This set of Engineering Hydrology Multiple Choice Questions & Answers (MCQs) focuses on “Groundwater Resource”.
1. Which of the following is not a signal for unsafe yield from an aquifer?
a) Salt water encroachment
b) Temporary lowering of water table
c) Exceedance of maximum drawdown
d) Inefficient operation of wells
View Answer
Explanation: When the yield form an aquifer crosses the safe yield, the following undesirable observations are made – permanent lowering of water table, exceedance of maximum drawdown, inefficient well operation and salt water intrusion (coastal aquifers).
2. Mining of groundwater is concerned with the depletion of which of the following?
a) Dynamic resource
b) Static resource
c) Dynamic and static resource
d) Water table
View Answer
Explanation: Mining implies the permanent removal of groundwater from storage by completely depleting the static groundwater resource available in the pores of the aquifer.
3. Which of the following is true with respect to groundwater resources?
a) Static resource represents the safe yield
b) Dynamic resource is available in the pores of the aquifer
c) Static resource is replenishable
d) Static resource is larger than the dynamic resource
View Answer
Explanation: Dynamic resource represents the safe yield whereas the static resource represents the water stuck in the pores of the formation. Dynamic resource can be replenished but static resource is non-replenishable. The static resource is much larger than the dynamic resource.
4. Which of the following is not a method of groundwater loss from aquifers?
a) Deep percolation
b) Outflow to rivers
c) Transpiration
d) Evaporation of water table
View Answer
Explanation: Deep percolation especially from irrigated areas is a way of groundwater recharge. The losses from groundwater can occur in the form of transpiration, evaporation and outflow to rivers and streams.
5. The groundwater development in an area is classified based on which of the following?
a) Stage of groundwater development
b) Long term trend of pre and post-monsoon groundwater levels
c) Extent of area and long term trend of pre and post-monsoon groundwater levels
d) Stage of groundwater development and long term trend of pre and post-monsoon groundwater levels
View Answer
Explanation: The groundwater development in an area is divided into four categories based on two main criteria – stage of groundwater development and long term trend of pre and post-monsoon groundwater levels.
6. The stage of groundwater development of an area is at 85% and the long term decline of pre and post-monsoon groundwater levels for the area is significant. What category of groundwater development does the area belong to?
a) Safe
b) Semi-critical
c) Critical
d) Over-exploited
View Answer
Explanation: For the stage of development of 70 to 90%, the long term decline of pre and post-monsoon levels is significant and this area is categorized as semi-critical zone of groundwater development.
7. Which of the following percentages of groundwater development suggest a critical area of groundwater development?
a) < 85%
b) 85-90%
c) 95-100%
d) > 100%
View Answer
Explanation: If the percentage of groundwater development is at the stage of 90 to 100%, this suggests that the area is a critical zone in terms of groundwater development.
8. How many measurements are taken per annum by the Central Groundwater Board from the from the selected network of dug wells?
a) 2
b) 4
c) 6
d) 8
View Answer
Explanation: Water level measurements are taken four times in a year in the months of January, April, August and November.
9. How many times in a year does the Central Groundwater Board collect water samples from the well network?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: Groundwater samples are collected only once a year in the measurement month of April/May. These samples are sent for chemical analysis.
Sanfoundry Global Education & Learning Series – Engineering Hydrology.
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