A vertical mesh net (UV-resistant agricultural shade cloth) strung taut between two posts intercepts suspended fog droplets, which run down the mesh into a gutter and gravity-feed a storage tank sited downhill, genuinely site- and climate-dependent. The reference installation (an Atacama desert fog-oasis research station) averages roughly 8L/m2/day, but yield depends entirely on local fog frequency and wind, which would need to be measured on-site over time before this is relied on as more than an opportunistic supplementary source. Normandy's oceanic climate does produce coastal/valley fog, but at nowhere near desert-fog-belt frequency, and no site-specific data exists yet, flagged honestly rather than assumed viable. Same non-potable-until-treated status as rain/surface water (cross-ref the water-potability spectrum discussion, Process Journal 2026-08-09).
Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.
Elevated, wind-exposed siting with regular fog incidence, verify local fog frequency before relying on this as a primary source
No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.