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\[t = \frac{{\pi \cdot \left( {3.3 \times {{10}^{ - 4}} \cdot V - 0.5} \right)}}{{1 \times {{10}^{ - 6}}}}\]  Table 2 lists values of t for different values of V. The values of V were chosen corresponding to changes in the porosity of a 350m thick unit of shale of 0.1, 1 and 10\% on dewatering. The corresponding values of t are 1.76, 176 and 17600 years respectively.