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ABSTRACT
Climate change is altering the hydrology cycle, affectin stream flow patterns worldwide. This project aims to delineate a watershed in Udu LGA, analyse the historical trends of rainfall and temperature of the region and build and interpret a SWAT model for the watershed. The watershed was delineated using SWAT, an hydrological model that simulates the impact of land management practices on water, sediment and agricultural chemical yields in large complex watersheds.Due to the absence of meteorological station in Udu local government area, past precipitation data and temperature was obtained from climate engine, a web-based platform that provides climate and environmental data. A SWAT model was built and interpreted for the watershed and the results which include in sediment in and out, flow in and out and dissolved oxygen in and out. The result shows a delineated watershed which showed subbasins, streams and reaches, the temperature showed a slight increase overtime and the rainfall showed a massive decline over the years which could be as a result of deforestation and urbanization. When the datas were inputed into the it showed there was decline in the soil water content of the watershed, slight increase in the evapotranspiration of the watershed, slight increase in the surface runoff of reaches, slight increase in the flow-in and flow-out data slight increase in the sediment-in and sediment-out data, decrease in the total dissolved solids and dissolved oxygen-in and dissolved oxygen-out remained constant. These results obtained asses the impact of climate variables on streamflow in Udu watershed. From the results obtained conclusion was made and several recommendations was also made to prevent harsh climate repercussions on Udu LGA
