Evaluating the Hydrologic Benefits of a Bioswale in Brunswick County, North Carolina (NC), USA
Bioswales are a promising stormwater control measure (SCM) for roadway runoff management, but few studies have assessed performance on a field scale. A bioswale is a vegetated channel with underlying engineered media and a perforated underdrain to promote improved hydrologic and water quality treatm...
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doaj-c73d1593c786491d8a3cef863ee2737f2020-11-24T21:56:52ZengMDPI AGWater2073-44412019-06-01116129110.3390/w11061291w11061291Evaluating the Hydrologic Benefits of a Bioswale in Brunswick County, North Carolina (NC), USARebecca A. Purvis0Ryan J. Winston1William F. Hunt2Brian Lipscomb3Karthik Narayanaswamy4Andrew McDaniel5Matthew S. Lauffer6Susan Libes7Atkins Engineering SNC-Lavalin, Raleigh, NC 27609, USADepartment of Food, Agricultural, and Biological Engineering, Ohio State University, Columbus, OH 43210, USADepartment of Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC 27695, USANorth Carolina Department of Transportation, Raleigh, NC 27610, USAAECOM, Morrisville, NC 27560, USANorth Carolina Department of Transportation, Raleigh, NC 27610, USANorth Carolina Department of Transportation, Raleigh, NC 27610, USADepartment of Coastal and Marine Systems Science, Coastal Carolina University, Conway, SC 29528, USABioswales are a promising stormwater control measure (SCM) for roadway runoff management, but few studies have assessed performance on a field scale. A bioswale is a vegetated channel with underlying engineered media and a perforated underdrain to promote improved hydrologic and water quality treatment. A bioswale with a rip-rap lined forebay was constructed along state highway NC 211 in Bolivia, North Carolina, USA, and monitored for 12 months. Thirty-seven of the 39 monitored rain events exfiltrated into underlying soils, resulting in no appreciable overflow or underdrain volume. The bioswale completely exfiltrated a storm event of 86.1 mm. The one event to have underdrain-only flow was 4.8 mm. The largest and third-largest rainfall depth events (82.6 and 146 mm, respectively) had a large percentage (85%) of volume exfiltrated, but also had appreciable overflow and underdrain volumes exiting the bioswale, resulting in no peak flow mitigation. Overall, this bioswale design was able to capture and manage storms larger than the design storm (38 mm), showing the positive hydrologic performance that can be achieved by this bioswale. The high treatment capabilities were likely due to the high infiltration rate of the media and the underlying soil, longer forebay underlain with media, gravel detention layer with an underdrain, and shallow slope.https://www.mdpi.com/2073-4441/11/6/1291bioretentionbioswalehydrologyrunoffstormwater |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Rebecca A. Purvis Ryan J. Winston William F. Hunt Brian Lipscomb Karthik Narayanaswamy Andrew McDaniel Matthew S. Lauffer Susan Libes |
spellingShingle |
Rebecca A. Purvis Ryan J. Winston William F. Hunt Brian Lipscomb Karthik Narayanaswamy Andrew McDaniel Matthew S. Lauffer Susan Libes Evaluating the Hydrologic Benefits of a Bioswale in Brunswick County, North Carolina (NC), USA Water bioretention bioswale hydrology runoff stormwater |
author_facet |
Rebecca A. Purvis Ryan J. Winston William F. Hunt Brian Lipscomb Karthik Narayanaswamy Andrew McDaniel Matthew S. Lauffer Susan Libes |
author_sort |
Rebecca A. Purvis |
title |
Evaluating the Hydrologic Benefits of a Bioswale in Brunswick County, North Carolina (NC), USA |
title_short |
Evaluating the Hydrologic Benefits of a Bioswale in Brunswick County, North Carolina (NC), USA |
title_full |
Evaluating the Hydrologic Benefits of a Bioswale in Brunswick County, North Carolina (NC), USA |
title_fullStr |
Evaluating the Hydrologic Benefits of a Bioswale in Brunswick County, North Carolina (NC), USA |
title_full_unstemmed |
Evaluating the Hydrologic Benefits of a Bioswale in Brunswick County, North Carolina (NC), USA |
title_sort |
evaluating the hydrologic benefits of a bioswale in brunswick county, north carolina (nc), usa |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2019-06-01 |
description |
Bioswales are a promising stormwater control measure (SCM) for roadway runoff management, but few studies have assessed performance on a field scale. A bioswale is a vegetated channel with underlying engineered media and a perforated underdrain to promote improved hydrologic and water quality treatment. A bioswale with a rip-rap lined forebay was constructed along state highway NC 211 in Bolivia, North Carolina, USA, and monitored for 12 months. Thirty-seven of the 39 monitored rain events exfiltrated into underlying soils, resulting in no appreciable overflow or underdrain volume. The bioswale completely exfiltrated a storm event of 86.1 mm. The one event to have underdrain-only flow was 4.8 mm. The largest and third-largest rainfall depth events (82.6 and 146 mm, respectively) had a large percentage (85%) of volume exfiltrated, but also had appreciable overflow and underdrain volumes exiting the bioswale, resulting in no peak flow mitigation. Overall, this bioswale design was able to capture and manage storms larger than the design storm (38 mm), showing the positive hydrologic performance that can be achieved by this bioswale. The high treatment capabilities were likely due to the high infiltration rate of the media and the underlying soil, longer forebay underlain with media, gravel detention layer with an underdrain, and shallow slope. |
topic |
bioretention bioswale hydrology runoff stormwater |
url |
https://www.mdpi.com/2073-4441/11/6/1291 |
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