The rivers always flow from the mountain, but not uphill. Any water which flows down from the mountain turns into the river, a stream or the lake. The source of the rivers and streams always is above the place of their confluence with the sea or other reservoir. Therefore in the nature water uphill the leak cannot.
Nevertheless under certain conditions a small amount of water can rise up that contradicts the law of an attraction. This phenomenon in physics is called capillary effect. That it occurred, it is necessary that water was put into a narrow opening on similarity of a tube or thin channel. Xylems in fabrics of plants are an example of that. Thus plants extract water from under the earth and lift it up. Other example – the paper absorbing towels which work by the principle of capillaries, and tubules for cocktail.
If the tube too wide, capillary effect does not occur. That force of an attraction of hydrogen communications in water of the river or a stream could overcome attraction force, an important condition is a certain radius of an opening.
In physics there is an equation on which it is possible to calculate, the water column as a result of capillary effect how highly can rise.
The tube or a channel are wider, the level of the risen water will be that below. At a certain height force of an attraction of Earth will overcome force of an attraction of molecules in a tube.
The famous scientist Albert Einstein devoted the first work to the phenomenon of capillary effect in 1900. Work was published in the German magazine under the name "Annals by Physics" a year later.
It is obvious that the reservoir of the size of the river or a stream will be subject to forces of an attraction, inertia and other laws of physics and will be forced to flow from the mountain.
Ancient Romans managed to force water flow uphill. That water began to flow up, they resorted to technology of the turned siphon. All aqueducts carried out water from the source which is at a certain height to consumers who usually settled down below. If the valley occurred in the path of water, Romans built over a landscape an arch at the raised level. Generally these tunnels were under construction at an angle, directing water down. But sometimes they rose by means of the turned siphon. Such technology demands that the tunnel was closed well up and was rather strong to sustain water pressure in a siphon. It is necessary to notice, even despite the raised tube corner, water flowed from it one level below than that place from where its other end began. Therefore technically it is impossible to tell that Romans started up water up a grief.
Other ways of a raising of water
In the modern world in order that water rose up, pumps are used. If to address examples from the past, then in certain cases people resorted to the help of a water wheel. If the water wheel is in quickly current stream, then there will be enough energy to raise a small amount of water. But for large volumes of water this method does not work. It is similarly possible to use the Archimedean screw to create the water flow flowing up at small distance, for example, in the systems of an irrigation.
The Archimedean screw is the device consisting of a screw spiral in an empty tube. The device works due to rotation of a spiral by means of a windmill or manual work.
But this method also does not work for a large amount of water.