Canal lining is the process of reducing seepage loss of irrigation water by adding an impermeable layer to the edges of the trench. Seepage can result in losses of 30 to 50 percent of irrigation water from canals, so adding lining can make irrigation systems more efficient. Canal linings are also used to prevent weed growth, which can spread throughout an irrigation system and reduce water flow. Lining a canal can also prevent waterlogging around low-lying areas of the canal.[1]
By making a canal less permeable, the water velocity increases resulting in a greater overall discharge. Increased velocity also reduces the amount of evaporation and silting that occurs, making the canal more efficient.[1] The oldest known paved canal was discovered in 1995 near the pyramids of Giza, and is estimated to be around 4,500 years old.[2]
- ^ a b Basak (1999-10-01). Irrigation Engineering. Tata McGraw-Hill Education. ISBN 9780074635384.
- ^ "Oldest Paved Canal Uncovered In Egypt". tribunedigital-chicagotribune. Retrieved 2016-03-30.