A culvert is a flowing body of water which passes underneath a road, railway, or embankment, or the part thereof that does so.
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A culvert is a structure used to enclose a flowing body of water.
When used to transport water in streams or rivers, the capacity of the culvert(s) is generally lower than the capacity of the river itself.
When this occurs on a regular basis, the culverts may be replaced with a different type of structure, such as a bridge, that presents less obstruction to the flow of water.
Culverts should be sufficiently sized and installed such that scouring of the outlet streambed does not occur as a result of increased water velocities in the culvert.
Excessive culvert slope, reduced culvert capacity due to countersinking and maintenance of the 200 mm minimum depth of flow, and back watering due to the creation of an outlet pool should be considered when selecting the required culvert diameter to allow fish passage and pass peak flows.
For stacked/multiple culverts, pools should be installed with the fish passage culvert oriented to the center of the pool to allow for a smooth transition of water from the culvert to the watercourse.
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