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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: