Stream Loss Contributions to a Municipal Water Supply Aquifer in Memphis, Tennessee
- 9 July 2013
- journal article
- Published by Association of Environmental and Engineering Geologists in Environmental & Engineering Geoscience
- Vol. 19 (3), 265-287
- https://doi.org/10.2113/gseegeosci.19.3.265
Abstract
Leakage of water into the semi-confined Memphis aquifer near the Sheahan well field in Memphis, Tennessee, has been suggested by many studies extending back to the 1960s. A leakage pathway from Nonconnah Creek to the Sheahan well field was investigated over a 1-year period using multiple approaches: (1) stream discharge data, (2) hydraulic head data, (3) geochemical and environmental tracer (3H/3He and chlorofluorocarbon) studies, and (4) geochemical modeling. The stream loss data strongly support the conclusion that losses from the creek contribute at least 2,600 m3/d to the shallow aquifer, and hydraulic head data consistently indicate the majority of this infiltrated surface water flows within the shallow aquifer toward the Sheahan well field. Tritium-3He data from shallow aquifer monitoring wells within the Sheahan well field are composed of modern water with ages that generally increase with distance from the creek toward the well field. The leakage pathway from the creek to the well field is interpreted to involve seepage of creek waters into the shallow aquifer, mixing with other water sources and chemical reactions as the infiltrated waters flow in the shallow aquifer along a paleovalley toward the Sheahan well field, as well as leakage from the shallow to the Memphis aquifer through a hydrologic window in the upper Claiborne confining unit. The results of this work emphasize the utility of multiple investigative approaches in studies of groundwater flow to well fields, but they also illustrate the complexity of groundwater flow and groundwater vulnerability in a stressed water-supply aquifer system.Keywords
This publication has 22 references indexed in Scilit:
- Resolving the source and mixing proportions of modern leakage to the Memphis aquifer in a municipal well field using geochemical and 3H/3He data, Memphis, Tennessee, USAEnvironmental Earth Sciences, 2011
- Resolving aquifer behavior near a focused recharge feature based upon synoptic wellfield hydrogeochemical tracer resultsJournal of Hydrology, 2006
- 3H/3He age data in assessing the susceptibility of wells to contaminationGroundwater, 2005
- OZIMA, M. & PODOSEK, F. A. 2002. Noble Gas Geochemistry, 2nd ed. xiv + 286 pp. Cambridge, New York, Melbourne: Cambridge University Press. Price £55.00, US $80.00 (hard covers). ISBN 0 521 80366 7.3Geological Magazine, 2003
- Palaeotemperature reconstruction from noble gases in ground water taking into account equilibration with entrapped airNature, 2000
- Environmental Tracers in Subsurface HydrologyPublished by Springer Science and Business Media LLC ,2000
- Leachate Geochemistry at a Municipal Landfill, Memphis, TennesseeGroundwater, 1994
- Geomorphological interpretations of late Quaternary terraces in western Tennessee and their regional tectonic implicationsPublished by US Geological Survey ,1987
- Determination of tritium by mass spectrometric measurement of 3HeThe International Journal of Applied Radiation and Isotopes, 1976
- Ground-water supply of the Memphis areaPublished by US Geological Survey ,1958