1. a system of sewers for carrying away waste water and sewage
2. the process of removing waste water and sewage through sewers

Examples

• The city invested millions in upgrading its sewerage infrastructure.
• Poor sewerage systems can lead to serious health problems.
• The new housing development required extensive sewerage planning.
• Heavy rains overwhelmed the old sewerage network.
• Modern sewerage treatment plants help protect the environment.
• The town’s sewerage system dates back to the 1920s.