Which device helps prevent backflow in irrigation systems?

The correct choice relates to the Anti-Siphon Device, which is specifically designed to prevent backflow in irrigation systems. Backflow can occur when there is a drop in water pressure, allowing potentially contaminated water from the irrigation system to flow back into the main water supply. The Anti-Siphon Device creates a physical barrier that prevents this reverse flow. It typically works by maintaining a certain height above the water source, which helps to ensure that water can only flow in one direction—from the water supply to the irrigation system.

In irrigation systems, maintaining water quality is critical, and devices like the Anti-Siphon Device directly address this concern by ensuring that any contaminants are not allowed to enter the potable water supply. While other devices, such as a Backflow Preventer, also serve this purpose effectively, the Anti-Siphon Device is distinguished by its design and specific application within the context of maintaining proper flow direction in irrigation systems.

Devices such as Pressure Relief Valves and Flow Meters serve different purposes in irrigation systems, such as regulating pressure and measuring water flow, respectively, but they do not directly prevent backflow.