tendance (1) température (1) eau de surface (1) spectacle (1) fleuve (1) plaine (1) affectation des sols (1) lac (1) analyse (1) inondation (1) crue (1) évolution (1) bassin versant (1) ordre (1) profession (1) Context (1) Observations (1) Observations (1) Year (1) Will (1) Water (1) Temperature (1) Surfaces--Areas and volumes (1) Surfaces (1) Series (1) Sahel (1) Sahara (1) Rain and rainfall (1) Order (1) Natural resources (1)