Questions tagged [water]

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7
votes
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, ...
3
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1answer
180 views

Is it true that aquaponics yield crops with a lower nutritional value than soil-agriculture?

I read this article, in which a person claims that Aquaponics bring crop quality down by having more water than actual nutritional value. I have read many other sources that say the opposite. Can ...
18
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6answers
14k views

Why doesn't the 71% water of the earth dry or evaporate?

Perhaps a simple question, we know 71% of the earth's surface contains water as oceans. If Earth's age is 4.543 billion years, then I guess it should be decreased with drying or should have been dried ...
5
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1answer
270 views

Why does the loss of water from a felsic magma encourage crystallisation?

Felsic magmas crystallise in the crust, unlike mafic magmas which tend to make it to the Earth's surface, for the following reasons: They are more viscous than mafic magmas and therefore it is ...
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?
3
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1answer
139 views

Is there enough water to cover the surface of a topographically normalized earth?

Is there enough water in the oceans, ice caps, rivers and streams to cover a completely flattened earth, in proportional to land volume and water volume?
8
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2answers
954 views

Was the filling of the Three Gorges Dam's impact on the Earth's rotation rate detectable?

I'm a big fan of Vsauce and the video How Earth Moves is just one example of science related to the Earth available there (there's plenty more). But the statement in this video starting at ...
7
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1answer
3k views

Lake Manasarovar v.s. Lake Rakshastal: fresh-water v.s. salt-water

In Tibetan Plateau, about 4600m elevation, If Lake Manasarovar and Lake Rakshastal ("lake of the demon" ) used to be the same lake, but due to the tectonic activity now they are separated to two by ...
3
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1answer
475 views

From where do asteroids get water from? [closed]

We all know that the water on Earth came from asteroids that collided on the Earth. But how does water form in the asteroids?
9
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1answer
4k views

What is the temperature of the flowing water in icy river?

Boundaries of the question: The question is about rivers where water flows in cold area of the earth. Whether it's because of the winter or it's simply cold all year long. Usually, the top layer of ...
7
votes
1answer
118 views

How much water does a wave transport into a sea cave?

How much water is transported (volume) as a wave travels into a sea cave? The wave has a height of 1 m and a period of 12 seconds. The average water depth at the cave mouth it 5 m and the width is 15 ...
2
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0answers
46 views

Thermal spring. Gas and water characterization

I am interested in assessing a thermal spring in the Ecuadorian Andes. However I have no experience in these type of geological features and I am not sure how to proceed. The spring is located over ...
9
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1answer
657 views

How much water is the atmosphere losing to space?

Up until recently, I was under a (wrong) impression that the amount of planetary cumulative water resources was finite as I believed its escape from the atmosphere was impossible. I believed that, ...
5
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0answers
66 views

How does fog affect the conductivity/breakdown voltage of air?

Could the breakdown voltage of air significantly go down in very foggy weather (especially very salty fog from seawater)? Kind of a hypothetical question, but if anyone has something on this, I'd ...
5
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2answers
163 views

Calculate flow rate of wetland for gray water treatment

I'm currently attempting to design a water recycling solution for a carwash in a tropical country that currently uses up to 30m$^3$ (8,000 gallons US) of water in 12 hours. Based on my research in ...
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,...
2
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0answers
107 views

Connections between marine and terrestrial ecosystems [closed]

First I would like to note that I have only very basic understanding of ecology, biology and paleontology so I can easily miss something very simple. I can envision certain ways marine and ...
3
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1answer
1k views

What is the difference between Precipitable Water (PW or PWAT) and Quantitive Precipitation Forecast (QPF) in terms of computer weather model data?

When I take a look at weather models, there is an option to take a look at PWAT or QPF. What's the difference?
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'...
0
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1answer
140 views

How do I calculate Oxygen requirement in an aerobic waste water pond? [closed]

Assuming I have data of BOD, COD and water discharge. How do I calculate the O2 requirement?
3
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0answers
63 views

Are the Great Lakes Getting Cleaner, or worse?

I live in Hamilton Ontario which a major city right on the shore of Lake Ontario, and I was just doing some personal research on the pollution levels in lake Ontario. Generally the water here has a ...
2
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1answer
191 views

North Bay of Bengal warm pool anomaly

I am looking for an explanation for this warm pool of water in the North and North East Bay of Bengal - North Bay Warm Water Anomaly. Currently the path of the sun is towards the southern hemisphere ...
5
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2answers
3k views

What is (negative) wind stress curl?

I'm currently doing research for a paper in school where we need to research on a university-like level. When I read the paper Causes and impacts of the 2014 warm anomaly in the NE Pacific, I found ...
2
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1answer
75 views

Please could you help me finding global warming video with ice melting in glass time messurment scene?

Few months ago I watched a video posted on reddit about climate change and in it there was scene showing glass of water with ice cubes. They were measuring how long it takes for ice to melt and then ...
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 ...
2
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0answers
31 views

Is there a way to calculate difference initial water content, from curve number method?

I want to calculate difference between initial water content of a soil given that its saturation water content can be found from its type. Is there a way to find initial water content of that soil ...
5
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1answer
69 views

snow modelling using raster data with different resolution

I am trying model to some snow processes for the whole US. I do have daily climate forcing time series for a 1 x 1 km raster in a Lambert Conformal Conic Projection (netCdf format). The MODIS snow ...
1
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2answers
95 views

Amount of Earths water with consideration to space travel?

Everyone always says that there has always been, and always will be, the same amount of water on planet Earth. What about space travel? They obviously need water in space, so they must take it up ...
1
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0answers
46 views

Weathering of silicates

I am trying to find a relationship between the silicate-rich rocks weathering products. For example I've found information regarding gabbro weathering in which, according the consulted source, in 100 ...
1
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0answers
37 views

is the low-compressibility of seawater responsible for its bouyancy?

I'm trying to wrap my head around water's density, low-compressibillity and bouyancy. Are all these 3 things related, if so, how? I'm particularly interested if water's low compresibillity of ...
3
votes
2answers
163 views

Is ice also created ín cold water of the oceans?

Salt water of the oceans could freeze into ice at a temperature of -1,8C. Now there is a lot ice on the poles but of all the floating ice how much is that a grown in and of the water itself? With ...
4
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3answers
3k views

Where does all the salt come from in the Dead Sea?

Usually when I think of a lake it should be sweet water as all the water is coming from rivers/mountains and rain and, because it is very low situated, all ground water should also flow into it. But ...
3
votes
1answer
351 views

Is there more water in solid form than in liquid form on earth?

There is plenty water in the oceans, but I've read that deep in the crust/mantle of the earth within crystals and other rockforms is water enclosed. So could it be possible that there is more water ...
3
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1answer
210 views

What is the source of the Big Sur river?

While hiking in the Ventana Wilderness in Big Sur, Calfornia, I kept trying to figure out one question: what is the source of the Big Sur river? Wikipedia reports its tributaries being the Redwood ...
0
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1answer
112 views

Why don't toilets use saltwater? [closed]

My question is in the header. It would seem to be a major environmental benefit if toilets used saltwater in stead of drinkable fresh water, right?
3
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1answer
80 views

How would waves (in a fluid) behave without intermolecular attraction?

Water molecules, as many people know, are polarized, and so water molecules tend to have an attractive force between them. But how would the waves in water behave if this attraction no longer was ...
5
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2answers
2k views

What keeps water from sinking into earth?

I remember reading somewhere that there's evidence of water on Mars but it all sank into the Martian soil. So what prevents that happening on earth? Some people say it's because the crust is not ...
2
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0answers
29 views

Averaging watershed areas

If I am looking at different USGS stream gages, calculating their 90th percentile streamflow, and then doing a weighted average of the 90th percentile of the streamflows using the watershed areas - ...
11
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2answers
192 views

Waves on sandy beach separating differently-sized rocks?

I recently went to a beach, and I noticed that the sand seemed to have a few distinct regions. I'm wondering what would cause this, and how it works. One region is the part of the beach which is ...
5
votes
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 ...
1
vote
1answer
107 views

When GCMs are calibrated do they use 'corrected rainfall' input?

Part of calibrating Global Climatic Models involves 'hindcasts' or 'history matching' against historic climate records, including rainfall. Such rainfall records are all in error because almost all ...
1
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1answer
65 views

Elemental ratios in rocks and stream water

I have chemical analysis of one catchment which can be considered more or less homogeneous and also stream water analysis, I would like to know how elemental ratios (to Na for example) are related ...
3
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1answer
314 views

Cooling effect by evaporation [closed]

Why exactly does water cool down by evaporation? What happens in this process? How much does it cool down? What's the formula to describe this process?
9
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1answer
149 views

In -20 °C weather, creeks below waterfalls here form ice columns. What are these called? Ice-canoes?

I would like to know the name(s) of this ice formation. How common or rare is it? What other regions of the world does this occur in? What specific requirements are needed to produce it and could it ...
15
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4answers
10k views

What would be the effect of bringing seawater pipes to the Sahara desert?

This is a childhood dream. What would happen if pipes were installed (similar in principle to the Great Man-Made River, but for seawater) to continuously pump seawater into the Sahara desert. Let'...
5
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0answers
41 views

Is there a study relating water table to construction/RCC activity?

Background: The soil in our locality is/was Black Cotton Soil - mostly from weathered humus over the years. Our locality was also mostly large (by Indian standards) plots mostly with load-bearing ...
2
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2answers
135 views

Do ice crystals form in running super-cold water?

Crystals of sugar form in hot saturated sugar solution as it cools down, due to excess sugar molecules not fitting in the solution and precipitating as crystals. In a similar situation, if we have a ...
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 ...
4
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1answer
214 views

Source of sub-surface ringwoodite water

I was reading about the discovery of vast amounts of water locked up in ringwoodite (see here). The authors of the study seem to suggest that previous ideas, involving water deposits being delivered ...
3
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1answer
65 views

Should I cut buildings from flood zone? [closed]

At work (at a local authority), I have a flood zone plan/layer that was created using ArcGIS software from an Elevation Model which has an accuracy of 1 metre. The zone covers an urban area. I cannot ...