And hopefully just to do a temporary break in that water so they can start flowing and backflowing that water back into the lake.    From Wordnik.com.  [CNN Transcript Sep 7, 2005] Reference

Discharge tubes will be extended through the walls, and valves and gates will be installed to stop water from backflowing through the pumps, as happened during Hurricane Katrina.    From Wordnik.com.  [New Orleans Saints Central] Reference