Hydrological attributes of terrains (Water Overlay)

Terrains in a project have a number of hydrological properties which can influence the flow of water in a project. Because there is always both surface and underground terrain defined for the entirety of the project area, all cells are affected by all properties of terrains, unless a construction is present with overwriting values.

Icon	Attribute	Unit	Type	Description
	WATER	boolean	Surface	Whether the specified terrain is a water terrain.
	ROOT_DEPTH_M	m	Surface	The depth of the roots of this surface terrain, relative to the surface. Water can be drawn from the underground and evaporated if the roots can reach it.
	WATER_EVAPORATION_FACTOR	factor	Surface	How fast this terrain can evaporate water from the underground. The weather evaporation speed is multiplied by this factor to determine the rate of evaporation.
	WATER_STORAGE_PERCENTAGE	fraction	Underground	The percentage (as a fraction) of the underground volume which can be filled with water. A lower percentage means the underground will be able to store less water, and the saturated zone will rise higher with the same amount of water in the underground layer.
	GROUND_INFILTRATION_MD	m/day	Surface	The speed at which water can flow vertically from the surface to the underground unsaturated zone.
	GROUND_INFILTRATION_MD	m/day	Underground	The speed at which water can flow vertically from the underground unsaturated zone to the underground saturated zone, and horizontally through across the saturated zone.
	WATER_MANNING	s/(m1/3)	Surface	The Gauckler–Manning coefficient of the terrain.

Notes

• In general, surface terrain attributes can be overridden by attributes of constructions on the surface, even when the attribute values of the construction are set to 0.

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Water Module

Water Module

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Terrain attributes

Terrain attributes

Ground infiltration md •  Hydraulic conductivity md •  Hydraulic conductivity with thickness md •  Root depth m •  Water •  Water evaporation factor •  Water manning •  Water microrlief m •  Water storage percentage

Related

Building attributes • Hydrological features • Hydraulic structures • Model attributes • Results • Simulation data

Water Module

Tutorials

Overview

Theory

Benchmarks