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MU Civil Engineering (Semester 7)
Irrigation Engineering
May 2015
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

Explain the following.
1 (a) Determination of average rainfall over a catchment.
5 M
1 (b) ill effects of irrigation.
5 M
1 (c) Well development.
5 M
1 (d) Relation between duty and delta.
5 M

2 (a) The culturable commanded area of water course is 120 hectares. Intensities of sugarcane and wheat crops are 20% and 40% respectively. The duties the crops at the head of water course are 730 ha/ cumecs and 1800 ha/ cumecs respectively. Find (i) the discharge required at head of the water course. (ii) determine the design discharge at outlet assuming a time factor of 0.8.
10 M
2 (b) A 3- hour storm produced a flood hydrograph and the observation were at 3-hour intervals, staring from zero hour. The onserved discharges (cumecs) are 4,9,12,18,20,16,20,10,8,6,4. Assume constant base flow 4 cumes, determine unit hydrograph orfinates. The catchment area is 50sq.km.
10 M

3 (a) Derive the equation for discharge from well in an unconfined aquifer.
10 M
3 (b) A 30 cm dia well penetrates 20m below the static water table. After 24 hours of pumping at a rate 5000lt/ minute, the water level in a test well at 100m is lowered by 0.5m and in a well 30m away the drawdown is 1.00m what is the transmissibility of the aquifer? Also determine the drawndown in the main well.
10 M

4 (a) Explain the foundation treatment for gravity dams.
10 M
4 (b) A concrete dam can be assumed to be trapezoidal in section having top width 2m and bottom width 10m. Height of dam 15 m and its u/s face board allowance. Consider uplift pressure with intensity factor 100%. also determine stresses and heel. Assume weight of concrete 24 KN/m3, unit shear strength of concrete 14 kg/ m2, and coefficient of friction between concrete and foundation soil is 0.7.
10 M

5 (a) Explain different types of spillway gates,
10 M
5 (b) Draw the elementary profile of gravity dam and explain the procedure for determine base width of elementary profile of gravity dam.
10 M

6 (a) Explain the various causes of failure of earth dam.
10 M
6 (b) Explain with neat sketches the following
i) Rock toe
ii) Horizontal drainage blanket
iii) cut-off
iv) Rip-rap
10 M

Write notes on following
7 (a) Drainage galleries.
5 M
7 (b) Losses of water in canals.
5 M
7 (c) Sprinkler irrigation.
5 M
7 (d) Life of reservoir
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