Fluid flow in the borehole from one zone into another in response to pressure differences between the zones. Any time the wellbore pressure rises above the average pressure in any zone, backflow will [..]

Movement of water (or other liquid) in any direction other than that intended.

In hydrologic terms, the backing up of water through a conduit or channel in the direction opposite to normal flow.

– The unwanted reverse flow of liquids in a piping system.

The flow of water in a medium in a direction opposite to normal flow. Flow is often returned into the system by backflow, if the wastewater in a purification system is severely contaminated.

The flow of liquids through irrigation into the pipes of a potable or drinking water supply from any source which is opposite to the intended direction of flow.

(n) a flow that returns toward its source

Flow upstream, that is in a direction contrary to the intended normal direction of flow, within or from a water fitting. Interpretation given in Schedule 2: of the Water Supply (Water Fittings) Regula [..]

A reverse flow condition, created by a difference in water pressures, which causes water to flow back into the distribution pipes of a potable water supply from any source or sources other than an int [..]

 The backing up of water through a pipe in the direction opposite to normal flow.

A reverse flow condition, created by a difference in water pressures, which causes water to flow back into the distribution pipes of a potable water supply from any source or sources other than an int [..]

A reverse flow condition, created by a difference in water pressures, that causes water to flow back into the distribution pipes of a potable water supply from any source or sources other than an inte [..]

Flow of water in a pipe or line in a direction opposite to normal flow; often associated with back siphonage or the flow of possibly contaminated water into a potable water system.

The backing up of water through a conduit or channel in the direction opposite to normal flow.

In hydrologic terms, the backing up of water through a conduit or channel in the direction opposite to normal flow.

The flow of water or other liquids, mixtures, or substances into the distributing pipes of a water supply from a source or sources other than intended. Back-siphonage is one type of backflow.

A flow of a liquid opposite to the usual or desired direction.

During well testing, fluid may flow from one zone to another due to the wellbore’s pressure rising higher than other zone pressures.

movement of water back to source e.g. contaminated water in a plumbing system.

In hydrologic terms, the backing up of water through a conduit or channel in the direction opposite to normal flow.