Invasive alien plants have a negative impact on ecosystem goods and services derived from ecosystems.
Consequently, the aggressive spread of invasive alien plants (IAPs) in the river catchments of South Africa
is a major threat to, inter alia, water security. The Olifants River catchment is one such a catchment that is
under pressure because of the high demand for water from mainly industrial sources and unsustainable
land-use, which includes IAPs. This study considered the cost-effectiveness of clearing IAPs and compared
these with the cost of a recently constructed dam. The methods used for data collection were semistructured
interviews, site observation, desktop data analysis, and a literature review to assess the impact of
IAPs on the catchment’s water supply. The outcomes of this study indicate that clearing invasive alien plants
is a cost-effective intervention with a Unit Reference Value (URV) of R1.44/m3, which compares very
favourably with that of the De Hoop dam, the URV for which is R2.93/m3. These results suggest that
clearing invasive alien plants is a cost-effective way of catchment management, as the opportunity cost of
not doing so (forfeiting water to the value of R2.93/m3) is higher than that of protecting the investment in the
Makonto, Olma Tsakani(University of Pretoria, 2013-05-27)
The aquifer vulnerability of the Molototsi (B81G) and Middle Letaba (B82D) quaternary catchments was assessed to determine the influence of the vadose zone on the groundwater regime. Anecdotal evidence indicated that the ...
In this study, average monthly and annual rainfall
totals recorded for the period 1970 to 2010 from a network of
13 stations across the Lake Kariba catchment area of the
Zambezi river basin were analyzed in order to ...
In this paper, monthly, maximum seasonal, and maximum annual
hydrometeorological (i.e., evaporation, lake water levels, and rainfall) data
series from the Kariba catchment area of the Zambezi River basin, Zimbabwe,