Where roof drains are required, overflow drains must be ___________________________.

Overflow drains are critical in roof drainage systems as they provide an essential backup to ensure water does not accumulate and potentially damage the roof or building structure. According to plumbing codes, overflow drains should be designed to handle excess water that may not be properly channeled through the primary roof drains.

When the overflow drains are required to be the same size as the primary roof drains, it ensures that they can handle the same volume of water and effectively manage any overflow that occurs during heavy rainfall or other situations where the primary drains might become overwhelmed. This uniform sizing is crucial for maintaining optimal drainage performance and reducing the risk of flooding, thereby protecting the integrity of the roofing system and the building itself.

In many plumbing codes, including the Omaha Plumbing Code, the specific requirements for sizing overflow drains are established to promote safety and reliability in building drainage systems. Thus, having the overflow drains be the same size helps ensure a structurally sound and compliant system.