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The following brief informal paper was originally prepared by C. V. Theis in 1941 as a Jlemorandum in answer to an inquiry from W. N. White, then District Engineer (G'N) at Austin, Tex. It shows how much the computed drawdowns at equilibrium, assuming an infinite line source, would have to be increased to take into account the faulting in the outcrop of the Carrizo sand in the Lufkin area, Texas. A more detailed map and discussion of the area referred to on page 3 are given in a paper by W. F. Guyton entitled "Results of pumping tests of the Carrizo sand in the Lufkin area, Texas," which appeared in the Transactions of the American Geophysical Union, part I, pages 40-48, 1942. Theis' memorandum is reproduced herewith as another in the Hydraulics series of Ground Water Notes for distribution to Branch personnel. It will serve as a useful complement to Ground Water Note No. 14 (Hydraulics), which considered the situation of a discharging well diverting water from a nearby infinite line source. Theis' original memorandum form is maintained, except that an abbreviated table giving values for hyperbolic cosines is appended.

Computation of drawdown at equilibrium caused by wells drawing water from an aquifer fed by a finite straight-line source