A rain garden is a water-saving garden that is designed to capture stormwater from hard surfaces such as driveways, patios and roofs via downpipes after it rains. Read more: Melbourne Water Encourages Australian Citizens to Build Rain Gardens
The RainSaucer is a rain harvesting tool! The water has to be cleaner than water coming off of the roof and it's easier this way then hooking everything up to the gutter system and filtering the roof debris off.
Raised beds, collecting rainwater as well. - perhaps tiered beds can have a French drain at the end that catches excess water run off from the rain. It would be a larger area to collect rain water and would only be extra If the other plants were all