The underdrain is covered by a special soil- compost media in which specific vegetation is planted. Rain gardens consist of excavated basins equipped with a perforated pie underdrain. Rain gardens or bioretention areas are designed to capture stormwater runoff, filter it through a special media and allow it to infiltrate, evapotranspire or flow out. They are useful for residential, commercial, and public areas.Ībove all, a rain garden is a landscape amenity, blending beauty and function-an attractive WaterSmart solution to water pollution.ĭownload a printer-friendly version of this publication: Drawing of cross-section of drainage. When designed properly, water in the rain garden should stand for no more than 24 to 48 hours, too short a period for mosquitoes to hatch.Īnother benefit is that rain gardens serve as habitats for wildlife such as birds and butterflies. Rain gardens use native plants as well as nonnative plants that are adapted to our climate. This process allows us to keep more of the rain that falls on our yards, and the storm water that finally enters the storm drain is cleaner.
The soil cleans the water of pollutants before it enters the storm drain and empties into our bayous and bays. Rain gardens slow the flow of rainwater from roofs, sidewalks, streets, parking lots, and other impervious surfaces, allowing the water to penetrate the soil. Follow us on Twitter updated on 10-July-2023.Ī rain garden is a bowl-shaped depression designed as a garden to capture, hold, and absorb rainwater.
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