In a semi-arid region of Morocco, where tap water is a luxury but fog is plentiful, a fog-harvesting net based on the structure of a spider’s web naturally collects moisture from the air. Engineer Peter Trautwein of the German Water Foundation volunteered his time to develop CloudFisher, a structure that looks like no more than a fence from afar. Get closer, and you’ll see a metal framework supporting the stretched nets, with gutters and tubing directing the collected droplets to tanks.
The nets are placed along the area around Mount Boutmezguida, which is known for being one of the driest parts of Morocco, but also the foggiest. When the wind blows, it pushes moisture into the complex woven netting, effectively trapping it. Rubber expanders holding the nets to the frames reduce the impact of wind pressure on the net to keep them from breaking.
CloudFisher is the result of many years of …