A weir is defined as a cross (line) section where the total discharge across the cross section is calculated using empirical formulas and distributed along the cross section. In the numerical calculations the cross section is defined as a section of element faces which is treated as an internal discharge boundary (weak formulation).
Depending on the choice of property page you can see a Geographic View or a List View of the weirs.
There are two different methods for specification of the weir. In the List View you can create a new weir clicking on the "New weir" button. By selecting a weir in the Weir list and clicking on the "Delete weir" button you can remove this weir. For each weir you can specify the name of the weir. The specification of detailed information for each weir is made subsequently. From the List View page you can go to the dialog for specification by clicking on the "Go to .." button or by selecting a weir in the Weir list and clicking on "Edit weir" button.
In the Geographic View it is also possible to create a new weir by double-clicking a position on the map. This position will be the first point defining the cross-section for the weir or by selecting “New weir”. The name of the weir must then be specified and the geographical position of the weir can then be edited. The additional information for the weir is made subsequently.