For building storm drains that require a manhole, the manhole must be how far or less from the building?

The requirement for the distance of a manhole from a building, which is specified as 15 feet or less, is established to ensure proper access for maintenance and to minimize the risk of backflow or contamination from storm drains into the building's drainage system. A manhole located too far away could hinder access for necessary inspections and repairs, making it inefficient and potentially leading to future issues related to drainage. Moreover, keeping the manhole close to the building helps ensure that stormwater can be effectively managed and directed away from the building structure, protecting against water damage and maintaining the integrity of the foundation. This requirement aligns with best practices in plumbing and stormwater management, emphasizing safety and efficiency.