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Geosynthetic Filters for Water Quality Improvement of Urban Stormwater Runoff

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A properly designed geosynthetic filter can effectively capture suspended solids in highway stormwater runoff through a filtration mechanism while maintaining adequate hydraulic conductivity. Because these solids can often carry hazardous pollutants, their removal lessens the negative impacts of stormwater runoff on aquatic ecosystems. In this study, two geosynthetic filters were tested in the laboratory with an influent suspension having a hydraulic loading rate, total suspended solids (TSS) concentration, and particle size distribution similar to those reported for urban highway stormwater runoff. The results indicate that after a short priming period, a geotextile with an apparent opening size of 150 μm can effectively remove suspended solids to a target concentration of 30 mg/L, a common point discharge water quality target value. The results also showed that the change in hydraulic conductivity of the geosynthetic filter system can be related to suspended solids captured via a power function, which may be useful to predict the flow rate through the filter during its lifespan.

Keywords: Stormwater; filter; geotextile; highway runoff; hydraulic conductivity; total suspended solids

Document Type: Research Article


Publication date: 2010-01-01

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