Culvert (Watershed Overlay)

Culverts are effectively tunnels or pipes directly connecting two bodies of water, and allow water to flow in either direction. Culverts can also be used to model tunnels on land, creating a hole which water can flow through when it is flowing over land. The throughput of a culvert is limited by its dimensions.

Culverts are assumed to have a circular cross-section, and level (i.e. not inclined).

A culvert is a line-based building.

Icon	Key	Unit	Range	Description	Default value
	CULVERT_DIAMETER	m	0 to 10000	The inside diameter of the circular-shaped Culvert, or the inside width of a rectangular-shaped Culvert.	1
	CULVERT_RECTANGULAR_HEIGHT	m	0 to 10000	The inside height of a rectangular shaped Culvert.	0
	CULVERT_THRESHOLD	m + datum	-10000 to 10000	The height of the inner side of the culvert's underside (or the threshold height at which water starts flowing through the culvert). When set to a level below the terrain height at either end-point, the culvert's threshold will automatically attain a value equal to that of the highest terrain found at either of its endpoints.	0
	CULVERT_N	manning value		The manning friction value of the culvert's material, which influences the flow speed.	0,014

Notes

• If a culvert is placed in a waterway, and the waterway is not otherwise interrupted, water will be able to flow past the culvert via the waterway itself. It is recommended to make sure that the waterway is obstructed by an increase in the terrain height in such a way that the only way water can flow from the one end of the culvert to the other is via the culvert.

How-to's

• How to correct multiple buildings on the same location
• How to correct weir, pump, or culvert drawn as point
• How to correct a building in an uninterrupted waterway
• How to correct a building at the edge of the project area
• How to correct a culvert connecting two water level areas

See also

• Culvert formula (Water Overlay)

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