Jisho

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Noun
1. bridge designed to be underwater during a flood
Wikipedia definition
2. Low water crossingA low water crossing (also known as an Irish bridge, causeway in Australia, low level crossing or low water bridge) provides a bridge when water flow is low. Under high flow conditions, water runs over the roadway and precludes vehicular traffic. This approach is cheaper than building a bridge to raise the level of the road above the highest flood stage of a river, particularly in developing countries or in semi-arid areas with rare high-volume rain.
Read “Low water crossing” on English Wikipedia
Read “沈下橋” on Japanese Wikipedia
Read “Low water crossing” on DBpedia

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