Weir angle (Water Overlay)

Icon	Key	Unit	Range	Description	Default value
	WEIR_ANGLE	geo angle (0-360°)		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. A note about this option is necessary: The weirs are automatically well oriented, but the waterways are not blocked, which means that water can flow past the weirs. That is why we recommend using a dataset in which the attribute is already present, because then 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.

.

See also

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

---

Water Module

Water Module

Tutorials

Overview

Theory

Benchmarks

Group

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 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 width output

Related

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