A pipe that conveys storm water from the roof to a storm drain is called what?

The term used for a pipe that transports storm water from the roof to a storm drain is "storm leader." This designation is important in plumbing and drainage systems because a storm leader is specifically designed to handle the collection and transfer of rainwater, ensuring that it is efficiently routed away from buildings to prevent water damage and flooding.

Storm leaders are part of a larger storm drainage system, which also includes the storm drains that actually receive the water. Defining this system correctly is essential for proper installation and maintenance, as it distinguishes it from other types of drainage systems. This distinction helps plumbing professionals adhere to building codes and best practices in managing storm water flow.

While terms like "drain leader" or "roof leader" could intuitively seem relevant, they do not accurately capture the specific role that a storm leader plays within the context of storm water drainage, which is critical for effective system operation and regulations in urban environments like New York City.