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MU Civil Engineering (Semester 7)
Irrigation Engineering
December 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Discuss in brief the benefits and ill effects if irrigation.
6 M
1 (b) Write a note on sub-surface irrigation.
4 M
1 (c) Explain any one type of automatic rain gauge.
6 M
1 (d) What are causes of water logging.
4 M

2 (a) A field channel has culturable commanded area of 2000 hectares. The intensity of irrigation for gram is 30% and for wheat is 50%. Gram has kor period of 18 days and kor depth of 12 cm, while wheat has a kor period of 15 days and kor depth of 15 cm. Calculate the discharge of the field channel.
8 M
2 (b) Describe with the help of a diagram various forms of a soil moisture. What do you understand by the available moisture.
8 M
2 (c) What do you understand by crop rotation.
4 M

3 (a) What is hydrograph? Draw a single peaked hydrograph and explain its components.
8 M
3 (b) What do you understand by unit hydrograph.
4 M
3 (c) A 2 hr unit hydrograph in a rather steep catchment is given below:
 Time in (hr) 0 2 4 6 8 10 12 Discharge 100m3/s 0 0.54 1.75 1.27 0.58 0.25 0

Compute the 1 hr unit hydrograph for the catchment.
8 M

Write notes on following
4 (a) (i) Well lass.
3 M
4 (a) (ii) Aquifer.
3 M
4 (a) (iii) Interference among wells.
3 M
4 (a) (iv) Assumptions of Dupuits theory.
3 M
4 (b) A 30 cm diameter well ponetrates 25m below the static water table. After 24 hours of pumping @ 5400 liters/minute, the water level in a test well at 90 m is lowered by 0.53 m, and in a well 30m away the drawdown is 1-11m.
i) What is the transmissibility of the aquifer.
Also determine the draw down in the main well.
8 M

5 (a) Explain various types of reservoirs. What do you understand by multipurpose reservoir.
8 M
5 (b) Write a note on stability requirements of gravity dam.
8 M
5 (c) What do you understand by gravity dam? Enlist various forces acting on it.
4 M

6 (a) What is (i) Bultress dam (ii) Arch dam.
6 M
6 (b) Discuss in brief the causes of failures of earth dams.
6 M
6 (c) What is spillway? What are it's functions? Enumerate various types of spillways.
8 M

7 (a) A 25 m high concrete dam having trapezoidal section has top width 2m and bottom width 16m. The base of dam exposed to water has a slope of 1:10. on the reservoir side water stands up to top. Assume weight of concrete 2400 kg/m3 coefficient of friction 0.75. allowable shear stress 5kg/cm2. Consider weight of dam, water pressure and uplift pressure and check the stability of dam.
10 M
Write notes on following
7 (b) (i) Canal lining.
5 M
7 (b) (ii) Cross drainage works.
5 M

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