After a sewer blockage has been cleared, the sewer should be?

• A. Cleaned to restore to full capacity
• B. Dye test to determine flow rate
• C. Allow to restore to its normal flow
• D. Checked for infiltration and exfiltration

Answer: (A)

After a blockage is cleared, the main goal is to restore the sewer’s ability to carry the design flow. Cleaning and flushing the line removes any remaining debris, grease, or sediment that could quickly cause another blockage. This step reopens the full flow path and helps ensure reliable operation, reducing the chance of immediate re-blockages and confirming the sewer is truly ready to handle normal wastewater volumes.

Dye testing to determine flow rate isn’t the appropriate step here; dye tests are used to trace flows or identify leaks and cross-connections, not to restore capacity. Simply letting the sewer return to its normal flow without cleaning could leave residues that promote another blockage. Checking for infiltration and exfiltration is important for locating leaks and groundwater intrusion, but it’s a separate concern from restoring full capacity right after blockage clearance.