Backflow in a construction context is the flow of water in the opposite direction than intended, typically caused by a decrease in pressure in the supply system. This can occur when water is drawn from a source such as a lake or river, and pressure is lost in the pipes due to a large demand for water. In this situation, water can flow back into the supply source, thus contaminating it. Backflow prevention devices are installed to prevent this from happening.
Also, Backflow is a situation in a plumbing system where water flows in the opposite direction it is intended to flow. It is caused by a pressure differential between the water supply and the drain, which can be caused by a break in the main water supply, a faulty valve, or a blocked drain.
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