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Last edited 01 Dec 2020
Culvert, screen and outfall manual, (CIRIA C786) published by CIRIA in 2019, defines a culvert as: 'A covered channel or pipe which prevents the obstruction of a watercourse or drainage path by an artificial construction.'
It defines an arch culvert a ditch culvert as: ‘A term used in highway drainage to describe where a highway drainage ditch at the edge of a road is crossed by a field access. The flows in the drainage system will often be low, both in volume and velocity, and the channel will also be relatively shallow. The culvert in this location will be short, and have a minimal cover to its soffit.
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