Abstract
This article presents a synthesis of a research carried out on the use of potential evapotranspiration (PE) within rainfall-runoff models. Tests were performed with four rainfall-runoff models over 308 catchments, in order to draw conclusions of relatively general reach. We attempted to answer the three following questions: How to judge the relevance of a potential evapotranspiration formulation at the catchment-scale? Which temporal and spatial resolution of PE is needed for rainfall-runoff modelling? Which atmospheric variables are needed to represent PE as input to rainfall-runoff models? These questions are likely to be of interest for both end-users of rainfall-runoff models and modellers. Our results make us propose a simple potential evapotranspiration formulation to be used as input to lumped rainfall-runoff models.
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