ethiopia is said to be the water tower of africa but the country is still suffering from shortage of water. why? explain it​

Ethiopia is located in Africa's Horn where drought and politics are two leading causes of water shortage.The Nile River and its tributaries were split up between the nations surrounding it. However today, some Ethiopian farmers are finding themselves without access to water for irrigation because of the way the river was divided hundreds of years ago. As the rainy season becomes shorter due to global warming, the fields are becoming more sandy and dry, making it harder for Ethiopian farmers to survive.