FIREBAUGH, CA - APRIL 24: Shells remain on dry cracked earth that used to be the bottom of an irrigation ditch on April 24, 2015 in Firebaugh, California. As California enters its fourth year of severe drought, farmers in the Central Valley are struggling to keep crops watered as wells run dry and government water allocations have been reduced or terminated. Many have opted to leave acres of their fields fallow. (Photo by Justin Sullivan/Getty Images)
