Porous Polygon Data Fields (InfoWorks)
Porous Polygon data can be edited on either the Porous Polygon Grid Window of the Polygons Grid or the Porous Polygon 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 porous polygon data, use the Property Sheet.
The following describes all the data which can be used to define a Porous Polygon.
Fields that are common to the majority of objects can be found in the Common Fields topic.
Porous Polygon Data
Database Table Name: hw_porous_polygon
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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Porous Polygon |
Polygon Identifier |
polygon_id |
Text |
64 |
|
0 |
|
0 |
0 |
0 |
0 |
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Asset ID |
For reference only. Designed as a reference to an asset database, but could be used for anything. |
asset_id |
Text |
64 |
|
0 |
|
|
|
|
|
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Area |
Polygon area. Default value calculated from polygon geometry. |
area |
Single |
|
CA |
3 |
|
|
|
|
|
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Porosity |
Porosity factor between 0 and 1, where 0 represents impermeable and 1 represents fully permeable. |
porosity |
Double |
|
|
3 |
0.0 |
0 |
1 |
|
|
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Crest Level |
Type of wall. Note that a porous polygon collinear with the boundary of a 2D zone, will override the boundary condition of the 2D zone along the coincident portion of the boundary. The coincident portions of the polygon are considered infinitely high, regardless of any crest level specified.
|
crest_level |
Text |
20 |
|
0 |
Infinite |
0 |
0 |
0 |
0 |
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Height |
Enabled if Crest Level of type Height is selected. Height of the top of the wall from ground level. For each segment of wall, this is the height above the highest of the ground levels of the two computational elements either side of the wall. |
height |
Double |
|
Y |
3 |
0.0 |
0 |
|
|
|
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Level |
Enabled if Crest Level of type Level is selected. Height above datum of the top of the wall. |
level |
Double |
|
Z |
3 |
0.0 |
|
|
|
|
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Remove wall during simulation |
Collapse option for wall:
|
remove_wall |
Text |
10 |
|
0 |
Never |
|
|
|
|
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Wall removal trigger |
Variable used to determine when wall is collapsed. This trigger variable relates to the 2D results in the mesh elements adjacent to the wall face.
|
wall_removal_trigger |
Text |
21 |
|
0 |
Depth |
|
|
|
|
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Use difference across wall |
Check this option to determine when the wall collapses by calculating the difference in the Wall removal trigger variable between the two elements on either side of the wall. If this option is not checked, wall collapse will be determined by value of trigger variable in any of the mesh elements adjacent to the wall. |
use_diff_across_wall |
Boolean |
|
|
0 |
0 |
|
|
|
|
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Depth threshold |
Enabled when Wall removal trigger is set to Depth.
|
depth_threshold |
Double |
|
Y |
3 |
0.0 |
|
|
|
|
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Elevation threshold |
Enabled when Wall removal trigger is set to Elevation.
This only applies if at least one of the adjacent elements is wet. |
elevation_threshold |
Double |
|
Z |
3 |
0.0 |
|
|
|
|
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Velocity threshold |
Enabled when Wall removal trigger is set to Velocity.
|
velocity_threshold |
Double |
|
V |
3 |
0.0 |
|
|
|
|
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Unit flow threshold |
Enabled when Wall removal trigger is set to Unit flow.
|
unit_flow_threshold |
Double |
|
UQ |
3 |
0.0 |
|
|
|
|
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Total head threshold |
Enabled when Wall removal trigger is set to Total head.
Corrected total head is calculated by the following equation: V = A x HWhere: H = h + u2/(2g) V(m): Corrected head A: Hydrostatic pressure coefficient H(m): total head h(m): depth u(m/s): normal velocity to the wall g(m/s2): gravity |
total_head_threshold |
Double |
|
Y |
3 |
0.0 |
|
|
|
|
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Force threshold |
Enabled when Wall removal trigger is set to Force per unit length.
Force per unit length is calculated as: F = A x 0.5 x ρgH2Where: F(kN/m): Force per unit length A: Hydrostatic pressure coefficient H(m): total head ρ(Tm/m3): water density g(m/s2): gravity |
force_threshold |
Double |
|
UF |
3 |
0.0 |
|
|
|
|
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Hydrostatic pressure coefficient |
Multiplying factor applied when using Total head or Force per unit length as the Wall removal trigger. |
hydro_press_coeff |
Double |
|
|
3 |
1.0 |
|
|
|
|
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No rainfall |
Used to control whether porous polygon receives any rainfall. If this option is checked, (when polygon represents a building for example), any rain that falls on the porous polygon will be received by the subcatchment and flow directly into the drainage system. Similarly, the porous polygon will not evaporate any water (because the flood water will be inside the building). |
no_rainfall | Boolean | 0 | 0 |