Weir (Water Overlay): Difference between revisions

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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.
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 {{inlink|lcase=1|Line-based constructions}}.
[[File:waterwizard_icon_weir.png]] A weir is a [[Line-based_building_(Water_Overlay)|line-based building]].
{{overlay attribute
 
|attribute=[[Weir_height_(Water_Overlay)|WEIR_HEIGHT]]
{{Overlay keys|suppresscategory=true|
|unit={{mdatum}}
{{:weir height (Water Overlay)}}
|description=The height of the weir.
{{:weir width (Water Overlay)}}
|defaultvalue=n/a
{{:weir angle (Water Overlay)}}
|icon=[[File:waterwizard_icon_weir_height.png]]
{{:weir coefficient (Water Overlay)}}
|attribute2=[[Weir_width_(Water_Overlay)|WEIR_WIDTH]]
{{:weir target level (Water Overlay)}}
|unit2=m
|description2=The width of the weir.
|defaultvalue2=5
|icon2=[[File:waterwizard_icon_weir_width.png]]
|attribute3=[[Weir_coefficient_(Water_Overlay)|WEIR_COEFFICIENT]]
|unit3=coefficient
|description3=The flow coefficient related to the shape of the weir.
|defaultvalue3=1,1
|icon3=[[File:waterwizard_icon_weir_coefficient.png]]
}}
}}
{{article end
|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_(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.
* Weirs can be read in as a point. The {{software}} will precompute how the weir should be modeled as a line.
|howtos=
* [[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]]
|seealso=
* [[Weir formula (Water Overlay)]]
* [[Weir height test case (Water Module)]]
}}
{{WaterOverlay hydraulic structure nav}}

Latest revision as of 09:30, 17 January 2023

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.

Waterwizard icon weir.png A weir is a line-based building.

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 read in as a point. The Tygron Platform will precompute how the weir should be modeled as a line.

How-to's

See also