Physical Alternative for Channels

The physical alternative editor for channels is used to create various data sets for the physical characteristics of channels. 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.
Scaled Length	Displays the scaled (as opposed to user defined) length of each channel in the alternative. This is a calculated field for channels that do not have a user-defined length.
Set Invert to Start Node	Lets you automatically set the upstream channel invert to the elevation of the upstream node.
Invert (Start)	Lets you define the upstream channel invert.
Set Invert to Stop Node	Lets you automatically set the downstream channel invert to the elevation of the downstream node.
Start Control Structure	Lets you design a start control structure, or choose a preexisting one. Click the Ellipsis (…) button to open the Channel Control Structure dialog box to set up the control structure you want to use.
Has Stop Control Structure	Lets you define whether or not the currently highlighted element has a stop control structure, and if so, which type. The value chosen here affects the availability of the other fields. If this is set to True, an icon displays at the start/stop-end of the conduit to display the presence of the structure.
Stop Control Structure	Lets you design a stop control structure, or choose a preexisting one. Click the Ellipsis (…) button to open the Channel Control Structure dialog box to set up the control structure you want to use
Has Start Control Structure	Lets you design a stop control structure, or choose a preexisting one. Click the Ellipsis (…) button to open the Channel Control Structure dialog box to set up the control structure you want to use.
Flap Gate?	Lets you choose whether or not the highlighted element has a flap gate. If this is set to True , and icon displays at the stop-end of the conduit to display the presence of the structure. If this is set to True and you design control structures without flap gates selected, the flap gate check box will be enabled for your control structures and a message displayed.
Invert (Stop)	Lets you define the downstream channel invert.
Length (User Defined)	Lets you define the length of each channel in the alternative that has a user-defined length.
Has User Defined Length	Lets you specify whether the channel has a user-defined or schematic length.
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.