
The desert is hot and dehydration can set in quickly. If you are
stuck or stranded in the desert, you can use the sun to generate a
sufficient amount of water for yourself. You will probably,
however, lose more water perspiring while building the still than
it will generate for you in the end. This article discusses the
concept of a "Solar 'still", or distillery. It can be used to
collect water from soil in any climate, given enough sunlight and
existent soil moisture.
Steps
- Dig a few curved holes (the more the better) about two feet
deep so that the moist subsoil is clearly visible. If you are in
dryer conditions, dig the hole a bit deeper, as it is
essential that the moist subsoil is clearly
visible.
- Place an open coffee can, mug, cup or canteen in the center of
each hole. If you have a length of plastic tubing, you can run it
from the bottom of the coffee can out the edge of the hole.
- Lay a taut piece of clear plastic wrap across the top of the
hole. To create a seal, pour sand in a circle around the hole along
the outside of the plastic wrap. Pour the sand an inch or two from
the edge of the plastic wrap. Ensure that the tubing runs
underneath the plastic, and that there are no gaps not sealed by
the sand.
- Place a small to medium sized rock in the center of the plastic
wrap so that the plastic wrap dips to a point above the can.
- Sit back and wait for the sun to evaporate water out of the
moist soil. The water will condense on the plastic wrap because it
cannot escape the hole and will drip into the can. Given the right
soil moisture, this technique can generate an abundance of water!
You can use the tubing to suck the water from the can without
dismantling the 'still until the hole is depleted.
- Once the sun dries the subsoil in that hole, start the process
all over by digging another hole.
Alternate Method
- Collect it from fog. It may seem odd, but fog is usually
present where other forms of water are not. This technique only
works in high elevations, though.
- Make a sort of net from nylon or polypropylene.
- Prop up the net in a double layer supported by two poles.
- Prop up the net so the wind blows into it.
- Place a sort of tank underneath the net.
- Leave your net up overnight.
- In the morning, check the net. There should be water in the
tank. What happened is that as the fog rolled in, the condensed
water droplets hit the net. The droplets could not pass through the
net and thus they rolled into the tank.
Tips
- In the hole you can add a small amount of vegetation so that
more evaporation will occur.
- Do not dig the hole in the shade. The process needs direct
sunlight to work correctly.
- This technique can also be used to purify dirty water. Simply
replace the hole with a larger container and do everything else the
same. Fill the bowl with the muddy and nasty water and seal it over
with plastic wrap and weight the sheeting over your cup. Place in
the sun and wait. Once the water evaporates, it will be free of
contaminants and clean, and safe to drink (so long as there are no
microbes that might still be hanging around).
- Urinating in the hole provides extra moisture and is sanitary
because only the water evaporates. Urine has Urea Nitrogen in it,
which converts to ammonia, which will evaporate more readily than
water!!
- If