1 Smakhtin, V. Y.; Watkins, D. A. 1997. Low flow estimation in South Africa û Final report to the Water Research Commission on the project ôClassification and hydrological modelling of low flows in Southern Africaö by the Institute for Water Research, Rhodes University, Grahamstown, South Africa. Pretoria, South Africa: Water Research Commission. v.p. (WRC report no.494/97 / IWR report no.1/97)