Root depth m (Water Overlay)

Icon	Attribute	Unit	Range	Description
	ROOT_DEPTH_M	m	0 to 65519	The depth of the roots of this Building, relative to the terrain height at the location of this Building. Water can be drawn from the ground and evaporated if the roots can reach it.

Buildings with a root depth are known as crops and foliage.

Buildings and Terrain types representing grassland, crops and foliage can draw water from the ground, allowing it to evaporate.

Feddes Trapezium

Plants can experience oxygen stress when the groundwater level is too high. The plant roots become saturated so that the plant can no longer transpire. To simulate water stress (including both drought and oxygen stress), the root depth can also be configured with four values instead of one, which will be interpreted using the Feddes transpiration model. In the model, when the groundwater level rises, the transpiration increases. However, at a certain point, the groundwater is too high and the transpiration decreases. Water on the surface can then still evaporate, but the plant cannot transpire anymore.

The sequence for the four values should be defined in order of largest to smallest depth values and is interpreted as a 0-1-1-0 transpiration factor trapezium.

See also

• Root depth m (Water Overlay)
• Root depth m (Terrain Attribute)

API Endpoints

• Api session event editor terraintype set attribute

Notes

• For crops and foliage to evaporate water, both the ROOT_DEPTH_M and the WATER_TRANSPIRATION_FACTOR must be appropriately configured.
• When a building is present in any given location, the values for evaporation in the ground will overrule any values set by terrain in the same location. To model ground evaporation without a building, set the attributes of the building on the applicable terrain type instead.
• When a building has a ROOT_DEPTH_M of 0, the amount of evaporation which takes place in that location is 0.

How-to's

• How to add and remove an Attribute

See also

• Depth of plant roots (Function Value)
• Terrain root depth m (Water Overlay)
• Ground evaporation formula (Water Overlay)
• Groundwater level formula (Water Overlay)
• Ground model (Water Overlay)
• Evapotranspiration model (Water Overlay)

API Endpoints

• Api session event editor building set attribute
• Api session event editor functionoverride set attribute

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Building height • Critical infrastructure • Ground infiltration md • Root depth m • Sewered • Solid • Water transpiration factor • Water manning • Water microrelief m • Tracer A • Tracer B • Tracer C • Tracer D

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