What happens after the catchment caught the storm ? Hydrological processes at the small , semi - arid Weatherley catchment , South - Africa

The knowledge of water flow pathways and residence times in a catchment are essential for predicting the hydrological response to a rain storm event. Different experimental techniques are available to study these processes, which are briefly reviewed in this paper. To illustrate this, recent findings from the Weatherley catchment a 1.5 km 2 semi-arid headwater in South-Africa, are reported in this paper. Beside classical hydrometric measurements of precipitation and runoff different experimental techniques were applied to explore flow paths (i.e. soil moisture and groundwater measurements , natural tracers, and 2-D electrical resistivity to-mographies (ERT)).