Prestwick Pilot Initiative - Rain Garden Planter Install

This video shows how easily a rain garden planter can be installed at a domestic property to help tackle flooding in the wider area.
More info at www.scottishwater.co.uk/rainproofprestwick

[@helenjohnston3178]

I've never herd of this before and the video does not have much explanation. How does this help? Are these to be bog or marginal plants? What happens in storms and more normal rainfall conditions? Where does excess water go?