Weir (Water Overlay): Difference between revisions

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{{:weir target level (Water Overlay)}}
{{:weir target level (Water Overlay)}}
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{{article end
{{article end
|notes=
|notes=
[[File:Weir_angle_explain_(Water_Overlay).png|thumb|right|x300px|Weir placed along a waterway. Elevation is raised along the line perpendicular to the [[Weir angle (Water Overlay)|weir angle]].]]
* If a weir is placed in a waterway, and the waterway is not otherwise interrupted, water might be able to flow past the weir via the waterway itself. In order to obstruct the waterway, one of two options can be chosen:
* If a weir is placed in a waterway, and the waterway is not otherwise interrupted, water might be able to flow past the weir via the waterway itself. In order to obstruct the waterway, one of two options can be chosen:
** Define the [[Weir_angle_(Water_Overlay)|weir angle]], in which case the {{software}} will automatically raise the DEM in the simulation based on the position, [[Weir_width_(Water_Overlay)|width]] and angle of the weir.
** Define the [[Weir_angle_(Water_Overlay)|weir angle]], in which case the {{software}} will automatically raise the DEM in the simulation based on the position, [[Weir_width_(Water_Overlay)|width]] and angle of the weir.
** Manually raise  the [[terrain height (Water Overlay)|terrain height]] using the terrain height tool or applying a terrain height GeoTIFF.
** Manually raise  the [[terrain height (Water Overlay)|terrain height]] using the terrain height tool or applying a terrain height GeoTIFF.
* Weirs can be imported as points. The [[Rasterization model]] and [[Water Module]] will always position a weir using its center-point, and orient its flow direction using the optional weir angle. The elevation is [[Weir dam surplus height m (Water Overlay)|raised]] along the line perpendicular to the flow direction, up to the [[Weir dam multiplier (Water Overlay)|extended width]] of weir.
* Weirs can be imported as points. The [[Rasterization model]] and [[Water Module]] will always position a weir using its center-point, and orient its flow direction using the optional weir angle. The elevation is [[Weir dam surplus height m (Water Overlay)|raised]] along the line perpendicular to the flow direction, up to the [[Weir dam multiplier (Water Overlay)|calculated dam width]] of weir.
 
<gallery heights=300px widths=300px>
File:Weir_angle_explain_(Water_Overlay).png|Weir placed along a waterway. Elevation is raised along the line perpendicular to the [[Weir angle (Water Overlay)|weir angle]].
File:valid_dam.png|Perpendicular view of a Weir and the calculated [[Weir dam multiplier (Water Overlay)|calculated dam width]].
</gallery>
|howtos=
|howtos=
* [[How to correct multiple buildings on the same location]]
* [[How to correct multiple buildings on the same location]]

Latest revision as of 12:21, 5 May 2026

Weirs are effectively small dams in the water, and allow water to flow from a water body with a higher water level to a lower water level. Any water exceeding the height of the weir can flow over it, increasing the throughput as the water level increases. Strictly, water can flow over the weir in either direction.

A weir is a line-based building.

Icon Key Unit Range Description Default value
WEIR_HEIGHT m + datum -10000 to 10000 The height of the weir. Water can flow past the weir when the water level exceeds the weir's height. n/a
WEIR_WIDTH m 0 to 10000 The width of the weir. 5
WEIR_ANGLE geo angle (0-360°) -1.7976931348623157E308 to 1.7976931348623157E308 The top down orientation angle of the weir. 0
WEIR_COEFFICIENT coefficient 0 to 10000 The flow coefficient related to the shape of the weir. 1,1
WEIR_N exponent 0 to 3.4028235E38 Weir shape exponent 1.5
WEIR_TARGET_LEVEL m + datum -10000 to 10000 The Weir can be configured to adjust it's height automatically in order to reach the target upstream water level. This parameter is optional. n/a

Notes

  • If a weir is placed in a waterway, and the waterway is not otherwise interrupted, water might be able to flow past the weir via the waterway itself. In order to obstruct the waterway, one of two options can be chosen:
    • Define the weir angle, in which case the Tygron Platform will automatically raise the DEM in the simulation based on the position, width and angle of the weir.
    • Manually raise the terrain height using the terrain height tool or applying a terrain height GeoTIFF.
  • Weirs can be imported as points. The Rasterization model and Water Module will always position a weir using its center-point, and orient its flow direction using the optional weir angle. The elevation is raised along the line perpendicular to the flow direction, up to the calculated dam width of weir.
  • Weir placed along a waterway. Elevation is raised along the line perpendicular to the weir angle.
    Weir placed along a waterway. Elevation is raised along the line perpendicular to the weir angle.
  • Perpendicular view of a Weir and the calculated calculated dam width.
    Perpendicular view of a Weir and the calculated calculated dam width.

How-to's

See also

Water Module
Water Module
Tutorials
Overview
Theory
Benchmarks
Group
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
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