**Appendix A**

**Figure A1.** A cluster based on basin experts' professions, in which black triangles are hydrologists, yellow rectangles are socioeconomics, purple crossed circles are environmentalists, red circles are political scientists, and blue diamonds are law experts, where (**a**) are experts response divisions on indicators under factor-#1—natural features, (**b**) factor-#2—socioeconomic needs of basin states, (**c**) factor-#3—the population dependent on the watercourse, (**d**) factor-#4—the effects of water use, (**e**)factor-#5—existing and potential uses, (**f**) factor-#6—costs of conservation & protection, and (**g**) factor-#7—availability of alternative and comparable values.

**Figure A2.** A cluster based on individual basin experts' country of origin, in which black triangles are Egyptian, yellow rectangles are Ethiopians, red circles are equatorial states, and blue diamonds are Sudanese, where (**a**) is experts response division on indicator under factor-#1 called natural features, (**b**) factor-#2—socioeconomic needs of basin states, (**c**) factor-#3—the population dependent on the watercourse, (**d**) factor-#4—the effects of water use, (**e**)factor-#5—existing and potential uses, (**f**) factor-#6—costs of conservation and protection, and (**g**) factor-#7—availability of alternative and comparable values.

**Figure A3.** Mean value of indicators for which basin states were statistically significantly different.

**Figure A4.** The response of Arab league and middle east countries as compared to basin states experts.

#### **References**


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