Hydrological attributes of terrains (Water Overlay): Difference between revisions
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{{terrain attributes|suppresscategory=true|allowselflinks=true| | {{terrain attributes|suppresscategory=true|allowselflinks=true| | ||
{{:terrain hydraulic conductivity md (Water Overlay)}} | {{:terrain hydraulic conductivity md (Water Overlay)}} | ||
{{:terrain hydraulic conductivity with thickness md (Water Overlay)}} | |||
{{:terrain ground infiltration md (Water Overlay)}} | {{:terrain ground infiltration md (Water Overlay)}} | ||
{{:terrain root depth m (Water Overlay)}} | {{:terrain root depth m (Water Overlay)}} |
Revision as of 10:06, 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.
Icon | Attribute | Unit | Layer | Range | Description |
---|---|---|---|---|---|
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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. | |
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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. | |
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GROUND_INFILTRATION_MD | m/day | Surface | The speed at which water can flow vertically from the surface to the unsaturated zone. | |
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GROUND_INFILTRATION_MD | m/day | Ground | The speed at which water can flow vertically from the surface to the unsaturated zone. | |
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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). | ||
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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. | |
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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. | |
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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.