Perched water tables on hillsides in western Oregon: I. Some factors affecting their development and longevity.

Perched water tables on hillsides located on the western border of the Willamette Valley in Oregon in some cases have the potential to transport pollutants from either domestic or agricultural sources downslope to streams, ponds, or reservoirs, resulting in the deterioration of the quality of these waters. Some factors responsible for the development and longevity of these potentially problem-causing perched water tables on three hillsides were examined. -from Authors