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Environment Homework #3

An open basin lake is a lake that is drained by

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An open basin lake is a lake that is drained by streams and rivers, meaning that water is constantly flowing in and out of the lake. In a closed basin lake, however, there are no streams or rivers to drain the lake, and they are instead drained through the forms of evaporation and percolation into underlying sediments. The reason closed basin lakes have high salt content is because of the lack of streams and rivers. Since evaporation is the method to drain the lakes, dissolved mineral salts such as sodium chloride are left behind. This often causes the water to be saturated with salts. 4) Section 12.4 Question #1: Explain why sometimes water will gush to the surface of a newly drilled well without pumping. A good way to think of how a well works is sort of like a straw; the well is the straw itself and rather than the sucking motion, a pump pulls the water up to the surface. Sometimes, however, water will gush to the surface of a newly drilled well without the form of pumping. This action is most likely because the well was drilled into a confined aquifer where the groundwater is under great pressure from the soil and rocks from above. This pressure causes the water to rise without the need of pumping. 5) Section 12.4 Question #3: Why does groundwater pumping near coasts often result in the intrusion of seawater?
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Since pumping is a very common way to obtain freshwater, over-pumping near seacoasts can cause seawater to move shoreward. The results of seawater moving shoreward is that the freshwater that people are attempting to obtain becomes increasingly saline.
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