World Environmental and Water Resources Congress 2020
Hydraulic Performance of Vegetated Filter Strips (VFS) during High-Intensity Runoff Events
Publication: World Environmental and Water Resources Congress 2020: Water, Wastewater, and Stormwater and Water Desalination and Reuse
ABSTRACT
Vegetated roadway shoulders equipped with engineered media (vegetated filter strips, VFS) may be an effective measure to treat contaminated stormwater runoff from roadways. However, when the infiltration capacity of the VFS is exceeded, untreated stormwater may bypass the VFS as surface runoff. Precipitation and runoff from 1-hour, high-intensity storms (1–3 in/hr) were simulated over two 1:1 scale physical models (treatment and control) of road shoulders and embankments. The treatment test bed contained a layer of engineered media, biosorption activated media (BAM) while the control test bed contained A-3 sandy soils. Hortonian surface flow generated near the shoulder edges during most tests; however surface flow consistently generated further along the treatment shoulder as compared to the control. Furthermore, by 20 ft from the shoulder edge, all surface flows had infiltrated into the control test bed, while respectively 22% and 35% of inflows bypassed the VFS as surface runoff in the treatment bed during the highest intensity simulations (2 and 3 in/hr). This may suggest that water infiltrates more readily into unaltered media.
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ACKNOWLEDGEMENTS
This research is funded by the Florida Department of Transportation. Authors would like to thank all student research assistants who helped to undertake testing.
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Information & Authors
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Published In
World Environmental and Water Resources Congress 2020: Water, Wastewater, and Stormwater and Water Desalination and Reuse
Pages: 104 - 114
Editors: Sajjad Ahmad, Ph.D., and Regan Murray, Ph.D.
ISBN (Online): 978-0-7844-8298-8
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: May 14, 2020
Published in print: May 14, 2020
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