ENV4001_spr09_final_exam - ENV 4001: ENVIRONMENTAL SYSTEMS...

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p 1 ENV 4001: E NVIRONMENTAL S YSTEMS E NGINEERING Spring 2009 University of South Florida Final Exam Civil & Environmental Eng. Thursday, April 30 Prof. J.A. Cunningham Instructions: 1. You may read these instructions, but do not turn the page or begin working until instructed to do so. 2. Answer all questions in an exam book (“blue book”) or on your own paper. Make sure your name is on your pages, and that you submit all your pages . Staple them if you can. 3. You do not need to turn in this exam unless you answered questions directly on these pages (in which case, make sure your name is on it). 4. You are allowed to use your text book, your course notes, or other printed materials. You may not receive help from another person. 5. A calculator is recommended. Other electronic devices are not permitted. 6. Time limit: 120 minutes. Stop working when asked. If you continue working after time has been called, you will be penalized at a rate of 1 point per minute. 7. The exam contains four questions. All students should answer question #1 and #2. Then, choose either #3 or #4 . If you attempt both, indicate clearly which one you want me to grade. 8. The total point value for the exam is 120 points. On average, you have 1 minute per point. Gauge your time accordingly. 9. Don’t cheat. Cheating will result in appropriate disciplinary action according to university policy. More importantly, cheating indicates a lack of personal integrity. 10. Hints: Read each question carefully and answer the question that is asked. Watch your units. If you take good care of your units, they will take good care of you. Be sure that you report your answers with units if required. Use a reasonable number of significant digits. You may be graded down if you report an excessive number of significant digits. For maximum credit, show all your work and state your assumptions clearly.
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p 2 1. (60 points) Hydrology, ecosystems, material balances, risk assessment, air pollution Imagine a fictional lake called Drago Lake. The lake has an area of 1.8 km 2 , an average depth of 8.5 m, and a volume of 1.53×10 7 m 3 . Drago Lake is fed by a system of rivers and streams that drain a watershed of area 90 km 2 . The runoff coefficient in the Drago Lake watershed is 0.30. One major river (the Lyle River) flows out of Drago Lake at an average flow rate of 3.4 m 3 /s. Recently there was a dry spell in the Drago Lake area. For thirty days in a row, it was hot, dry, and windy. During this time period, the average air temperature was 30 ºC, the water temperature in the lake was about 25 ºC, the average wind speed over the lake was 5.5 m/s, and the relative humidity in the air was 40%. Evaporation out of Drago Lake is described with the Dalton equation:
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ENV4001_spr09_final_exam - ENV 4001: ENVIRONMENTAL SYSTEMS...

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