5. (20 Points) Consider a channel width change in the same 7-foot wide rectangular in Problem 4. The horizontal channel narrows as depicted below. The flow rate is 90 cfs, and the energy loss (headloss) through the transition is 0.05 feet. The water depth at the entrance to the transition is initially 4'. 1 b₁ TOTAL ENERGY LINE V² 129 У1 I b₂ TOP VIEW 2 PROFILE VIEW h₁ = 0.05 EGL Y₂ = ? a) b) c) 2 Determine the width, b₂ that will cause a choke at location 2. Determine the water depth at the downstream end of the channel transition (y₂) section if b₂ = 5 feet. Calculate the change in water level after the transition. Plot the specific energy diagram showing all key points. Provide printout in homework. d) What will occur if b₂ = = 1.5 ft.?

Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter16: Highway Drainage
Section: Chapter Questions
Problem 13P
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Question
5. (20 Points) Consider a channel width change in
the same 7-foot wide rectangular in Problem 4.
The horizontal channel narrows as depicted
below. The flow rate is 90 cfs, and the energy
loss (headloss) through the transition is 0.05
feet. The water depth at the entrance to the
transition is initially 4'.
1
b₁
TOTAL ENERGY LINE
V² 129
У1
I b₂
TOP VIEW
2
PROFILE VIEW
h₁ = 0.05
EGL
Y₂ = ?
a)
b)
c)
2
Determine the width, b₂ that will cause a
choke at location 2.
Determine the water depth at the
downstream end of the channel transition (y₂)
section if b₂ = 5 feet. Calculate the change in
water level after the transition.
Plot the specific energy diagram showing
all key points. Provide printout in homework.
d) What will occur if b₂ =
= 1.5 ft.?
Transcribed Image Text:5. (20 Points) Consider a channel width change in the same 7-foot wide rectangular in Problem 4. The horizontal channel narrows as depicted below. The flow rate is 90 cfs, and the energy loss (headloss) through the transition is 0.05 feet. The water depth at the entrance to the transition is initially 4'. 1 b₁ TOTAL ENERGY LINE V² 129 У1 I b₂ TOP VIEW 2 PROFILE VIEW h₁ = 0.05 EGL Y₂ = ? a) b) c) 2 Determine the width, b₂ that will cause a choke at location 2. Determine the water depth at the downstream end of the channel transition (y₂) section if b₂ = 5 feet. Calculate the change in water level after the transition. Plot the specific energy diagram showing all key points. Provide printout in homework. d) What will occur if b₂ = = 1.5 ft.?
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