The Gonzales-New Orleans aquifer is an important source of fresh water for southeastern Louisiana. Withdrawals from the Gonzales-New Orleans aquifer in Jefferson and Orleans Parishes totaled about 33 million gallons per day in 1990, most of which was used for power generation and industrial purposes. Ground-water flow in the Gonzales-New Orleans aquifer within the study area is toward the center of a cone of depression in the potentiometric surface located just northeast of downtown New Orleans. The cone of depression has formed due to large withdrawals from the aquifer. During the spring of 1993, the altitude of water levels in the Gonzales-New Orleans aquifer within the study area ranged from about 100 feet below sea level in Orleans Parish, to about 11 feet below sea level in St. John the Baptist Parish. Water-level changes in the aquifer during the period 1987-93 ranged from little or no change in some areas, to a recovery of more than 15 feet in eastern Jefferson and western Orleans Parishes near Lake Pontchartrain. Water-level changes within the Gonzales-New Orleans aquifer are primarily related to changes in pumping.
Additional publication details
USGS Numbered Series
Louisiana ground-water map no. 11: potentiometric surface, Spring, 1993, and water-level changes, 1987-93, of the Gonzales-New Orleans Aquifer in southeastern Louisiana
Water-Resources Investigations Report
3 maps on 2 sheets : col. ; 26 x 45 cm. or smaller, on sheets 61 x 67 cm., folded in envelope 30 x 24 cm.