Download GTU BE/B.Tech 2019 Winter 8th Sem Old 180601 Design Of Hydraulic Structures Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (Old) EXAMINATION — WINTER 2019

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Subject Code: 180601 Date: 27/11/2019
Subject Name: Design Of Hydraulic Structures
Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Explain the classification of dams based on hydraulic design and structural 07
design.

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(b) Enlist various causes of failure of an earth dam. Discuss only structural 07
failure causes in earth dam.

Q.2 (a) Define phreatic line in earthen dams. Also discuss procedure for locating 07
phreatic line in a homogeneous earth dam with a horizontal drainage filter.
(b) What is spillway? What are the requirements of spillway? Explain any two 07

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spillway with neat sketch.
OR
(b) Discuss factors affecting for the selection of dam site in detail. 07

Q.3 (a) Define energy dissipaters. What are the needs to provide it? 07
(b) Design practical profile of a gravity dam for the given data:

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* R.L. of base of dam =49 m
* R.L. of HFL.=98 m
* Safe compressive stress in concrete = 2450 KN/m2
* Specific gravity of concrete = 2.4
* Height of waves = 1.5 m

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OR
Q.3 (a) Explain the procedure for designing a Straight Glacis Fall . 07
(b) A homogenous earth dam has water depth of 25 m in the reservoir. The dam 07
has free board of 3 m. The top width of earth dam is 6 m. The upstream slope
of dam is 3 H to 1 V and downstream slope is 2 H to 1 V. The dam is

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constructed on an impervious strata. The coefficient of permeability of dam
material (K) is 7 x 10^-6 m/s.-Plot the corrected seepage line on graph paper and
estimate the seepage loss per unit length of the dam.

Q.4 (a) Write a short note on inspection galleries and contraction joints in gravity 07
dam.

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(b) Draw a neat sketch of rock-fill dam. How is the seepage of water controlled 07
through the body of rock-fill dam?
OR
Q.4 (a) Explain for an earth dam the function of (i) cut-off trench (ii) horizontal filter 07
and (iii) riprap with neat sketches.

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(b) Explain how the storage capacity of reservoir and height of dam are 07
determined.

Q.5 (a) Explain with a neat sketch the functions of head regulator. 07
(b) Explain how the ogee spillway is designed . 07
OR

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Q.5 (a) Explain stability requirements of a gravity dam. 07
(b) Discuss the effect of inertia force and hydrodynamic pressure on gravity dam. 07