Transect Data Fields (SWMM)
Information relating to a transect can be viewed
and edited on the Transect Grid Window of the Links Grid or on the Transect 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 transect data, use the Property Sheet.
The table below describes all the data which can be used to define a transect.
Common Data Fields
Fields that are common to the majority of objects can be found in the Common Fields topic.
Transect Data
Database Table Name: sw_transect
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Field Name
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Help Text
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Database Field
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Data Type
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Size
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Units
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Precision
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Default
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Error Lower Limit
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Error Upper Limit
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Warning Lower Limit
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Warning Upper Limit
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| Transect ID |
The unique name used to identify this transect.
|
id |
Text |
254 |
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| Left bank roughness |
The Manning's roughness value for the left bank of the transect. |
left_roughness |
Double |
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3 |
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| Right bank roughness |
The Manning's roughness value for the right bank of the transect.
|
right_roughness |
Double |
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3 |
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| Channel roughness |
The Manning's roughness value for channel part of the transect. |
channel_roughness |
Double |
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3 |
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| Left bank offset |
A value that denotes the offset at the end of the left bank. |
left_offset |
Double |
|
L |
3 |
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| Right bank offset |
A value that denotes the offset at the start of the right bank. |
right_offset |
Double |
|
L |
3 |
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| Stations factor |
The factor by which the distance between each station will be multiplied when the transect data is processed during a simulation. A value of 0 indicates that no factor is required.
The stations are entered using the transect Profile grid.
|
width_factor |
Double |
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3 |
0 |
0 |
|
0 |
|
| Elevation modifier |
A constant value that is added to each elevation.
The elevations are entered using the transect Profile grid.
|
elevation_adjust |
Double |
|
Y |
3 |
0 |
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| Meander factor |
A ratio of the length of a meandering main channel to the length of the bank offset area that surrounds it. This factor is applied to all conduits that use this particular transect for their cross section, and assumes that the length supplied for these conduits is that of the longer main channel.
The SWMM engine will use the shorter bank offset length in its calculations while increasing the main channel roughness to account for its longer length.
The meander factor is ignored if it is left blank or set to 0.
A value greater than 1.0 will decrease overall flow in the channel while a value smaller than 1.0 will increase overall flow in it.
|
meander_factor |
Double |
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|
3 |
0 |
0 |
|
0 |
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| Profile |
A series of records which define the cross section channel profile for this transect. The records are specified on a grid which is displayed by clicking on the  button.
Database Table Name: sw_trans_profile
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Field Name
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Help Text
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Database Field
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Data Type
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Size
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Units
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Precision
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Default
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Error Lower Limit
|
Error Upper Limit
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Warning Lower Limit
|
Warning Upper Limit
|
| Station |
The distance from the left side of the channel when looking downstream.
Values must be specified in ascending order.
The minimum number of stations that can be specified is 2 and the maximum number is 1500.
|
x |
Double |
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L |
3 |
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| Elevation |
The corresponding elevation of the channel bottom. |
z |
Double |
|
Z |
3 |
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| Profile |
A read-only graph of the values entered in the Station and Elevation fields. |
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