GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2170609
Subject Name: Irrigation Engineering
Date: 28/11/2019
Time: 10:30 AM TO 01:00 PM
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q1 | (a) Derive the relation between duty and delta. | 03 |
| (b) Define: (1) field capacity (ii) permanent wilting point (iii) ultimate wilting point (iv) available moisture | 04 | |
| (c) What is consumptive use of water? Describe any one method in detail. | 07 | |
| OR | ||
| Q2 | (a) define : (i) crop ratio (i1) paleo (ii1) capacity factor | 03 |
| (b) List various irrigation efficiencies and explain any two. | 04 | |
| (c) A canal takes off from a reservoir. Data for irrigated crops are given in table below. | 07 |
| Sr. No. | Name of crop | Base Period (days) | Area under crop (ha) | Duty at the head of the canal (ha/cumecs) |
|---|---|---|---|---|
| 1 | Bajri(monsoon) | 120 | 6500 | 2500 |
| 2 | Jwar (Rabi) | 120 | 5000 | 1500 |
| 3 | Sugarcane | 280 | 500 | 600 |
| 4 | Sugarcane (overlap) (HW) | 100 | 250 | 600 |
| 5 | Vegetable (HW) | 120 | 500 | 700 |
| OR | ||
| Compute discharge required at the head of the canal. Time factor is 0.65 and capacity factor is 0.8 Assume losses as 20% | ||
| Q.3 | (a) What should be the objective of a good method of application of water? | 03 |
| (b) Give the classification of various methods of irrigation. | 04 | |
| (c) Explain the salient features of the sprinkler irrigation system. | 07 | |
| OR | ||
| Q.3 | (a) What are contour laterals? | 03 |
| (b) What are the advantages of furrow irrigation? | 04 | |
| (c) Explain the salient features of the drip irrigation system. | 07 | |
| Q.4 | (a) Draw the layout of a canal system. | 03 |
| (b) What are the requirements of good lining material? | 04 | |
| (c) Design an irrigation channel by Kennedy’s theory to carry a discharge of 8 cumecs. Take m=1.0, N=0.0225, and B/D ratio=5.0 | 07 | |
| OR | ||
| Q.4 | (a) What is leaching? | 03 |
| (b) What are the ill effects of water logging? | 04 | |
| (c) The bed slope of a regime channel is 1 in 6000. Determine the channel section and discharge. The average particle size is 0.323mm | 07 | |
| Q.5 | (a) What are scouring sluices? Why it is provided? | 03 |
| (b) Draw a neat sketch of vertical drop weir. | 04 | |
| (c) Describe Bligh’s creep theory for the design of weir over pervious foundation. | 07 | |
| OR | ||
| Q.5 | (a) What is fish ladder? Why it is provided? | 03 |
| (b) What is canal fall? Why is it necessary to provide a fall in a canal? | 04 | |
| (c) Explain with neat sketch aqueduct and siphon aqueduct | 07 |
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