ERRATUM

ERRATUM: Water quality in non-perennial rivers [Water SA 45 (3) 487-500]

Original article: Day JA, Malan HL, Malijani E and Abegunde AP (2019) Water quality in non-perennial rivers. Water SA 45 (3) 487-500. https://doi.org/10.17159/wsa/2019.v45.i3.6746

How to cite: Erratum: Water quality in non-perennial rivers. [Water SA 45 (3) 487-500]. Water SA 46 (2) 330-344. https://doi.org/10.17159/wsa.2020.v46i2.8250

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Froebrich (2005) points out that it is difficult to predict WQ in temporary rivers because of the spatial heterogeneity in catchment processes, which leads to variability in contaminant build-up during the dry period, coupled with variability in the timing and extent of rainfall events. By implication, water chemistry needs to be assessed for each river and plans for managing it need to be based on the empirical data generated. Because of the overall lack of 'dilution capacity' in non-perennial systems an obvious way to protect them is to limit input of both point- and non-point sources of pollutants. An established method for reducing the input of sediments, nutrients and other contaminants into surface waters, especially N-PRs (Rosado et al. 2012) is through the preservation of well-developed buffer strips of natural vegetation (e.g. Macfarlane et al., 2014; Lee and Fisher et al., 2016). It is during floods that large loads of sediment and contaminants enter the rivers (Froebrich, 2005) and it is also under these conditions that riparian vegetation is uprooted and flushed downstream. In very arid areas, though, there may well be no natural riparian vegetation, or the vegetation may consist of well-established trees within the water course, neither of which protects the river from lateral movement of sediments and other pollutants.