Sheetpiles are used to keep water out of a bridge pier construction site, as depicted in Figure P7.8.3 (drawn to scale). Determ.ine the quantity of seepage (in m3/hr per unit length of sheetpile) that can be expected in order to design an appropriate pump to dewater the construction site. The appropriate seepage dimensions are d = 3. 5 m, b = 4. 7 m, and z = 1.3 m. The permeability i0. 195 m/day, and the porosity is 0.35. Also determine the approximate exit velocity of the water (in m/sec) next to the sheetpile. (Note: If this velocity is high enough, it may transport the soil with it and eventually undermine the sheetpile).

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Impervious sheetpile Construction site Figure P7.8.3