Keeping wastewater moving in a sewer helps prevent septic conditions and line blockages.

• A. septic conditions and line blockages
• B. odors only
• C. corrosion only
• D. backflow only

Answer: (A)

Keeping wastewater moving in a sewer relies on keeping solids in suspension and preventing them from settling to the pipe bottom. When flow slows or stops, solids settle, form deposits, and create blockages, while the low-velocity, stagnant environment promotes anaerobic (septic) conditions that generate odors and corrosive gases. By maintaining movement, you reduce both the buildup that leads to blockages and the conditions that foster septic-type decomposition, making it the most comprehensive description of the benefit. The other options focus on a single issue (odors, corrosion, or backflow) and don’t capture the full advantage of keeping flow up.