Harry Verhoeven, who teaches African politics at the University of Oxford, wrote a piece on 13 June 2013 for Aljazeera titled "Why a 'Water War' Over the Nile River Won't Happen." It is a balanced piece that emphasizes the need for regional integration.
In June 2011, he wrote a detailed report for Chatham House titled "Black Gold for Blue Gold? Sudan's Oil, Ethiopia's Water and Regional Integration." I ran it on the blog in 2011; it is worth revisiting. The focus is on the Ethiopia-Sudan relationship, but it is relevant to Ethiopia's relations with Egypt. It contains a complete listing of actual and proposed hydropower projects in Sudan and Ethiopia.