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Flood arch

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From Wikipedia, the free encyclopedia
Bywell Bridge, two of the river spans with a flood arch beyond. The level of flooding can be seen by the driftwood caught above the cutwater

A flood arch is a small supplemental arch bridge provided alongside a main bridge. It provides extra capacity for floodwater.[1]

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.[2]

Pant-y-Goitre Bridge with both pierced spandrels and a flood arch

References

[edit]
  1. ↑ "Load-carrying capacity of flooded masonry arch bridges, by Author Colin Smith and Matthew Gilbert of The University of Sheffield on Researchgate".
  2. ↑ Crow, Alan (1995). "Bigsweir Bridge". Bridges on the River Wye. Lapridge Publications. pp. 144–145. ISBN 0-9518589-9-8.


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