What is the primary function of a master valve in an irrigation system?

The primary function of a master valve in an irrigation system is to activate the master valve when any zone is running. This valve serves as a crucial component that helps manage water flow throughout the system effectively. When a zone valve opens to irrigate a specific area, the master valve responds by opening as well, allowing water to flow from the source into the main irrigation lines. This ensures that the system operates efficiently and prevents water from being wasted while zones are not in use.

This design helps in several ways: it adds a level of control over the entire system, can prevent backflow or unwanted water flow when zones are not in operation, and can enhance safety by ensuring the water only flows when needed. Therefore, the activation of the master valve when any zone operates is fundamental to the overall functionality of the irrigation system.

Other choices refer to different functions or controls within the irrigation system. For instance, regulating water pressure and controlling flow rates deal with different aspects of water management, while distributing water evenly pertains to the efficiency of individual zones rather than the overarching control mechanism that the master valve provides.