Ground Water
Written by admin on Friday, October 10th, 2008 in Ground Water.
Ground Water
Ground water is the water located under the ground surface such as soil pores and in the ruptures of the litho logic formations. The depth to which the pores of ground or the ruptures and the vacuums in the rock become entirely saturated with water is known as water table. Ground water is reloaded, and runs thereafter of surface naturally; the natural discharge often occurs through the springs and seeps, streams and can form oases or marshes. Ground waters are also often used for the agricultural, municipal use and industrialist use by building and actuating extraction wells. The study of the distribution and the movement of ground water are known as hydrogeology or hydrology of ground water. Pure water has no taste and color. A molecule of water contains only the atoms of hydrogen and of oxygen. Naturally water is never found in a pure state. The ground water contains many components, including gases, micro-organisms, organic and inorganic materials.
The chemical nature of water evolves continuously when it moves through the hydrological cycle. The types of chemical components present in the ground water depend, partly, of the chemistry of the precipitation refill of water. The engineers must consider ground waters before planning any kind of construction almost, above or below the ground. Lack of awareness regarding the ground waters on the slope stability can be expensive and hazardous. The geologists views ground waters as a significant force in the geological change. The pressures caused by the liquid exerted by Ground waters, for example, play an important part in the occurrence of the earthquakes. The geologists also know that the movement of underground water due to geological formations prevents the migration and the accumulation of oil and the formation of some ore layers.
Ground waters are not confined only with some channels or depressions in the same way that the surface water is concentrated in the streams and the lakes. Rather, they exist almost everywhere under ground. The underground water is found in spaces between the particles of the rock and the ground, or in splits and cracks in the rock. Usually water filling in these openings is with less than 100 meters of surface. Most of fresh water of the ground is found in these spaces. At greater depths, because of the weight of the overlying rock, these openings are much smaller, and thus hold only smaller the quantities of water.
The study of Ground waters is essential for the engineers who build tunnels, water transport channels, mines, and other structures. Ground waters must be considered all the times as the stability of the slopes is important, whether the slope is natural or constructed. Ground waters must also be taken into account when taking actions to prevent the flood. In majority of these situations, the flow of ground waters and the pressure of the liquid can create geo technical problems. Water market which depends entirely on ground water is a profitable business which extends from the private suppliers selling water, the water tankers and the large companies producing bottled waters. This surplus extraction quickly exhausts the water tables as well as the quality of water gets deteriorated in majority of the cities.
The sea water is denser than fresh water. The fresh water which “floats” above deeper sea water in a kind of balance gets affected because of disturbed pumping. The change in pressure due to pumping also causes coning where the sea water starts to mix with the fresh water table. Water becomes brackish, affecting a vast area. The Ground water pollution caused by human activities usually classified into two categories namely point-source pollution and nonpoint-source pollution. The pollution of Point-source refers to the contamination occurring from a single tank, disposal etc. The discharges of industrial wastes, leakage of storage tanks of gasoline, and the discharges or the embankments are other such examples of the point sources pollution. Chemicals used in agriculture such as manures, pesticides, and weed killers are examples of pollution of nonpoint-source because they are wide through broad sectors.
Since substances of nonpoint-source are employed above great sectors, they collectively can have a greater impact on the general quality of water in an aquifer than to direct the sources, in particular when these chemicals are employed in the sectors which cover the aquifers which are vulnerable to pollution. If the impacts from specific pollution sources such as the septic field drain system which occurs over the great sectors, they often are collectively treated as nonpoint source of pollution. Many factories deliberately inject the untreated effluents directly in to the ground, polluting the underground aquifers.