Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Comptes Rendus Géoscience 418-429 Benin groundwater hydrochemistry hydrodynamics tropical river 2007 fdi:010040729 FRE Comptes Rendus Géoscience 1631-0713 CC:0002485279-0005 6 10.1016/j.crte.2007.04.003 https://www.documentation.ird.fr/hor/fdi:010040729 https://www.documentation.ird.fr/intranet/publi/2007/10/010040729.pdf 339 Horizon (IRD) Hydrological processes and water balance of a tropical crystalline bedrock catchment in Benin (Donga, upper Oueme River). Hydrodynamic, geochemical, and subsurface geophysical investigations, for two consecutive years with contrasting rainfall 2 conditions, were used to characterize the hydrological processes occurring, and the water balance of a 586-km(2) watershed in Benin (Africa). The water table's monitoring shows that recharge occurs by direct infiltration of rainfall, and represents between 5 to 24% of the annual rainfall. Both surface water outflow, limited to the rainy season, and water chemistry indicate a weak groundwater contribution to river discharge. This implies that the calculated variations in annual runoff coefficients (of 14 and 28%) are mainly governed by surface and subsurface flows. To cite this article: B. Kamagati et al., C. R. Geoscience 339 (2007). 062