why CCT were dug on hill slopes
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Trenches are dug in line with the topographic contours. Distance between two trenches depends upon the slope. CCTs are employed to stop the loss of soil and reduce the rate of water runoff, resulting in increased water percolation.
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Contour trenches are ditches dug along a hillside in such a way that they follow a contour and run perpendicular to the flow of water. The soil excavated from the ditch is used to form a berm on the downhill edge of the ditch. ... Construction of CCT helps to stop the soil loss.
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