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built env assig 2 - Eric Russo The Built Environment 1...

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Eric Russo 9/29/10 The Built Environment 1) Erosion control and sediment retention: Surrounding wetlands and rivers is a wide variety of plants and soils called the riparian zone which slows down the process of incoming runoff and erosion due to storms. Now because of the built environment, we have destroyed riparian zones and also wetlands as a whole. Along with that our environment is filled with impermeable surfaces, creating faster water flow, increased erosion, and increased deposition of rocks. Flooding has now become a big issue. -Nutrient cycle: Waste treatment such as septic tanks have increased the amount of natural nutrients in the earth. One of these nutrients is nitrogen, which composes more of our atmosphere then oxygen does. Because of the large increase of nitrogen input into our environment, caused by faulty combined sewage systems, nitrates are formed which are very unsafe for the growth of plants, animals, and humans.
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