Soil sample and flow conditions are shown in the following figure: C -Inflow Outflow h B 2 m Soil 10 m 2 m Ysat of sand = 20 kN/m Yw = 10 kN/m Figure not to scale (i) (ii) (iii) Find the head, h required to cause quick condition. Compute the seepage force per unit volume at quick condition. Use cross-section area of tube as 1 m. A student accidentally broke the left hand riser tube to the point C at an elevation 2 m above point A. Assuming that the water level is now maintained at C, compute the new hydraulic gradient, effective stress at elevation A and seepage force at elevation A.