Weir angle (Water Overlay)

Weir placed along a waterway. Elevation is raised along the line perpendicular to the weir angle.

Icon	Key	Unit	Range	Description	Default value
	WEIR_ANGLE	geo angle (0-360°)	-1.7976931348623157E308 to 1.7976931348623157E308	The top down orientation angle of the weir.	0

The weir angle is used to convert a weir loaded in as point-based data to a line which is used in the simulation to define from where to where the water should flow across the weir. In the Water Wizard a weir angle is automatically generated. There are currently 4 options on how this is (automatically) generated:

1. The weir is located on the edge of 2 water level areas. The weir is then automatically installed correctly and no message is displayed. Note that while weirs are automatically oriented, the waterways are not blocked, allowing water to flow past them. Therefore, it is recommended to use a dataset where the attribute is already present to ensure the block is in effect.
2. The weir is located in exactly 1 level area. Then the warning appears that the weir has no angle, with the option to fix it.
3. The weir is located in exactly 0 level areas. Then a comment is displayed about the absence of a water level area.
4. The weir angle attribute is pre-added to a dataset and this dataset is imported into the project. No angle needs to be generated automatically.

The weir angle is adjustable in the weir step of a Water Overlay wizard

Notes

• The width of the generated dam is equal to the weir's WEIR_WIDTH, multiplied by the WEIR_DAM_MULTIPLIER of the Water Overlay.
• If a weir angle is available for a weir which is already line-shaped, the weir is first interpreted as a point, and then the direction and elevation are adjusted accordingly. The centre of the weir's polygon is used.
• If no angle is available as an attribute, the angle weir angles are automatically oriented based on the water level areas.
• The weir angle is automatically converted to a range within 0 and 360.

See also

• Weir width (Water Overlay)
• Weir dam multiplier (Water Overlay)

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Water Module

Water Module

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Hydraulic structures

Inlet

Inlet q • Inlet area • Inlet capacity •  Lower threshold •  Upper threshold • Inlet underground

Pump

Pump q •  Lower threshold •  Upper threshold • Pump angle • Pump capacity • Pump area

Culvert

Culvert diameter • Culvert rectangular height • Culvert threshold • Culvert n

Weir

Weir height • Weir width • Weir angle • Weir coefficient • Weir n • Weir target level

Sewer overflow

Sewer overflow • Sewer overflow speed

Drainage

Drainage q • Drainage datum • Drainage active • Drainage overflow threshold

Output

Object flow output • Object height output • Object datum output a • Object datum output b • Object water area output • Object width output • Weir dam output

Related

Building attributes • Hydrological features •  Terrain attributes • Model attributes • Results • Simulation data