Hydrological attributes of buildings (Water Overlay)

Beyond acting as hydraulic structures, buildings may have additional attributes that influence the hydrologic model. These attributes are stored and used on a grid cell level. This is different from the hydraulic structure attributes, which are stored and used on an object level.

These attributes can be changed individually per Building or per building's function. In most cases, these attributes already exist as a Function Value.

Icon	Attribute	Unit	Range	Description
	FLOOR_HEIGHT_M	m		The height of a floor in a building. Additionally each section of a building can have a different amount of floors.
	CRITICAL_INFRASTRUCTURE	nominal		Whether this building is deemed a critical. 0 means the building is never deemed impacted.
	GROUND_INFILTRATION_MD	m/day		The speed at which water can flow vertically from the surface to the unsaturated zone.
	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.
	SEWERED	boolean		Whether this building is connected to the sewer.
	SOLID	boolean	0 or 1	Whether the building is solid and blocks water flow or not.
	WATER_TRANSPIRATION_FACTOR	factor	0 to 65519	Factor indicating how much a building with a crop, tree or plant function facilitates evapotranspiration. This factor is multiplied with the weather's evaporation rate at a particular time in the simulation.
	WATER_MANNING	s/(m1/3)	0.01 to 0.255	The Gauckler–Manning coefficient of the building.
	WATER_MICRORELIEF_M	m	0 - 0.255	The height and depth of microrelief hills, in which water can be stored.
	WATER_STORAGE	m³/m²		The water storage capacity per square meter for this building.
	TRACER_A	x/m²/s	-3.4028235E38 to 3.4028235E38	The amount of tracer A created per second per m² in this location.
	TRACER_B	x/m²/s	-3.4028235E38 to 3.4028235E38	The amount of tracer B created per second per m² in this location.
	TRACER_C	x/m²/s	-3.4028235E38 to 3.4028235E38	The amount of tracer C created per second per m² in this location.
	TRACER_D	x/m²/s	-3.4028235E38 to 3.4028235E38	The amount of tracer D created per second per m² in this location.

Besides influencing Water Overlay calculations, building attributes—specifically building height—also affect the interpretation of the elevation model.

Notes

• In contrast with hydraulic structures, which can only behave as a single hydraulic object, buildings can have all of the above effects on the hydrological model simultaneously.
• Attributes which are connected to a function value can not be redefined using a different attribute name.

API Endpoints

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

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Building attributes

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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Hydrological features • Hydraulic structures •  Terrain attributes • Model attributes • Prequels • Results • Simulation data