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Dams & Hydraulic Structures (April 2010)

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Total No. of Questions : 12] P1306 [Total No. of Pages : 4 [3764]-119 B.E. (Civil) DAMS AND HYDRAULIC STRUCTURES (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Solve Section-I Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6. 2) Solve Section-II Q.7 or Q.8, Q.9 or Q.10, Q.11 or Q.12. 3) Answers to the two sections should be written in separate books. 4) Neat diagrams must be drawn wherever necessary. 5) Figures to the right indicate full marks. 6) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) b) Q2) a) b) Q3) a) Discuss the various factors which govern the selection of type of dam. [10] Write short notes on: [6] i) Rockfill dams. ii) Arch dam. OR Write short notes on: [9] i) Inspection of dams. ii) Safety of dams during and after construction. iii) Balloon dams. What are the factors which affect the selection of site for a dam. Discuss them briefly. [7] Write short notes on (any three): [12] i) Galleries in gravity dam - classification, location and purpose for which galleries are provided. ii) Investigations required for reservoir planning. iii) Various zones of storage in a reservoir. iv) Zone method of design of a gravity dam. P.T.O. 1 b) The following table gives monthly mean flow rate. The demand rate is [6] constant 80 m3/s. Determine the required storage capacity. Month June July Aug. Sept. Oct. Nov. Dec. Jan. Feb. March April May Mean flow rate m3/s Q4) a) i) 25 55 195 305 195 155 105 80 65 45 25 25 OR What are the factors on which the selection of the site of a reservoir depend? [4] ii) b) What do you understand by a mass curve? How to find out safe yield from the mass inflow curve? [4] A gravity dam 100m height, tap width 7m bottom width 70m, u/s face vertical, d/s face has a slope of 7H : 10V from a point of 10m below the top Freeboard is 3m. Test the stability of the dam. Calculate principal stresses at the toe and heel of the dam. Assume unit weight of masonry = 24 kN/m3. unit weight of water = 10 kN/m3. Permissible shear stress of joint = 1400 kN/m2. Q5) a) [10] i) What are the criteria for safe design of earth dam? [3] ii) List the critical conditions for stability of side slopes of an earth dam. [2] iii) What do you understand by construction pore pressure in earth dams and how are they determined? [3] b) A ogee type spillway has 20 crest gates each having 10m clear span. Find the maximum flood that can be safely passed by lifting all the gates when the maximum reservoir level is 105.00m and the crest level is 101.00 M. Take coefficient C = 2.16. Coefficient of end contractions for piers = 0.05 Coefficient of contractions for abutments = 0.1. Neglect velocity of approach. Also design d/s profile of this spillway of gravity dam having d/s face slope 0.7H : 1V. [8] OR [3764]-119 2 -2- Q6) a) b) For an earthen dam of homogenous section with a horizontal filter, upto a length of 30m from d/s end, draw the top phreatic line. The top width of the dam is 6 m, u/s slope 3 : 1, d/s slope 2:1, total height of dam 20m with free board of 2m. If the coefficient of permeability of the soil material used in the dam is 5 10 4 cm/s, find the seepage flow per unit length of the dam. [10] Explain in brief shaft spillway or side channel spillway. [6] SECTION - II Q7) a) In what way storage headworks is different from diversion headworks? What are the various purposes of a diversion headworks? [8] b) Explain Khosla's theory of design of weir on permeable foundation. List the various corrections that are needed in its application. [8] OR What are the main causes of failure of weirs on permeable foundations? Explain Bligh's creep theory for seepage below a weir. [8] Q8) a) b) Explain the functions of the following components of diversion head works. [8] i) Canal head regulator. iii) Divide wall. Q9) a) Describe briefly the various considerations made in the alignment of a canal? [6] b) Design an irrigation canal is alluvial soil using Lacey's silt theory for the given data Full supply discharge = 15 cumes. Lacey's silt factor = 0.9 Side slope of canal = 0.5H : 1V. c) Q10)a) b) What is a cross regulator? What are the functions of a cross regulator? [6] OR State the factors which govern the type of cross-drainage work. Also explain how would you avoid one type of cross drainage work and prefer the other one by simply changing the canal alignment, taking off from a head work. [9] What are the advantages of canal lining? How will you justify economically the necessity of lining of an existing canal? [9] [3764]-119 3 [6] -3- Q11)a) b) Q12)a) b) What are the different types of hydropower plants based on storage characteristics? Explain any one in detail with sketch. [8] What are merits and demerits of river training by levees? Describe how a river is controlled with the help of levees? [8] OR What is cut off? Describe briefly how a cut off may be used as river training measure? [8] Distinguish between a run-of-river plant and a storage plant. Also draw neat sketches. [8] [3764]-119 4 -4-

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Additional Info : April 2010 Examination - Dams & Hydraulic Structures (2003 Course)
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