Around the world, in particular in Benin and more precisely in the town of Athiémé, floods,
caused by high floods or by the overflow of the Mono River as was the case in September 2016,
cause great social and economic damage. The main objective of this work is to study the floods
in the Mono basin at the Athiémé outlet thanks to the GR2M model.
The methodological approach used consisted in the collection and processing of rainfall and
hydrological data over the period from 1965 to 2011. These different data are processed by
descriptive statistical methods and applied in the GR2M model.
The Nash values obtained during the application of GR2M on the Mono to Athiémé, vary from
73% to 88.6% in calibration, and from 67.9% to 93.7% in validation. This study therefore made
it possible to note that hydrological fluctuations are sensitive to rainfall forcing, and that rainfall
variability has a great impact both on the flow and on recharge and evaporation. In addition, the
GR2M model is effective in simulating floods on the Mono in Athiémé

Basin, floods, model, simulation, flow, recharge, evaporation.