Fig. 22.1 and Fig 22.2 show the relation between W(u) and u, and r²/t and S. The r²/t and S is obtained from observed data.

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  Fig.22.1 Relation between W(u) and u
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• Fig 22.2 Relation between r²/t and S

• Fig 22.3 Superimposition of the relation between W(u) and u, and r²/t and S

Fig. 22.3 show the superimposed relations between the plot W(u) verses u, S verses r²/t. Considering a suitable convenient point on the superimposed curve, the values of W(u), u, Sand r²/t can be obtained. The aquifer parameters (T,S_s) can now be computed using the equations (22.2) and (22.3).