Canal lining

Canal lining is the process of reducing seepage loss of irrigation water by adding an impermeable layer to the edges of the trench.

Canal linings are also used to prevent weed growth, which can spread throughout an irrigation system and reduce water flow.

[3] Prior to constructing concrete linings, it is common practice to ensure the sub-grade layer of soil is adequately consolidated.

In order to prevent cracking during the curing process, water is sprinkled on the concrete or a damp cover is placed over the lining.

[3] Compacted clay is a simple form of soil canal lining, which serves as a relatively cheap alternative to other methods.

[5] Low-density polyethylene (LDPE) film, similar to the material used in trash bags, is a common type of plastic membrane used.

Expansive soils, such as certain types of clay, may swell as a result of canal discharge, changing climates or transpiration.

[7] Dispersive soils, such as fine graded sands, can also pose a threat to concrete canal linings since they erode when in contact with flowing water, which can cause piping.