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Do banks still offer clients to open Christmas Clubs and you pay into a little each month and around Christmas time take the money saved and buy gifts ?
A large excavation was made in a stratum of stiff clay with a saturated unit weight of 18.64kN/m3. When the depth of excavation reached 8m, the excavation failed as a mixture of sand and water rushed in. Subsequent borings indicated that the clay was underlain by a bed of sand with its top surface at a depth of 12.5m. To what height would the water have risen above the stratum of sand into a drill hole before the excavation was started.