Technical Assistance - Wells suitable for heat-flow measurement


               UNITED STATES DEPARTMENT OF THE INTERIOR
                          GEOLOGICAL SURVEY
                      WATER RESOURCES DIVISION
                         WASHINGTON 25, D. C.

                                                    May 8, 1964
                                                 Code 4056 0001

GROUND WATER BRANCH MEMORANDUM NO. 64.33

To:       District Chiefs and Staff Officials

From:     Chief, Ground Water Branch

Subject:  Technical Assistance - Wells suitable for heat-flow
                                 measurement

The Theoretical Geophysics Branch is studying the distribution of
heat flow from the earth's crust and is having difficulty locating
wells or test holes that can be used for heat-flow measurements.
Because of our contact with and knowledge of so many wells, they
have asked us to help locate wells that will fulfill the rather
stringent requirements.  The attached brochure, prepared by the
Theoretical Geophysics Branch, sets forth the specifications for
the type hole best suited to their needs.

If you now know of any wells that appear to be suitable, or hear
of such wells in the future, please inform us and we will pass on
the information.



                                   (s) J. T. Callahan
                                   for O. M. Hackett

WRD Distribution:  A, B3, S3, FO3, SL