<p>It depends on the size of the aquifer and the amount of precipitation falling on the exposed areas of the aquifer. These have been used to provide water form many major cities.<br><br>
The Trafalgar square fountains were initially powered by artesian pressure (as London is below the altitude of the North downs / Chilterns). Eventully too much water was extracted leading to salt water incursions in places. This aquifer is still in use but backed up by a number of surface reservoirs surrounding the London area.</p>

<p><i>"
The Report of the Royal Commission on Water Supply (1869) shows that, by 1869, a number of large conurbations were supplied by groundwater. Nottingham and parts of Liverpool and Birkenhead relied on wells in the Permo-Triassic sandstones, Sunderland and South Shields on the Permian Magnesian Limestone and Croydon and parts of south east London on the Chalk. Government offices around Westminster together with the fountains in Trafalgar Square were supplied by wells sunk to the Chalk in 1844 (Amos, 1860).
"</i></p>

<p>More from here <a href="http://www.groundwateruk.org/British-Hydrogeology-a-brief-history.aspx" rel="nofollow noreferrer">http://www.groundwateruk.org/British-Hydrogeology-a-brief-history.aspx</a></p>

<p>More detail on the London aquifer:
 <a href="https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/735451/2018_Final.pdf" rel="nofollow noreferrer">https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/735451/2018_Final.pdf</a></p>

CC BY-SA 4.0
2019-10-03T13:36:50.530Z
Does that source have any estimations of the sizes of the sources they drew from? I can't see any. Since lots of different sources I don't know individually how large they are.
Nepene Nep
CC BY-SA 4.0
2019-10-03T14:30:30.550Z
@NepeneNep. I've update my answer with a link to details of the London aquifer
MiguelH
CC BY-SA 4.0
2019-10-03T13:23:23.723Z
2019-10-03T14:29:44.837Z
2019-10-03T14:29:44.837Z
MiguelH
<p>How much water does a typical aquifer contain, and is casual well use is likely to deplete them?</p>

<p>Your answer can take many forms, but an ideal question would cover these sort of areas- would a single well that someone took 50 liters from a day deplete one? Do you need industrial use of hundreds of meters cubed? Typically how vulnerable are they to depletion by people. Is there a lot of variability in size, or are they usually fairly large? Does it take months, years, decades?</p>

<p>Inspired by Mad Max, where there is a large mountain aquifer supplying a couple hundred people and I have no idea how long it would take to deplete.</p>

<p>Previous questions have covered this in vague terms but haven't given a general picture of what it's like for people in general, especially in more remote areas where they may not have access to the largest of aquifers, which apparently can last decades. I'm more curious what it's like for a random farmer.</p>

CC BY-SA 4.0
2019-10-03T13:18:53.277Z
It depends on the size of the aquifer and the amount of precipitation falling on the exposed areas of the aquifer. These have been used to provide water form many major cities.
MiguelH
CC BY-SA 4.0
2019-10-03T13:20:47.150Z
Yeah. So some can supply entire cities. Is that normal for aquifers? I have no idea. Hence the question.
Nepene Nep
CC BY-SA 4.0
2019-10-03T13:26:00.357Z
Sorry I started typing the answer as a comment. I can remove the comment it if you like!
MiguelH
CC BY-SA 4.0
2019-10-03T13:40:42.087Z
The largest aquifer is the Great [Artesian  Basin in Australia](https://en.wikipedia.org/wiki/Great_Artesian_Basin) which is over 1 700 000 square kilometers & covers 22% of the continent. It is estimated to contain 64 900 cubic kilometers of water.
Fred
<human-influence><water-table><underground-water><watershed>
How much water do aquifers contain? How much does it take to deplete them?
Nepene Nep
# How much water do aquifers contain? How much does it take to deplete them?

(Asked by: username_0 on 2019-10-03)

How much water does a typical aquifer contain, and is casual well use is likely to deplete them?

Your answer can take many forms, but an ideal question would cover these sort of areas- would a single well that someone took 50 liters from a day deplete one? Do you need industrial use of hundreds of meters cubed? Typically how vulnerable are they to depletion by people. Is there a lot of variability in size, or are they usually fairly large? Does it take months, years, decades?

Inspired by Mad Max, where there is a large mountain aquifer supplying a couple hundred people and I have no idea how long it would take to deplete.

Previous questions have covered this in vague terms but haven't given a general picture of what it's like for people in general, especially in more remote areas where they may not have access to the largest of aquifers, which apparently can last decades. I'm more curious what it's like for a random farmer.

**Tags:** human-influence, water-table, underground-water, watershed

> **Comments:**
> **username_1**: It depends on the size of the aquifer and the amount of precipitation falling on the exposed areas of the aquifer. These have been used to provide water form many major cities.  
> **username_0**: Yeah. So some can supply entire cities. Is that normal for aquifers? I have no idea. Hence the question.  
> **username_1**: Sorry I started typing the answer as a comment. I can remove the comment it if you like!  
> **username_2**: The largest aquifer is the Great [Artesian  Basin in Australia](https://en.wikipedia.org/wiki/Great_Artesian_Basin) which is over 1 700 000 square kilometers & covers 22% of the continent. It is estimated to contain 64 900 cubic kilometers of water.  

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## 1 answers

### Answer by username_1 on 2019-10-03. Score: 1 | Accepted answer

It depends on the size of the aquifer and the amount of precipitation falling on the exposed areas of the aquifer. These have been used to provide water form many major cities.  
  
The Trafalgar square fountains were initially powered by artesian pressure (as London is below the altitude of the North downs / Chilterns). Eventully too much water was extracted leading to salt water incursions in places. This aquifer is still in use but backed up by a number of surface reservoirs surrounding the London area.

*"
The Report of the Royal Commission on Water Supply (1869) shows that, by 1869, a number of large conurbations were supplied by groundwater. Nottingham and parts of Liverpool and Birkenhead relied on wells in the Permo-Triassic sandstones, Sunderland and South Shields on the Permian Magnesian Limestone and Croydon and parts of south east London on the Chalk. Government offices around Westminster together with the fountains in Trafalgar Square were supplied by wells sunk to the Chalk in 1844 (Amos, 1860).
"*

More from here <http://www.groundwateruk.org/British-Hydrogeology-a-brief-history.aspx>

More detail on the London aquifer:
<https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/735451/2018_Final.pdf>

> **Comments:**
> **username_0**: Does that source have any estimations of the sizes of the sources they drew from? I can't see any. Since lots of different sources I don't know individually how large they are.  
> **username_1**: @username_0. I've update my answer with a link to details of the London aquifer  

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