Figure 14.4 illustrates how a septic tank and drain field is used to treat house
ID: 110642 • Letter: F
Question
Figure 14.4 illustrates how a septic tank and drain field is used to treat household wastewater. a) Explain why it is so important that the drain field and gravel bed of the septic system be located well above the water table. b) Describe a common landscape position where people like to build homes, but where the geologic conditions make it nearly impossible for septic tanks to function properly. Figure 14.4 - Subsurface view of a septic tank and drain field, which are used to treat wastewater for individual households not connected to a municipal sewer system. Explain what inevitably happens when homeowners fail to have the sludge periodically pumped out of their septic tanks. Figure 14.5 shows the drainage basin of the Mississippi River and the hypoxic or dead zone that has developed in the Gulf of Mexico. Here, excessive amounts of nutrients are being carried by the modem Mississippi and then discharged into the Gulf of Mexico, causing an oxygen-depleted (i.e.. hypoxic) zone. a) Describe at least two anthropogenic (human) sources for the excessive nutrients being carried by the modern Mississippi. b) Explain how the oxygen-depleted zone in the Gulf of Mexico would impact both the marine life and human economy in the region.Explanation / Answer
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a) When ground water inundates the septic tank, water will leaking through any opening such as manhole cover etc., will fill the tank with gorund water insted of waste water from the house. In addition the high water table may saturate the drain field. when this happens the waste water coming from the house cannot move through septic system easily. water may flow from drainfield back into septic tank.
b)Average geological and soil conditions are imporatant factors leading to the failure of private septic tank waste disposal. overloading drainage system is the primary cause of failure. Conditions that cause overloading are in many ways.
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a)Nitrogen and phosphurus are the two main nutrients carried out by Mississippi
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