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Ecological functionality of the Upper and Middle Vaal Water Management areas

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dc.contributor.author Otieno, Fredrick Alfred O.
dc.contributor.author Ochieng, George M.
dc.contributor.author Dzwairo, Bloodless
dc.date.accessioned 2012-12-05T10:56:34Z
dc.date.available 2012-12-05T10:56:34Z
dc.date.issued 2012-12-05
dc.identifier.uri http://hdl.handle.net/10321/792
dc.description.abstract A harmonised in-stream water quality guideline was constructed for the Upper and Middle Vaal Water Management Areas (WMAs) using ideal catchment background values for the sub-catchments; Vaal dam, Vaal barrage, Klip River and Blesbokspruit/Suikerbosrant Rivers. Data for years 2003 to 2009 was interpolated to a daily time-step for 2526 days at 21 monitoring sites covering both WMAs. Conductivity was used as a surrogate to capture the variability in water quality. This provided an ecological functionality model of the study area, coded for ranges 10-18, 19-45, 46-80, 80< and 81-100 mS/m. The Upper and Middle Vaal basin is currently extremely vulnerable to changes in water quality, uncertainty about changes which it can tolerate, and the fact that there are very limited options for mitigating effects of poor water quality in the basin, overall. Thus a precautionary approach is being proposed in this paper, in order to protect the ecological functionality of the aquatic ecosystem. The proposed harmonised guideline presents a crucial model to pre-determine the ecological functionality for any water point in the study area, in order to provide upstream-downstream pollution trading and other decision support processes towards sustainable basin management en_US
dc.format.extent 21 p en_US
dc.language.iso en en_US
dc.subject Water quality en_US
dc.title Ecological functionality of the Upper and Middle Vaal Water Management areas en_US
dc.type Article en_US


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