The bottom of a river is 37 ft. below the water surface, Underneath the bottom of the river is a layer of silt which has a specific gravity of 1.79. If a pressure of 77 lb.per sq. in. is recorded at a tunnel at the bottom of the silt layer, how thick is this layer of silt in ft. ?

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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.