What does back-siphonage primarily occur due to?

Back-siphonage primarily occurs due to low system pressure. When the pressure in a water supply system drops below the atmospheric pressure, it creates a vacuum effect. This vacuum can cause water from the surrounding environment or an unprotected source, such as a tank or a pool, to be drawn into the potable water supply. This phenomenon can be particularly concerning because it can lead to the contamination of drinking water with harmful substances.

Understanding the mechanics of pressure in water systems is crucial. Efficient backflow prevention measures are essential in areas where the integrity of potable water is at risk from external sources. Low pressure situations can arise from events like heavy water use, main breaks, or fire-fighting activities. These scenarios emphasize the need for appropriate backflow prevention devices to mitigate risks associated with back-siphonage, ensuring the safety and integrity of the public water supply.