Sinkholes are popping up all over California, thanks to the rain. Here’s what to know

Mercury News - 02-22

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Sinkholes are rare in California, but the heavy rains this winter produced several dangerous ones around the state. A sinkhole is an area of ground that has no natural external surface drainage – when it rains, all the water stays inside the sinkhole and typically drains into the subsurface. There are several types of sinkholes that can vary from a few feet wide to hundreds of acres and from less than 1 to more than 100 feet deep.