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Flood Risk Perception Survey, risk education and outreach

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Under the US National Flood Insurance Program, lands behind levees certified to protect against the 100‐year flood are considered outside of the officially‐recognized “floodplain.” However, such lands are still vulnerable to flooding that exceeds the design capacity of the levees—known as residual risk. In the Sacramento‐San Joaquin Delta of California,  lands below sea level are considered not “floodplain” and are open to residential and commercial development because they are “protected” by levees. Residents are not informed that they are at risk because officially they are not in the floodplain. We surveyed residents of a recently constructed subdivision in Stockton, California to assess their awareness of their risk of flooding.

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