Egypt won't risk war, so this is nothing more than bluster. Any attack on Ethiopia's dam would immediately isolate Egypt.
International law deals with the issue of methods and models for dividing international waters between the riparian states. The riparian states have concluded more than 300 treaties and agreements between them, and the United Nations reached the drafting of the Convention on the Law of the Use of International Watercourses in 1997, and among the most important treaties:
1-
The Geneva Convention in 1923 It included:
A- Not to prejudice the rights of other countries in international rivers.
B - Each country enjoys, within the limits of the provisions of international law, the generation of electric energy.
C- The necessity of negotiations regarding the regulation of the exploitation of international waters.
D- The need for an organization to monitor and supervise public security in the international river basin.
2-
The Declaration of the American States in 1933, which included several principles:
A- Recognition of the right of states to exploit their sovereignty over the waters of international rivers, both industrial and agricultural.
B - No country has the right to change the course of the international river without the approval of other riverine countries.
C- Any actions related to international waters, states should notify the countries concerned.
D- In case of disagreement, diplomatic methods and mediation must be resorted to.
Among the most important principles emerging from treaties and agreements in the use of international waters:
1-
The river basin countries are prohibited from carrying out engineering constructions on the waterway that harm the water quotas of the other riparian countries.
2-
Respect the rights acquired by each country in the waters of international rivers.
3- The importance of consultation and agreement between the countries of the river basin to take into account the rights of all countries.
4- Avoiding individual rights and preventing abuse of the right.