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.
Rain Garden Co-op & Cost Share
HOK is seeking private homeowners to participate in its, Rain Garden Co-op and Cost Share Program. The program is targeted at residential homeowners living in Koʻolaupoko and aimed at addressing water quality issues. The project seeks homeowners who are interested in constructing rain gardens to reduce the amount of storm water runoff reaching streams and the ocean while enhancing their yards’ landscaping.
Funds are available to cover the material cost for such items as plants and soil with the rain gardens built by HOK staff, homeowners, volunteers and neighbors. The idea behind the co-op is to help your neighbor build a rain garden, in exchange; others will help build one on your property.
Certain restrictions apply and some areas are higher priority for cost share assistance.