What exactly is a 500-year flood?
Mother's Day flooding was the second 500-year flood in less than 12 months in the St. Louis region.
Source: ksdk.com
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South County residents without insurance, MSD help after floods
"What happened in Indian Hills was a 500-year flood," Stone added. He says historic flooding is occurring more frequently, a probable result of climate change.
Source: ksdk.com