Papers

B.E. (Civil) DAMS & HYDRAULIC STRUCTURES (2008 Pattern) (Sem. – I)

Time :3 Hours]                                                                           [Max. Marks :100

Instructions to the candidates:-

1)            Answer QI or Q2, Q3 or Q4, Q5 or Q6 from Section I, Q7 or Q8, Q9 or QIO, QII or Q12 from Section II.

2)            Answer any 3 questions from each section.

3)            Answer 3 questions from section I and 3 questions from section II.

4)            Answers to the two sections should be written in separate books.

5)            Neat diagrams must be drawn wherever necessary.

6)             Pigures to the right indicate full marks.

7)             Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed.

8)            Assume suitable data, if necessary.

SECTION – I

QI) a) What are ‘arch’ and buttress dams? Illustrate with sketches and mention site conditions favourable for construction of such dams.                                [10]

b) Explain the influence of following factors on the choice of the type of dam.          [6]

i)              Geology 8 foundation conditions.

ii)            Spillway size and location.

OR

Q2) a) Explain briefly is guidlines for dam safety.                                                          [6]

b) Explain the thin cylinder theory of design of an arch dam.                           [10]

Q3) a) Explain step by step method of design of gravity dam.                                      [9]

b)            Explain in detail the various forces causing instability in a gravity dam. [9]

Q4) a) Explain with the help of diagram various joints and water seals provided in gravity dam.                                                                                                                               [6]

b)            Find the hydrodynamic pressure 8 moment due to earthquake on a dam with vertical u/s face 8 depth of water equal to I00m when intensity of earthquake is 0.29.        [6]

c)            Explain foundation treatment for a gravity dam.                                [6]

Q5) a) Determine the factor of safety of downstream slope of (homogenous section) an earth dam drawn to a scale of 1:750, for the following data: [8]

 i) Area of N-rectangle = 20 cm2 ii) Area of T rectangle = 10 cm2 iii) Length of slip circle arc = 20 cm iv) Angle of internal friction = 26° v) Cohesion c = 4000 kg / m: vi) Specific weight of soil = 1760 kg/mQ

b) Explain the following:                                                                                              [8]

i) Cut-off                                                 ii) Chimney drain

OR

Q6) a) What do you understand by piping? What measures may be taken to ensure safety of an earthen dam against the failure due to piping? [10] b) Explain the terms                   [6]

i)   Relief well                            ii) Rock toe    iii) Berms

SECTION – II

Q7) a) A spillway is to discharge water 30 mQ/s/m length. The maximum water level above the river bed is 35M. The upstream face is vertical and the downstream face has a slope of 0.75 H to IV. Design the profile of a spillway crest.                                                 [8]

b) Write short notes on                                                                            [8]

i)             Bucket type energy dissipator

ii)           Side channel spillway.

OR

Q8) a) Write short notes on                                                                                                  [8]

i)    Automatic gates      ii) Vertical gates.

b)            How is Khosla’s theory applied for design of a structure on permeable foundation? Explain the importance of exit gradient.                                                        [8]

Q9) a) How irrigation canals are classified? Describe briefly various considerations made in the alignment of an irrigation canal.                                                 [10]

b) What are cross drainage works? What is their necessity? How is the choice of the type of cross drainage works is made? Draw a neat sketch of an aqueduct.   [8]

OR

QIO) a) Write short notes on (any two)                                                                             [8]

i)   Canal Fall     ii) Canal regulators

iii)        Purpose of outlets.

b) Explain – bed load, Suspended load. Explain – Tractive force method of design of stable channel in alluvial material.                                                                 [10]

Qll)a) Explain – Groynes – Purpose, Classification with sketches.                                [8]

b) Explain the following terms                                                              [8]

OR

Ql2AWrite short notes on (any four)                                                           [16]

a)            Cut off

b)            Ditched islands

c)             Surge tank

d)            Assessment of power potential

e)            Underground power house