When the gates are down, pumps will push rainwater back out into Lake Pontchartrain.
A pump pushes the heat transfer liquid (often just treated water) through the panel.
A third pumps an air bag, pushing oxygen into her lungs.
An electric pump, often placed under the water, pushes the water through the pipes.
The water is routed to a sump, where a pump pushes it out of the basement.
The power is injected when the pump pushes the water "forwards" to go around the loop again.
The pump pushes the water through a filter that removes dirt, hair, pollen and other small particles.
These pumps push hydraulic fluid into several accumulators.
The pump pushed about 4,000 gallons of water a minute.
Electrical pumps push air into an underground cavern at pressures up to 1,078 pounds per square inch, or more than 70 times ordinary atmospheric pressure.
