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Applied Hydrogeology ( GHT 406 ) – 2013


Department of Geology
University of Dhaka
Fourth -Year B.S. Honor’s Course -Final Examination 2013
Subject: Geology
Course: GHT 406 Course Name: Applied Hydrogeology
Subjective Part
Full marks 25 Time 2 Hours

The figure at the right margin indicates full marks. Answer any five of the following questions. Draw suitable sketcher and diagrams wherever necessary.

1.
a) Design a test well for a confined aquifer and label its different parts. 2.5
b) How is pump -setting depth determined? 1.5
c) Why is gravel packing required for a production well? 1.0

2.
a) Why is it important to study groundwater chemistry? 1.0
b) Discuss the possible chemical reactions responsible for chemical evolution of groundwater. 3.0
c) Give a classification of groundwater on the basis of the TDS. 1.0

3.
a) Briefly outline QAPP and SOP for groundwater sampling. 1.0
b) What is meant by sample preservation and how is it performed? 1.0
c) Outline data types and presentation possibilities for water chemistry data. Briefly discuss the Piper diagram with its advantages and disadvantages. 3.0

4.
a) List the major, minor, and trace constituents dissolved in groundwater. 1.0
b) Classify the sources of groundwater contamination according to the US Office of Technology Assessment 1984. 1.5
c) List various isotopes used in groundwater investigations. Briefly discuss the use of 18o and 2H in hydrogeological investigations. 2.5

5.
a) How does safe yield differ from overdraft? 1.0
b) Explain the factors that govern safe yield. 2.0
c) Discuss two methods of computing safe yield. 2.0

6. Write short notes on any FOUR of the following: 1.25 x 4 – 5.0
a) Groundwater sampling procedure
b) Types of groundwater contaminants
c) Applications of Groundwater Models
d) Prevention of saltwater intrusion in coastal aquifers
e) Groundwater development constraints in Bangladesh

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