What is the requirement for the minimum size of a sanitary sewer pipe as per the code?

The requirement for the minimum size of a sanitary sewer pipe, as outlined in the National Plumbing Code of Canada, is 100 mm (4 inches) in diameter. This size is deemed necessary to effectively handle the expected flow of wastewater from typical residential and commercial applications while ensuring proper drainage and minimizing the risk of blockages.

Using a pipe that is 100 mm in diameter helps to accommodate the average household wastewater output, which includes sewage, greywater, and stormwater. This minimum size helps to ensure the system operates efficiently, allowing for safe and effective transport of waste to treatment plants without excessive buildup or overflow.

Other options provide dimensions that are either too small to effectively manage the flows typically expected in sanitary systems or are not aligned with the code’s minimum requirements. A smaller diameter could lead to increased chances of clogging and inadequate drainage, which can have significant implications for public health and sanitation. Therefore, a diameter of 100 mm is necessary for reliable performance in a sanitary sewer system.