ABSTRACT
This chapter explores the use of tracers and water quality to quantify runoff components in a selected sub-catchment of the Incomati, the Kaap catchment. First, spatial and temporal variability of water quality in the catchment is described, and suitable data for hydrograph separation is identified. Then, chemical hydrograph separation is applied using electrical conductivity as a tracer. Furthermore, a recursive digital filter is applied to quantify baseflow using only daily streamflow data. The digital filter parameters are then calibrated using chemical hydrograph separation as a reference. Baseflow and quickflow components are then quantified at monthly and annual scale, using the calibrated digital filter approach. This information is then used to improve understanding of how baseflow is generated and how it contributes to streamflow throughout the year. Implications of this finding for water management are also discussed.
