Sudan Renews Warning on Nile Dam, Moves to Avert Water Shortages Jul 29 2021, 3:47 PM July 28 2021, 6:59 PM July 29 2021, 3:47 PM (Bloomberg) -- (Bloomberg) -- Sudan renewed its warning of the dangers posed by Ethiopia operating a giant hydropower dam on the Blue Nile river without a binding agreement, as it tries to mitigate the effects of the latest reservoir filling. Without proper cooperation on its operation, the Grand Ethiopian Renaissance Dam could threaten the well-being of half of Sudanâs population, Irrigation Minister Yasser Abbas said Wednesday, repeating his countryâs refusal to rejoin talks on the project until international mediators are added.