A rectangular canal, 6.45 m wide and 1.45 m deep lined with smooth stone ( n = 0.013) Has a hydraulic slope of 0.001 Channel is laid 5 m long What savings in earth excavation ( m3) Choices: 0.71, 1.71, 7.11, 11.7 and lining (m2) were introduced using the most efficient rectangular section but adhering to the same discharge and slope? Choices: 1.99, 2.99, 3.99, 4.99

1. The following is a sketch of the proposed embankment, calculate the addition of vertical stress (Bousinesq method / graph below) at the depths of points A and B. Assume the unit weight of the soil stockpile = 20 kN / m3. 2. Calculate the added vertical stress at points A and B as deep as Z = 8 m, under the rectangular load

Don't copy from Chegg. I need right solution with clear calculations

A layer of fine sand exists over a stratum of impervious rock. The sand layer is 6.25m thick. The site is flooded and the water surface is 1.25m above the surface of the sand. It is proposed to excavate a very wide ditch through the site and to remove sand to a depth of 2.5m below the existing surface of the sand. One side of the excavation is to be supported by sheet piling driven to a depth of 4.4m below the existing surface of the sand. Draw a flow net and determine the seepage in m³/min per m length for the sand with a permeability of 0.18m/sec.