Water Cycle Essays

Feb 2, 2009 Filed under:Samples — admin @ 10:02 pm

Water Cycle Essays

Writing water cycles essays starts with definition of the topic and preliminary research.  Once you have read some articles on the topic, you should create a simple outline with the main points arranged in any order.  Next, you may start free writing on the topic: put all ideas you have on the paper.  Later, you will revise your outline and include specific statements for each point. Of course, writing tips seem easy but not every student is able or willing to write his/her water cycle essays.  We offer assistance with writing your papers.  We are working 24/7 and we accept orders on all topics. Our team of writers consists of over 200 individuals who can handle virtually any topic within any, even the most urgent, deadline.  Order Custom Essay!

Water Cycle Essay Sample

Runoff is the portion of the water surplus (precipitation minus evapotranspiration) that is removed by surface drainage via streams or rivers. It constitutes the most important single source of fresh water for human use and plays an important role in balancing the water cycle by removing water surpluses and recharging the ocean basins. An appreciable part of runoff, and generally the most usable portion, is derived from ground water that discharges into streams or lakes whose beds lie below the water table. Precipitation that does not enter the ground usually runs off the surface quickly and is responsible for the high-water periods of stream flow. Although this surface flow is of much shorter duration than water from subterranean sources, it usually comprises the major part of the total runoff. Such surface runoff often is turbid and charged with suspended soil particles.

Once water has been removed from the surface following rains, however, streams adjust their volume of flow to the height of the water table, and the resulting runoff from subterranean sources is clear and relatively steady. Although the runoff supplied from underground sources contains more soluble material than surface runoff directly following precipitation, it is generally fresher than well water. With respect to salinity, stream water is almost always suitable for human use. Streams that contain water that has been used for irrigation in and regions, however, may have high salt contents. The Pecos River at Carlsbad, New Mexico, has been known to have a water-soluble salt content of over 2,000 parts per million. Despite the regulating effects of groundwater increments, runoff regimes show wide real and seasonal differences. Regional climatic differences in precipitation and evapotranspiration produce widely divergent runoff patterns. Regional quantitative differences in runoff, however, are usually several hundred times greater than the differences in precipitation between the same areas.

The reason for this is that the surface runoff over broad areas tends to be concentrated into stream or river channels. In the wide variety of runoff patterns, three major classes of stream-flow regimes may be recognized: (1) streams with fairly constant flow; (2) streams with unusually wide fluctuations in flow but with low minima; and (3) streams with wide fluctuations in flow and with high minima. Constant-flow streams, the first of the three types indicated above, are particularly useful as water-supply sources. Also, where suitable gradients are found, such streams are especially favorable for hydroelectric power development, since developmental projects can be easily planned for maximum efficiency where the flow is reliable.

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