Questions tagged [groundwater]
The groundwater tag has no usage guidance.
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What is the "healthiest" rock?
When talking about rocks, i.e. an aggregate of minerals, which type would be the "healthiest"
I'm not talking about some voodoo crystal-healing stuff here, just if there is any rock ...
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0answers
26 views
Water flows under the headwater and soil liquefaction has formed
A retaining wall 40 cm thick with variable height (thin-walled corner) is being built in the mountainous area. At the time of the geotechnical survey and design, there was no reservoir next to the ...
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1answer
95 views
How likely is it for coastal cities to survive next 40 years? [closed]
I live in a coastal city myself and I know there are many measures taken to prevent harm for city buildings from sea waters. I'm not aware of all of them and I wonder if modern cities actually have a ...
2
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1answer
86 views
What is this geographical feature? (as seen in maps)
Can someone help me identify this peculiar geographical feature I've noticed in satellite imagery?
This particular screenshot is from satellite imagery of northern Russia, however this kind of ...
6
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2answers
237 views
Why should there not be water deep (e.g. below 6 kms) in the Earth's crust?
In 1970, the USSR began drilling at the Kola Super-deep Borehole. The target depth was 15,000 meters;
The stated areas of study were the deep structure of the Baltic Shield, seismic discontinuities ...
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1answer
61 views
Is VLF-EM scanning for fractures a valid way to find groundwater for a well?
I posted this question on Engineering Stack Exchange as well. I'm not sure if here or there is the better place. There is no agriculture stack exchange (much as I wish there was) so I am posting there ...
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63 views
How much does the weight of urban structures (buildings) affect the compaction (permeability, porosity, density) of alluvial sediments below a city?
I live in Van, Turkey. Van City is situated on an alluvial plain beside Lake Van. General geological structure of the area can be seen on pages 43-44 in this conference book. One of the images is ...
6
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2answers
872 views
What is the name of this landform?
These are from the movie Insomnia.
Also available in this video from 4 seconds to 8 seconds. What is the name of this landform? Are these just snow on Lapies? or These are some form of glaciated ...
6
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1answer
149 views
Does Antarctica have a lot of aquifers?
I got to thinking about freshwater on Antarctica. Obviously, there is a lot of freshwater ice. However, the deeper you go underground, eventually the dirt will be warmed geothermically. So does the ...
4
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3answers
182 views
How is land subsidence measured?
When groundwater is pumped out of the ground by wells, and not replenished fast enough, the groundwater level sinks.
With it, the surface of the area sinks also. Locally, this effect is not apparent,...
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2answers
93 views
Estimation on how cold will my pond get - intent is to know if certain fish can survive in it
I want to get an estimate on how cold my pond will get.
It is a 1 acre pond in Central Florida USA. It has an average depth of 4 feet. There is not much circulation in the pond. It gets direct ...
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2answers
234 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 ...
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1answer
65 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 ...
6
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2answers
181 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.
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1answer
63 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 ...
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1answer
192 views
What effect does concretization (paving/flooring with concrete) has on ground water table
I am a newbie for hydrology. If the question seems to have "well known answer", I appreciate if you point me to the resources. I will add details to the question based on comments.
Consider a town of ...
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0answers
24 views
The DRASTIC groundwater vulnerability model and it's relevance today
I am reading a groundwater pollution vulnerability study by Mark Angle of the Ohio Dpet. of Natural Resources (ODNR) for my county. The model used to assess the groundwater vulnerability for the ...
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3answers
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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 ...
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1answer
510 views
What is the cause of temporary smell and black color of underground water?
We have a well (about 1200KM away from sea and 60 meter deep), the water when taken out has slightly dark color and has smell. But strangely in about 12 hours the smell and black color vanishes and ...
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2answers
1k views
Why do we consider hydrostatic pressure and lithostatic pressure separately?
In petroleum geology, why do we consider hydrostatic pressure and lithostatic pressure separately?
Surely the pressure at any point, whether fluid or rock, at depth is simply equal the weight of all ...
2
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1answer
60 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 ...
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3answers
109 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 ...
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2answers
137 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
207 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 ...
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2answers
84 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 ...
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1answer
721 views
Concept of artesian aquifers and pressure is not clear.
I do not understand how the Artesian aquifer is causing the water in the flowing well to reach a level higher than the ground surface? And what role does the piezometric surface play in it?
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1answer
48 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 ...
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2answers
188 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 ...
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1answer
472 views
Can a microGPS tracker trace the path of an underwater drainage conduit?
The Devil's Kettle is a pothole in the rock where a small river disappears underground in the Judge C.R. Magney State Park in Minnesota. Would it be possible to trace the path of the drainage conduit ...
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0answers
86 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 ...
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0answers
90 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 ...
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0answers
71 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 ...
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54 views
Pyrite oxidation
How much pyrite has to be oxidized to produce a sulfate concentration of 15 mM?
If the solution initially has a pH of 8, roughly what would the pH drop to if there is no buffering of acidity?
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24 views
What models are available to estimate effect of surface water on groundwater quality?
I want to determine the effect of surface water quality or the effect of chemicals used on surface like fertilizers on groundwater. What choices do I have for predicting groundwater quality? What are ...
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0answers
146 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 ...
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2answers
243 views
Limitations on mineral precipitation from solution
If the solubility constant for a mineral is exceeded and, thermodynamically, a mineral is favored to precipitate in solution, are there any factors that may limit this from happening? Perhaps kinetics?...
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1answer
853 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 ...
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2answers
141 views
Where on Earth does paleo-groundwater exist?
Where on Earth do we expect to find very old groundwater (infiltrated thousands of years ago)?
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60 views
Modelling the unsaturated zone in FeFlow in seawater intrusion scenarios
Does anyone have experience with modelling seawater intrusion scenarios in Feflow?
In my models, my mass-concentration seems to drive up into the unsaturated vadose zone, which I don't believe is ...
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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), ...
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1answer
588 views
Hydrology - Depression cone VS transmissivity
My question concerns the depression cone of a pumping well in a confined aquifer: Say the transmissivity of the aquifer is 1200 m^2/day how will the cone change if the transmissivity is 600 m^2/day? ...
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3answers
2k 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, ...
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1answer
60 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, ...
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1answer
202 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 ...
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271 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 (...
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1answer
2k 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....
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0answers
454 views
Linear Boussinesq Equation for groundwater flow in inconfined aquifer?
I was reading a paper (equation 1 in linked paper) where they used 'linearized Boussinesq' equation to model groundwater in unconfined aquifer. The linearized Boussinesq equation described in the ...
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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, ...
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1answer
179 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,...
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6answers
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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?