What is referred to as the reverse flow of water resulting from a reduction in water pressure?

The term that describes the reverse flow of water due to a reduction in pressure is known as back-siphoning. This phenomenon occurs when the pressure in a water supply system drops, causing water from a source—such as a contaminated area or a storage tank—to flow backward into the potable water supply. Understanding back-siphoning is critical for managing water quality and preventing contamination of drinking water supplies, as it highlights the importance of maintaining proper pressure in water systems and the necessity of backflow prevention devices.

In contrast, filtration refers to the process of removing particles or contaminants from water using porous materials. Leaching describes the process by which nutrients or contaminants are washed away from soil or material through water movement. Drainage pertains to the removal of excess water from an area, often involving the flow of water through pipes or channels. While these terms are related to water management and quality, they do not specifically denote the reverse flow caused by pressure reduction as back-siphoning does.