Hydrological attributes of terrains (Water Overlay)

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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 building is present with overwriting values.

Icon Attribute Unit Layer Range Description
WATER nominal Surface Whether this Terrain Type represents a form of water (and what type).
Waterwizard icon water root depth m.png ROOT_DEPTH_M m Surface The depth of the roots of the terrain type. This depth is used to determine whether evaporation will occur from the groundwater.
Waterwizard icon evaporation factor.png WATER_EVAPORATION_FACTOR factor Surface How fast this terrain can evaporate water from the ground. The weather's evaporation speed is multiplied by this factor to determine the rate of evaporation.
Waterwizard icon water hydraulic conductivity.png HYDRAULIC_CONDUCTIVITY_MD m/day Ground The hydraulic conductivity (symbolically represented as K) is defined as the speed by which water moves through the saturated zone horizontally.
Waterwizard icon water storage.png WATER_STORAGE_PERCENTAGE fraction (m3/m3) Ground The percentage (as a fraction) of the ground layer volume which can be filled with water. A lower percentage means the ground layer will be able to store less water, and the saturated zone will rise higher with the same amount of water in the ground layer.
Waterwizard icon water infiltration.png GROUND_INFILTRATION_MD m/day Surface 0 to 10 The speed at which water can flow vertically from the surface to the unsaturated zone.
Waterwizard icon water infiltration.png GROUND_INFILTRATION_MD m/day Ground 0 to 10 The speed at which water can flow vertically from the surface to the unsaturated zone.
Waterwizard icon manning.png WATER_MANNING s/(m1/3) Surface The Gauckler–Manning coefficient of the terrain, which is a measure of surface roughness. Used in the surface flow computation of the Water Overlay.

Notes

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