A double wall sheet pile coffer dam retains a height of water 9 m on one side. A flow net  constructed for this structure, driven into a pervious deposit overlain by an impervious  ledge, consists of five flow channels and fifteen potential drops. The length of the coffer  dam is 90 meters. If the coefficient of permeability of the pervious deposit is 10^–2 mm/s. Determine the seepage in cubic meters per day.

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Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.