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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
  • 23.7k
10 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
10 votes

How do we compensate the water that is being taken out of water cycle for curing of concrete in infra construction?

The top twelve cement producing countries in 2020 produced 3191 Mt of cement. Increase this to 4000 Mt to include the rest of the world. Depending on the application, the water to cement ratio of ...
Fred's user avatar
  • 24.7k
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
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
  • 5,946
4 votes

How far can water wick up above the capillary fringe in sediment or soil?

The vadose zone can be on the order of meters, depending on the soil type (higher with finer soils). The maximum height of capillary rise ($h_c$) occurs where capillary suction head is equal to the ...
damp_civil's user avatar
3 votes
Accepted

What effect does river channelization have on the surrounding water table?

The concept of rivers being the outcrop of an aquifer at the surface is a useful generalization, but tends to simplify the real world. The water level in a river can be higher than the water table in ...
Andy M's user avatar
  • 2,091
2 votes

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

I will try to explain it with an analogy. In one pot pee. In the next pot is water you can drink. Now take a table spoon and move the pee from the pee pot to the drink pot, taking time to ...
coteyr's user avatar
  • 181
2 votes

How do we compensate the water that is being taken out of water cycle for curing of concrete in infra construction?

Concrete loses some minute water over time. It's undergoing curing....however for most part, Concrete does not harden by evaporation, it hardens by a chemical process called hydration. The water added ...
LazyReader's user avatar
2 votes

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

Think about elevation. The bottom of the lowest/deepest part of the Ogalala Aquifer is still hundreds of meters above sea level.
Beanluc's user avatar
  • 121
1 vote

How do we compensate the water that is being taken out of water cycle for curing of concrete in infra construction?

Not to worry, the gas burned in the kiln to produce the cement produces an offsetting amount of water.
blacksmith37's user avatar
  • 1,043
1 vote

How do we compensate the water that is being taken out of water cycle for curing of concrete in infra construction?

Global sea level rise is an increasing problem that governments are struggling to find a solution to. Sea level rise is mostly caused by ice sheets, and other permanent snow/ice, melting and a little ...
Mehmet Karatay's user avatar
1 vote

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

As professor A.S.Phillipe says: The cycle of water, this marvelous pump which work with solar energy and affords the alimentation of continent with around 40 000 km3/year. When seawater ...
Rabah Akrour's user avatar
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 ...
MiguelH's user avatar
  • 183
1 vote

What effect does concretization (paving/flooring with concrete) has on ground water table

I found this on the USGS website. It states the effect of increased pavement coverage due to urbanization is to reduce the recharge rate of ground water, because the water is diverted elsewhere. Also,...
Fred's user avatar
  • 24.7k
1 vote

Searching for ground water

Without seeing the details of the topography, you are correct in your assumption that water will infiltrate down past the tree root-zone to the water table. The shallow groundwater will likely form a ...
haresfur's user avatar
  • 4,419
1 vote

Searching for ground water

I live in Colorado, USA. All gas stations must have shallow wells drilled around the gasoline tanks to monitor for gasoline tank rupture leaks. The tanks usually lie above the water table so any gas ...
J.O. Williams's user avatar
1 vote

What is difference between partially penetrating stream and fully penetrating stream?

Streams that are shallow relative to the thickness of the aquifer in which they lie. Such streams often are referred to in the literature as partially penetrating streams. Most streams are partially ...
Natura's user avatar
  • 121
1 vote

What is meant by inverted water table?

To amplify on Gary's answer for the situation under a stream: Surface water will be connected to an unconfined groundwater aquifer if the sediments are saturated between the aquifer and the stream. If ...
haresfur's user avatar
  • 4,419
1 vote

Why confined aquifers have low storage?

In an unconfined aquifer the 'storage' is that fraction of the saturated void space that can be drained. In a confined aquifer, what you are effectively measuring is the compressibility of the aquifer ...
Gordon Stanger's user avatar

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