What is a common feature of both gravity and jet-assisted dumps in water supply systems?

The correct answer highlights that both gravity and jet-assisted dumps in water supply systems are specifically designed to improve water flow.

In gravity dumps, water is released through a gravity-fed system which relies on the natural force of gravity to facilitate the flow of water from a higher elevation to a lower elevation. This method is efficient for transferring large volumes of water quickly, particularly in firefighting scenarios, as it requires a minimal amount of mechanical assistance.

Jet-assisted dumps, on the other hand, utilize a jet pump mechanism that helps to increase the flow of water by creating a low-pressure zone, which allows water to be drawn in and propelled effectively. This ensures that even in situations where natural gravity flow may not be sufficient, the use of jet assistance can enhance the water delivery performance.

Both systems share the common goal of optimizing water movement, hence their purpose in water supply applications is fundamentally aligned. This focus on improving flow distinguishes them from other options provided, which do not encompass the central functional characteristic of both gravity and jet-assisted dumps.