Hello Ansoumana Bodian,

You may want to check these articles: DOI:10.1016/j.jhydrol.2013.07.012 and DOI:10.1175/JHM-D-12-032.1. They describe how to assess and validate satellite products for hydrological applications in Africa.

Thanks the paper is very usefull

Have a look to this interesting, and open access, paper: http://onlinelibrary.wiley.com/doi/10.1111/jawr.12140/abstract

Before using satellite rainfall data into hydrological model a bias correction and recalibration step are usually required.

Good luck with your research!