embankment; levee; bank; weir
A raised structure built along a river, coast, or other water body to prevent flooding or erosion. 堤防 is the general term; 堰 (せき) is a weir/dam for controlling water flow, not a flood-prevention embankment.
The river embankment collapsed due to heavy rain.
A long levee has been built along the coast.
The river's levee breached due to heavy rain.
The water level rose over the levee and flooded the surrounding area.
There is a risk that the aging levee will collapse.
They reinforced the levee in preparation for the typhoon.