Why is the water seal the most important element of the drainage system?

Water seal drainage system is a closed chest drainage system used to allow air and fluid to escape from the pleural space with each exhalation. Drainage systems are placed to remove the excess water in building development.

There are also drainage systems that are put in place to eradicate wastewater effectively, and this is referred to as a sewer system — not having the proper drainage system in place will result in flooding. An adequate drainage system removes all excess water without flooding.