ABSTRACT
Rainfall-runoff analysis is used to transform groundwater, sub-surface and surface water produced in the different parts of the drainage basin into a hydrograph at the basin outlet.
In the past, rainfall-runoff analysis referred to the transformation of net rainfallobtained at every point of the drainage basin by applying an appropriate method to determine rainfall excess-into a direct runoff hydrograph at a given station of the hydrographic network. More recently, the need for continuous simulation of the hydrological behavior of drainage basins, in particular during fl ood and low-fl ow periods, has extended the domain of rainfall-runoff analysis to include the generation of all components of streamfl ow observed at a given hydrometric station (e.g., surface runoff, groundwater and sub-surface fl ows).
