Climate variability and change are expected to change hydrologic conditions and result in various impacts on global water resource systems. Likely impact may be on hydrological processes such as evapotranspiration, water temperature, stream flow volume, soil moisture, timing and magnitude of runoff, and frequency and severity of floods, all these will lead to changes in environmental variables. Climate change is expected to have different impact on socioeconomic development in every country but the degree of impact will differ. According to IPCC developing countries such as those in West Africa will be more vulnerable to climate change. The main driven force behind the economy of West Africa countries is agriculture which is very sensitive to climate change. So understanding the hydrologic response of watersheds to physical (land-use/ land-cover) and climatic (rainfall and air temperature) change is an important component of water resource planning and management, as well as economics.Read more..