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LaTeX Math Block
anchorFetkovich_PSS
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\frac{d Q^{\downarrow}_{AQ}}{dt} + \frac{1}{\tau} Q^{\downarrow}_{AQ} = B_w \, J \cdot ( p_i - p(t))
LaTeX Math Block
anchor1
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q^{\downarrow}_{AQ}(t)=\frac{d Q^{\downarrow}_{AQ}}{dt} 

 which can be explicitly integrated:

LaTeX Math Block
anchorFetkovich_PSS
alignmentleft
Q^{\downarrow}_{AQ}(t) = J \, \exp \left(-\frac{t}{\tau} \right) \, \int_0^t  B_w(p) \, ( p_i - p(t)) \, \exp \left(\frac{t}{\tau} \right) \, dt
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titleDerivation
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Assumption #1 = Const Productivity Index Aquifer:

LaTeX Math Block
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q_{AQ} = \frac{d Q_{AQ}}{dt} = J_{AQ} \cdot ( p_{AQ}(t) - p(t))


Assumption #2 = Pseudo Steady State Flow:

LaTeX Math Block
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p_{AQ}(t) = p_i - \frac{Q_{AQ}}{V_{AQ} c_t}


Eliminating

LaTeX Math Inline
bodyp_{AQ}(t)
one arrives to
LaTeX Math Block Reference
anchorFetkovich_PSS
.

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