flood plainflood plain
a plain that borders a river, formed from sediment deposited by floods
also written flood′plain·
(plural flood plains)
- Alternative spelling of floodplain.
- On the south side, above the Xingu, a line of low bluffs extends, in a series of gentle curves with hardly any breaks nearly to Santarem, but a considerable distance inland, bordering the flood-plain, which is many miles wide.
- Much high and dry "made" land has been reclaimed from the river flood-plain.
- The valley floor of the North Platte in the foot-hills, the flood-plain of an older river, is in places 700 ft or more below the bounding tableland, and 10 to 15 m.
- In the rainy season it inundates the country throughout its course to the extent of several hundred thousand square miles, covering the flood-plain, called vargem.
- Nearly all of this vast flood-plain lies below the level of high water in the Mississippi, and, but for the protection afforded by the levees, every considerable rise of its waters would inundate vast areas of fertile and cultivated land.