Groundwater quality in the San Francisco Bay groundwater basins, California

Abstract

Land-subsidence and the resultant damage because of excessive groundwater pumping, in combination with periodic drought, have a welldocumented history in the south San Francisco Bay area. Land-elevation surveying data from 1934 to 1967 indicate that subsidence ranged from 0.1 to approximately 0.5 foot in the vicinity of the study area. It could not be determined from landsurface elevation surveying data from 1993 whether subsidence is currently occurring in the study area.