This equation is the same as that for transient confined flow. However, Ss is related to Sp as Ss = Sp/$, where $ is the average piezometric head in the aquifer.
Transient Radial Flow (Theis Solution)
The governing equation for the transient radial flow (flow toward a well in an aquifer of infinite extent) is obtained when Equation 9.7(10) is rewritten in terms of radial coordinate r as d2$ 1 d$
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