Environment | Environmental science homework help

Question 1

1. Write an essay consisting of at least 500 words addressing ALL of the following topics (a. through e.):
1. Describe the Anthem Community Park in Maricopa, Arizona? Why do you think the authors included it in the textbook?
2. Regarding heavy metals:
1. Explain how heavy metals are an environmental health problem.
2. How does a heavy metal get into the food chain?
3. List two heavy metals and describe why they are health concerns.
3. What are the pros and cons of DDT and PCBs? Why, at one time, were DDT and PCBs extremely useful chemicals, but now they are prohibited? Explain how Rachel Carson’s book, Silent Spring, had an influence on DDT regulations.
4. If a soil consists of 65% sand, 25% silt, and 10% clay, what is its soil classification using the triangular soil classification chart?
5. Describe the type of soil and bedrock in the city or military base where you reside (or the nearest city to your home or base).

You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.

Question 2

1. Write an essay consisting of at least 500 words addressing ALL of the following topics (a. through h.):
1. If the elevation of locations D and E are 30 m instead of 55 m, and all other items are the same as shown in Figure 2-5 on page 26 of your textbook, what is the pressure at D in kPa? Show your work.
2. Explain how a Bourdon pressure gage works and how a pressure transducer works.
3. A 6-inch diameter pipe flowing full carries water at an average velocity of 8 ft/s. What is the flow rate in the pipe in cfs? Show your work.
4. In Figure 2-14(b), why is h2 less than h1?
5. Explain what the hydraulic grade line represents and why it is useful.
6. If water flows through a pressurized pipe with an HGL slope of 0.04 ft/ft over a distance of 2000 ft, what is the pressure loss in psi? Show your work.
7. A particular gravity sewer conveys 2 cfs when flowing full. If instead, this sewer flows at a d/D ratio of 0.94 (see Figure 2-22 for definition of d/D ratio), what is the flow rate in cfs?
8. Explain the differences between gradually varied flow and rapidly varied flow.

You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.

Question 1

1. Write an essay consisting of at least 500 words addressing ALL of the following topics (a. through i.):
1. Explain why rainfall varies throughout the United States.
2. Explain how the urban hydrologic cycle is different from the natural hydrologic cycle.
3. If 2 inches of rain falls during an 8-hour storm, what is the average rainfall intensity in inch/hour?
4. Explain the concept of recurrence interval.
5. Using Figure 3-6 in our textbook, what is the rainfall intensity (inch/hour) of a 100-year storm having a duration of 80 minutes?
6. What is the 100-year, 24-hour rainfall in Minneapolis, Minnesota (in inches)?
7. In a hydrograph, explain the concept of “base flow”.
8. Perform an Internet search and provide a website that shows a hydrograph for a river in the state of Nebraska. What is the maximum flow (also known as discharge and flow rate) shown on the graph?
9. Explain the concept of radius of influence of a pumping well.

You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.

50 points  

Question 2

1. Write an essay consisting of at least 500 words addressing ALL of the following topics (a. through i.):
1. Describe the difference between atomic weight, atomic number, and isotope.
2. If 15 grams of salt is dissolved in 500,000 grams of water, what is the salt concentration in ppm? Show your work.
3. Explain the significance of the water quality parameters turbidity, temperature, color, taste, and odor.
4. Describe biochemical oxygen demand. Why is it an important water quality parameter?
5. A sewage sample has a 5-day BOD of 350 mg/L. If k=0.15/day, what is the ultimate BOD? Show your work.
6. In Example 4-5 on page 91 of your textbook, what would be the TDS concentration (mg/L) if 150 mL of the sample were evaporated from the dish, rather than 100 mL (all other numbers remain the same)?
7. Explain the significance of chlorine residual and fluoride in drinking water?
8. What is the significance of algae and viruses to water quality?
9. Describe the multiple-tube fermentation method for coliform bacteria?

You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.