Physical Alternative for Cross Section Nodes

The physical alternative editor for cross section nodes is used to create various data sets for the physical characteristics of cross section nodes. The following columns are available:

Column	Description
ID	Displays the unique identifier for each element in the alternative.
Label	Displays the label for each element in the alternative.
Manning’s n	Lets you define the Manning’s roughness value for all of the cross sections in the alternative. This column is available only when the Single Manning’s n Roughness Type is specified.
Channel Manning’s n	Lets you specify the Manning’s roughness value for each cross section node in the alternative. This column is only available for cross section nodes that have a Trapezoidal Channel or Overbank Channel Section Type.
Right Overbank Manning’s n	Lets you specify the Manning’s roughness value for the right overbank of each cross section node in the alternative. This column is only available for cross section nodes that have a Trapezoidal Channel or Irregular Channel Section Type.
Left Overbank Manning’s n	Lets you specify the Manning’s roughness value for the left overbank of each cross section node in the alternative. This column is only available for cross section nodes that have a Trapezoidal Channel or Irregular Channel Section Type.
Roughness Type	Lets you specify the roughness type of each cross section in the alternative.
Transition Length	Lets you define the transition length when the Abrupt Transition Type is chosen.
Transition Type	Lets you specify the transition type of the currently highlighted element. If Abrupt is chosen here, the Transition Length field becomes available for input.
Elevations Modifier	The Elevations modifier is a constant value that will be added to each elevation value. This attribute is only used during SWMM calculations.
Stations Modifier	The Stations modifier is a factor by which the distance between each station will be multiplied when the transect data is processed by SWMM. Use a value of 0 if no such factor is needed. This attribute is only used during SWMM calculations.
Right Bank Station	The distance values appearing in the Station/Elevation grid that mark the end of the left overbank and the start of the right overbank. Use 0 to denote the absence of an overbank.
Left Bank Station	The distance values appearing in the Station/Elevation grid that mark the end of the left overbank and the start of the right overbank. Use 0 to denote the absence of an overbank.
Material	The name of the material used. Alternatively, clicking the Ellipsis (…) button opens the Material Engineering Library, allowing you to select a pre-defined material. If a pre-defined material is chosen, the roughness value will change accordingly.
Manning’s n Flow Curve	Clicking the Ellipsis (…) button in this field opens the Manning’s n Flow Curve editor, allowing you to define the Manning’s roughness vs. flow curve for each element in the alternative that uses the Manning’s n Flow Curve Roughness Type.
Manning’s n Depth Curve	Clicking the Ellipsis (…) button in this field opens the Manning’s n Depth Curve editor, allowing you to define the Manning’s roughness vs. depth curve for each element in the alternative that uses the Manning’s n Flow Curve Roughness Type.
Bottom Width	Displays the bottom width of each element in the alternative. This column is only available for Trapezoidal cross section types.
Elevation (Invert)	Lets you define the invert elevation for all cross section nodes in the alternative. This column is only available for Trapezoidal cross section types.
Slope (Left Side)	Lets you define the left side slope for all cross section nodes in the alternative. This column is only available for Trapezoidal cross section types.
Slope (Right Side)	Lets you define the right side slope for all cross section nodes in the alternative. This column is only available for Trapezoidal cross section types.
Height	Lets you define the height, or channel depth for all cross section nodes in the alternative. This column is only available for Trapezoidal cross section types.
Section Type	Lets you specify the cross section type for all cross section nodes in the alternative. The choices include Trapezoidal and Generic cross section types.