This is the README file for animations in AVI format illustrating
simulation of chlorofluorocarbon-11 (CFC-11) concentrations in one
calibrated and two alternative ground-water flow and transport models documented in 
U.S. Geological Survey Scientific Investigations Report 2007-5068:

Simulations of Ground-Water Flow, Transport, Age, and Particle Tracking near York,
Nebraska, for a Study of Transport of Anthropogenic and Natural Contaminants (TANC)
to Public Supply Wells
By Brian R. Clark, Matthew K. Landon, Leon J. Kauffman, and George Z. Hornberger

A PDF file format of the report is available online at http://pubs.usgs.gov/sir/2007/5068/

The animations were created using ModelViewer
version 1.1.1 for MS-WINDOWS
Hsieh and Winston, 2002.
The data for the animations were read from the *.cnb
output files from MODFLOW-GWT.

Animations consist of simulations of CFC-11 concentrations
from September 1, 1944, to August 31, 2004 and steay-state conditions representing
1997-2001:

CFC_sg_wAbnd.avi - Simulated CFC-11 in the upper confined aquifer of the
		calibrated model (with abandoned wells).
CFC_sg_NoAbnd.avi - Simulated CFC-11 in the upper confined aquifer of the
		First alternative model (without abandoned well model).
CFC_sg_SS.avi - Simulated CFC-11 in the upper confined aquifer of the
		Third alternative model (steady-state model).
Compare.avi - Comparison of the calibrated model with First and Third
              alternative models (without abandoned well and steady-state
              models)..
CompareXS.avi - Comparison of the calibrated model with First and Third
                alternative models (without abandoned well and steady-state
              models) in cross-sectional view.

Viewing of AVI files and HTML documents may vary widely 
depending on variables such as operating systems and user 
preferences. Preference settings in some browsers may 
cause a related mail client or previously loaded HTML 
document to become active. In other cases, when viewing 
animations, the AVI may be embedded in the browser. This 
requires user interaction with a single mouse click on 
the image to invoke the animation. Other browsers may 
spawn applications such as Windows Media Player that will 
automatically play the animation.

The use of firm, trade, and brand names is for identification purposes only
and does not constitute endorsement by the U.S. Geological Survey.

For additional information write to:
Director
U.S. Geological Survey Arkansas Water Science Center
401 Hardin Rd
Little Rock, AR, 72211