How can water backflow into a home from something like a garden hose when the supply line into the house has constant positive pressure, and the hose is open ended?

Question

How can water backflow into a home from something like a garden hose when the supply line into the house has constant positive pressure, and the hose is open ended?

In: 2

Answer 1

If there is a sudden change in pressure in the water supply line, this can cause water to backflow into the home. This could happen if there is a break in the line or if someone turns on a faucet elsewhere in the house, for example. If the hose is open ended, then this also creates a path for water to flow back into the house.