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If the drought persists and you must find water, make a dew collector

 
Anonymous Coward
User ID: 1110734
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11/30/2012 05:01 PM
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If the drought persists and you must find water, make a dew collector
In a lot of 3rd world nations, or simply places where it's very arid, dew collectors are one way of acquiring some water. It doesn't produce much, maybe a liter or two depending upon the humidity and the temperature difference between night and day and the dew point.

A collector is usually made of plastic sheets and then these drip into a vessel. Then the water is filtered for drinking, or it can be applied to plants.



I know it's a small amount of water. If it's not raining and you can't drill a well because there's bedrock, and the local water source is polluted, and the SHTF and there's no city water, then this is one way that I know of to find some water.

There's one engineer in India, and he uses a sheet placed upon the roof to collect the water, then it drains into the raingutters, then it's filtered. That water is used for all the drinking water for the children in that school.


There's other means like tappin trees for water, but that depends upon the tree and the temperature change affecting sap flow. Many like maple and birch are good tasting, but if you do it too often, you can harm the tree. Spiles are metal tubes that you can insert into the cambium and they have hooks to hang buckets on too. They sell them seasonally at farmers feed stores or places that sell hardware to farmers.

If you have a chiller, a refrigerated line, then you can cause condensation to collect. Quite a bit actually, but of course you can't collect water directly on the metal chiller pipes as it will impart the metal ions to the water and isn't healthy. That all implies you have electricity to run the chiller. You'd need to filter the water still.

All the other ways produce very tiny amounts of water. There's always someone who posts a video on the transpiration of water from plants, but this is in such scant amounts that it's not useful really. Not unless you'd have scads of bags collecting from lots of trees. The solar still also produces very miniscule amounts of water, although it's theoretically possible you'd need so much vegetable matter to create the condensation that it would require too much work. You'd expend more water than take in through work.

If you have a valid scientific method for condensing water, then post it here.

There is one device I know that uses a windmill that chills the blades and the blades are vertical to the ground. Then it drips water into a collector. I've never seen anyone do it cheaply, so it's way beyond what most people could MacGuyver.

Hopefully the drought will break.
Anonymous Coward
User ID: 13761155
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11/30/2012 05:13 PM
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Re: If the drought persists and you must find water, make a dew collector
I already paids my dews. Why would I want to conjur up a dews collector fer? Unless you could get me some mountain dew.
Anonymous Coward (OP)
User ID: 1110734
United States
11/30/2012 05:19 PM
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Re: If the drought persists and you must find water, make a dew collector
Here's another video to get people thinking in case they have to make one. The dew collectors are sometimes called fog fences.


You have to collect it first thing in the morning, otherwise the water will evaporate. Some people use receptables in the ground to maximize the temperature difference and allow for better condensation volumes to form.

One theoretical idea is to bring in cold sea water in a pipe, send it through a heat exchanger, then use that as a chiller to collect condensation, then divert the sea water in special ponds for aquaculture. If I lived near the sea, I'd think about this idea.
Anonymous Coward (OP)
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11/30/2012 05:24 PM
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Re: If the drought persists and you must find water, make a dew collector
Here's a large scale version of a fog fence built in Guatemala that provides water for a village.


Ideally if you needed water this badly, you'd dig a well. Sometimes a shallow point well can merely go ten feet or so, and you can tap into water. The main issue is that it's not deep enough and so you could have contaminants. You'd need a pump to channel the flow up and out, then filter it.

It's much better to dig a regular well. I'm just trying to give you some ideas in case the SHTF.
Anonymous Coward
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11/30/2012 05:29 PM
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Re: If the drought persists and you must find water, make a dew collector
another option in warm climes is the "solar still". one digs a hole about 2 ft deep. in the center, you place a collection vessel. you cover the hole with a sheet of plastic (food grade preferred) and place a small weight in the middle to give it a shallow cone shape. seal up the edges of the plastic with dirt from the hole. evaporation draws water from the soil, which then condenses of the bottom face of the sheet. the drops run down the cone, and drip into the collector. each one can produce anywhere from a pint to a half gallon a day depending on moisture content of the soil.
Anonymous Coward (OP)
User ID: 1110734
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11/30/2012 05:35 PM
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Re: If the drought persists and you must find water, make a dew collector
A lot of people have no idea how to collect water in Nature. They assume that they'll just collect it from rivers. I want you to sit down and pull up Google Earth and see how far it is to walk to a river and back. Then imagine the shortest route. Then figure how you'd create a cart to carry the jugs of water you needed. Say 2 gallons per person per day, so 8 gallons for a family of four.

The reason you need 2 gallons is you have to purify it and you'll lose some. You have a water filter, right? Water jugs? A cart? Pool shock to sanitize it?

I think you'll be surprised how far it is to walk and if things were very chaotic, imagine trying to collect water along with everyone else. Do you think people might steal your setup since they're desperate and don't have a way to haul water back? Probably.

That's ok. Some people will find the topic helpful since they're actively looking for ways to prepare.

Water is very heavy. 8 gallons of water weighs aproximately 67 lbs. It's not something you'd likely put on your back for very far, and then worry about breakage or spillage.
Bluebird

User ID: 27748381
United States
11/30/2012 05:46 PM

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Re: If the drought persists and you must find water, make a dew collector
These methods are all very interesting. You can also use condensation to convert sea water into fresh water, something that is also useful to know.

Maybe someone who knows how to do that will post on that as well.
One of the most important aspects of conspiracy theories is being able to discern when there isn't one.

Oh yeah, like you'd understand anyway.

Where are we going and why am I in this handbasket?. . .J. Handy
Anonymous Coward (OP)
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11/30/2012 06:02 PM
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Re: If the drought persists and you must find water, make a dew collector
These methods are all very interesting. You can also use condensation to convert sea water into fresh water, something that is also useful to know.

Maybe someone who knows how to do that will post on that as well.
 Quoting: Bluebird


I described the process above, but it's technical. You'd need an engineer to design the sea water pump to a heat exchanger to create the condensation.
[link to www.solaqua.com]

Wind power is used for the salt water pumping.

If one lived near sea water, then the easiest way is a solar still. You place a vessle of the sea water inside the stil and pure water condenses and then collects. It's slow and requires sunshine.
[link to www.solaqua.com]
Here's one they sell for about $500 USA. You could make one.
Anonymous Coward (OP)
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11/30/2012 06:03 PM
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Re: If the drought persists and you must find water, make a dew collector
Here's the technical paper on salt water chilling and producing pure water condensation:
[link to www.nariphaltan.org]
Anonymous Coward (OP)
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11/30/2012 06:03 PM
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Re: If the drought persists and you must find water, make a dew collector
Here's the technical paper on salt water chilling and producing pure water condensation:
[link to www.nariphaltan.org]
Anonymous Coward
User ID: 16702127
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11/30/2012 06:04 PM
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Re: If the drought persists and you must find water, make a dew collector
Anonymous Coward
User ID: 28147705
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11/30/2012 06:16 PM
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Re: If the drought persists and you must find water, make a dew collector
These methods are all very interesting. You can also use condensation to convert sea water into fresh water, something that is also useful to know.

Maybe someone who knows how to do that will post on that as well.
 Quoting: Bluebird


modify the solar still concept. food grade 55 gal. drum that has been headed, outside painted a dark color. 1/2 way up the inside, set up a method for centrally mounting a funnel (spokes from the inner surface of the drum to a ring, as an example). use as wide a funnel as possible without blocking airflow from the bottom to top of drum.1/3 way up from the bottom of the drum, drill a 5/8 inch hole, and put a rubber firewall grommet in it that allows a half inch tube to pass through. thread tubing (food grade flex plastic)through grommet to spout of funnel, other end of tubing to collection vessel. fill drum 1/4 full of sea water. cover drum head with food grade plastic, weighted in center to form shallow cone. tie around plastic on outside of drum with cordage of any variety to form a seal. water evaporates, condenses on the plastic, rolls down cone to drip into funnel, runs through tube to collection vessel. when the brine in the drum becomes thick sludge, add more sea water. final brine product (sludge) can be dried into sea salt in shallow pans in sun (tradable item, we all need salt in our diets). the output of such a rig should be on the order of a few gallons a day (more in warm climes, less in cooler). with several of these set up in a good seaside location, you can provide quite a bit of fresh water and salt.
Anonymous Coward (OP)
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12/04/2012 06:42 AM
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Re: If the drought persists and you must find water, make a dew collector
Kudos to the moderator who added a news story about gathering water from the air. Look to your left in the News column, or click here:
[link to science.the-environmentalist.org]

Now if only we understood how the 3rd method which is being used by the military, even in arid evironoments. It uses an unknown salt solution to draw water into a chamber, then extract it as pure water. It seems very novel.

[link to en.wikipedia.org]
It looks like it's lithium chloride or lithium bromide.

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