Salt Lake Tribune: Change comes hard to Western water policy. The Prior Appropriation Doctrine, interstate compacts, groundwater law, the “law of the river” — all of these seem set in stone in the minds of the region’s policymakers. Of course, the West’s rivers aren’t bound by such a static existence. Indeed, they are changing in fundamental ways, opening a wide chasm between our water policy and our water sources. This is particularly true for the Colorado River Basin. Climate scientists are …