Attribute: OBER [m NN] (horizontal models only)

Upper boundaries can be used in elements where the lower boundaries are specified as well. The corresponding elements do not require the definition of thickness. However, the initial and maximum thicknesses are obtained by using both values, the lower and the upper boundary.

The data types thickness, upper and lower boundary can be used simultaneously in one model. However, for each element only one thickness definition can exist. The upper boundary is always assigned to elements. The unit is m NN. For 3D models, an upper limit can be defined by generating an additional layer with very low permeability.