What type of lines are directly connected to sprinkler heads?

Branch lines are the correct answer because these are the lines that specifically connect individual sprinkler heads to the rest of the sprinkler system. They serve the purpose of delivering water directly to each sprinkler head, ensuring that the areas needing irrigation receive the appropriate amount of water.

To understand this better, consider the hierarchy of a sprinkler system. Supply mains generally carry water from a source, such as a water supply or a pump, to various parts of the system. Feeder lines typically connect the supply mains to the branch lines, delivering water throughout the system. Risers, on the other hand, are vertical components that help transport water from the ground level up to other levels in buildings or landscapes.

By distinguishing these components, it becomes clear that branch lines are the key connection points right at the sprinkler heads, making them indispensable for effective water distribution in any sprinkler system.