Engineering Hydrology Questions and Answers – Forms of Subsurface Water

This set of Engineering Hydrology Multiple Choice Questions & Answers (MCQs) focuses on “Forms of Subsurface Water”.

1. How many primary zones is the subsurface water divided into?
a) 2
b) 3
c) 4
d) 5
View Answer

Answer: a
Explanation: The water stored below the land surface is known as subsurface water. It is mainly divided into two zones, namely the zone of saturation and above it, the zone of aeration.

2. What is the zone of water present below the ground water table known as?
a) Soil water zone
b) Aeration zone
c) Unconfined zone
d) Groundwater zone
View Answer

Answer: d
Explanation: Below the water table in a soil, all the pores of the soil are saturated with water and is known as the zone of saturation. It is also referred to as the groundwater zone.

3. Identify all the subzones in the zone of aeration of a soil mass.
a) Soil water zone and capillary fringe
b) Soil water zone, capillary fringe and groundwater zone
c) Capillary fringe, intermediate zone and groundwater zone
d) Soil water zone, intermediate zone and capillary fringe
View Answer

Answer: d
Explanation: The zone of aeration lies above the water table and the soil pores are partially filled with water. It is divided into three subzone, namely the soil water zone, intermediate zone and capillary fringe.

4. Identify the correct statement regarding the zones of subsurface water.
a) Capillary fringe lies below the saturated zone
b) Soil water zone and saturated zone are separated by the water table
c) Capillary fringe lies just above the water table
d) Intermediate zone is present between the capillary fringe and groundwater zone
View Answer

Answer: c
Explanation: Starting from the top, the subsurface water has the zone of aeration which consists of soil water zone, intermediate zone and capillary fringe. This is followed by the water table below which the completely saturated groundwater zone exists upto the bedrock.

5. Which of the following is not true with regards to aquitard?
a) Permeable
b) Very high yield
c) Seepage possible
d) Leaks water
View Answer

Answer: b
Explanation: An aquitard is type of saturated geological formation which permits the seepage of water. However, it is only partly permeable and yields water in very little amount. Over time, it may leak sufficient quantities of water to an underlying aquifer.

6. Four different geological formations of equal thickness are present in a soil below water table. Which of the following formations will give the maximum yield of water?
a) Aquifer
b) Aquiclude
c) Aquifuge
d) Aquitard
View Answer

Answer: a
Explanation: An aquifer is a saturated formation that is both porous and highly permeable. It stores water and also yields it in a very high amount.

7. Which of the following deposits of same thickness will give the least yield of water?
a) Unconsolidated gravel
b) Consolidated clay
c) Unconsolidated sand
d) Consolidated gravel
View Answer

Answer: b
Explanation: Deposits of unconsolidated sand and gravel examples of aquifers as they have many pores and high permeability. Clay, especially unconsolidated, in an example of an impermeable deposit which can hold water but cannot transmit it.

8. A thick uncracked granite deposit is an example of an aquifuge.
a) True
b) False
View Answer

Answer: a
Explanation: An aquifuge is a formation which cannot store any water and neither has the ability to transmit it. It is completely impermeable with no interconnected openings. Hence, an uncracked granite formation is an aquifuge.

Sanfoundry Global Education & Learning Series – Engineering Hydrology.


To practice all areas of Engineering Hydrology, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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