# CE6008 Groundwater Engineering Nov Dec 2016 Important Questions

Important questions / expected questions for Nov Dec 2016 CE6008 Groundwater Engineering-I examinations conducting by Anna University Chennai
B.E./ B.Tech. DEGREE EXAMINATION Nov Dec 2016
07th Semester / Seventh Semester / Final Year
Civil Engineering
CE6008 Groundwater Engineering
(Regulation 2013)
Nov Dec 2016 Important Questions

Important 16 Marks Questions with answers (All five units) are listed for CE6008 Groundwater Engineering Subject

2. During Hydro geological investigation two potential aquifers 32 km apart , were located ,one being 5000 years and the other 25000years old. They were found to be connected by a water bearing stratum of 30m thickness running inclined at 20m/km. From a few observation wells, the hydraulic gradient was found to be 0.2m/km. Determine the transmissibility of the water bearing stratum.

3. i) During Groundwater Investigation in the Cauvery basin the following data were collected. (6)
Recharge area identified - 19 x 13 km
Annual Rainfall - 1070mm
Infiltration - 20% of rainfall
Transmissibility of aquifer- 6 x 10^6 lpd/m
Width of aquifer -21 km
It has to be ascertained whether all the pumpage comes from the recharge area.(6)
ii) Write about water table contour map and Flow net analysis. (10)

4. (i) Describe about Groundwater movement. (10)
(ii) Explain about the land subsidence due to Groundwater withdrawals. (6)

5. i) Explain about Groundwater development potential in India. (12)
ii) Write the groundwater balance equation. (4)

6. A 30 cm well penetrates 50 m below static water table. After a long period of pumping at a rate of 1800 lpm , the drawdown in the well at 15 m and 45 m from the pumped well where 1.7 and 0.8 m respectively. Determine transmissibility of the aquifer. What is the draw down ?

i Jacob method (5)
ii Slug test (5)
iii Theis method (6)

8. Write in detail about partial penetration of wells

9. An unconfined aquifer with a specific yield of 0.20 is used to supply water for the irrigation of farm land. The recharge area of the aquifer is same as the irrigated area. The recharge is limited to 76 mm per year. The saturated thickness of the aquifer -is 15.2 m. How many years will the water supply
last if 254 mm of water per year is pumped from the aquifer for irrigation?

10. A 60 cm well is being pumped at a rate of 1360 litres per minute. At a distance of 6 m from the well being pumped, the draw down was 6m and at 15 m the draw down was 1.5 m. The bottom of the well is 90 m below the groundwater table,(a) Find out K, (b)lf all the observed points were on the
Dupuit's curve, what was the draw down in the well during pumping.? What is the specific capacity of the well? What is the rate at which water can be drawn from this well?

11. Why do we need modeling studies? Explain. (4)
Explain predictive , Interpretive and generic type models. (7)
Explain the model conceptualization. (5)

12. Explain the model selected to perform the task.
(i) Analytical model. (8)
(ii) Numerical model. (8)

i) Hydrogeological modeling and Boundary condition (4)
(ii) Groundwater flow equation used (4)
(iii) Software used to model and model design (4)
(iv) Model calibration. (4)

14. Explain GALDIT Method to evaluate the system vulnerability and ranking.

15. Identify and Explain the model selected to perform the task.
i. One dimensional model. (5)
ii. Two dimensional models. (5)
iii. Three dimensional models.(6)

16. What are the factors influencing the composition of groundwater

17. i. Write the remediation measures for saline intrusion?
ii. Write a case study about saline intrusion remediation?

18. (i) Discuss the effect of tsunami in the movement of saltwater intrusion. (6)
(ii) Illustrate the various graphical methods used for representing the water quality parameters (10)

19. Explain industrial and agricultural sources of groundwater pollution and their effects on water quality with neat flow chart.

21. (i) Why groundwater conservation is important in these days?
(ii) What do you mean by effective pumping and write its advantages ?

22. (i)Write about the various recharge structures available for artificial recharge. (8)
(ii) Under what circumstances a particular recharge structure is selected for the region? (8)

23. How do you technically determine the impact of an artificial recharge structure? (16)

24. (i)What are the causes for groundwater pollution? (8)
(ii) Enumerate the effects of groundwater pollution on humans and agriculture. (8)

25. Write in detail about groundwater legislation (16)

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