[[Image:Dew system.jpg|thumb|right{{Language-box|400px|Experimental dew condenser in Vignola (Corsica island, France).]]Dew can bring substantial amount of water when the other resources (groundwater, rain, fog) are lacking. english_link= Water Portal / Rainwater harvesting structures can also be used to collect Harvesting / Fog and dew at night, which condenses on a surface from where water droplets drip into a gutter that goes to a reservoir. Quantity from dew varies according to location but at times has been shown to constitute a significant proportion of normal rainfall. collection / Dew collection is a possible supplementary source of water in arid and semi- arid areas, but has so far not been widely applied and is an area of further research.storage | french_link= La collecte des eaux de pluie / Captage de brouillard et collecte de rosée / Captage de rosée et conservation de l'eau | spanish_link= Coming soon | hindi_link= वाटर पोर्टल / वर्षाजल संचयन / कोहरा और ओस संग्रह / ओस बूंदों का संग्रह और भंडारण | malayalam_link= Coming soon | tamil_link= Coming soon | korean_link= Coming soon | chinese_link=露水的收集与存储 | indonesian_link= Coming soon | japanese_link= Coming soon }}
==Suitable conditions==[[Image:Dew collection icon.png|right|80px|]]{{Climate_change__NOTOC__ [[Image:Dew system.jpg|text1=thumb|right|200px|Experimental dew condenser in Vignola (Corsica island, France). Photo: [http://www.opur.fr/ OPUR.]]]'''Dew collection is not affected by drought or changing precipitation''' can bring substantial amount of water when the other resources (groundwater, rain, only if there fog) are changes in humiditylacking. Rainwater harvesting structures can also be used to collect dew at night, which condenses on a surface from where water droplets drip into a gutter that goes to a reservoir. Less humidity means less Quantity from dewvaries according to location but at times has been shown to constitute a significant proportion of normal rainfall. Dew collection is a possible supplementary source of water in arid and semi- arid areas, but has so far not been widely applied and is an area of further research.}}
===Suitable conditions===
* Large areas of unused land.
* Areas with large diurnal temperature range (at least 12 degrees Celsius from day to night).
* Areas with low winds (winds cause evaporation). It is advised to have an upper limit of 4 m/s at 10m.
* The average wind speeds where dew forms correspond to rather large speed (1-2 m/s), higher than ones found in continental locations of 0.1 - 0.2 m/s.
* Dew yields are seen to rise when cloud cover diminishes because the radiative cooling increases.
* The largest dew yields correspond to the highest humidity and the lowest cooling temperature.
* Near roadsides
{{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#f0f8ff;" | Disadvantages|-| valign="top" | - Water quality can be good <br>
- Unaffected by drought <br>
- Can possibly be a supplementary water source to rainwater harvesting <br>
- Low costs especially for dew irrigation ($1 per plant) <br>
- Possible to do on household level <br>
| convalign= "top" | - Relatively small water quantities can be harvested <br>
- Variability in water collection, which also varies according to the season. Need to supplement water from other sources. <br>
|}} ===Resilience to changes in the environment===Dew collection is not affected by drought or changing precipitation, only if there are changes in humidity. Less humidity means less dew.
===Construction, operation and maintenance===[[Image:Dew storage system.jpg|thumb|right|300px200px|A dew-collecting house in Salbunara bay, NW of Biševo Island. The 15.1 m2 roof has its symmetry axis oriented east (left)-west (right). Sea is on the west side. Photo : D. Beysens.]]
The best time to gather dew is in the early morning before the sun has touched your collection area.
Dew collection can also be used to create a form of micro irrigation where plastic trays are used to funnel dew to plant roots.
===Costs===
Costs vary widely, but the materials needed in each locality will determine total costs to build a system. <br>
A simple system consists of a large flat angled surface, pipes or gutters to transport the dripping, and a collection tank.
===Field experiences===* [http://arxiv.org/pdf/0707.2931.pdf FOG AND DEW COLLECTION PROJECTS IN CROATIA.]
==Reference manuals=Manuals, videos & , and links===
[http://www.opur.fr/ International Organization for Dew Utilization (OPUR)]
===Acknowledgements==Articles produced from the following documents: <br>=* CARE Nederland, ''Desk Study : [[Resilient WASH systems in drought -prone areas'']]. October 2010.* M. Mileta, D., Beysens and V. Nikolayev, et al. [http://wwwarxiv.google.comorg/pdf/url?sa=t&rct=j&q=&esrc=s&source=web&cd=11&ved=0CDkQFjAAOAo&url=http%3A%2F%2Fbalwois0707.com%2Fbalwois%2Fadministration%2Ffull_paper%2Fffp-5872931.pdf&ei=yiNuT4XHJeiOiALGz_iNBQ&usg=AFQjCNFcGJ2LQ0cEcCxzw5ZCCjS4SVZu0w&sig2=Dp12ayEQaGJPZpLDfHMpzw ''Fog and Dew Collection Projects in Croatia''] Croatia and France, 2004.* [http://wwwweb.archive.org/web/20150407124605/http://tacticalintelligence.net:80/blog/dew-collection.htm ''Dew Collection for Survival Water''] Tactical Intelligence. July 2011.