Low Impact Development (LID) Bioretention Technology Ta

Since its initial development and application in 1993 (Clar, 1993), the Bioretention system also referred to as “raingardens” has rapidly become one of the most versatile and widely used BMPs throughout the US and many parts of the world. It has recently become identified as a preferred site practice for green building design and LEEDS certification. Despite the rapid acceptance of this BMP throughout the US, detailed design guidance is not currently available for many regions of the US. An initial Bioretention Design Manual (Clar, 1993) was developed for Prince George’s County, Maryland in 1993. The guidance contained in this manual was subsequently incorporated by the State of Maryland in the 2000 Stormwater Management Design Manual (MDE, 2000). Many state and local governments have adopted the Bioretention guideline published by MDE, often without modifying the guidelines for local conditions, or without a good understanding of the range or limitations of this BMP. The committee was formed to address this need with representatives from the various regions of the US to conduct a science based assessment of the existing technology associated with the design and construction of Bioretention systems.