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The Plaue River alluvial aquifel; which underlies the Plaue River Valley, is an important source of water Jor public supply in central and eastern Nebraska. Knowing the age of ground water can help scientists and waler managers beller understand the dynamics of the ground-water system. In turn, this knowledge will help in calibrating ground-water-flow models and aid ill developing a conceptual understanding of how long it takes for recharge water 10 reach certain areas of the aquifer. Although previous studies (Davis, 1992; Steele and Verstraeten, 1999; Verstraeten and others, 1999) reported the interaction of surface water and ground water at the municipal well field near Ashland for the city of Lincoln, Nebraska (fig . I), and quantified, to some degree, the interaction of the Plalle River with the underlying alluvial aquifer, no significant amount of work had been done to quantify the age of the ground water at this well field. Therefore, in 2001 the U.S. Geological Survey (USGS) and the city of Lincoln engaged in a cooperative study to determine the areal and vertical age distribution of the water at selected monitoring-well sites in the well field at Ashland. Thisfact sheet summarizes the results of that study.

Age of ground water at city of Lincoln's municipal well field near Ashland, Nebraska