What is defined as an air gap?

An air gap is defined as a complete separation of the water supply and the receiving vessel, ensuring that there is no direct connection between the two. This design principle is vital in preventing contamination of the water supply, as it physically separates the drinking water from any potential sources of pollutants or contaminants.

By maintaining this gap, it allows air to escape and prevents backflow from occurring, effectively safeguarding the water supply system. This is especially important in irrigation systems, where there is a risk of fertilizers, chemicals, or wastewater entering the potable water supply through backflow if a direct connection exists.

While other definitions, such as a physical separation between water sources, might seem related, they do not capture the critical function of maintaining an air gap in preventing backflow specifically. The role of an air gap as a protective barrier against contamination solidifies why this definition is the most accurate and relevant in the context of water safety and irrigation practices.