Attribute: NMGK [-] (only for Meßer method), (element-wise) (horizontal and 3D models only)

The elements are divided into four different classes depending on their associated surface gradient/slope. The division of the classes is discussed in detail in the chapter calculation of the groundwater recharge rates . The slope classes are determined using a digital terrain elevation model. The following figure shows an example of the surface elevation in a model:

Example of surface elevation in a model