To reduce water losses in canals, what method is often employed?

The correct answer is: All of the above.

Lining canals with concrete can help to reduce water losses due to evaporation and seepage. Desilting can help to remove sediment from canals, which can reduce the amount of water that is lost due to infiltration. Reducing seepage can be done by installing linings or by using other methods to reduce the amount of water that flows through the canal bed.

Here is a brief explanation of each option:

• Lining canals with concrete can help to reduce water losses due to evaporation and seepage. Concrete is a water-resistant material that can help to keep water in the canal. This can be a particularly effective method in areas with high evaporation rates.
• Desilting can help to remove sediment from canals, which can reduce the amount of water that is lost due to infiltration. Sediment can clog canals and make it difficult for water to flow through them. Removing sediment can help to improve the flow of water and reduce water losses.
• Reducing seepage can be done by installing linings or by using other methods to reduce the amount of water that flows through the canal bed. Seepage is the flow of water through the canal bed and into the surrounding soil. This can be a significant source of water loss, especially in areas with high water tables. There are a number of ways to reduce seepage, including installing linings, using drainage systems, and reducing the slope of the canal bed.

In conclusion, all of the options listed in the question can be used to reduce water losses in canals. The best method to use will depend on the specific circumstances of the canal.