Abstract
Ground water in Precambrian gneisses and granites exists only in faults and joints in the rock. By fabric analysis it is possible to separate two main groups of these fractures: the local pattern, syntectonic to the fold axis, and the grain fabric and the post-crystalline pattern. Within certain limits the latter may be generalized to a tectonic model. The faults and joints of the local pattern produce a very low yield of ground water. It is shown in the paper how some of the faults and joints of the postcrystalline pattern may give a high yield of ground water and their relation to the tectonic model.
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