Canal lining

 

                              Canal lining



1.What is canal lining?

An impermeable layer is provided at the bed and sides of canal to improve the life and discharge capacity  of canal known as canal lining. Generally seepage can result in losses of 30 – 40 % of irrigation water in canals, so this can be reduced by providing lining to the canal.

2.Importance of lining of canal 

An important reason for lining a canal can be the reduction in water losses, as water losses in unlined  irrigation canals can be high. 

Canal lining Minimizing water losses is very important, and especially so in schemes where irrigation water is pumped. 

Reduced water losses resulting in less water to pump and thus a reduction in pumping costs.

3.Advantages of Canal Lining

  • Ø  The seepage of water will cause very wet or waterlogged conditions, or even standing water on adjacent fields or roads. Lining of such a canal can solve this problem.(since the permeability of a lined canal bank is far less than that of an unlined bank, or may even be zero, depending on  the lining material.) 

     

    Ø  The roughness – resistance to flow – of a lined canal is less than that of an unlined canal, and thus the flow velocity will be higher in the lined canal compared to an earthen canal  surface even the canal bed slope is the same. 

     

    Ø  Even the hard surface of the lining material allows a higher velocity compared to an earthen canal surface as it will not allow erosion of bed and side slope.

     

    Ø  The higher velocity that can safely be allowed in the lined canal prevents the small  articles of soil carried in the water from settling out, accumulating and causing siltation.

     

    Ø  A surface lining, such as concrete, brick or plastic, on the canal prevents the growth of plants and discourages hole-making by rats or termites, and so the maintenance of a lined canal can be easier and quicker than that of an unlined canal.

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