Mesh Level Zone Data Fields (SWMM)

Mesh Level Zone data can be edited on either the Mesh Level Zone Grid Window of the Polygons Grid or the Mesh Level Zone Property Sheet.

Most data can be edited on the grid, but some fields cannot be displayed in the grid format.

To view and edit all polygon data, use the Property Sheet.

The following describes all the data which can be used to define a Mesh Level Zone.

Common Data Fields

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

Mesh Level Zone Data

Database Table Name: sw_mesh_level_zone

Show Columns

Database Names

Size, Type and Units

Defaults and Error Limits

Field Name

Help Text

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 zone.

polygon_id

Text

64

 

0

 

 

 

 

 
Type

Method for ground level adjustment:

  • Level (Specified fixed level): the level of all Mesh Level Zone elements and vertices will be set to the value specified in the Level field.
  • Rel. to highest (Fixed level relative to highest): the maximum sampled level from the ground model within the Mesh Level Zone is found, and then raised or lowered by a value specified in the Raise by field.
  • Rel to lowest (Fixed level relative to lowest): the minimum sampled level from the ground model within the Mesh Level Zone is found, and then raised or lowered by a value specified in the Raise by field.
  • Raise or lower: the level of every Mesh Level Zone element and vertex is raised or lowered by a value specified in the Raise by field.
  • Specify (Specified boundary elevations): the elevations at Mesh Level Zone vertices will be set to a user defined value, obtained from the ground model or interpolated from other zone vertices as specified in the Vertices grid. The calculated elevations will then be adjusted by the Elevation adjustment specified in the grid.
  • Adjust (Boundary ground model adjusted): the elevations at Mesh Level Zone vertices will be set from the ground model and will then be adjusted by the Elevation adjustment specified in the Vertices grid.
 level_type Text 30   0 Specify        
Use upper limit

Displayed when Type is set to Specify (Specified boundary elevations) or Adjust (Boundary ground model adjusted).

Check this option to impose an Upper limit level on the elevations assigned to Mesh Level Zone vertices.

 use_upper_limit Boolean     0 0        
Upper limit level

Enabled when Use upper limit option is checked.

Elevation at a vertex will be set to the Upper limit level if the calculated adjusted elevation at the vertex is higher than the Upper limit level value.

 upper_limit_level Double   Z 3 0        
Use lower limit

Displayed when Type is set to Specify (Specified boundary elevations) or Adjust (Boundary ground model adjusted).

Check this option to impose a Lower limit level on the elevations assigned to Mesh Level Zone vertices.

 use_lower_limit Boolean     0 0        
Lower limit level

Enabled when Use lower limit option is checked.

Elevation at a vertex will be set to the Lower limit level if the calculated adjusted elevation at the vertex is lower than the Lower limit level value.

 lower_limit_level Double   Z 3 0        

Area

Zone area. Default value calculated from polygon geometry.

area

Double

 

CA

3

 

 

 

 

 
Level

Displayed when Type is set to Level (Specified fixed level).

The level to be applied to all vertices / elements in the Mesh Level Zone.

 level Double   Z 3 0        
Raise by

Displayed when Type is set to Rel. to highest (Fixed level relative to highest, Rel. to lowest (Fixed level relative to lowest) or Raise or lower.

The value by which the level of Mesh Level Zone elements and vertices are raised or lowered. Specify a negative value to lower the level.

 raise_by Double   Y 3 0        
Vertices

Displayed when Type is set to Specify (Specified boundary elevations) or Adjust (Boundary ground model adjusted).

Displays the editor for specifying method of calculating elevation at each vertex of the Mesh Level Zone.

Database Table Name: sw_mesh_lvl_sec

Show Columns

Database Names

Size, Type and Units

Defaults and Error Limits

Position in Data Structure

Field Name

Help Text

Database Field

Data Type

Size

Units

Default

Error Lower Limit

Error Upper Limit

Warning Lower Limit

Warning Upper Limit
1 X coordinate X coordinate of vertex X Double   L          
2 Y coordinate Y coordinate of vertex Y Double   L          
3 Vertex elevation type

Enabled when Type is set to Specify.

Select an option for calculating the elevation of each vertex:

  • Interpolate: the elevation of the vertex is linearly interpolated along the Mesh Level Zone boundary line from the elevation of other vertices. (If all vertices have 'interpolate' set, elevation will be taken from the ground model.)
  • Set: the user specifies the elevation of the vertex in the Elevation column of the grid
  • Ground model: the elevation of the vertex is taken from the ground model
 vertex_elev_type Text 12   Interpolate        
4 Elevation Enabled when Vertex elevation type is defined as Set. elevation Double   Z 0.0        
5 Elevation adjustment

When Type is set to Specify, this is the value by which the elevation obtained from the ground model, obtained by interpolation, or set to a user defined value will be adjusted.

When Type is set to Adjust, this is the value by which the ground model level at the vertex will be adjusted.

 elev_adjust Double   L 0.0        
level_sections Array                

Mesh Level Zones

Polygon Objects

Polygons Grid

Property Sheets