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With the introduction of irrigation in areas with rolling topography, low-lying areas are prone to water logging and soil salinization. The problems also occurred in the valley bottoms of the Tungabhadra Irrigation Project (TBP). Subsurface drainage was applied to reclaim the waterlogged saline land in an area of 62ha (1ha = 10,000m 2 ). The drainage system consisted of three pipe drains laid...
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