Abstract
The paper discusses improvements to a catchment model described earlier by the author. The model, which incorporates the Hewlett hypothesis of runoff, is now capable of generating satisfactory daily and hourly values of streamflow and daily values of soil moisture and actual evapotranspiration. The distribution of large runoff residuals is discussed at some length and it is concluded that this may be explained by a combination of identified failures in runoff measurement, man-induced changes in catchment characteristics, and the frequency of occurrence of high-intensity precipitation. Further widespread testing of the model is invited.
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