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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (OLD) EXAMINATION — WINTER 2018
Subject Code: 170602 Date: 19/11/2018 --- Content provided by FirstRanker.com ---
Subject Name: Irrigation Engineering
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.
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Q.1 (a) Define duty and delta. Derive a relationship between duty and delta for a given base period. Also briefly discuss factors affecting duty. [07]
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(b) Define diversion headwork. Describe the function of each component of diversion head work with a neat diagram. [07]
Q.2 (a) Differentiate between the following: [07]
(1) Sprinkler Irrigation and Drip Irrigation
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(i) Weir and Barrage
(b) Explain various irrigation efficiencies. [07]
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OR
(b) Discuss classification of soil moisture. Also explain significance of field capacity and permanent wilting point in deciding frequency of irrigation. [07]
Q.3 (a) Explain Lacey’s silt theory. Using Lacey’s basic regime equations derive an expression for scour depth. [07]
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(b) What do you mean by lining a canal? What are the advantages of it? [07]OR
Q.3 (a) Describe Khosla’s theory elaborating its salient features clearly with flownet. [07]
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(b) Discuss causes of failure of weirs and explain measures to prevent such failures. [07]
Q.4 (a) What do you mean by water logging of soil? How would you prevent it? [07]
(b) A water course has CCA of 2600 hectares, out of which the intensities of irrigation for perennial sugarcane and rice crops are 20% and 40% respectively, The duty for these crops at the head of water course are 750 hect/cumec and 1800 hect/cumec respectively, Find the discharge required at the head of water course if the peak demand is 20% higher than average requirement. [07]
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OR
Q.4 (a) Explain the necessity of canal fall. Why is the ‘Cistern’ provided below the canal fall? [07]
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(b) Design an irrigation canal to carry discharge 5 cumecs. Take m=1.0, N=0.0225, and B/D ratio = 4.40. [07]Q.5 (a) Differentiate between the Aqueduct and siphon Aqueduct and mention the functions of cross regulator. [07]
(b) What are the different types of irrigation schemes? Discuss the salient features of each. [07]
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OR
Q.5 (a) Write short note on [07]
(1) Silt control devices (2) Canal escape
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(b) Explain border strip method of irrigation with neat sketch. [07]
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