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Dams & Hydraulic Structures (October 2010)

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Total No. of Questions : 12] P1030 [Total No. of Pages : 3 [3864]-119 B.E. (Civil) DAMS AND HYDRAULIC STRUCTURES (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) 7) 8) Q. 1 or Q. 2, Q. 3 or Q. 4, Q. 5 or Q. 6 from section-I Q. 7 or Q. 8, Q. 9 or Q. 10, Q. 11 or Q. 12 from section-II. Answer any three questions from each section. Answer three questions from section-I and three questions from section-II. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) Discuss the various investigations required to be carried out to determine [8] the most suitable site for a dam. b) Explain the terms : i) ii) [8] Rockfill dam. Balloon dams. OR Q2) a) Discuss the various factors which govern the selection of type of dam.[8] b) i) ii) Explain the dam instrumentation-uplift cell inclinometer & strainmeter. What are the limitations of watershed management. [8] Q3) a) Discuss in brief various investigations required for reservoir planning.[8] b) Design an elementary profile of a gravity dam to store water upto a depth of 50 m. Assume uplift factor = 0.75 specific weight of dam material = 24 kN/m3 coefficient of friction = 0.7. Also calculate principal & shear stresses at heel and toe. [10] P.T.O. OR Q4) a) i) ii) Explain how you will find the uplift pressure on a gravity dam provided with drainage gallery. [8] Differentiate between low and high gravity dam. b) What is area-elevation curve? Also explain elevation-storage curve. What is the use of these curves in reservoir planning? [10] Q5) a) A cross section of a homogenous earth dam is drawn to a scale of 1cm = 25m. Following results were obtained on a trial slip circle. [8] Area of N-diagram = 20sq. cm. Area of T diagram = 10sq. cm. Area of U diagram = 5sq. cm. Length of arc = 15cm. Soil properties are - cohesion = 22 kN/m3 - angle of internal friction = 28o sp. wt. = 22 kN/m3 Determine the factor of safety of slope. b) What are the causes of failure of earth dam. [8] OR Q6) a) Enlist the various types of spillway gates explain any one. [8] b) Design an ogee spillway by USWES method for the following data : [8] Max. discharge = 3500m3/s Length of spillway = 175m Max. water depth above bed = 55m U/S face vertical Neglect end contraction and velocity of approach D/S slope of spillway = 0.75 H : 1V Coefficient of discharge = 2.2 State crest level of spillway SECTION - II Q7) a) Explain in detail, with sketch, the correction for mutual interference of piles as per Khosla s theory of independent variables for weir on permeable foundation. [8] [3864]-119 2 b) i) ii) What is a barrage? How does a barrage differ from a weir? What is a canal headworks? Describe the functions of a canal headworks. [8] OR Q8) a) Discuss Bligh s Creep theory for the design of weir on permeable foundation. [6] b) Write short notes on : i) ii) iii) [10] Lake Tapping. Control Structures - head regulators. Layout of a typical diversion headworks. Q9) a) Design an unlined canal in alluvial soil using Lacey s theory to carry a [8] discharge of 18m3/s. Take silt factor = 1.00. b) Write short notes on : i) ii) [10] Benefits of canal lining. Initial, final regime, regime theory. OR Q10) a) Explain different types of cross drainage works provided on a canal alignment and state the conditions under which each one is suitable.[8] b) Explain Kennedy s theory for design of canal. Q11) a) Explain in detail-classification of groynes. [10] [8] b) Explain how water power potential of a stream is assessed. Also state the data required. [8] OR Q12) a) State and explain the objectives of river training. b) Write short notes on : i) ii) [10] Run off river plant Types & selection of turbines. xxxx [3864]-119 [6] 3

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Additional Info : 2003 Course
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