FILE PHOTO: The Blue Nile flows into Ethiopia's Great Renaissance Dam in Guba Woreda, some 40 km (25 miles) from Ethiopia's border with Sudan, June 28, 2013. Egypt fears the $4.7 billion dam, that the Horn of Africa nation is building on the Nile, will reduce a water supply vital for its 84 million people, who mostly live in the Nile valley and delta. Picture taken June 28, 2013. REUTERS/Tiksa Negeri/File Photo
The Blue Nile as it flows into Ethiopia's Great Renaissance Dam close to Ethiopia's border with Sudan. REUTERS

Egypt-Ethiopia water dispute needs international mediation