Object datum output a (Water Overlay)

Icon	Key	Unit	Range	Description	Default value
	OBJECT_DATUM_OUTPUT	m + datum		An array of values, two per timeframe. Each value indicates the water level at one sides of the hydraulic structures, entry or exit.	None

All hydraulic structures have an OBJECT_DATUM_OUTPUT attribute.

A weir showing the datum heights at that timeframe, obtained from the values of the OBJECT_DATUM_OUTPUT key stored in that weir.

Notes

• This attribute does not need to be created when configuring the project. This attribute is created automatically by the Water Overlay when a calculation is performed. When the calculation is complete, the attribute is updated automatically.
• Each Water Overlay will create this attribute with the ID of an Overlay appended to it, to prevent the results of multiple Water Overlays storing their results in the same attribute by default.
• This attribute is also visible when zoomed in on a hydraulic structure. The water levels on either side of the structure can be seen at each timeframe when a Water Overlay is selected.

See also

• Hydraulic structures
• Water level
• Object flow output

---

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