NRC video I

Island Building Underwater

This model test uses a circular array of drainage wells in order to form an "island" shaped sandfill.

The clip shows the ring being lowered onto the submerged sand bed, and then, the beginning of sand jetting into its centre.

Shortly afterwards the jetting is temporarily halted to look at what progress has been made.

After the dust has settled, the outer perimeter of what will eventually become a circular island can be seen as an annular triangular mound immediately adjacent to the wells - where the Seepage Forces are at their greatest intensity.