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An analytical solution for design of bi-level drainage systems






Agricultural Water Management 37(1): 75-92, June

An analytical solution for design of bi-level drainage systems

The linearized Boussinesq equation has been used to formulate a boundary value problem for a bi-level drainage system. The validity of the solution has been established by comparison with an existing solution and field data reported in the literature. The results reveal that the proposed solution can be used in assessing the ground water table behaviour in a bi-level drainage system. The solution has been used to show that with increasing time, the location where maximum hydraulic head occurs moves towards the shallow drain. As the maximum hydraulic head approaches the shallow drain, drain discharge of the deeper drain is comparable with drain discharge from a conventional level drain system with double the spacing of the bi-level drains. Moreover, the decrease in hydraulic head is much slower compared to conventional level drain system once the hydraulic head approaches the shallow drain. Considering several issues that have been put forth as a result of many studies on horizontal subsurface drainage in India, it is proposed that bi-level drainage could be tried as a means of controlled drainage by appropriately deciding the depth of the shallow drain. As the proposed equation can not explicitly be used for drainage design, a computer programme has been reported to determine the lateral drain spacing.

Accession: 003037304

DOI: 10.1016/s0378-3774(98)00034-1

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