Goode, D.J., P.A. Hsieh, A.M. Shapiro, W.W. Wood, and T.F. Kraemer, 1993, Concentration history during pumping from a leaky aquifer with stratified initial concentration: p. 29-35 in Shen, H.W., S.T. Su, and Feng Wen, (eds.), Hydraulic Engineering '93, Proc. ASCE Hydraulics Div. National Conf., July 25-30, 1993, San Francisco, ASCE, New York.

ABSTRACT

Concentration history during pumping from a leaky aquifer with stratified initial concentration
Daniel J. Goode (1), A.M. ASCE, Paul A. Hsieh (1), M. ASCE,
Allen M. Shapiro (2), M. ASCE, Warren W. Wood (2), and Thomas F. Kraemer (2)

Analytical and numerical solutions are employed to examine the concentration history of a dissolved substance in water pumped from a leaky aquifer. Many aquifer systems are characterized by stratification, for example, a sandy layer overlain by a clay layer. To obtain information about separate hydrogeologic units, aquifer pumping tests are often conducted with a well penetrating only one of the layers. When the initial concentration distribution is also stratified (the concentration varies with elevation only), the concentration breakthrough in the pumped well may be interpreted to provide information on aquifer hydraulic and transport properties. To facilitate this interpretation, we present some simple analytical and numerical solutions for limiting cases and illustrate their application to a fractured bedrock/glacial drift aquifer system where the solute of interest is dissolved radon gas. In addition to qualitative information on water source, this method may yield estimates of effective porosity and saturated thickness (or fracture transport aperture) from a single-hole test. Little information about dispersivity is obtained because the measured concentration is not significantly affected by dispersion in the aquifer.

1-U.S. Geological Survey, 345 Middlefield Rd, Menlo Park CA 94025
2-U.S. Geological Survey, 431 National Center, Reston VA 22092

Keywords: Radon, New Hampshire, Granite, Effective Porosity, Fracture Aperture, Transport, Ground Water, Tracers, Type Curves, MOC3D, Mirror Lake NH, Grafton County NH

E-mail: djgoode, pahsieh, ashapiro, wwwood, or tkraemer@usgs.gov

Download PDF 2.1 Reprint (464K)

To Fractured Rock Hydrology Research Unit Home Page

Return to the Water Resources of Pennsylvania Home Page
or go directly to:





The URL for this page is http://pa.water.usgs.gov /projects/frhr/goode93.html
Please note our privacy statement and disclaimer
Accessibility

Answers to many common questions can be found on our
Frequently Asked Questions (FAQ) page. Please direct content comments
or questions to:

Information Specialist U.S. Geological Survey 215 Limekiln Road New Cumberland, PA 17070-2424	Phone: (717) 730-6916 FAX: (717) 730-6997 Email: is_pa@usgs.gov
or contact:
Director, USGS Pennsylvania Water Science Center U.S. Geological Survey 215 Limekiln Road New Cumberland, PA 17070-2424	Phone: (717) 730-6960 FAX: (717) 730-6997 Email: dc_pa@usgs.gov

Please direct web related comments to webmaster@pa.water.usgs.gov

sdww52