Fog Harvesting in Morocco
Morocco is now using fog harvesting nets to capture drops of mist (fog) and convert it into drinking water.
Fog collection refers to the collection of water from fog using large pieces of vertical canvas to make the fog condense into droplets of water and flow down towards a trough below the canvas, known as a fog fence.
Through a process known as condensation, atmospheric water vapour from the air naturally condenses on cold surfaces into droplets of liquid water known as dew. The phenomenon is most observable on thin, flat, exposed objects including plant leaves and blades of grass. As the exposed surface cools by radiating its heat to the sky, atmospheric moisture condenses at a rate greater than that of which it can evaporate, resulting in the formation of water droplets.
Nets set to trap fog and collect drinking water. Since 2014, this ingenious method is used in the south of Morocco to address the shortage of the precious liquid.
At 1225 m altitude, strange nets surround the top of the mountain Boutmezguida, in the southwest of Morocco. Directed towards the fog, they catch the water droplets in the manner of a spider web. The liquid then flows into a trough, before being led into a basin where it is filtered and mixed with spring water to add minerals, then to pipelines flowing towards five villages situated below the mountain.
Initiated in 2006, the project is inspired by the fog nets installed in Chile and Peru by the NGO Fog Quest. “I immediately thought that the concept could be imported here, says Aissa Dehrem, originally the project and president of the Association Dar Si hmad. Especially when I saw the guards antenna towers capturing mist of water condensed on the antennas. ”
Around the top, nets cover an area of 600 m2 and help ensure the daily needs of about 500 people. A revolution in this region where water is scarce. “Before, women and children had to walk more than three hours a day to fetch water, says Aissa Derhem. And when the well was dry, they had no choice but to buy water at a high price “for locals, direct access to water is an economic development pledge. It helps fight against the rural exodus by opening new opportunities such as the use of organic farming of vegetables for guest houses.
In 2016, the association, in collaboration with the German NGO Wasserstiftung tested new nets more resistant to high winds. Made with polypropylene, they should soon cover an area of 1600 m2 and provide 35.2 tons of water per day on average. Enough to meet the growing demand from other villages in the region.