Inundation area (Water Overlay) and External area (Water Overlay): Difference between pages

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An inundation area is an initial placement of a quantity of water. This differs from the [[Water level area (Water Overlay)|water level area]]s in that an inundation level allows you to place water anywhere on the surface (but explicitly not on [[terrain water (Water Overlay)|water]]).
{{Overlay attribute
{{Overlay attribute
|attribute=[[Inundation_level_(Water_Overlay)|INUNDATION_LEVEL]]
|attribute=[[External_area_(Water_Overlay)|EXTERNAL_AREA]]
|unit={{mdatum}}
|unit=
|description=The height of the water on non-water surface terrains.
|description=The surface area of the external water body behind the breach. The larger the external water body, the more water can flow from it (or into it), and the smaller the effect of the inflow or outflow of water on the external water level.
|defaultvalue=n/a
|defaultvalue=n/a
|icon=[[File:waterwizard_icon_inundation_level.png]]
|icon=[[File:waterwizard_icon_external_area.png]]
}}
}}
==Notes==
==Notes==
* If a grid cell is not covered by an inundation area or it is marked as [[terrain water (Water Overlay)|water]], the grid cell will not be inundated.
* When a [[Breach_input_area_(Water Overlay)|breach input area]] is defined, an external water body will not be created. Subsequently, the [[External_surface_level_(Water_Overlay)|EXTERNAL_SURFACE_LEVEL]], [[External_water_level_(Water_Overlay)|EXTERNAL_WATER_LEVEL]] and [[External_area_(Water_Overlay)|EXTERNAL_AREA]] attributes will be ignored.
* For terrain with a steep decline, using a single inundation area to define the inundation level might not suffice, since the level is a datum height, not a relative offset from the bottom. Alternatives, such as staggered inundation areas, or initializing the waterway dry, should be considered.
==See also==
==See also==
* [[Water level area (Water Overlay)|Water level area]]
* [[Breach growth formula (Water Overlay)|Breach growth formula]]
* [[Surface model (Water Overlay)|Surface model]]
* [[Breach flow formula (Water Overlay)|Breach flow formula]]
* [[Surface water level formula (Water Overlay)|Surface water level formula]]
* [[Weir formula (Water Overlay)|Weir formula]]
{{WaterOverlay hydrological features nav}}
{{WaterOverlay hydrological features nav}}
{{Water Module buttons}}

Revision as of 14:19, 19 June 2019