## Hz

7S&

Ay qAy

FIG. 9.3.2 Semiconfined flow.

Continuity now requires that the sum of these quantities be zero, hence

where c1 = d1/K1 and c2 = d2/K2, which are called hydraulic resistances of the confining layers. The terms (fi — &)/c 1 and (fi fi2)/c2 represent the vertical leakage through the confining layers.

Defining leakage factor A = VTc where T = KH, the transmissivity of the aquifer, Equation 9.3(7), can be written as

This equation is the fundamental equation of semiconfined flow. When the confining layers are completely impermeable (K1 = K2 = 0), Equation 9.3(8) reduces to Equation fo f (r)

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