What feature may a roof drain installation have to manage rainwater runoff?

A roof drain installation may include a filtration system with sand and oil interceptors to effectively manage rainwater runoff. This feature is critical because it helps remove contaminants from the water before it is directed into the drainage system. Sand interceptors are designed to capture sediment and debris, while oil interceptors are essential for removing hydrocarbons that may accumulate from the roof surface or surrounding areas. By ensuring that contaminants are filtered out, the drainage system can maintain compliance with environmental regulations and protect water quality.

In contrast, while other options like an attached venting system, built-in heating elements, and mechanical pumps might serve specific functions in different plumbing applications, they do not primarily address the needs associated with managing rainwater runoff effectively. Venting systems are focused on air circulation within drainage systems, heating elements typically prevent freezing in specific applications, and mechanical pumps are utilized for moving water but do not inherently filter or treat rainwater runoff.