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The side of a levee in Sacramento, California. A levee (/ ˈ l ɛ v i / or / ˈ l ɛ v eɪ /), [a] [1] dike (American English), dyke (British English; see spelling differences), embankment, floodbank, or stop bank is an elevated ridge, natural or artificial, alongside the banks of a river, often intended to protect against flooding of the area adjoining the river.
Embankment (earthworks), a raised bank to carry a road, railway, or canal across a low-lying or wet area Embankment dam , a dam made of mounded earth and rock Land reclamation along river banks , usually marked by roads and walkways running along it, parallel to the river, as in:
Most flood embankments are between 1 metre and 3 metres high. A 5-metre-high (16 ft) flood embankment is rare. [1] Modern improvements to this design include constructing an internal central core made from impermeable substance like clay or concrete, some even use metal pilings. [2] Some authorities call man-made structures levees.
By placing these embankments somewhat back from the margin of the river-bed, a wide flood-channel is provided for the discharge of the river as soon as it overflows its banks, while leaving the natural channel unaltered for the ordinary flow. Low embankments may be sufficient where only exceptional summer floods have to be excluded from meadows.
Even a small sustained overtopping flow can remove thousands of tons of overburden soil from the mass of the dam within hours. The removal of this mass unbalances the forces that stabilize the dam against its reservoir as the mass of water still impounded behind the dam presses against the lightened mass of the embankment, made lighter by ...
The natural slope of the flood plains is often very small, and little fall (or head loss) is permissible in the culverts. Researchers developed and patented the design procedure of minimum energy loss culverts which yield small afflux. [21] [22] [23] A minimum energy loss culvert or waterway is a structure designed with the concept of minimum ...
Yu’s proposal is this: Create areas with porous earth where local plants can thrive with little or no maintenance. If it rains, the earth and plants soak up the water and prevent some (or even ...
An artistic impression of a tidal barrage, including embankments, a ship lock, and caissons housing a sluice and two turbines. The barrage method of extracting tidal energy involves building a barrage across a bay or river that is subject to tidal flow. Turbines installed in the barrage wall generate power as water flows in and out of the ...