Ground-Water Levels and Pumpage in the Metro-East Area, Illinois, 1986-1990

摘要

This report discusses ground-water levels and pumpage in the Metro-East area justsouth of Alton, Illinois, to Dupo, Illinois, and between the Mississippi River and the river bluffs from 1986-1990. Large quantities of ground water, primarily for industrial and municipal use, are withdrawn from wells penetrating a sand-and-gravel aquifer along the valley lowlands of the Mississippi River. Ground-water levels throughout the entire area were stable but elevated during 1986 and 1987. Water levels declined from 1988 to 1989 and increased in 1990. Factors contributing to this pattern were above-normal precipitation the Midwestern drought of 1988-1989, changes in river stages, and the response of water levels to annual pumpage changes.