Terrain water manning (Water Overlay): Difference between revisions
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[[File:Water_manning.png|150px|right|thumb|none|alt=Alt text|The default value for the WATER_MANNING attribute of surface type "Open land". The user can change this value.]] | [[File:Water_manning.png|150px|right|thumb|none|alt=Alt text|The default value for the WATER_MANNING attribute of surface type "Open land". The user can change this value.]] | ||
{{terrain attributes|suppresscategory=true| | {{terrain attributes|suppresscategory=true|<onlyinclude> | ||
{{:water manning (Terrain Attribute)}} | {{:water manning (Terrain Attribute)}}</onlyinclude> | ||
}} | }} | ||
Latest revision as of 15:31, 27 February 2024
| Icon | Attribute | Unit | Layer | Range | Description |
|---|---|---|---|---|---|
 |
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. |
Terrains have an inherent "roughness", affecting the flow of water across their surface, which is expressed by the Gauckler–Manning coefficient or, in short, Manning's value (n).
Notes
- The values for this attribute are clamped between 0.01 and 0.255.
- The manning value can alternatively be provided as a prequel.
- The default values for this attribute are derived from online accessible databases[1] and are readily adjusted by the user.
- If a building is present on the terrain, the WATER_MANNING value of the building is used instead.
- Only terrains of type 'surface' have an assigned WATER_MANNING.
See also
- Surface flow formula (Water Overlay)
- Surface model (Water Overlay)
- Water manning (Water Overlay)
- Manning prequel (Water Overlay)
References
- ↑ WikiEngineer (2008-2011). Manning Roughness Coefficients. Retrieved from: http://wikiengineer.com/Water-Resources/ManningRoughnessCoefficients
- Group
- Terrain attributes