Ayalew, Semu(PhD)Kidus, Abebe2018-07-182023-11-112018-07-182023-11-112014http://etd.aau.edu.et/handle/12345678/9155This study was conducted to analyze the water balance of the eastern Nile river basin and simulate the Evaluation of the Great Ethiopian Renaissance dam (GERD) on downstream water use. The simulation is based on different existing and under constructed water use sectors with different scenarios. A study was conducted on water allocation modeling of Awash River Basin, Ethiopia, using MODSIM, a river basin management decision support system (DSS) designed as a computer-aided tool for developing improved basin wide planning. Eastern Nile river basin includes many reservoirs and swampy lands but in this study considering high Aswan dam, Merowe dam and Great Ethiopian renaissance dam. Four scenarios were set: Scenario I base line scenario with present withdrawal rate in the basin; Scenario II- normal flow impounding scenario during the filling period of Great Ethiopian renaissance dam the period of 2014.2019 ; Scenario III Scenario II Dry flow impounding scenario during the filling period of Great Ethiopian renaissance dam the period of 2014.2019 this is the rare case scenario under the impounding periods ; and Scenario IV-the long term future Scenarios considering Great Ethiopian Renaissance Dam. Analysis of flow records within the basin was done for a period of 1953–2003 for 47 years of monthly average stream flow, reservoir characteristics, and water use data of the basin. Simulation was conducted based on four scenarios. Consumptive and non-consumptive uses were considered in allocation modeling. KEY POINTS: - Nile river basin, Blue Nile river basin, Great Ethiopian Renaissance dam (GERD), Merowe, High Aswan Dam (HAD), MODSIM, simulation, scenarioenNile River BasinBlue Nile River BasinGreat Ethiopian Renaissance Dam (GERD)MeroweHigh Aswan Dam (HAD)Modsim SimulationScenarioThesis