Rainwater harvesting : Raised surface collection.
👉🏼 PDF: https://app.box.com/s/5ts60m380ek2c8l1cokfmksbk5qy31st ___ A Rainwater Raised Surface Collection system uses a raised surface to channel runoff water to a storage tank that is either under or above ground. It can provide convenient access to water in an emergency when alternative sources are scarce, emergency water supply systems are not yet in place, populations are scattered and/or to mitigate seasonal water shortages.