The purpose of this report is to provide a glossary of selected terms for
saturated and unsaturated flow and related processes involved in transport of
contaminants in the subsurface. The glossary contains five tables. Table 1
is a list of parameters with associated symbols and units. Tables 2 to 5 are
conversion charts. The original manuscript was prepared by Thomas J.
Nicholson, U.S. Nuclear Regulatory Commission. It was subsequently examined
by the Ground-Water Glossary Working Group and experts within and outside the
Federal Government, whose recommendations were accommodated where appropriate in the glossary. It is hoped that the glossary will aid in the communications
between soil scientists, hydrologists, and hydrogeologists.
The terms defined in the glossary were selected after an extensive survey of
glossaries and reports in the areas of (1) ground-water geology, hydraulics,
and chemistry, (2) soil-water physics and chemistry, (3) contaminant
transport, (4) unsaturated-zone hydrology, (5) chemistry and transport of
solutes, and (6) ground-water quality. Some of the definitions have been
modified for clarity from a variety of technical sources. Where more than one
definition appears for the selected term, the first one was determined by the
working group to be the most appropriate general definition, followed by
other, more specialized, definitions. Some terms and definitions are not
currently in use by all agencies; however, they are included in the glossary
because they can be found in the literature. The reader is encouraged to
consult with the original source cited for more explanatory comments.
Additional regulatory definitions, which are underlined and are taken directly
from the Code of Federal Regulations (CFR) and Federal laws (USC), were added
following review by the various Federal agencies in May 1986.
The definitions and conversion charts are from two principal sources provided
herein. The first is the 11Glossary11 compiled by A. I. Johnson in the 1981
report by the American Society of Testing and Materials titled Permeability
and Groundwater Contaminant Transport. The second is Manu a 1 40, 11Ground-water
Management, 11 produced by the American Society of Civil Engineers in 1985.
Additional Publication Details
Federal Government Series
Subsurface-water flow and solute transport: federal glossary of selected terms
U.S. Geological Survey, Office of Water Data Coordination