JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III WATER RESOURCES ENGINEERING-I Previous Question Paper (March - 2024 - R13)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What is meant by ‘frequency of rainfall’ and ‘recurrence interval’?
Answer
Frequency of rainfall refers to the probability that a rainfall of a given magnitude will be equaled or exceeded in a given period. The recurrence interval (or return period) is the average time interval between occurrences of a rainfall event of a given or greater magnitude.
State the factors affecting Runoff.
Answer
Factors affecting runoff include:
- Precipitation characteristics (intensity, duration, and distribution).
- Meteorological factors (temperature, wind, and humidity).
- Catchment characteristics (size, shape, slope, and soil type).
- Land use and vegetation cover.
What is mass curve of a runoff?
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State the recording and non-recording rain gauges.
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Write the limitations of unit hydrograph.
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Define hydrograph.
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Define coefficient of transmissibility.
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What are the factors affecting duty?
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What is relation between sensitivity and flexibility of an outlet?
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Write the significance of lining of canal.
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Part B
What do you understand by precipitation? Explain various types of precipitation.
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Write the step by step procedure to calculate the average precipitation over an area by using Thiessen’s polygon method.
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Explain the procedure for checking the rainfall for consistency.
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A precipitation station X was inoperative for some time during which a storm occurred. The storm totals at three stations A, B and C surrounding X, were respectively 6.60, 4.80 and 3.70 cm. The normal annual precipitation amounts at stations X, A, B and C are respectively 65.6, 72.6, 51.8 and 38.2 cm. Estimate the storm precipitation for station X.
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Explain briefly the evaporation process. What are the factors that influence the process of evaporation?
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Describe SCS-CN method of estimating runoff. Write its uses.
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Discuss briefly reference crop evapotranspiration and actual evapotranspiration.
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In a 140-min storm the following rates of rainfall were observed in successive 20-min intervals: 6.0, 6.0, 18.0, 13.0, 2.0, 2.0 and 12.0 mm/h. Assuming the φ-index value as 3.0 mm/h and an initial loss of 0.8 mm, determine the total rainfall, net runoff and W-index for the storm.
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Define base flow. Discuss the methods of separation of base flow.
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Distinguish between: (i) a hydrograph and a hyetograph (ii) lag time and recession time.
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What do you understand by unit hydrograph? How is it derived? Explain its use in construction of flood hydrograph resulting from two or more periods of rainfall.
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The ordinates of a 4-hour unit hydrograph are given below. Derive the ordinates of 8-hour unit hydrograph by the S-curve method.
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Distinguish clearly between shallow well and a deep well. How does a deep well in confined aquifer?
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Compare surface irrigation with sub-surface irrigation.
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What do you understand by recuperation test? Derive the equations used in the test.
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Write notes on the following: (i) Saturation capacity, (ii) Field capacity, (iii) Wilting point, (iv) Optimum moisture content.
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Enumerate various types of linings used for canal.
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Describe the method of designing a canal based on Lacey's theory.
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What do you understand by rigid module? Describe the working of Gibb’s module.
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What is water logging? What are its ill-effects?
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