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 building is present with overwriting values.
|WATER||boolean||Surface||Whether the specified terrain is a water terrain.|
|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.|
|WATER_EVAPORATION_FACTOR||factor||Surface||How fast this terrain can evaporate water from the underground. The weather's evaporation speed is multiplied by this factor to determine the rate of evaporation.|
|HYDRAULIC_CONDUCTIVITY_MD||m/day||Underground||The hydraulic conductivity (symbolically represented as K) is defined as the speed by which water moves through the saturated underground horizontally.|
|WATER_STORAGE_PERCENTAGE||fraction (m3/m3)||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 surface to the underground unsaturated zone.|
|WATER_MANNING||s/(m1/3)||Surface||The Gauckler–Manning coefficient of the terrain|
- 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.