The Leviathan project is a structure whose function is to produce drinking water that is available autonomously and for free. In the water cycle, it is in the state of rain that water contains the fewest impurities. As such, it is of particular interest to intercept it at this exact moment.
Firstly, the water is collected in a dome before falling from the top of the mast. When it lands at the bottom, the water is cleaned of its impurities. It then contained in an underground water reservoir until the point that its purity can be shared.