Unformatted text preview: similar to Fig. P10.124. Assume that the river is a weedyearth rectangular channel 100 ft wide with a flow rate of
800 ft3/s. Estimate the waterdepth 2 mi upstream of the
dam if S0 0.001.
P10.126 Suppose that the rectangular channel of Fig. P10.120 is
made of riveted steel and carries a flow of 8 m3/s on a 12 m 3/s Slope
0.7°
100 m 200 m P10.128 Word Problems W10.2 W10.3 W10.4 W10.5 W10.6
W10.7 Freesurface problems are driven by gravity. Why do so
many of the formulas in this chapter contain the square
root of the acceleration of gravity?
Explain why the flow under a sluice gate, Fig. 10.10, either is or is not analogous to compressible gas flow
through a convergingdiverging nozzle, Fig. 9.12.
In uniform openchannel flow, what is the balance of
forces? Can you use such a force balance to derive the
Chézy equation (10.13)?
A shallowwater wave propagates at the speed c0
(gy)1/2. What makes it propagate? That is, what is the balance of forces in such wave motion? In which direction
does such a wave propagate?
Why is the Mannin...
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 Spring '08
 Sakar

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