article_snippet: 34million acre-feet below normal last year .
article_snippet: The use of groundwater for farming in the Central Valley has caused land to sink by one foot a year.
article_snippet: Sprinklers and other landscaping accounts for 70 per cent of urban water use, according to the Sacramento Bee.
article_snippet: Beyond residents' consumpton, use of groundwater for farming in the Central Valley has caused land to sink by one foot a year.
article_snippet: Above, a water regulator looks at a plant irrigation system .