Horizon 1 1 10 C-ACTI : Communications avec actes dans un congrès international IAHS-AISH Scientific Assembly IAHS : International Association of Hydrological Science IAHS2022-80 [1 ] NIGER BASSIN 2022 2022/05/29-2022/06/03 Wallingford IAHS fdi:010096655 ENG 10.5194/iahs2022-80 https://www.documentation.ird.fr/hor/fdi:010096655 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2026-03/010096655.pdf Horizon (IRD) In hydrology, enhancing existing models are good ways to establishing efficient and accurate conceptual frameworks for hydrological simulation's purposes. Methodologically, a framework that has two parameters and three input variables, called SimulHyd, is used in this study to modelling runoff data, on sixteen watersheds of the Niger River and its tributaries, from 1950 to 1999. Purposely, this paper focuses on a model's inter-comparison method, which summarizes, in tables, then in graphics and in maps, the obtained results. We enhance modelling outputs both in modifying the former french's GR2M model to obtain a model called SimulHyd model and in developing a semi-distributed modelling from a lumped modelling approach. SimulHyd stands for Simulation of Hydrological systems. 062MECEAU06