Q1: The sewerage system consists of

ANS:E - all of these.

The sewerage system consists of various components that work together to collect and convey wastewater from individual buildings to treatment facilities or disposal points. These components include:

1. House sewer: The house sewer, also known as the building sewer or service lateral, is the pipe that connects an individual building's plumbing system to the public sewer system or private sewage disposal system. It typically extends from the building's foundation to the property line or to a point where it connects to a lateral sewer.
2. Lateral sewer: The lateral sewer, also known as the collector sewer or collector main, is a larger pipe that collects wastewater from multiple house sewers and conveys it to a branch sewer or main sewer. Lateral sewers are typically located within streets or easements and serve as intermediate conduits for transporting wastewater from individual buildings to larger sewer lines.
3. Branch sewer: Branch sewers are intermediate-sized pipes that receive wastewater from multiple lateral sewers and convey it to larger main sewers or trunk sewers. Branch sewers help distribute wastewater flow and connect smaller sewer lines to larger conveyance systems.
4. Main sewer: Main sewers, also known as trunk sewers or interceptors, are the largest pipes in the sewerage system and serve as primary conduits for transporting wastewater from multiple branch sewers to treatment facilities or disposal points. Main sewers are typically located along major streets or within dedicated sewer corridors and are responsible for conveying large volumes of wastewater over longer distances.

Therefore, the correct answer is: all of these.