What is the term for water rushing out of a harbor as the tide trough approaches?

The term for water rushing out of a harbor as the tide trough approaches is known as an ebb current. This phenomenon occurs as the tide begins to recede, causing the water level in the harbor to lower and the water to flow out toward the open sea. Ebb currents are typically strongest just after high tide when water levels begin to drop, resulting in a significant and noticeable movement of water away from the shore.

Flood currents, on the other hand, refer to the incoming water flow as the tide rises, leading to an influx of water into bays and harbors. Slack water represents a period of little to no current that occurs between the flood and ebb currents, often during the transition between high and low tides. Tidal range refers to the difference in height between high tide and low tide, which doesn't specifically relate to the flow of water out of a harbor.