Practice Unconfined Aquifer (36.5.3) - Groundwater Hydrology - Hydrology & Water Resources Engineering - Vol 3

Practice: Unconfined Aquifer

Lesson 36.5.3Groundwater Hydrology

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8 questions

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6 sample questions

Question 1.
What is an unconfined aquifer?
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Think about the definition based on layers of rock.
Question 2.
What does drawdown refer to?
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It's about how much lower the water level is after pumping.
3Question 3.
What is a key characteristic of unconfined aquifers?
- A. They are capped by impermeable layers.
- B. They allow gravitational drainage.
- C. They are always freshwater sources.
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Think about atmospheric pressure.
4Question 4.
True or False: The storage coefficient typically ranges from 0.1 to 0.3 in unconfined aquifers.
- True
- False
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Recall the definitions of storage coefficients.
Question 5.
A farmer extracts water from an unconfined aquifer at a rate of 150 liters per minute. The aquifer has a storage coefficient of 0.25 and average rainfall contributes 100 liters per minute back to the aquifer. Assess the sustainability of this extraction rate.
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Think about recharge versus discharge.
Question 6.
If the water table in an unconfined aquifer drops by 5 meters due to extended drought, and it previously was 15 meters deep, calculate the new water table level. Discuss the potential risks associated with prolonged drought on water resources.
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Simple subtraction reveals the new depth.

4 more questions in this section. Enroll free to practise them all.