Koné S. auteur aut IRD Mahé Gil auteur aut IRD Bamba F. auteur aut IRD Paturel Jean-Emmanuel auteur aut IRD Dezetter Alain auteur aut IRD Servat Eric auteur aut IRD text conferencePaper eng text/pdf reformatted digital access 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. specialized 062MECEAU06 IAHS : International Association of Hydrological Science, 11., Wallingford (GBR), 2022/05/29-2022/06/03 IAHS2022-80 [1 ] Wallingford IAHS 2022 https://www.documentation.ird.fr/hor/fdi:010096655 10.5194/iahs2022-80 [F B010096655] https://www.documentation.ird.fr/hor/fdi:010096655 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2026-03/010096655.pdf IRD - Base Horizon / Pleins textes 2026-03-05 2026-03-18 fdi:010096655 fre