The growing population, urbanization, industrialization, and the expansion of new irrigation schemes have increased the depletion of water resources. Climate change exacerbated the situation. Meeting the water supply needs of this fast-growing population requires a new generation tool that considers both demand and supply-side perspectives. This research tries to test and use WEAP-MODFLOW model linked via an interface created by LinkKitchen for integrated water resources management in the

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... Awash sub-basin. The WEAP model was first configured to describe the surface water resources of the basin. The MODFLOW model was then used to represents the groundwater resources. Finally, the surface waterWEAP and the groundwater-MODFLOW models were linked with the help of an interface created using the LinkKitchen tool. The coupled model was calibrated (2000-2005) and validated (2006-2010) with river discharge data from five hydrometric stations. A dynamically linked WEAP-MODFLOW model was used to forecast water resources' future trends through scenario development up to the year 2030. The scenario is structured according to ten scenarios to predict possible impacts on the region's water balance and allocation due to varied water demands. The model evaluates projected water demands and unmet water demands for four water sectors: domestic, industry, irrigation, and livestock. The model results show that the population growth will result in a significant shortage of water in 2030(469.56Mm3), resulting in maximum unmet water demands between January to March. The effects of climate change were analyzed under four climate scenarios: temperature, high precipitation, medium precipitation, and low precipitation scenarios. The climate scenario results indicated that huge water deficiency would occur after 2020 under low precipitation scenarios, while water deficiency will be reduced under medium and high precipitation scenarios. As clearly stated [...]