Quantifying Upland Aquifer Systems (IMAGE) University of Massachusetts Amherst Caption At left, Seth Oliver with Leah Santangelo, right, both hydrogeology UMass Amherst graduates, taking water level measurements at a till site in Blandford, Mass., for a recent study of natural groundwater storage reservoirs in New England by hydrologist David Boutt at the University of Massachusetts Amherst. For the first time, they quantified upland aquifer systems dominated by thin deposits of surface till -- a jumbled, unsorted material deposited by glaciers, which make up about 70 percent of the active and dynamic storage for the region. Credit UMass Amherst Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.