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### Straight Channel

Figure 97: Channel geometry

The straight channel is characterized by a trapezoid cross section, the bottom width of which can be defined to vary linearly. This is illustrated in Figure 97. The following constants have to be specified on the line beneath the *FLUID SECTION,TYPE=CHANNEL STRAIGHT card:

- the width
- the slope (if the slope is calculated from the coordinates of the end nodes belonging to the element)
- the length
- the trapezoid angle
- the grain diameter for the White-Colebrook law or the Manning constant for the Manning law (in the latter case the user has to specify the parameter MANNING on the *FLUID SECTION card)
- the number of the upstream reference element

Example files: channel1, chanson1.