Groundwater

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Advantages of groundwater

http://wiki.answers.com/Q/What_are_the_advantages_of_ground_water

actually Ground Water is free from Pathogenic bacteria(which cause diseases). it does not involve the suspended particles, which make the water turbid, unlike surface water of river or stream which contain a lot of particles in it. Ground Water requires nearly no treatment for its usage. while surface water requires many process like sedimentation, filtration, disinfection etc. ground water are usually hard i.e it cotains in it calicium ions (and some other Di and Tri valent inos which cause hardness of water) hence ground water provide us an small beneficial amount of calcium. but this water is not good for boilers of industries as this may form a calcium layer(called as scaling) within the boiler and it may brust. although gronud water is good but it may contain a a lot of dissolved solids and metals in it (usually in industrial areas) which may be harmful.

Difference of groundwater and surface water

http://www.freedrinkingwater.com/water_quality/quality2/j-1-08-differences-ground-n-surface-water-quality.htm

As you could probably guess, there are some obvious differences in surface water and groundwater quality. But there are more differences than you might have been aware of. Each source of water has a unique set of contaminants; groundwater stores pesticide chemicals and nitrate while surface water contains most bacteria and other microorganisms. Because of the interconnectedness of groundwater and surface water, these contaminants may be shared between the two sources. Neither water source can ever be entirely free from water contaminants. Groundwater supplies in aquifers below the surface of the Earth are among the nation's most important natural resources. Ground water is the source of about 40% of the water used for public supply. It provides drinking water for more than 97% of the rural population who do not have access to public water-supply systems. Even some major cities, such as San Antonio, Texas, rely solely on ground water for all their needs. Between 30 and 40 % of the water used for agriculture comes from ground water. Withdrawals of ground water are expected to rise in the coming century as the population increases and available sites for surface reservoirs become more limited. Now that you know what groundwater is you're probably wondering what surface water is. And if you guessed it has something to do with above ground ...you're easily correct. Surface water can be found over the land surface in streams, ponds, marshes, lakes or other fresh (not salty) sources. Other than the location, one of the primary differences between surface and ground water is that ground water moves much slower than surface water. This is because ground water experiences far more friction as it moves through the pores in soil then surface water experiences as it flows over the earth's surface. Surface-water can be affected by numerous physical variables such as topography, land cover, soil conditions, mineralogy, and ground-water conditions, all of which may be affected by geologic conditions. Surface water is also more easily contaminated than ground water. Filtration through the soil helps clean ground water. The hydrologic cycle interconnects ground and surface water which means they can contaminate one another. A better understanding of how they are interconnected will be explained. As rain or snow falls to the earth’s surface, some water runs off the land to rivers, lakes, streams, and oceans (surface water). Some water is also evaporated and absorbed by plants or continues to move down to become groundwater. Groundwater very slowly moves toward low areas such as streams and lakes which once again end up in surface water. This cycle is continuous and shows how the two are interconnected. Countries

http://environment.nationalgeographic.com/environment/freshwater/groundwater/

Groundwater is the water that...
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