Questions tagged [groundwater]
The groundwater tag has no usage guidance.
86
questions
1
vote
1
answer
89
views
How to find the drawdown of a well in an unconfined aquifer?
I tried to calculate the dropdown of a well of an unconfined aquifer but the drawdown of an observation well is not given. Here's the full question:
A 10 cm diameter well in an unconfined aquifer was ...
2
votes
1
answer
96
views
How much water does the Earth contain?
I am curious about how various estimates can divert. The first picture is taken from a recent publication of VisualCapitalist
https://www.visualcapitalist.com/sp/hf01-visualizing-all-of-the-worlds-...
- 21
0
votes
1
answer
247
views
Why the groundwater depth is different in same area
I recently measured groundwater levels using a tape in three different boreholes for where the holes are in same area. Each hole had a different level of water. Holes A and B are just 4 meters apart ...
- 39
0
votes
1
answer
107
views
How far should a Manganese processing plant be built from a city?
Land that is currently zoned as agriculture with houses and businesses surrounding it is being proposed to be changed to commercial/industrial. The purpose is to build a Manganese processing plant. ...
3
votes
0
answers
25
views
Can single point value for potential water-logging be calculated using soil particle size, organic matter and bulk density
I am studying the recent paludification (e.g. mineral soil forests turning to peatlands) in a boreal regime. I have collected peat samples from the peat/mineral subsoil contact that have been 14C ...
1
vote
0
answers
28
views
MIKE SHE Lateral inflow outputs and the differences between them
There are four 'Lateral inflow' related variables coming out from the .res1d file
Lateral inflow SHE overland
Lateral inflow SHE saturated zone
Lateral inflow SHE overland drain
Lateral inflow SHE ...
3
votes
0
answers
55
views
Approximating Soil Moisture level
Are there any simple models to approximate soil moisture level (%) as a function of distance from a waterbody (say a lake)? If one assigns saturation level of lake to 100% , then are there any ...
- 121
2
votes
0
answers
34
views
Factors influencing existence of groundwater
I'm going to use RS/GIS techniques and an Analytic Hierarchy Process (AHP) to identify potential groundwater zones , but first I need to identify all factors influencing the existence of groundwater. ...
- 21
1
vote
0
answers
56
views
I perceive fuel in my bore hole water
Since I am from the Niger delta, where crude oil is mostly seen ... when we pump water and I try drinking it, it reeks of fuel ... how can I confirm it to be crude locally before alerting the oil ...
- 11
4
votes
1
answer
235
views
Can pumping water into the aquifiers reverse the sinking of cities like Jakarta?
Indonesia decided to relocate the capital, in part due to environmental struggles facing Jakarta:
one of the fastest sinking cities in the world due to the over extraction of groundwater
Source: ...
- 188
2
votes
1
answer
207
views
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 ...
- 21
3
votes
0
answers
29
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 ...
1
vote
1
answer
101
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 ...
- 111
3
votes
1
answer
115
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 ...
- 133
7
votes
2
answers
840
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 ...
- 173
3
votes
1
answer
159
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 ...
1
vote
2
answers
80
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 ...
- 95
7
votes
2
answers
902
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 ...
- 345
6
votes
1
answer
197
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 ...
- 163
5
votes
4
answers
565
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,...
- 679
2
votes
2
answers
758
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 ...
2
votes
2
answers
547
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 ...
- 5,810
4
votes
3
answers
291
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 ...
The PowerHouse
6
votes
2
answers
1k
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.
- 163
8
votes
1
answer
76
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 ...
- 6,904
1
vote
1
answer
310
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 ...
- 111
1
vote
0
answers
27
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 ...
- 183
13
votes
3
answers
4k
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 ...
- 233
1
vote
1
answer
1k
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 ...
- 113
3
votes
2
answers
2k
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 ...
- 31
2
votes
1
answer
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 ...
- 21
5
votes
3
answers
170
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 ...
- 151
2
votes
2
answers
158
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 ...
- 21
2
votes
1
answer
412
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 ...
- 21
4
votes
2
answers
127
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 ...
- 1,244
1
vote
1
answer
1k
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?
2
votes
1
answer
180
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 ...
- 191
7
votes
2
answers
224
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 ...
- 191
1
vote
1
answer
508
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 ...
- 113
3
votes
0
answers
94
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 ...
- 131
3
votes
0
answers
97
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 ...
- 283
6
votes
0
answers
74
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 ...
- 111
1
vote
0
answers
58
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?
- 123
1
vote
0
answers
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 ...
- 779
4
votes
0
answers
156
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 ...
- 111
1
vote
2
answers
438
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?...
- 123
2
votes
1
answer
1k
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 ...
- 123
2
votes
2
answers
151
views
Where on Earth does paleo-groundwater exist?
Where on Earth do we expect to find very old groundwater (infiltrated thousands of years ago)?
- 123
1
vote
0
answers
68
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 ...
- 146
4
votes
0
answers
3k
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), ...
- 41