JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III GROUND WATER DEVELOPMENT AND MANAGEMENT Previous Question Paper (February - 2023 - R16)
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
State the significance of occurrence of groundwater.
Answer
Groundwater is a critical natural resource that serves as a reliable source of water for irrigation, industrial processes, and domestic consumption. It acts as a buffer against drought, maintains base flow in rivers, and supports ecosystems by sustaining soil moisture and wetlands.
Define the terms: Porosity, specific yield, specific retention.
Answer
Porosity is the ratio of the volume of voids to the total volume of the soil or rock mass. Specific yield is the volume of water that an unconfined aquifer releases from storage per unit surface area per unit decline of the water table. Specific retention is the ratio of the volume of water retained against gravity in the pores to the total volume of the material.
Mention the applications of groundwater flow contours.
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A ground water basin consists of 25.5 km2 of plains. The maximum fluctuation of groundwater table is 2.75 m. Assuming a specific yield of 20%, determine the available groundwater storage.
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What are leaky aquifers, explain?
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Enumerate the assumptions and limitations of Dupuit’s theory.
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What is a geophone and how is it used in seismic refraction method.
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Discuss the principle of resistivity logging as a sub-surface exploration method.
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Highlight the data obtained in test drilling.
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Explain the measures taken to control and manage the saltwater intrusion.
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Part B
Explain the geological formation of various types of Aquifers.
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Write a detailed note on significance of groundwater in hydrological cycle.
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Illustrate the importance of Zone of Aeration and Zone of Saturation in classification of groundwater.
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Classify the rocks and explain the rock properties affecting the groundwater occurrence.
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Explain the concept of coefficient of permeability and coefficient of Transmissibility.
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Derive the groundwater flow equation in polar coordinate system.
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Illustrate any one experiment conducted to determine the coefficient of Permeability.
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Derive the Darcy’s law. Also state the assumptions, limitations and applications of this equation.
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Explain the concept of interference between two wells.
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A well penetrates fully a 15 m thick water bearing stratum of medium sand having coefficient of permeability of 0.0055 m/sec. The well radius is 15 cm and is to be worked under a drawdown of 4.25 m at the well face. Calculate the discharge from the well. What will be the percentage increase in the discharge if the radius of the well is doubled?
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Derive the governing differential equation for steady groundwater flow towards a well in unconfined aquifer.
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List and explain any one of the sub-surface exploration methods with a neat sketch.
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By means of a case study, discuss the applications of GIS in artificial recharge of groundwater.
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Describe different methods of well drilling, mentioning their merits and suitability for different field conditions.
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Classify the methods of Well construction and explain each in detail with neat sketches.
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