G'morning tinpan my very good friend and swr: May I suggest that you rerview the following backed by official government documents. It is just one of many reports but will do for now.
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http://calteches.library.caltech.edu/655/2/Books.pdf
And especially -->Roberts, Kenneth. Henry Gross and His Dowsing Rod.
Garden City, N.Y., Doubleday, 1951.
Hardcover in Dust Jacket. (tan cloth w/ black and gilt titles)
reprinted several times.
The story of Henry Gross as told by Kenneth Roberts, who first encountered him in 1947 in Kennebukport, Maine, where Roberts lived on his farm which was being threatened by a huge forest fire. Later Roberts was instrumental in helping Gross develop his skill and to bring it to the attention of scientists.
' In 1949 the island of Bermuda, which traditionally relied upon roof top rainwater catch-basins, was hit by the worst drought in four decades. Even though hydrologists declared that there was little underground fresh water available, dowser Henry Gross 'map-dowsed' from his home in Maine the general locations of 4 good freshwater sources in Bermuda. Already existent wells had provided little palatable water, being mostly salty or brackish in content. When Gross was summoned to Bermuda, he accurately pinpointed his four locations which in turn were drilled for water. They were completed in 1950, wherein the four wells were able to produce two million gallons of fresh water per day for public consumption'.
Roberts, Kenneth. The Seventh Sense.
Don Jose de La Mancha