FIG. 9.8.12 Slug test setup. (Reprinted from H. Bouwer, 1978, Groundwater hydrology, McGraw-Hill, Inc.)

Le = height of the perforated, screened, uncased, or otherwise open section of the well through which groundwater enters yo = y at time zero yt = y at time t t = time sine yo

In Equation 9.8(58), y and t are the only variables. Thus, if a number of y and t measurements are taken, they can be plotted on semilog paper to give a straight line. The slope of the best-fitting straight line provides a value for ^n(yo/yt)/t. All other parameters in Equation 9.8(58) are known from well geometry, and K can be calculated.

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