New research shows that California’s Central Valley, known as America’s breadbasket, gets as much as half of its groundwater from the Sierra Nevadas. This is significant for a farming region that, in some parts, relies almost entirely on groundwater for irrigation.
While it is easy to see above-ground reservoirs rise and fall with the rain and snow, aquifers are a natural water source hidden out of sight, in some cases hundreds of feet underground. “They are like giant bathtubs full of water and sediment,” said UC Riverside associate professor of groundwater hydrology Hoori Ajami.