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A low-water crossing (also known as an Irish bridge or Irish Crossing, causeway in Australia, low-level crossing or low-water bridge) is a low-elevation roadway traversing over a waterbody that stays dry above the water when the flow is low, but is designed to get submerged under high-flow conditions such as floods.
Fords may be impassable during high water. A low-water crossing is a low bridge that allows crossing over a river or stream when water is low but may be treated as a ford when the river is high and water covers the crossing. The word ford is both a noun (describing the water crossing itself) and a verb (describing the act of crossing a ford).
A floodway is a flood plain crossing for a road, built at or close to the natural ground level. [1] It is similar to a causeway, but crosses a shallow depression that is subject to flooding, rather than a waterway or tidal water. [2] They are designed to be submerged under water, but withstand such conditions.
Low water crossing, a non-moving bridge that is sometimes submerged; Moveable bridges for a list of other moveable bridge types; Table bridge, a similar bridge that moves upward; Underwater bridge, a non-moving military bridge that is always submerged
Diversion occurs when a road slopes downward from a crossing and the height of the road exceeds the height of any outlet down the road. A sag (dip) in the road below the crossing may serve as a channel for over flow of excess water and prevent water from continuing down the road but is only practical on gentle slopes. [1]
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