Question 1 of 6
Basic

Initially, water is driven underground by gravity. What is the main driver after a certain depth?

Question 2 of 6
Basic

Can groundwater be over a thousand years old?

Question 3 of 6
Basic

What happens if groundwater is depleted too fast?

Question 4 of 6
Basic

What do we call the visible area from which the aquifer gets new water over time?

Question 5 of 6
Basic

Why do people favour groundwater to surface water sources?

Question 6 of 6
Basic

In the example given in the course, how many years will it take potentially for the effects of surface pollution to show up in drinking water?

Question 6 of 6
Basic

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1: Initially, water is driven underground by gravity. What is the main driver after a certain depth?
The main driver becomes pressure
1: Initially, water is driven underground by gravity. What is the main driver after a certain depth?
The main driver is still gravity
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1: Initially, water is driven underground by gravity. What is the main driver after a certain depth?
Both pressure and gravity, depending on conditions
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2: Can groundwater be over a thousand years old?
No
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2: Can groundwater be over a thousand years old?
Yes
3: What happens if groundwater is depleted too fast?
The land subsides and a shallow lake forms
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3: What happens if groundwater is depleted too fast?
The land subsides and dries out
3: What happens if groundwater is depleted too fast?
Water pressure drops, but in principle the aquifer is always there
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4: What do we call the visible area from which the aquifer gets new water over time?
Surface water source
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4: What do we call the visible area from which the aquifer gets new water over time?
The recharge area
4: What do we call the visible area from which the aquifer gets new water over time?
The watershed
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5: Why do people favour groundwater to surface water sources?
Access to surface water is often limited for many due to land ownership
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5: Why do people favour groundwater to surface water sources?
They don't - lakes and rivers provide a much more reliable supply
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5: Why do people favour groundwater to surface water sources?
The cleaning effect from filtration through the subsurface makes groundwater much safer
6: In the example given in the course, how many years will it take potentially for the effects of surface pollution to show up in drinking water?
4 to 5 years
6: In the example given in the course, how many years will it take potentially for the effects of surface pollution to show up in drinking water?
Over a thousand years
6: In the example given in the course, how many years will it take potentially for the effects of surface pollution to show up in drinking water?
40 to 50 years