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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VII EXAMINATION WINTER 2018
Subject Code:X70601 Date: 15/11/2018
Subject Name: Design of Hydraulic Structures
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

What factors affect the selection of the most suitable dam for a particular site?
07

What are the requirements of a Spillway?
07
Q.2

Draw a sketch of the general layout of a diversion headwork. Explain function of its various components.
07

What is cross-regulator? What are the functions of a cross regulator?
07
OR

Enlist different types of fall and explain any one type of fall with sketch.
07
Q.3

Mention different types of Spillway Gates. Explain any two.
07

Write a note on Ski-Jump bucket, Roller Bucket
07
OR
Q.3

Explain any one type of Indian Standard Stilling Basin.
07

Define chute spillway with a sketch. Where would you prefer a chute spillway over an ogee spillway?
07
Q.4

Discuss various causes of failures of Earthen Dam? Discuss the methods to prevent different types of failures.
07

For calculating the seepage discharge, a flow net was plotted for a homogenous earth dam with a height of 35 m and free board of 2.5 m. The number of potential drops 13, number of flow channels 5. The dam has a 32 m long horizontal filter at the downstream end. Calculate the seepage discharge per meter run of the dam. Consider the coefficient of permeability of dam material as 5.5 × 10-4 cm/sec.
07
OR
Q.4

Discuss control of seepage in earthen dam.
07

Explain briefly the Swedish slip circle method to check the stability of earthen slope for any test condition for stability analysis.
07
Q.5

"The elementary profile of the gravity dam is theoretical profile which cannot be adopted in practice" Explain this statement.
07

For a gravity dam as shown in fig 1. Determine factor of safety against sliding, compressive stress, principal stress shear stress at toe. Consider only self weight of dam water pressure. Neglect tail water depth. Assume coefficient of friction 0.70, weight of concrete 24 kN/m3, weight of water 10 kN/m3.
07
OR
Q.5

Discuss the various purposes for which galleries are provided in dams.
07

Determine practical profile of concrete gravity dam for the given data. RL of base of dam 70 RL of HFL 140 Safe compressive stress in concrete 3000 kN/m2, Specific gravity of concrete 2.4, Height of waves 1.5 m
07
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Fig 1