trench 80 ft long is excavated 500 ft away and is parallel to a riverbank. A sand aquifer is 40 ft thick The river water surface is 50 ft above the horizontal bottom of the aquifer. If the water depth in the trench must be maintained at 10ft, at what rate must water be pumped from the trench? How far from the trench will the aquifer cease to be saturated? Use K of sand = 30 ft/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.