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 model land tunnels, allowing water to flow through while traversing 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). Each end-point of a culvert will be put on the threshold height or the terrain height at that end-point, whichever value is the highest.	-10000
	CULVERT_N	manning value	0 to 3.4028235E38	The manning friction value of the culvert's material, which influences the flow speed.	0,014

Notes

• A default Culvert Function exists with the following properties:
  • ID: 938
  • Placement Type: HYBRID
  • Category: UNDERGROUND
  • Attributes:
    • CULVERT_DIAMETER : 1.0;
    • CULVERT_N : 0.014;

The attributes of the default culvert can be changed using the Function Values Table

• 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. Ensure the waterway is obstructed by increasing the terrain height, forcing water to flow exclusively through the culvert.

How-to's

• How to correct multiple buildings on the same location
• How to correct weir or 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)

API Endpoints

• Api session event editor overlay set key value
• Api session event editor building set attribute
• Api session event editor functionoverride set attribute

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Watershed Module

Watershed Module

Tutorials

Overview

Theory

Benchmarks

Group

Model attributes

Structures

Discharge area • Culvert

Overlay

Fill distance • Discharge remaining water • Culvert flow direction • Min area • Limit road

Related

Result type • Model attributes