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lined are man-made and lined with cement and stone. Unlined are natural water ways (rivers, etc.) ,or hand/machine dug canals that are re-dug and bottom drudged regularly to keep them passable
Wiki User
∙ 13y ago
Anonymous
Wiki User
∙ 10y agolined canals and unlined canals both are man made. The difference is that lined canal are lined with concrete, bricks or stone.
purpose to do it :-
1) to avoid seepage of water through soil ,where soil is made of sand. The percolation rate of water to that type of soil is much more. When there is a scarcity of water and we don't want wastage of water at any cost.
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What is the differences between the coelum and acoelum?
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What animal has long eyelashes and hair-lined ears that block blowing sand?
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