Urban areas like Los Angeles have a high risk of floods because abnormal amounts of rain can't drain into the soil on streets, parking lots and concrete surfaces. Streets can overflow with rain, creating rushing creeks that cause damage.
In Los Angeles, 420,585 homes are at risk, with 27 percent of those properties in higher danger. In Riverside, 211,418 are at risk, with 39 percent at higher danger. In San Bernardino, 156,987 are at risk, with 31 percent at higher danger.
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