The area shown in figure below is provided with a tile drainage system. knowing that: 1-Depth of the drains below land surface =1.5 m. 2-Depth of the impermeable layer below land surface =9.5 m. 3-Design root depth =1.2 m. 4-Drainage rate =2 mm/day. 5-Soil permeability =0.4 m/day. Determine. 1-Choose a suitable spacing and diameter for lateral’s 2-Determine the maximum area served by one collector if the available pipe diameters are 20 cm and 25 cm

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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.