The cumulative rainfall recorded during the early February storms was eye-popping. For the five-day period that ended at 5 a.m. Feb. 8, downtown Los Angeles got more than 9 inches. That's more than 60% of its average annual rainfall.
Most of those slides that we've seen - that have been in the news - have been in the built environment," said Matt Thomas, a research hydrologist with the USGS' landslide hazards program.
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