The use of high velocity of water to clean a sewer is referred to as?

• A. Mechanical
• B. Velocity
• C. Hydraulic
• D. Pressure

Answer: (C)

High-velocity water used to clean a sewer is described as hydraulic cleaning. This term comes from fluid dynamics and refers to using the energy of moving water to scour and flush out debris from the pipe. The method relies on the force and flow of water to dislodge grease, sediment, and roots, pushing them toward the sewer outlet. It’s different from mechanical cleaning, which uses physical tools to scrape or cut deposits, and from merely thinking in terms of velocity or pressure alone. Jetting, a common hydraulic cleaning method, directs a high-speed water jet to scour the pipe walls. So the concept labeled here is hydraulic.