Challenge:
Supplement scarce water by condensing water from air that has high relative humidity.
Proposed solution:
Pump cold seawater through condensation coils which allow condensation from humid air, and collection of water. The air around Cape Town is a good candidate having high relative humidity 70% - 80%(https://weather-and-climate.com/average-monthly-Humidity-perc,Cape_Town,South-Africa). The seawater is cold (https://seatemperature.info/cape-point-water-temperature.html) and gets colder at deeper levels - about 10 deg. C per 500 meters (http://www.destinydeepseawater.com/ocean_temp_info.html). Thus water at 5 degrees or less could be pumped up. The condensation units could be floating at sea, or stationary at the coast.
The pump could be wind-driven. “the average speed at Cape Point was 6,9 metres per second and 42%of its wind blew at eight or more metres per second.” https://mg.co.za/article/2003-07-03-which-is-sas-windiest-city
Desired hackathon goal:
In terms of ensuring that innovations do not create more problems than they solve (progress traps), the exercise would be to evaluate firstly what the potential adverse effects of the device/project would be, and if the cons do not outweigh the pros, then proceed with development.
Resources:
Needed: ethical and technical evaluation of the pros and cons.
If it’s a go, technical expertise for researching the effective size of the materials, and required scale of project deployment.