As reported by the BBC, 4.9 billion cubic meters of water are enough to test both turbines. As a consequence, it will not be capable of reserving the planned 13.5 billion cubic meters in the current flood season. The maximum that can be held back is four billion cubic meters making the total amount in the reservoir just eight billion cubic meters. At first, the reservoir's capacity of the dam was set to be 11 billion cubic meters. That will leave nothing to Egypt and Sudan whose annual shares are 55.5 billion cubic meters and 18.5 billion cubic meters, respectively.

Source: Egypt Today July 09, 2021 12:12 UTC