takaiskuvirta

Takaiskuvirta, often translated as backflow or back-siphonage, is the undesirable reversal of water flow in a plumbing system. This phenomenon occurs when the pressure in the supply piping drops below the pressure in the connected non-potable water system. When this happens, contaminants from the non-potable source can be drawn back into the clean drinking water supply.

Several factors can cause a pressure drop that leads to takaiskuvirta. These include a sudden surge in demand for water, such as when a fire hydrant is opened, or a break in a water main. Leaks in the supply system can also reduce pressure. The presence of devices like submerged inlets or hoses connected to non-potable sources, like garden hoses left in swimming pools or buckets of cleaning solutions, significantly increases the risk.

The consequences of takaiskuvirta can be serious, as it can lead to the contamination of the public drinking water supply with harmful substances like bacteria, chemicals, or heavy metals. This poses a significant public health risk.

To prevent takaiskuvirta, plumbing codes mandate the use of backflow prevention devices. These devices are designed to allow water to flow in only one direction. Common types include vacuum breakers, check valves, and reduced pressure zone (RPZ) assemblies. Regular inspection and maintenance of these devices are crucial to ensure their effectiveness. Public awareness and responsible use of plumbing fixtures, such as avoiding submerged inlets and keeping hoses out of potentially contaminated water, also play a vital role in protecting the water supply.