How Sump Pumps Clear Subway Floods

The video explains how pumps are used to clear water from subways during floods. When water pressure reaches a certain level, sump pumps activate, and their impellers push water to the surface. This water is then directed towards storm drains and wastewater treatment facilities.

What happens to the water after it is pushed to ground level by the impellers?

Where does the water go after it moves toward storm drains?