Why is it important for the vent pipe to be above the snowline?

It is important for the vent pipe to be above the snowline primarily to avoid blockages. When vent pipes are situated below the snowline, they become vulnerable to being covered by snow during winter storms. This can lead to a situation where the vent is obstructed, preventing proper airflow and creating pressure imbalances within the plumbing system. Proper ventilation is essential in a plumbing system as it allows sewer gases to escape and maintains the necessary pressure for the drainage system to function effectively. If blockages occur, it can result in backups and potentially hazardous conditions due to the buildup of sewer gases. Therefore, ensuring that vent pipes are positioned above the snowline is a crucial consideration in plumbing design to maintain system functionality and safety.