28 votes

How can we have groundwater depletion when the Earth is 78% covered with oceans?

How can we still lack groundwater? That 71% of the Earth's surface is covered by oceans is completely irrelevant to the issue of fresh groundwater depletion. Salty groundwater is useless for drinking ...
David Hammen's user avatar
  • 23.1k
16 votes

How is it possible to use up the water in a region?

This is a really complex problem and would require a really detailed explanation about atmospheric circulation, meteorology and hydrology. The short answer to your question is that water is going ...
Nemesi's user avatar
  • 1,258
15 votes
Accepted

Ground water is almost every where, then how do mines and other holes are digged so that ground water doesn't drain into it

We pump it out. Open and closed pit mines usually have pumping installations to get the water out. Look up Mine dewatering on Wikipedia. There have also been numerous accidents in the past where ...
Jan Doggen's user avatar
  • 2,679
14 votes
Accepted

How is it possible to use up the water in a region?

You're making a mistake, at least for the second case: In the second case, the water ends up as rain, presumably within a few hundred kilometers of the evaporation point. You cannot model a dry ...
gerrit's user avatar
  • 11.6k
13 votes

Is it possible that the recent droughts are signs of epic crust failure?

Is it possible that the recent droughts are signs of epic crust failure? No. Even though your 5 points do not make much sense, I'll try to answer it anyway. There are no continental plates. There ...
Gimelist's user avatar
  • 23.1k
12 votes
Accepted

What is the name of this landform?

This is a large glacier calving event. Calving occur at the front of the glacier, probably a very wet (and likely warm based) glacier where a considerable amount of water is flowing out of the system (...
marsisalie's user avatar
  • 2,633
8 votes
Accepted

Why does an artesian well dry slower than a normal well?

Well B is a normal water table well, which will have a relatively steep, tight, local, and deep 'cone of depression'. Well A doesn't have a 'cone of depression' - it has a 'cone of depressurization', ...
Gordon Stanger's user avatar
7 votes

How old is Earth's groundwater?

The age of groundwater can vary over a large span. The moment a drop of rain enters the ground it becomes groundwater and when it reaches the groundwater table, the water starts to flow towards a ...
user2821's user avatar
  • 5,936
7 votes
Accepted

Has anyone driven under, or received camera footage from, the Great Artesian Basin in Australia?

Groundwater is stored in the porosity of rocks, that is space between clasts or cracks. Larger cavities, e.g. karsts, is usually only a minor contribution to ground water reservoirs and are only ...
user2821's user avatar
  • 5,936
7 votes
Accepted

Can a microGPS tracker trace the path of an underwater drainage conduit?

GPS units require a clear view of the sky to fix their position. Because unlike radio signals used for communications, once the GPS signal have bounced in a wall becomes useless for computing the ...
Camilo Rada's user avatar
  • 17.6k
7 votes

How to recharge ground water directly from river water

The solution you are looking for is called "artificial recharge of aquifers" or "managed underground storage of recoverable water", among several other names. Several different ...
tanius's user avatar
  • 171
6 votes
Accepted

How do you determine the age of >60 year old water?

According to this pdf: Physikalische Grundlagen der Klimaarchive Eis und Grundwasser (mostly German - some English) all methods to determine the age of groundwater bodies older than ~60 years are ...
klanomath's user avatar
  • 295
6 votes
Accepted

What would happen if the same soil received waste water contaminants for a long time?

Like many things in Earth Science, the answer is, "It depends." In this case it depends on the composition of the soil and the contaminant you are talking about. Climate, particularly the amount of ...
haresfur's user avatar
  • 4,429
6 votes
Accepted

Concept of artesian aquifers and pressure is not clear.

The red line or piezometric line is the level to which the water wants to rise - if it were allowed to reach hydrostatic equilibrium. Artesian conditions are anywhere where a confined aquifer sits ...
potatasbravas's user avatar
6 votes

Can pumping water into the aquifiers reverse the sinking of cities like Jakarta?

Subsidence in environments like Jakarta has several causes, as described in Abidin et al, 2015. Natural processes of compaction of relatively 'young' alluvial soils under their own weight Loading due ...
Andy M's user avatar
  • 2,010
5 votes

What is meant by inverted water table?

An Inverted or Perched water table is a water table that is above the main or regional water table in an unconfined aquifer. The perched water table is generally above a layer of low permeability ...
Earth Science Expatriate's user avatar
5 votes

How old is Earth's groundwater?

Groundwater ages vary enormously across the globe and with depth: from hours in parts of Florida and areas with Karstic geology, to tens of thousands of years in the American breadbasket, all the way ...
Knob Scratcher's user avatar
5 votes

How do you determine the age of >60 year old water?

Klanomath is technically correct regarding natural radionuclides, although in practical terms it is only radiocarbon and 36-Cl that are used to date water. Tritium, from atom bomb tests in the 1950s ...
Gordon Stanger's user avatar
4 votes

How can we have groundwater depletion when the Earth is 78% covered with oceans?

Groundwater is formed from precipitation of rain into the ground. It flows towards the oceans through the soil as the oceans have a lower surface. Often it flows into river and lakes on the way. If ...
user2821's user avatar
  • 5,936
4 votes
Accepted

How much time does water takes to reach to the ground?

It depends upon the hydraulic conductivity, the degree of saturation, and the depth to water table. Generally, water seeping down in the unsaturated zone moves very slowly. Assuming a typical depth to ...
Gordon Stanger's user avatar
4 votes

How to recharge ground water directly from river water

What you are asking about is called "Managed Aquifer Recharge" It has been successfully employed in some situations but depends greatly on the geology of the area. The aquifer needs to be relatively ...
haresfur's user avatar
  • 4,429
4 votes
Accepted

Does Antarctica have a lot of aquifers?

Yes. So far as aquifers are concerned, Antarctica is just like any other continent. The Ice is 4 kilometres thick in places, but at the bottom there is water. If there is any place where water is not ...
Michael Walsby's user avatar
4 votes
Accepted

Why should there not be water deep (e.g. below 6 kms) in the Earth's crust?

There are two reasons for this surprising finding: Compaction. Once you have high pressures at depth, the less dense material goes up. Take a bucket of water, put sand in it, and squeeze the sand ...
Gimelist's user avatar
  • 23.1k
3 votes
Accepted

Hydrology - Depression cone VS transmissivity

Based on the Theis equation, increasing the transmissivity will increase the radius of influence and decrease the total drawdown. Drawdown is directly proportional to the pumping rate and inversely ...
Inkenbrandt's user avatar
  • 1,035
3 votes

How much time does water takes to reach to the ground?

Your question is difficult to answer because many factors will affect ground water recharge: Soil porosity, which will be affected by soil pore space volumes, soil cohesion (the distribution of clay &...
Fred's user avatar
  • 24.6k
3 votes

Do Hydro-Carbon extraction units pollute ground water?

The types of hydrocarbon extracted from the ground ranges from gas to crude oil and bitumen. Each deposit of hydrocarbon is different; some are all gas whereas others are various types of crude oil or ...
Fred's user avatar
  • 24.6k
3 votes

Can ocean temperatures affect groundwater storage capacity ?

I think the abstract of the article addresses your question. Working backwards, it presents two direct causes of change in groundwater storage. The first is climatic - greater precipitation tends to ...
haresfur's user avatar
  • 4,429
3 votes

How do you determine the age of >60 year old water?

The 'age' of groundwater is typically taken to mean the time since the water became isolated from the atmosphere. Tritium is still be used since it is produced in the atmosphere in small amounts and ...
haresfur's user avatar
  • 4,429
3 votes

What controls how quickly groundwater gets recharged from rainfall?

What controls how quickly they refill with rainwater? Really it depends on where the aquifer is. Letting rain top off a Hawaiian aquifer may take a few weeks. However, refilling the aquifer beneath ...
Knob Scratcher's user avatar
3 votes

Does nitrate take a particular long time to percolate from surface into groundwater?

I know in New Zealand we have a number of soils you can't raise dairy herds on because the nitrate in their urine strips too many nutrients too fast, to the point where one can tell where the cow ...
Ash's user avatar
  • 4,260

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