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What is sheetflow (overland flow) flooding?

flooding flow overland
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What is sheetflow (overland flow) flooding?

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Sheetflow flooding occurs when an intense rainfall exceeds storm sewer or roadside ditch capacity. This water can accumulate (see ponding below) in subdivision streets deep enough to flood homes that are not in a floodplain. The water seeks the path of least resistance to a nearby channel by flowing overland. Homes and other structures in this path may be flooded even though they are not shown to be in the floodplain on a Flood Insurance Rate Map.

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