Abstract
The water budget and the hydrological processes within the Bisley catchment have been studied in detail prior to performing a modelling study using a fully distributed model (TOPOG). Interception losses in the Bisley catchment are very high. For the period between 5 May and 9 July in 1996 interception losses amounted to 52% of gross precipitation. Interception losses were modelled satisfactorily using the Rutter model but only after optimizing (increasing) the value for the wet-canopy evaporation that was derived from the Penman-Monteith equation.Hydrochemical and hydrometric techniques were used to investigate the runoff generating processes within the catchment. It is shown that most quick flow in this catchment travels through macro pores in the top 60 cm of the soil profile. Saturation overland flow accounts for a smaller part of the quick flow and occurs only in valley bottoms. Thus, if quick flow is to be modelled according to the actual process in this catchment, a model should include lateral flow through macro pores.
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