Hydrological attributes of terrains (Water Overlay): Difference between revisions
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{{:terrain water storage percentage (Water Overlay)}} | {{:terrain water storage percentage (Water Overlay)}} | ||
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Revision as of 10:07, 24 January 2024
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.
Terrain water microrelief (Water Overlay)Icon | Attribute | Unit | Layer | Range | Description |
---|---|---|---|---|---|
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. | ||
HYDRAULIC_CONDUCTIVITY_WITH_THICKNESS_MD | m2/day | Ground | The hydraulic conductivity (symbolically represented as KD) is defined as the speed by which water moves through the saturated layer horizontally, multiplied with the layer thickness. | ||
GROUND_INFILTRATION_MD | m/day | Surface | 0 to 10 | The speed at which water can flow vertically from the surface to the unsaturated zone. | |
GROUND_INFILTRATION_MD | m/day | Ground | 0 to 10 | The speed at which water can flow vertically from the surface to the unsaturated zone. | |
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 | nominal | Surface | Whether this Terrain Type represents a form of water (and what type). | ||
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. | ||
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. | ||
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. |
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.