 
 
 
 
 
 
 
  
A reservoir is a downstream boundary condition. The reservoir element represents the part of the channel immediately upstream of the (usually vast) reservoir. Since the backwater curve may change substantially in the neighborhood of the reservoir it is advisable to choose the length of the reservoir element to be small compared to the length of the channel branch it is part of. The following constants have to be specified on the line beneath the *FLUID SECTION,TYPE=CHANNEL RESERVOIR card:
 
 (if
 (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)
 (if
 (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)
 
 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 water depth in the downstream node of a reservoir element must be defined by the user by means of a *BOUNDARY card (degree of freedom 2).
Example files: channel1, chanson1.
 
 
 
 
 
 
