A rain garden is a deliberately built depression planted with vegetation that allows storm water from impervious surfaces to collect, briefly settle, then infiltrate into the ground. Rain gardens have the ability to reduce the amount of pollution entering streams and the ocean by intercepting storm water. Rain gardens are ‘designed with nature’ as they mimic natural processes by treating and infiltrating storm water into the ground and evaporating it back into the air, much like undeveloped areas.
Hui o Ko'olaupoko has developed the Hawaiʻi State Rain Garden Manual. The manual is a do-it-yourself guide that steps builders through the processes of locating, sizing, constructing and planting a rain garden on their own properties. The manual is available for download here, public libraries on all islands or contact us to purchase a hard copy.