Question

That portion of a drainage system that does not drain by gravity into the building sewer is known as a?

1) Storm sewer
2) Sanitary sewer
3) Combined sewer
4) Vent pipe

Answer 1

A storm sewer is a portion of a drainage system that does not drain by gravity into the building sewer. It is designed to collect and convey rainwater runoff to prevent flooding.

Step-by-step explanation:

The portion of a drainage system that does not drain by gravity into the building sewer is known as a storm sewer.

A storm sewer is a separate system that is designed to collect and convey rainwater runoff from streets, parking lots, and other surfaces to prevent flooding. It carries stormwater directly to nearby bodies of water, such as rivers or lakes, without the need for treatment.

Unlike a sanitary sewer that carries wastewater from toilets, sinks, and other household drains to a treatment plant, a storm sewer does not handle any sanitary or domestic waste.