H. W 1: A (6 m) layer of sand overlies a (5 m) thick layer of clay with a sand deposit beneath. The water table is to be lowered permanently from (1 m) below ground level to (4 m) below ground level, by pumping from the sand over a period of (6 weeks). Determine the settlement due to consolidation of the clay layer 6 months) from the start of pumping. For the clay: m2 my = 0.45 m² / MN and cy = 5.5 year 0.008 0.031 0.071 0.126 0.196 0.287 0.403 0.567 Ty U% 10 20 30 | 40 50 60 70 80