SPPU Civil Engineering (Semester 8)
Dams and Hydraulic Structures
April 2013
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer any one question from Q1 and Q2
1 (a) Explain the role of dam in water resource development of a country. Classify dams based on different criteria giving example of each type and what are their advantages and disadvantages?
10 M
1 (b) Explain the suitability of construction of a particular type of dam under the following criterion.
2.Spillway size and location
3.Availability of construction material
6 M

2 (a) Enlist the various IS guidelines with reference to:
(i) Dam safety
(ii) Dam design
8 M
2 (b) What are salient features of an arch dam and different types of arch dam? Give three examples of arch dam?What is meant by best central angle of arch dam and what is its value?
8 M

Answer any one question from Q3 and Q4
3 (a) A concrete gravity dam has the following features above RL of 100.00m
Top of dam=200m RL
Water stands upto 195m RL
Width at top=7 m
Upstream batter of 1H to 10V at 150m RL
Downstream batter of 0.7H to 1V at 190m RL
Drainage gallery at 10 m from u/s vertical face
Uplift coefficient at gallery=0.6
Tail water depth=5m
Specific weight of dam material 24 kN /m3
Determine the normal stress at each end of base of dam when reservoir is empty and full.
12 M
3 (b) With a neat sketch of gravity dam,explain any three forces and their effect on dam.
6 M

4 (a) Give a brief outline of procedure for design of non-overflow section of a law gravity dam indicating clearly the forces considered for design.
10 M
4 (b) Find the minimum base width of an elementary triangular profile of a gravity dam 25m high considering its self weight,water pressure and uplift pressure only. Assume specific gravity of material of dam 2.25 and Uplift factor 0.5
8 M

Answer any one question from Q5 and 6
5 (a) Discuss various causes of failure of an earth dam.
8 M
5 (b) Explain Swedish slip circle method of slope stability analysis.
8 M

6 (a) Determine the factor of safety of downstream slope of an earth dam of homogeneous section drawn to a scale of 1:500 with the following data.
(i) Length of slip circle arc=15cm
(ii) Total area of N-rectangles = 16.5cm2 (iii) Total area of T-rectangles = 7cm2
(iv) Total area of U-rectangles = 5cm2 (v) Angle of internal friction= 26°
(vi) Cohesion = 0.2 kg /cm2
vii) Specific weight of soil =1.8 kg /cm2
8 M
6 (b) Explain the various desing principle of an earth dam.
8 M

Answer any one question from Q7 and Q8
7 (a) With the help of sketches briefly one energy dissipater provided for each of the following cases.
(i) Jump Height Curve(JHC)lies above Tail Water Curve(TWC) at all discharges.
(ii) JHC lies below the TWC at all discharges.
6 M
7 (b) Explain radial gate for spilway & it's working with the help of sectional view.
6 M
7 (c) Draw proportionate and neat labeled of typical diversion headwork showing its six important components. Write functions of any four components.
6 M

8 (a) Draw proportionate and neat labeled sketches of the following energy dissipater.
(i) Roller bucket
(ii) Ski-jump bucket
6 M
8 (b) Explain briefly Bligh's theory of seepage with sketch .State its four limitations.
6 M
Write brief notes on:
8 (c) (i) Safety and maintenance of spillway gates.
3 M
8 (c) (ii) Differences between weirs and barrages.
3 M

Answer any one question from Q9 and Q10
9 (a) What is meant by Cross-Drainage Work?Explain level crossing with the help of a sketch.
6 M
9 (b) State merits and demerits of canal lining.
5 M
9 (c) Discuss briefly various types of canal outlets.
5 M

10 (a) Design a trapezoidal irrigation channel to carry a discharge of 40 m3/s using Kennedy's theory.Assume ratio of base width (B) to depth (D) as 2.5, critical velocity ratio=1,Kutter's rugosity coefficient 'n'=0.023 and side slopes 1H:2V.
10 M
10 (b) State various types of canal falls and explain any one type with the help of a sketch.
6 M

Answer any one question from Q11 and Q12
11 (a) Explain run-of-river of hydro-power with the help of a neat sketch.
4 M
11 (b) Explain following components of a hydro-power plant with neat sketches.
(i) Forebay
(ii) Surge tank
4 M
11 (c) Draw a neat sketch & explain 'cut-off' as river training work.
4 M
11 (d) Explain with neat sketches,uses of Groynes and their types.
4 M

Explain the following with relevant sketches.
12 (a) Alternate dikes: Necessity and advantages
4 M
12 (b) Guide bunds: Purpose and types.
4 M
12 (c) Groynes: Classification and uses
4 M
12 (d) Pumped -storage type of hydro-electric power plant.
4 M

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