The RAT Pack - Using sound to find clogged sewer pipes

Lee Liller from the city of Rockville introduces the SL-RAT, a device used to assess sewer main blockages using sound waves. The video demonstrates the operation of the SL-RAT, explaining how it provides readings from 0 to 10 to indicate the level of blockage. A reading of 6 to 10 suggests a clear pipe, while 0 to 5 indicates a blockage. The SL-RAT is more efficient than previous methods, allowing coverage of 6,000 feet compared to 1,500 feet with a camera truck. The video concludes with appreciation for the audience's attention.

What is the primary function of the SL-RAT device?

• To monitor water quality in the sewer system

• To repair damaged sewer pipes

• To send sound waves through sewer mains to assess blockages

• To clean the sewer pipes

How does the SL-RAT determine if a sewer pipe is clear?

• By detecting odors in the sewer

• By using a camera to visually inspect the pipe

• By measuring water flow

• By sending sound waves and analyzing the bounce-back

What does a reading of 7 indicate about the sewer pipe?

• The pipe is partially blocked

• The pipe is completely blocked

• The pipe is mostly clear

• The pipe is leaking

Before the SL-RAT, what method was primarily used to inspect the sewer pipes?

• Pressure testing

• Manual inspection

• Chemical testing

• Camera truck

How much more area can the SL-RAT cover compared to the camera truck in a day?

• Five times as much

• Four times as much

• Three times as much

• Twice as much