A retaining wall with a smooth vertical back retains sand backfill for a depth of 6 m, The back fill is horizontal and the soil retained has the following properties = 30 e=0.74 and G=2.68 For the same problem, if the water table vises up and Comes 2 m below G.L. Then determine the magnitude and point of application of the resultant thoust on the wall due to active earth pressure.