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As the mayor of california's largest city told me, examining water usage will help offset the crisis. >> we've added in the last 45 years a million residents without having to consume a single drop of water more. so it's changing -- it's true. we have 3 million to 4 million more people in last 45 years and we consume the same amount of water as back then because so much water is wasted. >> reporter: some are looking at the very industry that uses up so much of the state's dwindling resource. >> half of california's farms still use the antiquated flood and furrow techniques where you literally ...

California water dating back to over a century ago are also facing restrictions for the first time since 1977. as the mayor of california's largest city told me, examining water usage will help offset the crisis. >> we've added in the last 45 years a million residents without having to consume a single drop of water more. so it's changing -- it's true. we have 3 million to 4 million more people in last 45 years and we consume the same amount of water as back then because so much water is wasted. >> reporter: some are looking at the very industry that uses up so much of the state's dwindling re...

Thing? >> not the way we're currently operating. half of california's farms, and i know last night you showed that drip irrigation and that's important. half of california farms still use the old ant quatd flood and furrow techniques where you lift it up and let the water flow through and flood your farm. >> is that true? >>s it's true. half. there is about 20% that haven't even filled out the forms the state required in 2009. they were supposed to fill out water management plans and splanl how they would conserve water. they don't price water on a volume basis. so you get as many money based ...