Knowing that lining irrigation canals will save huge amounts of irrigation water and achieve fair water distribution, but will we prevent deep percolation ?
Yes, you are preventing deep penetration and percolation of the fresh water table by lining irrigation canals. I would reach out to Chris Choppin of EQR to help you better understand and plan the best options.
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The lining of canal prevents seepages of water that raise the water-table creating the twin problem of waterlogging and salinity. However, in case of saline groundwater, the seepages from the canal develops layer of fresh water of varying thickness that is being utilized for irrigation purpose, drinking etc. However, lining prevents the seepages from the canal resulting in reducing the groundwater recharge causing the fresh water shortage. In this case, canal lining without cement concrete bed may be a potential solution. This technique on one hand reduces the rise of water-table and on other hand recharge the groundwater.
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