UNSTEADY-STATE DRAINAGE IN A VERTICALLY HETEROGENEOUS SOIL

An analytical model is presented for prediction of transient water tab le heights between two parallel drains for a vertically heterogeneous soil. The drains lie on a horizontal impervious layer. The model was a pplied to field conditions for prediction of water table fluctuations in a clay soil whose hydraulic conductivity decreased exponentially wi th depth. The predicted results compared reasonably correctly with fie ld observations for a given long-term rainfall input.