Grid Points

Grid points are the computational points in a reach. At each grid point a dependent variable is defined. For a flow model this is either water level or discharge.

A reach has a number of grid points along its length, at certain locations. Grid points do usually not coincide with the digi points. To get the geographical coordinate of a grid point, the grid point’s chainage value is used to interpolate along the digi point coordinates.

A flow model has different types of grid points:

• H grid point. The water level is defined in the H grid point. It also has an associated cross section.
• Q grid point. The discharge or flow velocity is defined in a Q grid point.
• Structure grid point. A structure grid point has an associated structure, that calculates the discharge over the structure depending on the water levels on each side of the structure.