Mesh Zone Data Fields (InfoWorks)

Mesh zone objects are used as part of the mesh generation process carried out when undertaking 2D Modelling. They can be used to divide a 2D zone into regions of different mesh resolution or to define zones in which ground level modification is required.

Note: To view all data relating to this object, use the Object Properties Window. These data fields are read-only in ICMLive Operator Client. Network objects are configured in InfoWorks ICM Ultimate and ICMLive Configuration Manager. Please refer to the InfoWorks ICM help for more details.

The following describes all the data which can be used to define a mesh zone.

Fields that are common to the majority of objects can be found in the Common Fields topic.

Mesh Zone Data

Database Table Name: hw_mesh_zone

Field Name	Decription	Database Field	Data Type	Size	Units	Precision	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
ID	The name of the mesh zone.	polygon_id	Text	64		0
Area	Mesh zone area. Default value calculated from polygon geometry.	area	Double		CA	3
Maximum triangle area	A measure of the mesh resolution within the zone. Maximum allowable triangle area when creating a 2D mesh. If a value is not specified in this field, the maximum triangle area of the 2D zone containing the mesh zone will be used. If using the clip meshing method for mesh generation, and the specified Maximum triangle area is greater than the 2D zone's Maximum triangle area, the value from the 2D zone is used for mesh generation.	max_triangle_area	Double		NA	3		0.001
Override 2D zone minimum element area setting	If checked, the software uses the Minimum element area specified for the mesh zone for the mesh elements contained within the mesh element boundary. If unchecked, the Minimum element area specified for the 2D zone containing the mesh zone will be used.	apply_min_elt_size	Boolean			0	0
Minimum element area	Minimum mesh element area used for calculating results. Used if the Override 2D zone minimum element area setting option is selected. Mesh zone elements with area less than the minimum area specified, will be aggregated with adjoining mesh zone elements, until the minimum area is met. This is done for the purpose of calculating results in order to improve simulation stability and run time.	min_mesh_element_area	Double		NA	3		0
Ground level modification	Ground level adjustment method to be applied to mesh elements inside mesh zone. Database Value Description Help Text None None No adjustment to ground level Raise or lower Raise or lower Adjust ground level by value specified in Raise by field Level Level Set ground level to value specified in the Level field Upper Limit Upper limit Set maximum ground level to value specified in the Level field Lower Limit Lower limit Set minimum ground level to value specified in the Level field	ground_level_mod	Text	80		0	None	0	0	0	0
Raise by	Enabled when Ground level modification is set to Raise. Change in elevation to be applied to ground level of elements within mesh zone. Specify a negative number to lower the ground level of elements.	raise_by	Double		Y	3	0.0
Level	Enabled when Ground level modification is set to Level, Upper limit or Lower limit. Ground elevation value to be applied to elements within mesh zone. See Ground level modification for details.	level	Double		Z	3	0.0
Override 2D zone Subgrid Sampling	Determines if the Subgrid Sampling values specified in the Subgrid Sampling and Subgrid Sampling triangle area for the mesh zone are used or if they are overwritten with Subgrid Sampling values in the 2D zone that contains the mesh zone. If checked, the software uses the subgrid values specified for the mesh zone. If unchecked (default), the software uses the subgrid values specified for the 2D zone.	subgrid_override
Subgrid Sampling	Enabled if Override 2D zone Subgrid Sampling is checked. If checked, Subgrid Sampling is applied to the 2D mesh zone during mesh generation. If disabled, the 2D zone Subgrid Sampling settings will apply to the Mesh zone. Note: Subgrid Sampling (Tech preview) is only available using Clip meshing method of Mesh generation. See Subgrid Sampling Methodology for details.	subgrid_sampling	Boolean
Subgrid Sampling triangle area	Enabled if Subgrid Sampling is checked and provides a measure of mesh resolution for Subgrid Sampling when creating a 2D mesh. The maximum area for subgrid triangles in a 2D element. This parameter also determines the first entry in the volume/level tables. ICM aggregates the triangle areas of the first triangles in the volume/level tables until the specified maximum area is reached, which becomes the first entry in the volume level table.	subgrid_triangle_area	Double		NA	3	10	0.001