President Trump on Tuesday signed the plan outlining how Arizona and other Colorado River basin states will divide up the limited water that’s now available.

The latest agreement will allow the City of Phoenix to store water in underground storage facilities on Gila River Indian Community land in exchange for supporting the revitalization of the Gila River through various diversion projects.

An employment lawsuit is pitting two of the state’s largest actors on water issues against each other, and some say its outcome could complicate Arizona’s efforts to manage its water and prepare for drought.