Section 7-3 The following twenty problems refer to a transition in a rectangular channel with a bottom elevation change Az, or a change in width from b, to b2, or both. Flow is from section 1 to section 2. A plus Az is upward. Analyze each problem using a specific energy diagram and determine the downstream depth. If the stated upstream flow is not possible, calculate the adjusted upstream conditions as well. Problems 7-21 to 7- 30 are in U.S. customary units and Problems 7-31 to 7-40 are in SI a b2 (ft) Az Problem (cfs) (ft) (ft) (ft) 7-21 200 5.5 10 0.3 10 200 1.8 10 -0.3 10 7-22 7-23 200 5.5 10 -0.3 10 7-24 200 1.8 10 0.3 10 7-25 300 6.0 12 0. 15 7-26 300 1.5 12 15 7-27 250 6.0 12 10 7-28 250 4.0 12 0. 8. 7-29 200 2.0 10 0.3 12 7-30 250 4.8 8 -0.5 10
Section 7-3 The following twenty problems refer to a transition in a rectangular channel with a bottom elevation change Az, or a change in width from b, to b2, or both. Flow is from section 1 to section 2. A plus Az is upward. Analyze each problem using a specific energy diagram and determine the downstream depth. If the stated upstream flow is not possible, calculate the adjusted upstream conditions as well. Problems 7-21 to 7- 30 are in U.S. customary units and Problems 7-31 to 7-40 are in SI a b2 (ft) Az Problem (cfs) (ft) (ft) (ft) 7-21 200 5.5 10 0.3 10 200 1.8 10 -0.3 10 7-22 7-23 200 5.5 10 -0.3 10 7-24 200 1.8 10 0.3 10 7-25 300 6.0 12 0. 15 7-26 300 1.5 12 15 7-27 250 6.0 12 10 7-28 250 4.0 12 0. 8. 7-29 200 2.0 10 0.3 12 7-30 250 4.8 8 -0.5 10
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Problem 7-24
Transcribed Image Text:The following twenty problems refer to a transition in a rectangular channel with a
bottom elevation change Az, or a change in width from bị to b2, or both. Flow is from
not possible, calculate the adjusted upstream conditions as well. Problems 7-21 to 7-
section 1 to section 2. A plus Az is upward. Analyze each problem using a specific
energy diagram and determine the downstream depth. If the stated upstream flow is
n.
Section 7-3
a
30 are in U.S. customary units and Problems 7-31 to 7-40 are in SI ua
b2
(ft)
Az
Problem
(cfs)
(ft)
(ft)
(ft)
200
5.5
10
0.3
10
7-21
7-22
200
1.8
10
-0.3
10
7-23
200
5.5
10
-0.3
10
7-24
200
1.8
10
0.3
10
7-25
300
6.0
12
0.
15
7-26
300
1.5
12
15
7-27
250
6.0
12
0.
10
7-28
250
4.0
12
0.
8.
7-29
200
2.0
10
0.3
12
7-30
250
4.8
8.
-0.5
10
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