Unconfined Aquifers

The sp values in Figure 9.9.6 also give reasonable estimates of Qp/Q for wells in unconfined aquifers, particularly if the drawdown is small compared to the aquifer thickness and the well has been pumped for some time (Bouwer 1978).

Forchheimer (1898) observed that the discharge Qp of a well with a perforated casing and closed end becomes larger, at equal drawdowns, as the immersed depth Le of the perforated well increases. He assumed that the increase with depth varies with the geometric mean between the parabolic and elliptic ordinates and showed an efficiency to be

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