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b2 150 m. During hurricane Carol in 1955, a record flow
rate of 1000 m3/s was estimated. Use this information to
estimate the maximum flood depth y2 during this event.
The answer to Prob. 10.34 is that the 8ft width is 29 percent more efficient than the 4ft width and is almost optimum. Verify this result, using the “bestefficiency” concepts of Sec. 10.3.
A rectangular channel has b 3 m and y 1 m. If n and
S0 are the same, what is the diameter of a semicircular
channel that will have the same discharge? Compare the
two wetted perimeters.
A trapezoidal channel has n 0.022 and S0 0.0003
and is made in the shape of a halfhexagon for maximum
efficiency. What should the length of the side of the hexagon be if the channel is to carry 225 ft3/s of water? What
is the discharge of a semicircular channel of the same
crosssectional area and the same S0 and n?
Using the geometry of Fig. 10.6a, prove that the most efficient circular open channel (maximum hydraulic radius
for a given flow area) is a semicircle.
Determine the most efficient value of for the Vshaped
channel of Fig. P10....
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 Spring '08
 Sakar

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