China needs more water. So it’s building a rain-making network three times the size of Spain | South China Morning Post
Tens of thousands of chambers will be built at selected locations across the Tibetan plateau to produce rainfall over a total area of about 1.6 million square kilometres (620,000 square miles), or three times the size of Spain. It will be the world’s biggest such project.
The chambers burn solid fuel to produce silver iodide, a cloud-seeding agent with a crystalline structure much like ice.
The chambers stand on steep mountain ridges facing the moist monsoon from south Asia. As wind hits the mountain, it produces an upward draft and sweeps the particles into the clouds to induce rain and snow.