Which of the following is the purpose of providing catch pits in a sewer system?

To prevent the entry of silt, grit, debris, etc. contained in the rainwater

To provide a connection between the high-level branch sewer to the low-level main sewer

To exclude grease and oil from sewage

To hold and throw water into the sewer

Solution

Correct option is A

Catch basin:- Catch basins are provided to stop the entry of heavy debris present in the storm water into the sewers.
• At the bottom of the basin space is provided for the accumulation of impurities.
• Perforated cover is provided at the top of the basin to admit rain water into the basin.
• A hood is provided to prevent escape of sewer gas