Terrain water manning (Water Overlay): Difference between revisions
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<references> | <references> | ||
{{ref|WikiEngineer | {{ref|WikiEngineer | ||
|name= | |name=HYDRAULIC ROUGHNESS (MANNING'S n) VALUES OF CONDUITS AND CHANNELS | ||
|author= | |author=Oregan State University | ||
|page= | |page= | ||
|source= | |source= | ||
|link= | |link=https://www.oregon.gov/odot/hydraulics/Docs_Hydraulics_Manual/Hydraulics-08-A.pdf | ||
|lastvisit= | |lastvisit=06-03-2026 | ||
}} | }} | ||
</references> | </references> | ||
}} | }} | ||
{{WaterOverlay terrain attribute nav}} | {{WaterOverlay terrain attribute nav}} | ||
Latest revision as of 08:02, 6 March 2026
| 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
- ↑ HYDRAULIC ROUGHNESS (MANNING'S n) VALUES OF CONDUITS AND CHANNELS ∙ Oregan State University ∙ Found at: https://www.oregon.gov/odot/hydraulics/Docs_Hydraulics_Manual/Hydraulics-08-A.pdf ∙ (last visited: 06-03-2026)
- Group
- Terrain attributes