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Question 9 1 points A riverbed consists of a layer of sand 8.25 m thick overlying Impermeable rock; the depth of water is 2.6 m. A long cofferdam 5.5 m wide is formed by driving two lines of sheet piling to a depth of 6.0 m below the level of the riverbed and excavation to a depth of 2.0 m below bed level is carried out within the cofferdam. The permeability of sand is 2.65x105 m/s. The flow of water into the excavation is: Sheet piling Shoot pilling 0.90 m 4.2x10-5 m³/s per unit length 2.5x105 m³/s per unit length 7.3x105 m³/s per unit length 8,0x105 m³/s per unit length pom 6.00m 2.25m Datum