What is a line being fed by an established, continuous water supply referred to as?

The term for a line being fed by an established, continuous water supply is commonly referred to as an "attack line." An attack line is specifically designed for offensive firefighting operations where firefighters engage in direct combat with an active fire. It is typically connected to a water source that provides a steady flow, allowing firefighters to effectively manage and extinguish the flames.

An attack line has the characteristics of being versatile and easily maneuverable, enabling firefighters to navigate through various environments during a response. It is crucial for the suppression of the fire and for protecting lives and property in emergency situations. Understanding the role of an attack line is essential for firefighters, as it emphasizes the importance of a reliable water supply during firefighting operations.