GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VIII (New) EXAMINATION — WINTER 2019
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Subject Code: 2180601 Date: 25/11/2019
Subject Name: Design Of Hydraulic Structures
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Enlist and explain the dams according to hydraulic design. 03
(b) What are the factors considering for selection of type of dam? 04
(c) Explain the various causes of failure of earthen dam in brief. 07
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Q.2 (a) Differentiate between low gravity dam and high gravity dam. 03
(b) Explain in brief types of rock-fill earthen dam with sketch. 04
(c) Define spillway? What is the purpose to provide it? What are the essential 07 requirements? Where the spillway is located?
OR
(c) An earthen dam made of a homogeneous material has the following data: 07
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Level of top of dam =200.0 m
Level of deepest river bed =178.0m
H.F.L. of reservoir =197.5m
Top width of the dam =4.5m
Upstream slope =3:1
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Downstream slope =2:1
Co-efficient of permeability of dam material = 5 x 10-4 cm/sec
Determine the phreatic line for this dam section.
Q.3 (a) Explain the different types of filters in earthen dam. 03
(b) Draw the neat sketches of elementary profile & practical profile of 04 concrete gravity dam.
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(c) Discuss the Swedish slip circle method for checking the stability of 07 downstream slope under steady seepage condition.
OR
Q.3 (a) What is HR and CR? Give the function of each. 03
(b) Enlist the various dam outlet works and give the function of each. 04
(c) Enlist and explain the various circumstances/modes due to which concrete 07 gravity dam may fail.
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Q.4 (a) Explain drainage gallery in dams. 03
(b) What are the different types of spillways? Explain open channel spillway 04 in brief.
(c) Differentiate between Jump Height Curve (JHC) and Tail Water Curve 07 (TWC). What are the different possibilities of occurrence of JHC and TWC?
OR
Q.4 (a) Explain ogee fall with sketch. 03
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(b) Enlist various drop structure and give function of each. 04
(c) Define Phreatic line in earthen dam. Discuss the graphical method for the 07 Phreatic line in a Homogeneous earthen dam with a horizontal drainage filter.
Q.5 (a) Classify concrete dams. Discuss briefly each type. 03
(b) Explain the term Chute blocks and Sills and Dentated sills 04
(c) Explain the procedure of locating a fall. 07
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OR
Q.5 (a) Explain in brief types of hydraulic jump based on Froude number. 03
(b) Show the forces acting on the gravity dam. 04
(c) What are the design criteria for various components of Sharda type fall. 07
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