The Benker grid is a 10 x 10m (about 30 x 30 ft) earth grid named after Anton Benker, a German dowser from Bavaria. The distance between grid lines is around 10m, the lines themselves having a thickness of around 20-30cm. It is exactly congruent with the Hartmann Grid and may be a higher resonance of same. It is sometimes called the Benker Cubical Grid because it has three-dimensional symmetry. Dimensions and intensities can vary dependent on geographic latitude and the specific location.
The Benker grid tends to have more of an electromagnetic nature than the other grids and some people are more sensitive to it than others.
(Source: British Dowsing, britishdowsing.net)