__NOTOC__ <small{{Language-title box|english_link= Water Portal / Rainwater Harvesting / Fog and dew collection / Fog collection and storage | french_link= La collecte des eaux de pluie />Captage de brouillard et collecte de rosée / Captage de brouillard et conservation de l'eau | spanish_link= Coming soon | hindi_link= वाटर पोर्टल / वर्षाजल संचयन / कोहरा और ओस संग्रह / कोहरा जल संग्रह और भंडारण | malayalam_link= Coming soon | tamil_link= Coming soon | korean_link= Coming soon | chinese_link=雾水的收集与存储 | indonesian_link= Panen Air Hujan / Pengumpulan Embun dan Kabut / Pengumpulan dan penyimpanan kabut | japanese_link= 霧収集と保存 }} __NOTOC__
[[Image:Fog_water_collection_icon.png|right|80px]]
[[Image:Fog_collection.JPG|thumb|right|200px|Interception nets for fog harvesting, Nepal]]
'''Fog water collection ''' uses large polypropylene mesh nets on ridges to capture water-loaded fog, which forms in humid months in mountainous regions or coastal areas. The meshes are erected perpendicular to the prevailing wind. The mesh captures small water droplets (1 to 40 μm), which trickle into a collection trough or gutter and drain into a series of tanks. Trees and grass intercept fog in a similar way.
Intercepted fog is commonly of a good quality, but may be affected by air pollution, dirt on roofs or rust on metal sheets. If measures are taken to prevent the first polluted flush entering storage tanks, water can be fit for drinking and other domestic use with little or no treatment.
===Construction, operation & maintenance===
[[Image:Dropnet.JPG|thumb|right|200px|New design of fog nets called the [http://www.designboominhabitat.com/weblog/cat/8/view/9269/imkedropnet-fog-collector-harvests-the-mist-to-create-pure-hoehlerdrinking-dropnet.html water/ Dropnet] by German designer Imke Hoehler.]]
Once a polypropylene net is obtained, use it correctly in a double layer. This is normally either polypropylene or polyethylene, u/v protected, with 35% shade coefficient, Raschel mesh weave, and a 1mm fibre size. Efficiency increases with smaller mesh sizes and fibre width.
In Nepal, cost per m2 was $60, which included all materials for nets and reservoirs, plus labour.
* [http://balwoisarxiv.comorg/balwoisabs/administration/full_paper/ffp-5870707.pdf 2931 FOG AND DEW COLLECTION PROJECTS IN CROATIA.]
===Manuals, videos, and links===
{{#ev:youtube|_Xn7YTzPydE|200|right|Fog Water project in Eritrea.}}
* [http://www.fogquest.org FogQuest]
* [http://www.newah.org.np/servicespublication/fog-water-leaflet/fogwater.php NEWAH information on fog water collection]. Nepal Water for Health (NEWAH)[http://www.newah.org.np homepage].* [httphttps://www.idrc.ca/en/evarticle/collecting-26965fog-201el-1-DO_TOPIC.html Tapping into Fogtofo Collecting fog on El Tofo], IDRC]. International Development Research Centre (IDRC) In French: [httphttps://www.idrc.ca homepage/fr/article/des-filets-nuages-sur-la-crete-del-tofo Des filets à nuages sur la crête d’El Tofo]
* [http://dspace.lib.cranfield.ac.uk/handle/1826/4727 Fogwater Harvesting for Community Water Supply] MSc Thesis, Cranfield University
* [http://www.ecpublications.gc.ca/Publicationssite/eng/380219/defaultpublication.asp?lang=En&xml=8366E97B-2DD6-4EBD-B5C0-216089C3E394 html The Environment Canada Handbook on Fog and Fog Forecasting] Environment Canada.<br><br><br>
===Acknowledgments===
* CARE Nederland, Desk Study: [[Resilient WASH systems in drought-prone areas]]. October 2010.
* [http://www.washdoc.info/docsearch/title/169828 Smart Water Harvesting Solutions: Examples of innovative, low cost technologies for rain, fog, and runoff water and groundwater.] (or [http://www.arcworld.org/downloads/smart%20water%20harvesting.pdf alternative link]) Netherlands Water Partnership, Aqua for All, Agromisa, et al. 2007.
* Schemenauer, Robert and Cereceda, Pilar. [http://wwwtiempo.tiempocyberclimatesei-international.org/portal/archive/issue26/t26art3.htm Tiempo: Fog Collection]* [http://www.tech-action.org/Publications/TNA-Guidebooks/TNA_Guidebook_AdaptationAgriculture.pdf Technologies for Climate Change Adaptation: Agricultural Sector.] UNEP. August 2011.