Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 16, Problem 15P
To determine
(a)
The flow depth for a rectangular channel lined with rubble masonry.
To determine
(b)
The flow velocityfor a rectangular channel lined with rubble masonry.
To determine
(c)
The type of flowfor a rectangular channel lined with rubble masonry.
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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
A rectangular concrete channel (n = 0.015) is 10.5 ft wide, has a
slope of 0.006, and a discharge rate of 200 cfs. Compute the
normal depth and critical depth. If the depth of flow is 5.7 ft, is
the flow subcritical or supercritical? What is the type of profile?
Chapter 16 Solutions
Traffic and Highway Engineering
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