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Almonds are irrigated with 3.5 acre feet or 42 inches of water, and the typical 124 almond trees per acre yield an average 2,270 pounds of nuts. One cubic foot of water is 7.5 gallons, and one acre is 43,560 square feet, so 502 gallons of water are used to produce a pound of almonds: (7.48 x 3.5 x 43,560 )/2,270 = 502. With about 380 almonds per pound, each almond requires about 1.3 gallons of water.

California's acreage of long-staple Pima cotton declined as more farmers switched to almonds. California had over 300,000 acres of Pima cotton in 2011, and fewer than 100,000 acres in 2015. Despite cotton yields of over 1,200 pounds per acre, nuts and processing tomatoes require less water per dollar of revenue.

Over 70 percent of California grapes and almonds are irrigated with drip or a similar low-water technology. However, less than 10 percent of the alfalfa and corn used to feed dairy cows uses water-saving technologies; flood irrigation is typical.

A Fresno State study (www.fresnostate.edu/academics/drought/) focused on the effects of the drought in the eight-county San Joaquin Valley, emphasizing that areas most dependent on surface water suffered most. The report called for water budgeting, that is, recognizing the true value of water and pricing it accordingly.

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