Education

Publications

Hydrologic Modeling of Distributed Stormwater Control Measure Retrofit and Examination of Impact of Subcatchment Discretization in PCSWMM

Shaneyfelt, K. M., Johnson, J. P., & Hunt, W. F. (2021), JOURNAL OF SUSTAINABLE WATER IN THE BUILT ENVIRONMENT, 7(3). https://doi.org/10.1061/JSWBAY.0000938

Field Assessment of the Hydrologic Mitigation Performance of Three Aging Bioretention Cells

Johnson, J. P., & Hunt, W. F. (2020), JOURNAL OF SUSTAINABLE WATER IN THE BUILT ENVIRONMENT, 6(4). https://doi.org/10.1061/jswbay.0000925

Flood Flow Frequency Analysis to Estimate Potential Floodplain Nitrogen Treatment during Overbank Flow Events in Urban Stream Restoration Projects

Doll, B. A., Kurki-Fox, J. J., Page, J. L., Nelson, N. G., & Johnson, J. P. (2020), Water, 12(6), 1568. https://doi.org/10.3390/w12061568

Hydrologic Performance of a Permeable Pavement and Stormwater Harvesting Treatment Train Stormwater Control Measure

Winston, R. J., Arend, K., Dorsey, J. D., Johnson, J. P., & Hunt, W. F. (2020), Journal of Sustainable Water in the Built Environment, 6(1), 04019011. https://doi.org/10.1061/jswbay.0000889

A Retrospective Comparison of Water Quality Treatment in a Bioretention Cell 16 Years Following Initial Analysis

Johnson, J., & Hunt, W. (2019), Sustainability, 11(7), 1945. https://doi.org/10.3390/su11071945

Insights from using in-situ ultraviolet–visible spectroscopy to assess nitrogen treatment and subsurface dynamics in a regenerative stormwater conveyance (RSC) system

Cizek, A. R., Johnson, J. P., Birgand, F., Hunt, W. F., & McLaughlin, R. A. (2019), Journal of Environmental Management, 252, 109656. https://doi.org/10.1016/j.jenvman.2019.109656

Evaluating the spatial distribution of pollutants and associated maintenance requirements in an 11 year-old bioretention cell in urban Charlotte, NC

Johnson, J. P., & Hunt, W. F. (2016), JOURNAL OF ENVIRONMENTAL MANAGEMENT, 184, 363–370. https://doi.org/10.1016/j.jenvman.2016.10.009

View all publications via NC State Libraries

Grants

Greenfield Lake 319 Wet Pond Retrofit

US Environmental Protection Agency (EPA)(6/01/20 - 9/30/22)

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Greenfield Lake 319 Wet Pond Retrofit

Sponsor: US Environmental Protection Agency (EPA)

Start Date: 6/01/20

End Date: 9/30/22

Abstract

As a subcontractor to Cape Fear River Watch, the NCSU Stormwater Engineering Group will design, install, and provide monitoring equipment and oversight for an innovative treatment berm retrofit. While wet ponds are effective at attenuating peak flows, previous research has shown inconsistent pollutant removal efficiency. As ponds are a popular SCM in North Carolina, the improvement of their pollutant removal efficiencies is essential in nutrient sensitive watersheds. To address these treatment shortcomings, research has recently focused on retrofits to existing wet ponds to improve nutrient removal. A reactive treatment berm will be installed on private property by a project partner as directed by NCSU. NCSU will partner with one of the nation’s largest stormwater maintenance companies (Apex Companies) to construct and maintain the retrofit.

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Evaluating the nutrient removal capabilities of the Suntree Technologies Nutrient Separating Baffle Box

Suntree Technologies, Inc.(6/01/18 - 12/31/19)

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Evaluating the nutrient removal capabilities of the Suntree Technologies Nutrient Separating Baffle Box

Sponsor: Suntree Technologies, Inc.

Start Date: 6/01/18

End Date: 12/31/19

Abstract

This project (“Evaluating the nutrient removal capabilities of the Suntree Technologies Nutrient Separating Baffle Box”) aims to explore the water quality performance of a proprietary stormwater control product in Hickory, NC. As the regulation of exported nutrient pollution continues to be an area of particular focus in nutrient sensitive watersheds in North Carolina, there is a growing need for stormwater control measures, products, and devices with the capability to curtail nutrient loads from stormwater runoff. This project will test the treatment capabilities of the Nutrient Separation Baffle Box (NSBB) by Suntree Technologies as it pre-treats stormwater runoff that enters a proprietary underground detention system. The NSBB will be installed at Hendrick Honda in Hickory, NC and will treat stormwater runoff from a completely impervious watershed. Monitoring will include the collection of paired samples from 18 storm events that will subsequently be analyzed for nitrogen, phosphorus, and total suspended solids.

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Brynn Marr Watershed Water Quality Improvement

US Environmental Protection Agency (EPA)(5/01/17 - 6/30/21)

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Brynn Marr Watershed Water Quality Improvement

Sponsor: US Environmental Protection Agency (EPA)

Start Date: 5/01/17

End Date: 6/30/21

Abstract

Jacksonville, North Carolina, has experienced explosive population growth and subsequent land development over the last 25 years. In 2014, Forbes magazine listed Jacksonville as the fifth fastest-growing small city in the country. Due in part to this rapid development, water quality in the New River, a part of the White Oak River Basin, has declined significantly. Local watersheds in and around Jacksonville have experienced an increase in flooding, stream bank erosion, and sedimentation. In addition, portions of the New River are classified as nutrient sensitive. Of particular concern are the closing of SA waters in the New River due to high bacteria counts. All rivers in the basin have periods of anoxia, as well as incidents of high fecal coliform counts and turbidity levels. Operating under the White Oak River Basin Restoration Priorities (ORBRP) document developed by the Ecosystem Enhancement Program in 2010, this project aims, through the design and installation of two urban stormwater control measures (SCM), to begin the process of mimicking predevelopment hydrology in areas characterized by high percentages of impervious surface. The two engineering projects slated for installation for this project are SCMs designed to retain and treatstormwater runoff from highly impervious commercial parcels. Both projects will be monitored for hydrology and water quality in order to assess design criteria for the region. This first project is a bioretention cell located in the parking lot of the Brynn Marr shopping center off Bell Fork Road in Jacksonville’s Brynn Marr Watershed. This project will treat a large percentage of stormwater runoff from an aging parking lot. The second project, also located in the Brynn Marr Watershed, is a constructed wetland located in the back parking lot of a local business, currently vacant. The parking lot is adjacent to a drainage ditch that will be expanded to hold and treat higher volumes of runoff. A pre-discharge sand filter will be added as an experimental design element. A sand berm will be constructed to force water through the filter before it reaches the outlet. Sand filtration is used widely in the early stages of drinking water treatment and the same concept may also be applied to stormwater treatment. Sand filters have an established record for pathogen removal which ideally will translate to constructed wetland systems. Both projects have support from the respective property owners, and both are in locations that will draw a great deal of attention to the effort. In keeping with the goals of the ORBRP, NC State Biological and Agricultural Engineering Department will partner with City of Jacksonville Stormwater and the local N.C. State Extension Office to collaborate not only on the design and construction of the projects, but public outreach and education as well. NC State will conduct at least one BMP Inspection and Maintenance workshop for Jacksonville residents and city staff to further promote stormwater awareness within the community. In addition, because the New River has not yet been assigned a formal watershed restoration plan as identified by the NCDENR 319 grant program, as project match NC State will aid the City of Jacksonville in the development of this document. By establishing a recognized 9-step restoration program, the City of Jacksonville ensure eligibility for future 319 funds geared toward water quality improvement in the New River.

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Investigating Blue, Green, And Conventional Roof Stormwater Management At The University Of North Carolina At Chapel Hill

NC Clean Water Management Trust Fund(5/01/15 - 7/31/19)

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Investigating Blue, Green, And Conventional Roof Stormwater Management At The University Of North Carolina At Chapel Hill

Sponsor: NC Clean Water Management Trust Fund

Start Date: 5/01/15

End Date: 7/31/19

Abstract

A pair of roof retrofits will be tested on top of the Daniels Student Stores Building at UNC-Chapel Hill. The roof’s six scuppers will be divided between a control set up, a green roof, and a blue roof (two of each). NCSU- Bio & Ag Engineering will cooperate with UNC-CH facilities to monitor each roof ‘parcel’ for 12 months, determining how each roof treatment (v. control) improves runoff quality and reduces outflows.

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UNC-CH Battle Grove RSC Monitoring

US Environmental Protection Agency (EPA)(1/01/15 - 9/30/18)

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UNC-CH Battle Grove RSC Monitoring

Sponsor: US Environmental Protection Agency (EPA)

Start Date: 1/01/15

End Date: 9/30/18

Abstract

To fully understand the impact of a proposed regenerative stormwater conveyance (RSC) to be installed on UNC-Chapel Hill’s campus, a paired watershed monitoring study will be implemented, which imparts the advantage that climate and hydrologic differences from year to year can be statistically controlled. Currently, approximately 39 acres of the University of Chapel-Hill’s campus drains to a single rock-lined open conveyance. This watershed includes two sub-watersheds: the 20-acre watershed directly intercepted and treated by the RSC best management practice to be installed, and a 19-acre watershed that will not be retrofitted during the entirety of the study. Through pre-RSC construction and post-construction monitoring periods totaling approximately two years, a statistical comparison can be made on the macro-effect of this SCM on the water quality concentrations seen draining from the experimental catchments.

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Stormwater Monitoring of Two Stormtech Chamber Systems in Polk County, NC

Advanced Drainage Systems, Inc.(3/01/15 - 3/31/20)

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Stormwater Monitoring of Two Stormtech Chamber Systems in Polk County, NC

Sponsor: Advanced Drainage Systems, Inc.

Start Date: 3/01/15

End Date: 3/31/20

Abstract

North Carolina State University will be contracted as a third-party independent researching entity to evaluate a proprietary underground detention system for hydraulics, hydrology, and water quality. The stormwater control measure (SCM) will be located at Tryon International Equestrian Center in Polk County, North Carolina. NC State researchers will evaluate overall sediment, nitrogen, and phosphorus removal capabilities of the system over the course of 18 storm events. A final report detailing performance metrics important to the State of North Carolina, as well as the engineering research field as a whole, will be produced.

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