It is questionable if the potential water collection techniques at the micro scale could be scaled up and work on a larger scale, but it could be applied in theory. Currently, fog nets are being employed in the Andes for the use of water collection from the fog.
The current project set up nets about 30 meters square along hillsides around Lima. The fog condenses on the nets and the water that drips off is collected in troughs and routed to brick tanks. The fog collectors can yield 600 liters per day, which is a substantial amount. www.bayer.com/en/64-69-Nebelfaenger-en.pdfx
This is an area with a large amount of dense fog, but I believe that this shows potential for a surface texture or material to be applied to building surfaces. The surface or material could potentially control the flow of water and concentrate it to specific areas to enhance the water collection capabilities.
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