Abstract
The effects of land use within riverine drainage basins upon the water quality of the river have been known intuitively and qualitatively for many years but have only recently been quantified (Dillon and Kirchner, 1975; Likens et al., 1970, 1977). This has stemmed largely from water quality management requirements in terms of water pollution control legislation, and particularly from the need to be able to predict potential water quality problems arising from the development of catchment areas (Dillon and Rigler, 1974). The effects of catchment land use on the magnitude of nitrogen and phosphorus losses to water courses are of particular significance in view of the importance of these nutrients in determining lake trophic status (McColl el al., 1975; Dillon and Rigler, 1974; Vollenweider, 1971). In Zimbabwe, where stringent water pollution control legislation has virtually eliminated point source inputs of polluting loads of nitrogen and phosphorus (see D. B. Rowe, this volume), diffuse source run-off is becoming a major factor in the creation and maintenance of water quality problems (Thornton, 1980a). The study of Thornton and Nduku (1982) was therefore designed as one phase of an on-going study of the effects of land use on catchment nutrient export.
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Hatherly, R.S., Nduku, W.K., Thornton, J.A., Viewing, K.A. (1982). The effects of urban run-off. In: Thornton, J.A., Nduku, W.K. (eds) Lake Mcilwaine. Monographiae Biologicae, vol 49. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7983-3_7
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