4

Perfect well 1

Imperfect wells 3 4

Perfect well 1

Imperfect wells 3 4

; aquifer

; aquifer

FIG. 9.9.4 Types of artesian imperfect wells. (Reprinted from A.R. Jumikis, 1964, Mechanics of soils, Van Nostrand.)

FIG. 9.9.4 Types of artesian imperfect wells. (Reprinted from A.R. Jumikis, 1964, Mechanics of soils, Van Nostrand.)

FIG. 9.9.5 Partially penetrating wells. (a) In a confined aquifer. (b) In a phreatic aquifer. (c) Drawdown curves along streamlines. (d) Zero penetration in a thick aquifer.

FIG. 9.9.5 Partially penetrating wells. (a) In a confined aquifer. (b) In a phreatic aquifer. (c) Drawdown curves along streamlines. (d) Zero penetration in a thick aquifer.

tom. If the open section of the well is in the center of the aquifer (Figure 9.9.5-a), vertical flow components occur at both the top and bottom of the section. For this case, Qp/Q can be obtained for the half-section when the section is split symmetrically along the midway.

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