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The design of drainage facilities for agricultural land requires quantitative evaluation of (1) the water involved; (2) the permeability of the materials through which the water flows; (3) the dimensions of the aquifer; and (4) the position of the water table. This paper details techniques utilized in the determination of the coefficient of permeability in the laboratory and in the field. It further presents the need for rapid techniques of indirect determination of permeability, but recognizes the limitations of this method. The application of the coefficient of permeability in the analysis of a drainage problem or facility is outlined, and a formula for the spacing of tile‐drains utilizing the coefficient of permeability is presented.

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