CIV E 530- OPEN CHANNEL HYDRAULICS FALL 2010 FINAL EXAM MONDAY, DECEMBER 13, 2010, 1530-1730 Name: ____________________ Red ID _____________________ Grade: ____________

Instructions: Closed book, closed notes. Use engineering paper. When you are finished, staple your work in sequence (1 to 4), and return this sheet with your work.

(20%) A hydraulically wide channel is operating at Froude number F = 0.3. The unit-width discharge is q = 2.0 m2s-1. What are two Langrange absolute celerities? (20%) You are observing the rising flood stage of a major river. At your observation point, at a certain time the discharge is 495 m3 s-1, and the stage is rising at the rate of 5 mm hr-1. At a point located 18 km upstream of your observation point, the stage is rising at the rate of 7 mm hr-1. The surface width of the river in the study reach is 125 m. What is your estimate of the present discharge at the upstream end of the reach? (40%) Please answer each question in one clear and concise paragraph: Compare in tabular form the kinematic, diffusion, dynamic, and inertia-pressure waves in terms of their celerity and attenuation properties. What is the difference between the Muskingum and Muskingum-Cunge methods of flood routing? What are three ways in which the Seddon formula can be expressed? Which one did Seddon present in the year 1900? What flood waves are more likely to be dynamic? Why? What is the difference between sediment production and sediment yield? Why is is there a difference? What is this difference a function of? What is the difference between sediment transport and sediment routing? Which is the only sediment transport method that considers all modes of sediment transport, by size fractions, measured and unmeasured? What point or aspect of this class most caught your attention and interest? (20%) Write a 200-word essay on HEC-RAS. Separate explicitly into four paragraphs (5 points each): (1) history, (2) objectives, (3) equations and solution, and (4) data requirements.