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عمران::
معادلهی غیرتعادلی
Equation 9.1 is Theis's nonequilibrium equation.
Equation 9.4 or 9.5 is called Jacob's modified nonequilibrium equation (Jacob, 1940),
As illustrated in the figure, when t is considerably large, causing u < 0.05, the relationship between the drawdown and pumping time in terms of the logarithm value becomes linear, which is also Jacob's modified nonequilibrium equation.
Substitute the influence range ( R) of Eq. 9.6 into Eq. 9.5, Jacob's modi- fled nonequilibrium equation, we then have Eq. 9.9.
a special case of Jacob's modified nonequilibrium equation.
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