If the free surface of the Columbia River shown in Fig.
Chapter 10, Problem 10.44(choose chapter or problem)
If the free surface of the Columbia River shown in Fig. P10.43 were 20 ft above the bottom rather than 44 ft, as is indicated in the figure, how long would it take to float the 0.5-mi stretch considered in Problem 10.43? Assume the elevation change remains 0.46 ft.
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