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.


  • 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.