As the liquid level in a wet well increases, what happens to the flow of a submerged centrifugal pump?

In a submerged centrifugal pump, as the liquid level in the wet well increases, the flow from the pump tends to increase. This is primarily due to the fact that a higher liquid level results in greater pressure at the inlet of the pump, allowing it to move more fluid.

Centrifugal pumps operate by converting the kinetic energy from a rotating impeller into pressure in the fluid being pumped. When the liquid level is higher, the pump has access to more potential energy, allowing it to perform more efficiently. Essentially, the head (the height of the liquid) increases, which helps to overcome friction and other losses within the system, leading to a higher flow rate.

In addition, if the pump is properly sized for the application, increasing liquid levels generally mean that the flow will increase until it reaches the pump's capacity or the system limits. Therefore, the behavior of the flow rate in response to rising liquid levels aligns with the principles of how centrifugal pumps function. The design of the system, including the pump curves and the characteristics of the fluid being pumped, further confirms this increase in flow under higher head conditions.