Porous Wall Data Fields (SWMM)
Porous Wall data can be edited on either the Porous Wall Grid Window of the Lines Grid or the Porous Wall 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 wall data, use the Property Sheet.
The following describes all the data which can be used to define a Porous Wall.
Fields that are common to the majority of objects can be found in the Common Fields topic.
Porous Wall Data
Database Table Name: sw_porous_wall
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 Wall |
ID of the line. |
line_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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Length |
Length of the Line. |
length |
Single |
|
L |
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 wall 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 wall 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 ρgH2 Where: 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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General Line XY Data |
This field defines the coordinate of the line vertices. The underlying data consists of a series of (x,y) pairs. Each line is made up of a series of straight lines between the defined (x,y) pairs. This data is not displayed on the grid or property sheet. Coordinates of line vertices are included when you export line data to CSV files. There are two options available for exporting line coordinates. These are selected on the Select CSV Export Options Dialog using the Coordinate Arrays Format dropdown list. The options are:
|
general_line_xy |
Array |
|
XY |
3 |
|
|
|
|
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