Weir width (Water Overlay)

This figure depicts the original way of implementing weirs (left), and the current way they are implemented in the Tygron Platform (right)

Icon	Key	Unit	Range	Description	Default value
	WEIR_WIDTH	m	0 to 10000	The width of the weir.	5

Notes

Relation between Weir width, Weir height, Weir dam multiplier and elevation adjustments.

• The width of the weir not only affects the amount of water which can flow across the weir, but also the amount of grid cells on either side of the weir which allow water to flow through to the other side. The greater the weir's width, the more cells are considered to be part of the entry- and exitside of the weir.
• The amount of cells which are considered to be part of the entry- and exitside of the weir, are based on the value of the WEIR_WIDTH attribute. If the WEIR_WIDTH attribute is > 25m, the amount of cells has reached a maximum and does not increase anymore.
• The Weir dam multiplier attribute of a Water Overlay controls to what width and height the weir is raised to block the natural flow of water in a waterway.

See also

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

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Water Module

Water Module

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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