Large pieces of vertical canvas (fine-mesh nylon or polypropylene netting) are set-up to capture the condensed fog. These nets are placed perpendicular to the wind direction. The precipitated water flows from the sheets through troughs and pipes into a reservoir. Long dry periods will necessitate an alternative water source. Risk of contamination with suspended solids.
Actual costs vary highly per location and availability of proper nets. In Peru and Chile polypropylene mesh costs ~USD0.25/m2. Total for small fog collector: USD75-200. Large collectors (>40m2): ~USD1000-1500. Cost per m2 in Nepal (including reservoir and tap): USD60.
Depending on climatic conditions, water yield may be sufficient for a family or a small group of households. A caretaker should be assigned for the cleaning and maintenance. External support might be needed for the investment costs.
For highland areas with frequent frog. Susceptible to damage by storms. Potentially good water quality, but contamination may occur in drains or reservoir. Chlorination possible in reservoir. Thorough investigation of suitability (mainly on availability of cloud water) required before implementation.
Limited skills required for setup and maintenance. With high wind speeds, the nets need to be taken down. Tension of net and cables to be checked regularly. Maintenance includes regular cleaning and maintaining of drains, pipes, tanks and net.
Requires an awareness-raising campaign to acquaint potential users with this solution. Yields of 3-10 L/m2/day. Water production fluctuates per season, requiring alternative water source. Structures are often outside the community are and might be vandalized.
No relevant remarks for Fog collection.