After weeks of near-constant rain and flooding, California is finally drying out—but hopefully not getting too dry, because the state needs all the rain it can get to pull itself out of a historic drought. This is California at its most frenetic and contradictory: Climate change is making both dry spells and rainstorms more intense, ping-ponging the state’s water systems between critical shortages and canal-topping deluges.
A simultaneous solution to both extremes is right beneath Californians’ feet: aquifers, which are made up of underground layers of porous rock or sediments, like gravel and sand, that fill with rainwater soaking through the soil above. This water can come
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