The dominant factors that determine the drainage systems in Ethiopia are influenced by both natural and human factors. Here are some of the key factors: 1. Topography: The drainage patterns in Ethiopia are largely determined by the country's diverse topography. The presence of high mountains, plateaus, and escarpments influences the flow of water and the formation of river systems. The steep slopes of the Ethiopian Highlands contribute to the formation of numerous fast-flowing rivers with deep gorges. 2. Climate: Ethiopia has diverse climatic zones ranging from arid and semi-arid regions to highland areas with a more temperate climate. The distribution and intensity of rainfall affect the volume of water in rivers and the formation of drainage basins. The highland areas receive relatively higher amounts of rainfall, resulting in the formation of well-developed river systems. 3. Geology: The geology of Ethiopia plays a significant role in determining the drainage patterns. Different types of rocks and soil formations have varying permeability, which affects the rate of water absorption and the formation of underground aquifers. The presence of impermeable rocks can lead to the formation of surface runoff and the development of specific drainage patterns. 4. Tectonic activity: Ethiopia is located in the East African Rift System, which is an active tectonic zone. The rift system has influenced the formation of deep valleys and grabens, which act as natural drainage pathways for rivers. Tectonic activity can also cause the uplifting of land, creating barriers and influencing the direction of water flow. 5. Land use and vegetation: Human activities such as deforestation, agriculture, and urbanization can significantly impact the drainage systems in Ethiopia. Deforestation reduces the natural water-holding capacity of the soil, leading to increased surface runoff and erosion. Changes in land use can alter the natural flow patterns of rivers and result in the formation of artificial drainage systems. 6. Hydrological infrastructure: The construction of dams, reservoirs, and irrigation systems can modify the natural drainage patterns in Ethiopia. These infrastructure developments can regulate the flow of water, redirect river courses, and create artificial reservoirs, which may have both positive and negative impacts on the drainage systems. It's important to note that the dominant factors influencing drainage systems can vary across different regions of Ethiopia due to the country's diverse geography and climatic conditions.