Hydrological attributes of terrains (Water Overlay): Difference between revisions

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[[Terrain]]s 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.
[[Terrain]]s have several hydrological properties that influence water flow within a project. Since surface and underground terrain cover the entire project area, all cells use these properties unless overridden by a [[hydrological attributes of buildings (Water Overlay)|building]].


{| class="wikitable"
{{terrain attributes|suppresscategory=true|allowselflinks=true|
! Icon
{{:terrain hydraulic conductivity md (Water Overlay)}}
! Attribute
{{:terrain hydraulic conductivity with thickness md (Water Overlay)}}
! Unit
{{:terrain ground infiltration md (Water Overlay)}}
! Type
{{:terrain root depth m (Water Overlay)}}
! Description
{{:terrain van genuchten m (Water Overlay)}}
|-
{{:terrain water (Water Overlay)}}
|
{{:terrain water evaporation factor (Water Overlay)}}
|[[Terrain_water_(Water_Overlay)|WATER]]
{{:terrain water manning (Water Overlay)}}
|boolean
{{:terrain water microrelief m (Water Overlay)}}
|Surface
{{:terrain water storage percentage (Water Overlay)}}
|Whether the specified terrain is a water terrain.
}}
|-
 
|
{{article end
|[[Terrain_root_depth_m_(Water_Overlay)|ROOT_DEPTH_M]]
|notes=
|m
* In general, surface [[Terrain Attributes]] can be overridden by [[hydrological attributes of buildings (Water Overlay)|attributes of building]]s on the surface, even when the attribute values of the building are set to 0.
|Surface
|api=
|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.
* [[Api session event editor terraintype set attribute]]
|-
}}
|[[File:waterwizard_icon_evaporation_factor.png]]
|[[Terrain_water_evaporation_factor_(Water_Overlay)|WATER_EVAPORATION_FACTOR]]
|factor
|Surface
|How fast this terrain can evaporate water from the underground. The [[Weather|weather]] evaporation speed is multiplied by this factor to determine the rate of evaporation.
|-
|
|[[Terrain_water_storage_percentage_(Water_Overlay)|WATER_STORAGE_PERCENTAGE]]
|fraction
|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.
|-
|[[File:waterwizard_icon_water_infiltration.png]]
|[[Terrain_ground_infiltration_md_(Water_Overlay)|GROUND_INFILTRATION_MD]]
|m/day
|Surface
|The speed at which water can flow vertically from the surface to the underground unsaturated zone.
|-
|[[File:waterwizard_icon_water_infiltration.png]]
|[[Terrain_ground_infiltration_md_(Water_Overlay)|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.
|-
|[[File:waterwizard_icon_manning.png]]
|[[Terrain_water_manning_(Water_Overlay)|WATER_MANNING]]
|s/(m<sup>1/3</sup>)
|Surface
|The Gauckler–Manning coefficient of the terrain.
|}  


{{WaterOverlay terrain attribute nav}}
{{WaterOverlay terrain attribute nav}}
[[Category:Water Module]]

Latest revision as of 14:03, 15 July 2026

Terrains have several hydrological properties that influence water flow within a project. Since surface and underground terrain cover the entire project area, all cells use these properties unless overridden by a building.

Icon Attribute Unit Layer Range Description
HYDRAULIC_CONDUCTIVITY_MD m/day Ground Hydraulic conductivity (K) is a measure of the ease with which water can move through pore spaces or fractures in a saturated medium.
HYDRAULIC_CONDUCTIVITY_WITH_THICKNESS_MD m2/day Ground This attribute represents the horizontal hydraulic conductivity (KD) of the saturated layer multiplied by the layer thickness.
GROUND_INFILTRATION_MD m/day Surface 0.0 to 10.0 The speed at which water can flow vertically from the surface to the unsaturated zone.
GROUND_INFILTRATION_MD m/day Ground 0.0 to 10.0 The speed at which water can flow vertically from the unsaturated zone to the saturated 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.
VAN_GENUCHTEN_M fraction Ground 0.05 to 1.0 Van Genuchten Soil Parameter M needed to calculate the Soil Water Retention Curve in the Unsaturated Zone.
WATER nominal Surface Whether this Terrain Type represents a form of water (and what type).
WATER_TRANSPIRATION_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 transpiration.
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_MICRORELIEF_M m Surface 0 - 0.255 The defined Microrelief in meters, which captures surface water. When captured, surface flow is halted until the defined threshold is reached. Evaporation and infiltration for water captured in Microrelief is still allowed.
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

API Endpoints

Water Module
Water Module
Tutorials
Overview
Theory
Benchmarks
Group
Terrain attributes
Ground infiltration md •  Hydraulic conductivity md •  Hydraulic conductivity with thickness md •  Root depth m •  Water •  Water transpiration factor •  Water manning •  Water microrlief m •  Water storage percentage •  Van genuchten m
Related
Building attributes • Hydrological features • Hydraulic structures • Model attributes • Prequels • Results • Simulation data
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