A federal appeals court’s decision has taken a step toward lifting a state ban on out-of-state water sales, opening a way for a proposed $3-billion project to pipe water from Oklahoma to Texas. The appeals court accepted a north Texas water district’s argument that Oklahoma’s ban could constitute illegal restraint of interstate commerce. Photo: Dallas Convention & Visitors Bureau Fast-growing Dallas-Fort Worth area wants water from Oklahoma watersheds. (Click to Enlarge Image) Growing Dallas-Fort Worth area wants to bolster supply with Oklahoma water. The Tarrant Regional Water District, a Fort Worth-based utility serving 1.6 million people in 11 counties, is