(b) Calculate the spacing of tile drains if 1.25% of average annual rainfall of 75cm is to be drained in 24 hours when drains are positioned at 1.8 m below the top soil surface and the depth of highest position of water table below top soil surface is 1.5 m. The depth of impervious stratum from the top soil surface is 12 m. Permeabilty of soil may be assumed as 0.01 cm/s.

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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.