PUBLICATIONS: Techniques manual, "Application of Surface Geophysics to Ground-Water Investigations," Book 2, Chapter D1, by A. A. R. Zohdy, G. P. Eaton, and D. R. Mabey.


            UNITED STATES DEPARTMENT OF THE INTERIOR
                        GEOLOGICAL SURVEY
                     Water Resources Division
                       411 National Center

                                                August 19, 1974

GROUND WATER BRANCH TECHNICAL MEMORANDUM NO. 75.02

Subject:  PUBLICATIONS:  Techniques manual, "Application of
                         Surface Geophysics to Ground-Water
                         Investigations," Book 2, Chapter D1,
                         by A. A. R. Zohdy, G. P. Eaton, and
                         D. R. Mabey.

Attached are copies of the WRD manual on application of surface
geophysics to ground-water investigations.  Please bring this
publication to the attention of all district and project personnel
concerned with ground water.  The manual describes the general
physical principles underlying the electrical, seismic, gravity,
and magnetic methods and their capabilities, applications, and
limitation.

Examples of applications of surface geophysical methods are given
for selected geohydrologic environments to illustrate their uses.

This manual is intended to provide the hydrogeologist with a
sufficient understanding of the capabilities, limitations, and
relative cost of the various surface geophysical methods so that
he can make sound decisions as to appropriate use of these
methods.  The manual provides enough information for the
hydrogeologist to work with a geophysicist in designing
geophysical surveys that differentiate significant subsurface
hydrogeologic units.

A companion volume, "Application of Borehole Geophysics to Water
Resources Investigations," by W. Scott Keys and L. M. MacCary,
Book 2, Chapter E1, was distributed March 14, 1972.



                              (s) Charles A. Appel
                              for Chief, Ground Water Branch

WRD Distribution:  A, B, S, FO, PO