Which material is commonly used for drainage and sewage systems?

PVC, or polyvinyl chloride, is commonly used for drainage and sewage systems because it offers a combination of affordability, versatility, and resistance to corrosion. Its lightweight nature makes it easy to handle and install, which helps reduce labor costs. PVC also has a smooth interior surface that promotes efficient flow of wastewater and minimizes the buildup of materials that can lead to clogs.

Furthermore, PVC pipes are durable and have a long service life, making them an excellent choice for both residential and commercial plumbing applications. They are suitable for a wide range of temperatures and do not degrade when exposed to various chemicals typically found in sewage.

While other materials like copper, polyethylene, and cast iron have their uses in plumbing, they are not as widely favored for drainage and sewage purposes due to factors like cost, weight, or susceptibility to damage. For example, cast iron is heavy and prone to rust, making it less practical for modern installations compared to PVC.