eng Science and Education Publishing American Journal of Water Resources 2333-4819 2023-10-23 11 4 149 157 10.12691/ajwr-11-4-4 AJWR20231144 article Sawadogo Zounabo Epouse Kouyate k_zeynab@yahoo.fr 1 Soro Gneneyougo Emile 2 Kouakou Koffi Abdelaziz 3 Goula Bi Ti¨Ļ Albert 3 Brou Yao Casimir 4 Agropastoral Management Institute, Peleforo Gbon Coulibaly University, Korhogo, C?te dĄ¯Ivoire Geosciences and Environment Laboratory, Nangui Abrogoua University, Abidjan, C?te dĄ¯Ivoire Department of Geoscience, Peleforo Gbon Coulibaly University, Korhogo, C?te dĄ¯Ivoire Research and Innovation Unit of Agronomic Science and Rural Engineering, Houphouet Boigny National Polytechnic Institute,Yamoussoukro, C?te dĄ¯Ivoire Rainfall decline trend observed since 1970s in Côte dĄ¯Ivoire is still putting a strain on the annual recharge of dams and the satisfaction of crop irrigation water requirements. The aim of this study is to analyze the hydrological functioning of the Nanan agricultural dam in a context of climate variability. Several approaches were used to collect the data, including direct measurements, visual observation, surveys, interviews, and documentary research. The method used for the water balance was the principle of volume conservation (continuity equation), applied over two years (2016, 2017). This analysis shows that runoff accounts for 92% of the annual recharge of the Nanan dam. Of the water mobilized, 63% was used for irrigation, and uncontrollable losses amounted to 38%, of which 25% by infiltration and 12% by evaporation. The variation in annual stock was different from one year to the next, with a variation of -104,000 m3 in 2016 and +165,000 m3 in 2017. In short, the hydrological regime of the dam is closely linked to the rainfall regime. This characterisation could be used in a future climate projection simulation to analyze the impact of climate change on the dam's capacity to meet crop water requirements. http://pubs.sciepub.com/ajwr/11/4/4/ajwr-11-4-4.pdf climate change hydrological regime water balance irrigation Yamoussoukro