Which type of sewer is designed to carry sewage while excluding storm and surface water?

The correct answer is Sanitary Sewer. A sanitary sewer is specifically designed to transport wastewater, which includes sewage from households, commercial establishments, and industrial sources. The primary function of a sanitary sewer is to carry this sewage to treatment facilities while keeping it separate from stormwater and surface water.

This separation is crucial because it helps prevent the overloading of wastewater treatment plants during heavy rain events, which can occur if stormwater is allowed into the sanitary sewer system. The design of sanitary sewers ensures that they handle only domestic and industrial effluents, aiming to maintain the integrity and efficiency of sewage treatment processes.

Other types of sewers, such as combined sewers, are designed to handle both sewage and stormwater, which can lead to issues related to runoff during rainstorms. Storm sewers are intended specifically for the drainage of rainwater and surface runoff, while the term "wastewater sewer" is not a standard term used in plumbing codes and does not provide clear context in this scenario. Thus, understanding the function and purpose of a sanitary sewer is essential for proper plumbing and wastewater management.