What is puddling clay?

Puddling clay is a type of clay that is particularly dense and impermeable. It is obtained by mixing clay with water and working it thoroughly by trampling it or kneading it by hand. Puddling clay is commonly used in the construction industry as a waterproofing material for dams, canals, and embankments. It is also used as a lining for ponds and reservoirs to prevent water leakage. In agriculture, puddling clay is used to improve soil quality by increasing its water-holding capacity and reducing soil erosion. However, overuse of puddling clay in agriculture can lead to soil compaction and reduced fertility. Puddling clay is also a popular material for sculpting and pottery due to its plasticity and ability to hold its shape.