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Unformatted text preview: 41. Textbook Table of Contents  Study Guide Problems 699
Fig. P10.50. If the channel surface is painted steel and
the depth is 35 cm, determine (a) the Froude number, (b)
the critical depth, and (c) the critical slope for uniform
flow. y θ θ P10.41
P10.42 P10.43
P10.44 P10.45 P10.46 25° Suppose that the side angles of the trapezoidal channel
in Prob. 10.39 are reduced to 15° to avoid earth slides. If
the bottom flat width is 8 ft, (a) determine the normal
depth and (b) compare the resulting wetted perimeter with
the solution P 24.1 ft from Prob. 10.39. (Do not reveal
this answer to friends still struggling with Prob. 10.39.)
What are the most efficient dimensions for a rivetedsteel
rectangular channel to carry 4.8 m3/s at a slope of 1 900?
What are the most efficient dimensions for a halfhexagon castiron channel to carry 15,000 gal/min on a slope
of 0.16°?
What is the most efficient depth for an asphalt trapezoidal
channel, with sides sloping at 45°, to carry 3 m3/s on a
slope of 0.0008?
It is suggested that a channel which affords minimum
erosion has a halfsinewave shape, as in Fig. P10.46. The
loc...
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 Spring '08
 Sakar

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