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## Conceptual models > Horizontal pumping wells >## Unconfined aquifer |

Horizontal and slanted wells in an unconfined aquifer

a b

c d

e

Cross-sections and plan view: a, c – piezometer, b, d – observation well

Unsteady-state flow equations:

1) for piezometer

2) for observation well

Θ – the angle between the bottom and the well, degrees.

Equations are treated by the algorithm of WHI program (авторы Zhan H. и Zlotnik V.A., 2001).

Equations can take into account the effect of the delayed drainage, the calculation of which involves the reciprocal of Boulton’s delay index: