Research published last year, analysing tree rings, showed that California’s Central Valley had not been as dry for 500 years.The level of snow in the Sierra Nevada mountains – which usually supplies 30% of the state’s water – has been decreasing in recent years.
And reservoirs throughout the state are at a record low. In some areas, water tables have dropped by 50 feet as more and more wells are drilled. In 2014, restrictions on the use of groundwater − mainly applying to urban areas − were brought in.
It’s only going to get worse so what should be done about it?