Drawing Water Wallpapers

Drawing Water - Mountain Boc Slovenia, photo wallpapers, Megawallpapers.org>7b>: Well water is drawn via mechanical pump from a source below the surface of the earth. Wells can vary greatly in depth, water volume and water quality. Well water typically contains more minerals in solution than surface water and may require treatment to "soften" the water. A well is a hole in the earth from which fluid is withdrawn. Although water wells are the most common type, oil, gas, and mining wells also exist. A well is made by reaching the water table. Wells can be made in a variety of ways, digging, driving, boring, or drilling. Wells draw water up from the ground, called ground water. Ground water is stored naturally below the earths surface. Most ground water originates as rain or snow that seeps into the ground and collects. Ground water provides about 20 percent of the fresh water used in the United States. Most rural areas, and some cities depend on ground water as their source for water. Driven wells consist of a series of pipes with a point at the end. The point is driven into the ground, thus the name driven, to a depth of up to 50 feet. Bored and drilled wells can be up to 100 feet and 1000 feet deep, respectively. These wells require special digging and drilling equipment. Most rainwater is absorbed by the ground and fills the tiny spaces between soil particles. However, excess water runs over the top of the soil until it reaches a river, stream, or reservoir. Runoff water brings pollutants it encounters along the way to the reservoir. As water seeps into the ground, it settles in the pores and cracks of underground rocks and into the spaces between grains of sand and pieces of gravel. In time, the water trickles down into a layer of rock or other material that is water tight. This water tight zone collects the ground water, creating a saturated zone known as an aquifer. Aquifers in the United States are usually made from gravel, sandstone, limestone, or basalt (volcanic rock). The water in the earth that these wells obtain is at a place in the ground known as the water table. The water table is the level of the ground water below the earths surface. This table is measured by the depth of the upper limit of the Aquifer. The water table can be lowered by lack of precipitation or overdraft. Overdraft is when a water is removed from the aquifer at a faster rate than can be naturally replaced by rain or snow. The lowering of the water table causes problems such as land subsidence, surface cracking, sinkholes on the surface, damage to the aquifers water producing character due to compaction, and in coastal areas, salt water intrusion. Salt water intrusion occurs when the water table is low and the ground water lacks sufficient water pressure to prevent the ocean from backing up into the ground water. In a damp area, the water table can be reached simply by digging. In this case the well walls are usually lined with brick, stone, or concrete in order to keep the sides from caving in on the well. A dug well can be up to 50 feet deep, and has the greatest diameter of any of the well types. Well water that contains a high number of dissolved minerals is called a mineral well. Underground water is considered fairly clean, except in Karst areas, because soils create a filter that remove large toxins.

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