Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Modeling Bioretention Basins to Meet Water Quality Drawdown Requirements
Water quality drawdown regulations require release of the water quality volume over an extended period of time to minimize stream erosion. The requirement for a bioretention basin is commonly 40 hours. Drawdown methods often analyze how fast the water quality volume would drain from the surface of the bioretention cell. The high permeability of bioretention soils make it difficult to prove that the basin is able to hold the water quality volume for extended periods of time without minimizing the surface area and lowering the permeability. The methodology presented shifts the focus to the volume released to the stream. Volume lost to evapotranspiration and infiltration can be as much as 50% of the water quality volume. If 50% of the volume does not discharge directly to the stream, the two design points on the drawdown curve are achieved independent of how fast the volume drains from the surface of the basin. Also provided is a method for meeting the drawdown requirements if the volume discharged to the stream is over 50%.
Modeling Bioretention Basins to Meet Water Quality Drawdown Requirements
Water quality drawdown regulations require release of the water quality volume over an extended period of time to minimize stream erosion. The requirement for a bioretention basin is commonly 40 hours. Drawdown methods often analyze how fast the water quality volume would drain from the surface of the bioretention cell. The high permeability of bioretention soils make it difficult to prove that the basin is able to hold the water quality volume for extended periods of time without minimizing the surface area and lowering the permeability. The methodology presented shifts the focus to the volume released to the stream. Volume lost to evapotranspiration and infiltration can be as much as 50% of the water quality volume. If 50% of the volume does not discharge directly to the stream, the two design points on the drawdown curve are achieved independent of how fast the volume drains from the surface of the basin. Also provided is a method for meeting the drawdown requirements if the volume discharged to the stream is over 50%.
Modeling Bioretention Basins to Meet Water Quality Drawdown Requirements
Turney, Douglas (Autor:in)
Second National Low Impact Development Conference ; 2007 ; Wilmington, North Carolina, United States
Low Impact Development ; 128-139
07.11.2008
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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