The Lufkin Area, as the term is used in this paper, is comprised of Angelina and Nacogdoches counties, Texas, and parts of adjoining counties. Its surface is gently rolling, with a maximum relief of about 150 feet and a maximum altitude of less than 400 feet. The average annual rainfall is about 45 inches. Practically all of the water‐supplies in the area come from ground‐water and it has been found that the Carrizo sand contains water of better quality and is more productive than any other water‐bearing formation in the area [see 1 of “References” at end of paper]. Figure 1 is a map of the area, showing the positions of the cities of Lufkin and Nacogdoches, the wells of the Southland Paper Mill, and other wells mentioned in t