Rainwater harvesting/Dew harvesting

Dew harvesting (or dew collection) is simply taking advantage of water vapor in the atmosphere to harvest clean and potable water through condensation, a passive process that allows water particles to return to the earth in a pure form. Dew harvesting has been practiced by humanity as far back as ancient times, in areas where rainfall and groundwater resources are scarce. When there is any humidity at all in the air and there is a surface that is cool enough to provoke condensation, dew will condense on that surface until the humidity is gone. Vegetation in desert regions have developed modifications that allow them to collect their own humidity from the air, for example, and through efforts of reforestation in desert regions this technology has advanced abundantly around the world.

Acknowledgements

 * Rainwater Harvesting Guide, Rain-barrel.net


 * Fog collection description, Safe Water International Clearinghouse.


 * Original Akvopedia.org article and more images: akvopedia.org/wiki/Fog_and_dew_collection