Which of the following scenarios is an example of backsiphonage?

In the context of backsiphonage, the correct scenario involves a situation where there is a potential reversal of flow in a water supply system due to a drop in pressure. In option B, the garden hose submerged in a dirty bucket creates a high-risk scenario for backsiphonage. If the pressure in the public water supply drops (for example, due to a water main break or significant demand), water could flow backward through the hose into the potable water source, drawing contaminants from the dirty bucket into the clean water supply.

Backsiphonage occurs specifically when there is negative pressure created in a drinking water system, leading to the unsanitary water being siphoned back into the system. The setup described in option B illustrates this risk, as the dirty water can easily be pulled into the clean water pipeline when the pressure changes.

In contrast, the other scenarios relate to potential cross-connections or system faults that may not directly illustrate the concept of backsiphonage adequately. For instance, although a fire sprinkler system with pressure greater than the public supply might create cross-contamination risks, it doesn’t represent backsiphonage unless there’s a pressure drop influencing the flow direction. A faulty pressure reducing valve may cause fluctuations but does not specifically