An extent of hydraulic gradient line can be reduced considerably by providing murum filter at the base of the bund. This helps in reducing the recommended bund section by keeping the side slope the same as is presently advocated. The results Indicated that the cross sections of the contour bunds with provision of murum filter can be reduced from 18.94 to 30.23 per cent according to the soil depth, over the presently recommended sections which ultimately helps in reducing the cost of cons- truction of the bunds.
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Tamil Nadu Agricultural University
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