A continuous positive pressure in a distribution system is essential for preventing what event?

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Multiple Choice

A continuous positive pressure in a distribution system is essential for preventing what event?

Explanation:
Maintaining continuous positive pressure in a distribution system creates a barrier that keeps water flowing outward, not backward. With the system pressure above ambient, reverse flow through cross-connections cannot occur, so a backflow event is prevented. While backflow can happen via mechanisms like backpressure or siphonage, the essential outcome avoided is the backward flow into the distribution, which helps prevent contamination.

Maintaining continuous positive pressure in a distribution system creates a barrier that keeps water flowing outward, not backward. With the system pressure above ambient, reverse flow through cross-connections cannot occur, so a backflow event is prevented. While backflow can happen via mechanisms like backpressure or siphonage, the essential outcome avoided is the backward flow into the distribution, which helps prevent contamination.

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