14 votes
Accepted

How are giant sinkholes filled up?

How Japan Filled That Ginormous Sinkhole In Just One Week: The Fukuoka sinkhole measuring 8,700 square feet (808 square meter), 65 foot (20 m) deep: they poured a mixture of soil, water, and cement ...
  • 2,636
9 votes
Accepted

At what depth does the underground begin to warm up?

Your question has an incorrect assumption built in. Near surface ground water temperatures are not generally colder, but rather reflect the average annual temperature. This will be colder than ...
4 votes
Accepted

How are aquifers found and traced?

Aquifers are relatively permeable zones of material that transmit water. Common aquifer materials include layers of unconsolidated sedimentary rock, like sands and gravels; and poorly cemented “...
  • 176
3 votes
Accepted

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

If it’s hot enough to alter the groundwater chemistry that is killing the trees, then you would see it in satellite thermal imaging. Remember, tree roots only go down about 20 to 30 feet at the most, ...
  • 176
3 votes

Transferring water using underground channel

This is already used in some cases. The one I'm familiar with is California's Coachella Valley, best known as the home to Palm Springs. Farms, golf courses, other businesses, and homes pump far more ...
  • 3,152
3 votes

At what depth does the underground begin to warm up?

The temperature would stabilize to a steady temperature when you go down 15 ft or so. The point where it gets significantly warmer is probably much deeper than you want to go. A better system ...
  • 31
3 votes

What are the most similar Earth analogues to Mars' seasonally recurring slope linea?

Analogues to Mars Recurring Slope Linea (RSL) is a current study topic in Antarctica (Dry Valleys). On Earth, analogues are known as water tracks, which are linear zones of higher moisture along ...
  • 2,623
2 votes

How is ground water mapped?

Groundwater data are collected from wells, as described in arkia's answer. I'll amplify on that answer. The driller or geologist describes the type of sediment encountered when drilling a well. ...
  • 4,349
2 votes

How is ground water mapped?

USGS conducts regular survey in over 20000 wells across the United States. The frequency of data collection depends on the site with around 7000 providing daily data. For some of those wells (...
  • 14.9k
2 votes
Accepted

What is the cause of temporary smell and black color of underground water?

This is due to the presence of iron sulfide in the water. The iron sulfide oxidizes and goes into solution. Ferrous iron oxidizes to ferric iron. Depending on the water chemistry, this commonly ...
  • 4,349
2 votes

Ways of detecting underground bodies of water

You may want to explore this question from Space Exploration SE. Strictly speaking, the question refers to ice detection, but the methods described there can also be used to identify liquid water. ...
  • 2,726
1 vote

Ways of detecting underground bodies of water

I want to add to the initial answer from Oscar: But first, as a matter for geophysical terminology clarification, let's separate two very important concepts: detection (i.e. "I see the top or the ...
  • 686
1 vote
Accepted

How much water do aquifers contain? How much does it take to deplete them?

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 ...
  • 183
1 vote

How are aquifers found and traced?

Aquifers are detected by boreholes or by water divining. Water divining is a very unscientific method which so far has no rational explanation, yet is often successful. I put this down to the fact ...
1 vote

How acidic waters make rocks disappear?

First of all, the rocks do not disappear they dissolve, so they are still there only dissolved into the liquid. You are using an acid (vinegar), this has a low pH. The rocks you are using (limestone)...
  • 1,830
1 vote

Transferring water using underground channel

Be aware that ducts lack the filtration process that bedrock often affords, and that you may introduce raw materials that are toxic to some of the ecosystem for the lake/etc. As long as that's not ...
1 vote

Transferring water using underground channel

1) I don't believe there is a fully global map as some parts/countries of the world are inaccessible for varying reasons; however, there are a number of maps available for areas around the world. 2) ...

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