Questions tagged [groundwater]

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15
votes
1answer
336 views

What is this strange feature on Mars in Valles Marineris

While I was browsing Mars on Google Earth, I stumbled upon an interesting feature on one of the slopes of Valles Marineris. The feature seems unique in the sense that I couldn't find any similar ...
14
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2answers
670 views

How important is understanding linear algebra in groundwater modeling?

I am considering taking a course in linear algebra and wanted to get a survey to see how important it is. My goal is not just to understand how to push the buttons in some software (e.g. GW Vistas, ...
14
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1answer
828 views

Do ringwoodite minerals point to an “ocean's worth” of water, or a true subterranean ocean?

Appears that the answer is that it is highly likely that the water that the ringwoodite minerals point to is an "ocean's worth" of water, not a true subterranean ocean. Do ringwoodite minerals ...
13
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3answers
3k views

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

The Dead Sea, rivers in California and the Aral Sea are said to be shrinking due to water usage, e.g. for agriculture. Yet the water must go somewhere. After the fields are irrigated, the water ...
13
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2answers
9k views

Do rivers/creeks flow underground when they dry up at the surface?

In my local area there is a creek which dries up completely in the summer and is flowing strongly in the winter. Is it the case that, at the location where the creek dries up, it continues flowing ...
13
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1answer
708 views

'Peak water' in the Ogallala Aquifer, USA?

According to the United States Geological Survey Report (USGS) Groundwater Depletion in the United States (1900–2008), the Ogallala Aquifer (or High Plains Aquifer) is a vital source of groundwater ...
12
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2answers
10k views

Water veins underground causing health problems

It seems to be given that around my country everybody believes in water veins (that's the best that Google Translate could come up with. Basically underground water currents) that somehow affect ...
12
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2answers
378 views

What does groundwater consist of?

I heard that groundwater is rich in minerals and fluorides, but I have no clear thoughts on what else it contains and whether the ground water differs from area to area. Can someone please shed some ...
11
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1answer
225 views

Generic pedo-transfer functions to compute field capacity and wilting point from sand/silt/clay?

I have a model (Miguez et al 2008) that defines wilting point as the soil water content below which there is no transpiration (from Johnson et al 1993). Field capacity is defined as the volume of ...
10
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2answers
120 views

Is there any link between sea-water inflitration into groundwater and nitrate?

I recently read a pop-science article about sea-water infilitration into (sweet) groundwater. One specific instance mentioned was the gaza strip: Exzessive well building and drawing of groundwater ...
9
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6answers
5k views

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

Why does depletion of underground water levels happening, if the Earth is covered by nearly 78% water, and there is also water in rivers and lakes? How can we still lack groundwater?
9
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3answers
2k views

Source of water for the Great Artesian Basin in Australia

The Great Artesian Basin in Australia covers 23% of the continent and contains 64,900 cubic kilometres of water. Many years ago it was claimed on a TV science show I saw that some of the water in the ...
9
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1answer
84 views

Groundwater unloading and corresponding changes in fault zone stick-slip behavior

I was intrigued by this Slate piece, more or less a summary of Amos et al. (2014)'s Nature article, which essentially states that groundwater depletion and subsequent crustal unloading causes a ...
8
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2answers
123 views

Measurement of groundwater levels

There are numerous measurement systems available for measuring groundwater levels (head / stage). What period of time should measurements be collected in order to draw solid conclusions about the ...
7
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2answers
1k views

How old is Earth's groundwater?

In my house, we drink the groundwater that we get from our well. It is 40 meters deep. The question is, how old is the water that we drink today? Is it from the rain 100 years ago? Another issue is, ...
7
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2answers
156 views

How is ground water mapped?

This is probably a very easy question to answer but how are the USGS maps showing ground water locations mapped? Is it a guy going around taking core samples? Or is it done using satellites and ...
7
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0answers
25 views

Would the subsurface event leading to tree death at West Tern Lake in Yellowstone be visible in thermal imaging?

The New York Times article It’s Warm and Stealthy, and It Killed Yellowstone Trees and Turned Soil Pale describes an even that took place over the past few decades where a small and well-defined ...
6
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1answer
250 views

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

I know that soil is used to filter septic systems within our treatment system, however what happens to this soil that is used in filtration, I know it would be changed every once in a while but what ...
5
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1answer
70 views

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

Water finds it way to the lowest point because of gravity. So if we dig a mine or something same, then how we take ground water in account, so that it doesn't fill in.
5
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3answers
89 views

Transferring water using underground channel

I heard in tv show, there are water channels in underground like rivers or small channels! So I just wondered why don't we use such underground water channels to recharge the underground water of one ...
5
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2answers
10k views

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

I want to understand the phenomena where water droplets after precipitation reaches to the ground. How much time does it take to become ground water or in other words how much time is taken by water ...
5
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1answer
113 views

Do Hydro-Carbon extraction units pollute ground water?

I am from India, Tamilnadu state. Our nation has planned to have hydrocarbon extraction units in our Thanjavur villages. We, a 70 million people Tamilnadu state get most of our rice from that region. ...
5
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1answer
941 views

Why confined aquifers have low storage?

Identical drop in head in unconfined and confined aquifers releases different amounts of water. The confined aquifer releases less water and thus has less specific storage. When both aquifers are ...
5
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0answers
63 views

Chloride and evaporation

I have a layered aquifer with water that contains high concentrations of calcium and sulfate (~400 mg/L Ca2+, ~1300 mg/L SO42-), at 50 cm below ground surface (bgs), 250 cm bgs and 300 cm bgs. The ...
4
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2answers
76 views

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

In a recent discussion with a farmer, the (at least in northwestern Germany) "popular" topic of nitrate infiltration into groundwater came up. The general view is that lots of fields receive more ...
4
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2answers
172 views

Can ocean temperatures affect groundwater storage capacity ?

In a paper published in Nature Geoscience (paper) the authors conclude : Declining precipitation in northern India is linked to Indian Ocean warming, suggesting a previously unrecognized ...
4
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3answers
1k views

What is meant by inverted water table?

There are some papers in literature which discuss stream-aquifer interaction. They describe that the stream aquifer interaction ranges from connection to disconnection. When there is disconnection, ...
4
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1answer
177 views

Coupling recharge with 1D groundwater flow model

Suppose we are modeling 1D groundwater flow in an aquifer of extent $x$ from $A(x=0)$ to $C$. Lets say for unsteady state conditions, the input is at $A(x=0)$, we can model piezometeric response at $B ...
4
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1answer
364 views

Why is fluid pressure in a fractured rock reservoir only dependent on hydrostatic pressure?

Why does lithostatic pressure not play a role? (or does it?)
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0answers
238 views

What is the difference between the Hydraulic diffusion equation and the Richards equation in groundwater dynamics?

What is the difference between the Hydraulic diffusion equation and the Richards equation in groundwater dynamics? I want also to understand the difference between the different storage coefficients (...
3
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3answers
712 views

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

I have been looking around at this topic recently, and it seems that it is relatively easy to determine the age of young water, by testing the concentration of anthropogenic contaminants. However, I'...
3
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1answer
852 views

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

In the diagram below, well A is an artesian well and well B is a normal well. Well B's pipe is lower than the water table. By looking at the picture, I decide that well A would try quicker than well B,...
3
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1answer
257 views

How are biological oxygen demand and depth related?

What is the relation between biological oxygen demand (BOD) and depth? I need to calculate the BOD of a drinking water tank and I have ultimate BOD at the surface of water, but I need to calculate it ...
3
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1answer
57 views

What forms do groundwater flow equations have when Dupuit supposition is not considered?

Near pumping wells or near/beneath a stream, the groundwater flow is not totally horizontal and the vertical component of groundwater movement at these points cannot be ignored in reality. Often, ...
3
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0answers
126 views

Dolomite and calcite precipitation

In an engineered wetland, there is groundwater flow from an aquifer with a chemical composition that is rich in magnesium, calcium and sulfate. We are finding that the aquifer is consistently ...
3
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0answers
2k views

Radius of Influence - groundwater pump well

What is the best method for calculating radius of influence for a pump well in an unconfined aquifer? I know the aquifer transmissivity (T), storativity (S), pump rate (Q), aquifer thickness (b), ...
3
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0answers
89 views

Does perchlorate(rocket fuel) and jet fuel make the salt and ground water near Cape Canaveral dangerous?

I've gotten into paddle surfing and I'm looking for a place to live and surf. I've been looking at an buying a condo in Cocoa Beach because of it’s proximity to Orlando and Cocoa’s decent but ...
3
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0answers
62 views

How to integrate dry wells into groundwater level mapping automatically (inequality constraints on the interpolation)?

I'm interested in automating spatial interpolation of groundwater level measurements. I'm wondering if anyone knows a method for automatically taking into account things like dry wells, where I can't ...
2
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1answer
91 views

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

I can find information about the basin as a water-source, along with photos of the ground over its 1,700,000 square km surface. But have divers ever entered this space, or tunnels been dug for cameras,...
2
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1answer
39 views

How to recharge ground water directly from river water

I am not sure if I am asking it on a correct platform or not. A rainy river passes through my village. We suffer both in summer and in rainy seasons due to this. Could anyone explain how to recharge ...
2
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1answer
44 views

What controls how quickly groundwater gets recharged from rainfall?

This is a follow up question to an earlier question I asked about how groundwater gets mapped. I have read that our groundwater is getting exhausted as people drill to deeper depths and lift ...
2
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2answers
30 views

What does a “closed basin” mean in groundwater terms?

This answer talks about a "closed basin" that has an outflow to the sea. I had previously assumed that "closed basin" meant the same as "endorheic basin", but that is obviously not the case. What is ...
2
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2answers
124 views

Searching for ground water

I would like to attempt to build a well-type structure in a woodland area. This woodland is mainly inhabited with Silver Birch and Sycamores and there is a shallow stream running down off of a ...
2
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1answer
98 views

Hydrology - Flowrate vs. radius of influence

I am using the following equation (Theim/Dupuit) to determine radius of influence for an unconfined aquifer. Assume all other variables are held constant. If Q increases, does the Radius of ...
2
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2answers
127 views

Where on Earth does paleo-groundwater exist?

Where on Earth do we expect to find very old groundwater (infiltrated thousands of years ago)?
2
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1answer
1k views

How come ZamZam water in Mecca never runs out?

It is located in the middle of a dry desert in Mecca and the astonishing thing is all wells around Mecca dried out except this one! So how can a small well, with a diameter of about 1.46 meter to 2....
2
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1answer
58 views

Does the configuration of a confined layer change the storage?

I have a confined aquifer of sand. I will temporarily drain the aquifer, remove the top one meter of the aquifer and then replace that with a layer of gravel. After that I will restore the layer (and ...
2
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1answer
461 views

Gypsum saturation index

I did some geochemical modelling and found groundwater samples I have are saturated with respect to the mineral gypsum. I need some help with interpretation, more information is given below. The ...
2
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0answers
70 views

Best material for Piezometer tube in water well

I have a 150M deep borehole. We want to measure ground water level using a pressure sensor. I believe that it is best practice to make use of a Piezometer tube ...
2
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0answers
71 views

Approaches for estimating potential evapotranspiration for non agricultural landuse classes

We are studying the water balance of a small catchment close to Jaipur, Rajasthan India in a semiarid climate. About a quarter of the landuse within the catchment is agriculture, the rest is divided ...