Floodway (road)

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A floodway on a gravel road West Toodyay River Rd floodway 2.jpg
A floodway on a gravel road

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]

Contents

They are designed to be submerged under water, but withstand such conditions. Typically floodways are used when the flood frequency or time span is minimal, traffic volumes are low, and the cost of a bridge is uneconomic [2] [3] – in most cases, in rural areas.


Floodway on Great Northern Highway, Western Australia Great Northern Highway near Payne's Find (wide).jpg
Floodway on Great Northern Highway, Western Australia
Floodway and signs, eastern side of Southern Cross, Western Australia Southern Cross floodway.JPG
Floodway and signs, eastern side of Southern Cross, Western Australia
Floodway (road goes across the photo) in Baja California, Mexico. Note bridge behind it. Floodway in Ensenada BC Mexico.jpg
Floodway (road goes across the photo) in Baja California, Mexico. Note bridge behind it.

See also

Notes

  1. 1 2 MRWA Waterways Section; BG&E Pty Ltd (24 April 2006). "Floodway Design Guide" (PDF). Main Roads Western Australia. p. 4. Archived from the original (PDF) on 15 April 2015. Retrieved 15 April 2015.Additional archives: 15 April 2015 .
  2. Austroads; Flavell, David; Audora, Henry (1994), Waterway design : a guide to the hydraulic design of bridges, culverts and floodways, Austroads, ISBN   978-0-85588-440-6


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