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A diligent plumber will also calculate the pressure loss from the height of the bathroom above the water meter, the pressure loss through the water meter, a backflow preventer and any other pressure regulators.

They might also trigger backflow valve inspection requirements, such as those required for irrigation systems in many areas.

Götherström agrees that repeated backflow is the most likely scenario given the available evidence.

She has bricks to stand heavy furniture on if there is a flood warning, as well as freestanding pumps and sandbag substitutes ready, and even a toilet bung to prevent backflow.

Arlington's drinking water supply was not affected, and that the splash pad is equipped with a backflow prevention device designed to isolate its water from the city's water distribution system.