Flood embankment Flood embankment A flood embankment is traditionally an earth wall used to shore up flood waters. Most flood embankments are between 1 metre and 3 metres high. A 5 metre high flood embankment is rare. Modern improvements to this design include constructing an internal central core made from impermeable substance like clay or concrete, some even use metal pilings. Some authorities call man-made structures levees. Clifton, Rawcliffe, Poppleton and Leeman ings in York River Gowan, Cumbria River Trent This is an animation showing a flood event overwhelming neighbouring properties and the added construction of a flood embankment and flood warning
Perennial water specifically include those that only are perennial except in years of severe or unusual drought. Perennial standing (lentic) water is usually called a lake or a pond, but there are several local or dialect English words for such features. Examples include mere, tarn, loch or fen. Each has a special meaning, though modern usage tends to be loose. Vlei is a foreign example that may or may not mean a perennial body of water, but more often than not refers to a seasonal pond. Perennial water Perennial water body usually refers to mainly liquid fresh water, as opposed to sea