Last Updated
：2025/11/29
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An outfall fitted with a metal flap so that floodwater will not back up
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flapped outfall
After the heavy rains, the town's maintenance crew inspected the flapped outfall to confirm the metal flap had prevented any backflow into the storm drains.
See correct answer
After the heavy rains, the town's maintenance crew inspected the flapped outfall to confirm the metal flap had prevented any backflow into the storm drains.
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