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.

Icon Key Unit Range Description Default value
Waterwizard icon weir height.png 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
Waterwizard icon weir width.png WEIR_WIDTH m 0 to 10000 The width of the weir. 5
Waterwizard icon weir angle.png WEIR_ANGLE geo angle (0-360°) -1.7976931348623157E308 to 1.7976931348623157E308 The top down orientation angle of the weir. 0
Waterwizard icon weir coefficient.png WEIR_COEFFICIENT coefficient 0 to 10000 The flow coefficient related to the shape of the weir. 1,1
Waterwizard icon weir drop threshold.png 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 read in as a point. The Tygron Platform will precompute how the weir should be modeled as a line.

How-to's

See also

Water Module
Benchmarks button.png
Introduction button.png
Water Module
Benchmarks button.png
Getting started button.png
Tutorials
Benchmarks button.png
Overview button.png
Overview
Benchmarks button.png
Theory button.png
Theory
Benchmarks button.png
Benchmarks button.png
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 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
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