• Source: Flood arch

A flood arch is a small supplemental arch bridge provided alongside a main bridge. It provides extra capacity for floodwater.
The space beneath a flood arch is normally dry and often carries a towpath or similar. In some cases it borders on the shallow edge of a river, but this does not carry substantial flow in normal conditions. A bridge with multiple arches across a flowing river would instead be termed a viaduct.
For some bridges, flood arches were added after the first bridge had been constructed, often after initial flooding.




References

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