Editing Dew (section)

== Artificial harvesting ==
{{Main|Air well (condenser)}}
The [[v:Rainwater harvesting/Dew harvesting/Dew collection and storage|harvesting of dew]] potentially allows water availability in areas where supporting weather conditions, such as rain, are lacking. Several man-made devices such as antique big stone piles in [[Ukraine]], medieval [[dew pond]]s in [[Southern England]], and volcanic stone covers on the fields of [[Lanzarote]] have been thought to be dew-catching devices, but could be shown to work on other principles. At present, the [[International Organisation for Dew Utilization|International Organization for Dew Utilization]] (OPUR) is working on effective, foil-based condensers for regions where rain or fog cannot cover water needs throughout the year.

Large-scale dew harvesting systems have been made by the [[Indian Institute of Management Ahmedabad]] (IIMA) with the participation of OPUR in the coastal, semiarid region of [[Kutch]].<ref>{{Cite journal |last1=Sharan |first1=G. |last2=Clus |first2=O. |last3=Singh |first3=S. |last4=Muselli |first4=M. |last5=Beysens |first5=D. |date=2011-07-01 |title=A very large dew and rain ridge collector in the Kutch area (Gujarat, India) |bibcode=2011JHyd..405..171S |journal=Journal of Hydrology |volume=405 |issue=1–2 |pages=171–181 |doi=10.1016/j.jhydrol.2011.05.019 |issn=0022-1694}}</ref> These condensers can harvest more than 200 liters (on average) of dew water per night for about 90 nights in the October-to-May dew season. The IIMA research laboratory has shown that dew can serve as a supplementary source of water in coastal arid areas.

A large-scale dew harvesting scheme envisages circulating cold sea water in EPDM collectors near the seashore. These condense dew and fog to supply clean drinking water.<ref>{{cite journal |author-link=Anil K. Rajvanshi |first1=Anil K. |last1=Rajvanshi |title=Large Scale Dew Collection as a Source of Fresh Water Supply |journal=Desalination |volume=36 |issue=3 |pages=299–306 |date=March 1981 |doi=10.1016/S0011-9164(00)88647-6 |bibcode=1981Desal..36..299R |citeseerx=10.1.1.730.5055}}</ref> Other, more recent, studies display possible roof integration for dew harvesting devices.<ref>{{Cite journal |last1=Carvajal |first1=Danilo |last2=Minonzio |first2=Jean-Gabriel |last3=Casanga |first3=Elvira |last4=Muñoz |first4=Jorge |last5=Aracena |first5=Alvaro |last6=Montecinos |first6=Sonia |last7=Beysens |first7=Daniel |date=2018-05-15 |title=Roof-integrated dew water harvesting in Combarbalá, Chile |journal=Journal of Water Supply: Research and Technology-Aqua |volume=67 |issue=4 |pages=357–374 |doi=10.2166/aqua.2018.174|doi-access=free }}</ref>