2D Zone Data Fields (SWMM)
2D Zone data can be edited on either the 2D Zone Grid Window of the Polygons Grid or the 2D 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 2D Zone data, use the Property Sheet.
The following describes all the data which can be used to define a 2D Zone. For details of results fields, see the 2D Zone Results Data Fields topic.
2D Zone Data
Database Table Name: sw_2d_zone
Field Name |
Help Text |
Database Field |
Size |
Precision |
Default |
Error Lower Limit |
Error Upper Limit |
Warning Lower Limit |
Warning Upper Limit |
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ID |
The name of the zone. |
zone_id |
Text |
64 |
|
0 |
|
|
|
|
|
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Area |
Zone area. Default value calculated from polygon geometry. |
area |
Double |
|
CA |
3 |
|
|
|
|
|
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Maximum triangle area |
A measure of mesh resolution used when creating a 2D mesh. Maximum allowable triangle area for areas in the 2D Zone that are not in a mesh zone. |
max_triangle_area |
Double |
|
NA |
3 |
100.0 m2 |
0.001 |
|
|
|
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Minimum element area |
Minimum mesh element area used for calculating results. Mesh elements with area less than the minimum area specified, will be aggregated with adjoining 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 |
25 |
0.001 |
|
|
|
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Boundary type |
Boundary condition for the 2D Zone. (In any boundary case where water is allowed to flow out of the 2D Zone, the water volume that has flowed out of the 2D Zone is recorded in the log file to check mass conservation.) Note that a Porous Wall, Porous Polygon or 2D Boundary collinear with the boundary of the 2D Zone, will override the boundary condition of the 2D Zone along the coincident portion of the boundary. In the case of a porous wall or porous polygon, the coincident portions of the wall/polygon are considered infinitely high, regardless of any crest level specified.
|
boundary_type |
Text |
80 |
|
0 |
Vertical Wall |
|
|
|
|
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Terrain-sensitive meshing |
Check this option to apply terrain-sensitive meshing during the mesh generation process. The Maximum height variation field must be specified. See Terrain-sensitive meshing for more details. |
terrain_sensitive_mesh | Boolean | ||||||||||||||||||||||||||
Maximum height variation |
Enabled when Terrain-sensitive meshing is checked. The maximum height variation that is permitted within a single triangle. Triangles with a height variation greater than this will be split provided this would not result in a triangle smaller than the Minimum element area. |
max_height_variation | Double | L | 3 | 1.0 | 0.001 | ||||||||||||||||||||||
Minimum angle |
Minimum allowable angle between triangle vertices when creating a 2D mesh. |
minimum_angle |
Double |
|
ANGLE |
2 |
25.0 |
0.01 |
35 |
|
|
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Roughness (Manning's n) |
Manning roughness (n), used when creating a 2D mesh. |
roughness |
Double |
|
|
4 |
0.0125 |
0 |
|
|
|
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Roughness definition |
The name of the Roughness definition associated with the 2D Zone. Any Roughness definitions already specified can be selected from the dropdown list. Alternatively, a new one can be added or an existing one modified using the button located to the left of the field. This displays the non-visual object menu, from which you can select the appropriate option. |
roughness_definition_id | Text | 64 |
|
|
|
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Apply rainfall etc directly to mesh elements |
A check box that determines whether or not rainfall profiles and their corresponding evaporation profiles are applied to 2D mesh elements in the zone. If checked, the profiles will be applied. See 2D meshes for further details. 2D Meshes and Subcatchment Overlap
If 2D meshes and subcatchments overlap, rainfall will be applied to both subcatchment and 2D mesh independently by default. To prevent applying rainfall twice in subcatchment areas, set the Apply rainfall etc field to outside subcatchments. |
apply_rainfall_directly |
Boolean |
|
|
0 |
0 |
|
|
|
|
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Apply rainfall etc |
Enabled when Apply rainfall etc directly to mesh elements is selected. Used to define whether application of rainfall and evaporation will be applied to the entire mesh, or outside of subcatchments only.
|
apply_rainfall_subcatch |
Text |
80 |
|
0 |
everywhere |
|
|
|
|
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Rainfall profile |
The name of the rainfall profile applied to the mesh elements in this polygon. Each profile within a Rainfall Event has a unique name. You must set a value in this field, or set the field flag to #D to use the User Defined Default. If the field does not contain a valid rainfall profile ID, the following action is taken when you run a simulation:
When using a Rainfall Event containing rain gage boundary data, the Rainfall Profile is over-ridden and depends on which rain gage boundary contains the mesh elements. See Spatially Varying Rainfall in SWMM Networks. |
rainfall_profile |
Text |
64 |
|
0 |
|
|
|
|
|
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Rainfall percentage |
Percentage indicating how much of the rainfall depth will fall directly onto the ground within the 2D zone. Used to avoid double counting, e.g. of rainfall falling onto building roofs and flowing directly into the drainage system. |
rainfall_percentage | Double | 3 | 0 | 100 | |||||||||||||||||||||||
Mesh summary |
Read-only field containing meshing summary data (e.g. ground model, data source for voids, number of triangles etc.), and a list of mesh warnings. Only the latest meshing information is stored in this field. Previous meshing summary information will be overwritten if re-meshing of the zone takes place and the mesh results are loaded. See Creating 2D meshes. |
mesh_summary |
Memo |
|
|
0 |
|
|
|
|
|
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Mesh data |
Mesh element properties and simulation results (if loaded), can be displayed using this field. Click to display the Select element dialog. Enter the mesh element ID and click OK to display data for the mesh element in the 2D Zone Mesh Element Properties dialog. |
mesh_data | Array | 0 |