The act of submerging, or the state of being submerged; submersion.

The distance the ejector, foot valve or submersible pump is installed below the pumping level

The vertical distance between pumping level and the bottom of the pump or jet assembly. Submergence must be sufficient to insure that the suction opening of the pump or jet assembly is always covered with water, while maintaining enough clearance from the bottom of the well to keep it out of sediment (at least 10 feet clearance is recommended).

The ratio of the downstream total head (measured head plus velocity head) to the upstream total head over a weir.

sinking until covered completely with water

Process by which coastlines become covered with water from rising sea-levels.