300
Geology
Basalt, tuff, breccia, rhyolite
Soils
Very clayey, often vertic or near vertic
Mean annual precipitation (mm)
400-600; 600-800 (limited)
CV (%) of annual precipitation
25-30; 30-35
Rainfall concentration index (%)
60-65; >65
Rainfall seasonality
Midsummer (peak January)
Mean annual temperature ( ºC)
>22
Range of median annual runoff (mm) for
quaternary catchments (natural, simulated)*
60-80; 80-100 (limited)
CV (%) of annual simulated runoff for quaternary catchments
60-70; 70-80; 80-90; 90-100
After: Schulze
et al.
1997; Low & Rebelo 1996; van Riet
et al.
1997
* Based on ACRU model (Schulze
et al.
1997)