An irrigation channel delivers water to farm fields in the Sacramento San Joaquin River Delta near Isleton, California September 3, 2013. California water officials have proposed redesigning two water diversion tunnels planned for the Delta, away from several small towns along the Sacramento River that Delta residents said would be threatened under the existing plan. Water from the tunnels would flow to urban areas in the Silicon Valley, Los Angeles and San Diego and farmers in the San Joaquin Valley. Picture taken September 3, 2013. REUTERS/Robert Galbraith (UNITED STATES - Tags: AGRICULTURE ENVIRONMENT SOCIETY)