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A fully integrated hydrologic model of the Koumfab watershed in Northern Togo is used to study the impact of climate change on water resources. Bias-corrected temperature and precipitation from four regional climate models (RCMs) and two greenhouse emissions scenarios are used as climate forcings for the integrated model. Climate projections from the four RCMs indicate a rise (1.4–5.5 °C) in average temperature from the control (1971–2000) to the future period (2031–2060). Projected precipitation follows two contrasting trends with some RCMs predicting an increase (by up to 14%) in mean annual precipitation, while others predict a decline (by up to 14%). These changes in precipitation and temperature have a noticeable effect on groundwater levels and streamflow. The model indicates a decline in groundwater levels for all future climate projections by 1.4–5.7 m. The projected streamflow at the watershed outlet shows increasing (59–332%) and decreasing trends (39–100%).

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