Hydrological characterization of the Marahoué watershed (Bandama, Ivory Coast)

This study carried out on the Marahoue (Bandama) watershed at the Bouafle hydrometric station (Cote d'Ivoire) aims to characterize climate variability and its impact on the variations and availability of water resources in the watershed of the Marahoue (Bandama) in Ivory Coast. This characterization was based on the use of rainfall, thermometric and hydrometric (flow) data collected over the period 1961-2017. Thus, several methods were used (standard index of normalization, Lang method and Maillet's law). There is a decrease in precipitation and flow, however the temperature is rising. A low storage capacity of soil reservoirs in the Marahoue watershed (Bandama) has been demonstrated. Thus, low groundwater reserves were evaluated characterized by a low average drying off coefficient of 3,4.10-2 j-1, a short drying period of nearly a month and a low volume of water mobilized by the aquifers of 0.92 Km3.