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MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305577398
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
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Question
Chapter 16, Problem 14P
To determine
(a)
The flow velocity of the channel.
To determine
(b)
The flow depth of channel.
To determine
(c)
The type of flow.
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Q1( b) A float-finish concrete channel with bottom width of 3 m carries 3.5 m³/s of flow on bottom slope of 0.0003. Propose a cross section for the channel. Using the proposed shape section for this channel, compute :
(i) Critical depth of flow
(ii) Critical bottom slope of channel
(iii) State of flow based on Froude number when depth of flow is 2.5 m
(iv)Alternate depth of flow for the same specific energy in Ql(b)(iii) and the corresponding Froude number
(v) If a trapezoid section is used, analyse proportions for the most efficient trapezoid section given that the side slope is not fixed.
Water is flowing in a weedy excavated earth channel
of trapezoidal cross section with a bottom width of
0.8 m, trapezoid angle of 50° and a bottom slope
angle of 0.5°. (a) If the flow depth is measured to be
0.52 m, determine the flow rate of water through the
channel. (b) What would the flow depth be if the
bottom angle were 1°. (note: a = 1 m1/3 /s and the
manning coefficient for a weedy excavated earth
channel is 0.03)
V =
2/31/2
R₁==b+y/tan 6)
2y/sin 8
(b) Trapezoidal channel.
I
b
P
Water flows steadily in a 1.4-m-wide rectangular channel at a rate of 0.7 m3/s. If the flow depth is 0.40 m, determine the flow velocity and if the flow is subcritical or supercritical. Also determine the alternate flow depth if the character of flow were to change.
Chapter 16 Solutions
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