(SFGate) - October marked 20 years since the Central Valley Project Improvement Act, a water project aimed at restoring the Sacramento-San Joaquin River Delta, went into effect. After many years of damage caused by water diversions from the delta, Congress acted to fix some obvious problems. Rep. George Miller, D-Martinez, and former U.S. Sen. Bill Bradley, a Democrat from New Jersey, deserve the credit for getting this law passed.