What is the term for a vertical supply pipe leading to an elevated tank?

The term for a vertical supply pipe leading to an elevated tank is commonly referred to as a "riser." In the context of water distribution systems, a riser is specifically designed to transport water vertically, often from ground-level piping up to a tank situated at a height. Elevated tanks require this vertical pipe to effectively supply water through gravitational flow to the distribution system below.

While "pipe riser" is a similar term, it can sometimes refer to a broader category that may include various configurations or purposes, not solely focusing on the supply aspect to elevated tanks. The term "supply line" typically refers to any pipe that carries water from one point to another, which may not necessarily be vertical. "Distribution pipe" generally indicates pipes that distribute water within a network after it has left an elevated storage point, therefore not describing the vertical transport directly.

Recognizing "riser" as the correct answer helps reinforce the understanding of functionally specialized terminology in water distribution systems, particularly in relation to how water is moved and stored in elevated tanks.