Question

Repeated flooding of an alluvial plain is causing concern to the local residents. The local water authority have decided to install drainage to permanently to lower the ground water level from 1m above datum to 1m below datum. The soil profile consists of 10.5m of firm to soft normally consolidated clay overlying limestone. The unit weight of the clay is 16kN/m³ and the coefficient of volume compressibility is 0.4m²/MN. The ground level is 1.5m above datum. Determine whether any ground movement will occur and how much.

Answer 1