The area study is defined to the North by the 150 mm/y isohyet (2018–2023) and to the South by the 850 mm/y isohyet (1981–1985), reprocessed based on the definition of level 8 of the WWF hydrography, extending the area of interest to include all the basins involved, for that scale of detail. The cut-out thus identified then becomes our study area.