Unformatted text preview: with
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 8-ft width is 29 percent more efficient than the 4-ft width and is almost optimum. Verify this result, using the “best-efficiency” 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 half-hexagon 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
cross-sectional 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 V-shaped
channel of Fig. P10....
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- Spring '08
- Fluid Dynamics, Fig, e-Text Main Menu, subcritical flow