Horizontal and slanted wells in an unconfined aquifer
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: