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Raingarden Rain Garden Bioretention Area 

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. Rain gardens consist of excavated basins equipped with a perforated pie underdrain. The underdrain is covered by a special soil- compost media in which specific vegetation is planted.
A rain garden is a bowl-shaped depression designed as a garden to capture, hold, and absorb rainwater. Rain gardens slow the flow of rainwater from roofs, sidewalks, streets, parking lots, and other impervious surfaces, allowing the water to penetrate the soil.

The soil cleans the water of pollutants before it enters the storm drain and empties into our bayous and bays. 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.
Rain gardens use native plants as well as nonnative plants that are adapted to our climate. 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.

Another benefit is that rain gardens serve as habitats for wildlife such as birds and butterflies. They are useful for residential, commercial, and public areas.

Above all, a rain garden is a landscape amenity, blending beauty and function—an attractive WaterSmart solution to water pollution.

URL: https://agrilifeextension.tamu.edu/library/gardening/rain-gardens/
Download a printer-friendly version of this publication: https://cdn-ext.agnet.tamu.edu/wp-content/uploads/2018/10/ERPT-008-rain-gardens-a-beautiful-solution-to-water-pollution.pdf
Drawing of cross-section of drainage.
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. Rain gardens consist of excavated basins equipped with a perforated pie underdrain. The underdrain is covered by a special soil- compost media in which specific vegetation is planted.

Rain garden designed and created for the Texas AgriLife Research and Extension Center, Dallas.

Proposed to be constructed in the southern portion of the AgriLife Campus the rain garden will have curb openings with a concrete flume that will allow for runoff to drain to a collection point within the garden for automatic sampling and flow measurement. A surface overflow box will drain water to an underground pipe away from the median. Additionally, the drainage layer of the rain garden will house perforated pipes that will assist in soil infiltration.
A flow measurement device will measure the overflow and perforated pipe. Water quality samples will be collected with an automatic sampler. A pressure transducer will be installed within a well point to measure soil water storage. The outflow will drain into a depression/ ditch via a flume.
Plants will be selected based on optimal performance of the rain garden, including treatment of the storm water. Overall, the monitoring data will be used to quantify total water inflow (runoff), outflow (runoff and infiltration), soil water storage, and pollutant balances. The rain garden will also be maintained beyond the scope of this project as a demonstration for the public.

Last updated on 11-May -2022 by https://twitter.com/RainGarden6/