Final Exam -- CEIE 340 -- Fall 2006 -- MHH Solutions

Final Exam -- CEIE 340 -- Fall 2006 -- MHH Solutions - CEIE...

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Page 1 of 11 CEIE 340 Final Exam December 13, 2006 Instructions: You may use your books, notes, calculators to answer questions on this exam. You may not use any computer. You may not share resources with other students, and all questions should be directed to the instructor. Your exam answers are to be the result of your work exclusively. Show all work. Document your work. Neatness counts. Your grade will depend on the method you use and the final answers you give. On completion of the exam, sign below to indicate your full compliance with the GMU Honor Code and the rules given above. Signature Printed Name Date 1. Indicate whether each statement below is TRUE or FALSE. Portions that are in italics are part of the problem setup and you should assume are given. [2 points each] a. Weirs and orifices are often used as part of the outlet works for a detention pond. TRUE b. Baseflow in a stream results from flows from the groundwater into the stream. TRUE c. Direct runoff includes baseflow. FALSE d. The convex routing method computes the downstream flow this period as a function of the upstream flows for this period and last period. FALSE e. The Rational Method for estimating detention pond storage assumes the design storm hydrograph is triangular with the flow beginning at time zero, the peak occurring at a time equal to the time of concentration, and the flow ending at a time equal to twice the time of concentration. TRUE f. The Loss-of-Natural-Storage method, using the Rational method to determine runoff depths, is the best of the methods to estimate the volume of detention storage volume. FALSE g. Unit hydrographs are useful in pond routing. FALSE
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Page 2 of 11 CEIE 340 Final Exam Fall 2006 h. The loss-of-natural-storage method always provides a storage estimate that is within 5% of the actual storage volume ultimately needed. FALSE i. The Rational Method is mostly used for small watersheds, typically less than 200 acres. TRUE j. Type III storms are best for use in northern Virginia. FALSE k. Curve numbers are higher for soils that are more pervious. FALSE l. Pavement-drainage inlets are typically designed to ensure that the 100- year storm will result in no backups onto the street. FALSE m. Reservoir routing requires knowledge of the relationship between stage and storage volume in the reservoir.
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Final Exam -- CEIE 340 -- Fall 2006 -- MHH Solutions - CEIE...

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