Its been oft stated over the last 10 years that the next strategic war would be about water.Two interesting articles.
While not revealing anything most who study the area don't already know regarding the military, it did bring out some interesting information that , for me, was new.
Fresh water is as important as oil to the Gulf Region.
One scenario is for Iran to attack the desalination plants along the Gulf, threatening nations allied to the United States. Saudi Arabia obtains nearly 70% of its fresh water from these plants. However, Iran also has this vulnerability.
india pakistan afghanistan china all have similar issues with the dams/rivers crossing borders etc
sauidi arabia and iraq have similar problems (iraq traditionally less depending on history and when "who owned what"