Terrain water manning (Water Overlay)

The default value for the WATER_MANNING attribute of surface type "Open land". The user can change this value.

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 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)

API Endpoints

• Api session event editor terraintype set attribute

References

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Water Module

Water Module

Tutorials

Overview

Theory

Benchmarks

Group

Terrain attributes

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