A bill that could save money for rural ranchers who divert water by easing a state regulation is awaiting Gov. Jerry Brown’s signature. The California Cattlemen’s Association-backed legislation by Assemblyman Frank Bigelow, R-O’Neals, would change a State Water Resources Control Board rule that those who divert more than 10 acre-feet of water per year hire a licensed engineer to install a water-measuring device. Assembly Bill 589 would allow diverters to instead install their own devices or implement their own measurement method if they take a course from the University of California Cooperative Extension, CCA officials explain.