What is the minimum vertical extension required for a water line to be classified as a riser?

The classification of a water line as a riser is determined by its vertical extension. A riser typically refers to a pipe that distributes water vertically in a building, connecting different levels. To be classified as a riser, the minimum vertical extension needs to be significant enough to effectively serve its purpose, which is why one full storey or more is required.

In practical terms, this designation ensures that the riser can adequately transport water to various points in a building that are one storey high or higher, enabling proper water pressure and distribution. A riser that is less than one full storey may not provide sufficient elevation or pressure for effective water delivery.

Other options suggest varying heights that do not meet the standard definition used in plumbing codes, making them insufficient in establishing a water line as a riser.