Transient ditch drainage of two-layered soil

The analytical solution to the problem of transient drainage without replen ishment for a two-layered soil, by applying Girinsky's potential, has been presented. The effect of various parameters on drainage has been evaluated, and a set of relationships has been developed that may help in the design of drainage in layered soils. The proposed analytical solutions have been e xperimentally investigated on a vertical Hele-Shaw model in which the two-l ayered soil conditions were simulated. The comparison of results of propose d analytical solutions with the experimentally observed ones in the Hele-Sh aw model showed that the experimentally observed and predicted midpoint wat er tables were found to be in good agreement for the entire duration of the experiment. The proposed theoretical model may be utilized for transient d esign of a drainage system in a two-layered soil.