Dowsers and diviners notice that where an underground stream line has been deflected by the building foundations, as a result of this deflection the geopathic stress produced is much worst. This is particularly uncomfortable for those sitting or sleeping in the affected rooms inside. Heavy excavations and digging in the neighborhood of a house can shift the fields there considerably. You can find as a result that you end up with geopathic stress in a house where there was none before.
When something like this happens people invariably notice a sudden heavy change in the atmosphere of a house. The important point of course is not to ignore this but instead to get it checked out to be sure. Where water lines are detected they can be neutralized and dispersed using traditional techniques which have worked for centuries