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The discontinuous opening is the downstream element of the boundary element pair defining
a change in channel slope.   The following constants have to be specified on the
line beneath the *FLUID SECTION,TYPE=CHANNEL DISCONTINUOUS OPENING card:
- the width   
- 
 (Figure 109; if (Figure 109; if the slope is calculated from the
  coordinates of the end nodes belonging to the element) the slope is calculated from the
  coordinates of the end nodes belonging to the element)
- the length  (Figure 109; if (Figure 109; if the length is calculated from the
  coordinates of the end nodes belonging to the element) the length is calculated from the
  coordinates of the end nodes belonging to the element)
- the trapezoid angle   
- the grain diameter  for the White-Colebrook law or the Manning
  constant 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) 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 discontinuous slope element.
The length  is typically small compared to the length of the adjacent
channel branches.
 is typically small compared to the length of the adjacent
channel branches.
Example files: channel6.
guido dhondt
2016-07-31