Rhode Island Journeyman Plumber Practice Exam

What type of drain conveys storm water from the roof to the sewer system?

1. A roof drain

2. A sanitary sewer

3. A combined sewer

4. An underground trench

The correct answer is: A roof drain

A roof drain is designed specifically to collect and channel storm water runoff from the roof of a structure. The primary function of a roof drain is to prevent water accumulation on the roof, which could lead to potential structural damage or leaks. Once the rainwater is collected, it is directed through a piping system, eventually leading to the sewer system or a stormwater management system. This type of drain is essential in managing stormwater effectively, separating it from other types of wastewater that go into the sanitary sewer. Understanding the role of a roof drain is crucial for plumbing professionals, as it ensures that systems are designed and installed correctly to handle rainwater efficiently and reduce the risk of flooding or water damage to buildings. In contrast, options such as a sanitary sewer or a combined sewer typically deal with wastewater from plumbing fixtures and household activities rather than storm water. An underground trench might sometimes be used for drainage purposes, but it is not specifically designed as a conduit for storm water from roofs. Each option has a distinct function, but the roof drain uniquely serves the purpose articulated in the question.