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The model enables the calculation, in daily values, of water transfers (interception by végétation, évapotranspiration, surface runoff, infiltration, percolation, etc.) of the state of the différent phases of the water cycle (water accumulated in the snow cover, in the végétative cover, on the surface, in the zone of aération and in the zone of saturation of the soil, etc.) and of the flow at the outlet of the area (surface runoff, interflow and base flow). The aim of this model is to establish a detailed water balance of a catchment area, to follow its daily évolution and to understand the factors that détermine its nature.This work sets out the concepts and justifies the mathematical functions and relation ships used. A next publication will be devoted to the détermination of parameters, the validity of the model and its applications. HYDROGRAPHIC REFERENCE AREA *With regard averages calculated situated within **In Uccle, blowing at

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Assuming a doubling of the atmospheric CO2 concentration, parameters of an empirical formula for calculating the daily net terrestrial radiation under the climatic conditions of Belgium are determined. The developed method takes into account information yielded by climate models about the CO 2 impacts. Annual regimes of the energy-balance components are calculated for a drainage basin in Belgium. A daily step conceptual hydrological model (developed at the Royal Meteorological Institute of Belgium) was run to estimate the effective evapotranspiration and the soil moisture in the 2 x CO2 case; results of this simulation are compared with the present-day conditions.

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