Sand is contained in a hopper that is in the shape of an inverted circular cone. Sand flows out of the vertex ata rate of 10 m3 /min. The cone has a height of 10 m and a rope diameter of 12 m. Find the rate at which the surface level of the sand is falling when the depth of the sand is 3m above the vertex. a. The surface level of the sand is falling at a rate of 125/9pi m/min b. The surface level of the sand is falling at a rate of 125/162pi m/min c. The surface level of the sand is falling at a rate of 10/9pi m/min d. The surface level of the sand is falling at a rate of 259/81pi m/min

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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.