## Transientstate

Three methods of analysis are the type-curve method (Theis), the Cooper-Jacob method, and the Chow method. These methods are briefly described.

Type Curve Method (Theis)

The Theis equation, Equations 9.7(20) and 9.7(14), can be written respectively as log s

r2 4T

If these two equations are plotted on the same log-log paper, the resulting curves are the same shape but horizontally and vertically offset by the constants Q/4 ttT and 4T/S. If each curve is plotted on a separate sheet, the curves can be made to match when the sheets are overlapped as shown in Figure 9.8.2. An arbitrary point on the matching curve is selected, and the coordinates of this matching point are read horizontally and vertically on both graphs.

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