wow! How is that even possible. Talk about controlling.
You control the water supply, you control the people.
Though I'm no expert, likely the issue is that people who own sufficient amounts of land could collect sufficient rainfall off of their land to drain what few reservoirs of water exist out west, affecting even land beyond their own borders. It is a mite more complex than simple control.
But an extensive reservoir set-up complete with 10- and 20-foot-tall dams is verboten without the proper, state-issued water-right permits — after all, Oregon law dictates that water is a publicly owned resource
makes sense i guess, but still pretty dumb