Treatment Wetland Projects
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DuPont Constructed Wetland |
Great Swamp Effluent Management System - Beaufort-Jasper Water & Sewer Authority - Beaufort, SC
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The
Great Swamp Effluent Management System includes 400 acres of riverine
hardwood swamp forest for final polishing of over 3 mgd of highly
treated municipal effluent. This system works in concert with land
application areas to provide year-round effluent management options
in this water-quality limited coastal area. The natural wetland treatment
system is the only available and affordable option in this rapidly
developing area to deal with wet weather conditions. Dr. Knight has
provided consulting services to the Beaufort-Jasper Water and Sewer
Authority on this project since original conception. He directed or
participated in planning, design, construction, and WSI continues
to provide monitoring and permitting services. |
Click here for Papers and Reports
Beltway 8 (Sam Houston Tollway) Stormwater Treatment Wetland - Harris County Flood Control District - Houston, TX
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The Beltway 8 Stormwater Treatment Wetland encompasses 220 acres and is located northeast of the Houston, Texas metropolitan area. This project is part of the Greens Bayou Wetland Mitigation Bank and serves the dual purpose of water quality enhancement and wetland habitat creation. The project incorporates a treatment “train” of processes that cover the spectrum of treatment to habitat. An initial surge basin is used for flow equalization and sediment removal. Water is pumped from the surge basin to two polishing ponds for additional flow equalization and removal of remaining particulate pollutants. Water then flows by gravity through four polishing marshes and then into a large area of natural-appearing wetland habitats. High pollutant treatment efficiency has been recorded through operational monitoring, while wildlife use and habitat diversity are outstanding. Dr. Knight has provided consulting services to the Harris County Flood Control District on this project since original conception. He assisted with project planning, design, and construction, and WSI continues to provide operational monitoring services and data analysis. |
Click here for Papers and Reports
Periphyton-Based Stormwater Treatment Area Research and Demonstration Project - South Florida Water Management District - West Palm Beach, Florida
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WSI provided extensive consulting services related to the development of sound design guidelines for periphyton-based treatment wetlands. These services included the role of Dr. Knight as the project’s principal scientist and Mr. Clarke’s key role in data management and analysis. This project included design and operational research in a total of 31 experimental ecosystems, varying in size from 6 m2 to 2 ha (5 acres). Periphyton-based wetlands were operated for nearly four years to provide detailed design criteria for removal of total phosphorus from stormwaters in the Everglades Agricultural Area. This research was a critical link in the development of advanced treatment technologies for compliance with the Everglades Forever Act. WSI developed mesocosm designs, conducted field monitoring, organized and led a scientific review panel, analyzed data, authored reports, and conducted performance modeling for the project. |
Miami-Dade Wastewater Reuse Proejct - South Florida Water Management District - WPB, Florida
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Dr. Knight assisted the District as an expert for the evaluation of the transferability of monitoring information from the West Palm Beach Wetland Reuse project to the proposed Bird Drive Recharge Area wetland project. Treatment wetland issues that were reviewed included: conceptual design, water quality effects, impacts on groundwater and surface water, and effects on plant communities and wildlife populations. |
Ten Mile Creek Water Preserve Area Water Quality Assessment - St. Lucie County / South Florida Water Management District - WPB, Florida
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WSI assessed water quality benefits of the proposed Ten Mile Creek Reservoir and Polishing wetland. This critical project is intended to restore natural flows and freshwater releases to the St. Lucie River and estuary. Due to agricultural and urban development in the watershed, water quality is an important issue for increasing flows downstream. WSI applied state-of-the-art models for assessment of water quality changes in the reservoir and polishing cell, and provided design recommendations to the District. |
Everglades Protection Area Basin Specific Treatment Feasibility Studies - South Florida Water Management Disrict - WPB, Florida
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WSI
provided water quality modeling in 6 urban basins that discharge stormwater
to the Everglades Protection Area. Water quality modeling was based
on use of the Dynamic Model for Stormwater Treatment Areas (DMSTA).
Treatment technologies evaluated by WSI included Stormwater Treatment
Areas and Periphyton-Based STAs. |
Expert Assistance with the Efficacy of Submerged Aquatic Vegetation (SAV) Plant Communites for Treatment of Total Phosphorus - South Florida Water Management District - WPB, Florida
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WSI
provided expert assistance to the District to conduct an evaluation
of the long-term potential of SAV-dominated lakes to remove total
phosphorus from surface waters. WSI conducted a literature review
of existing information, selected representative lakes with SAV and
water quality data, and analyzed the data to calibrate the k-C* model
for summarizing their TP removal performance. |
Okeechobee Stormwater Treatment Area Design - U.S. Army Corps of Engineers / South Florida Water Management District - Jacksonville / WPB, Florida
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WSI provided consulting services on the conceptual and final design of two stormwater treatment areas north of Lake Okeechobee. The Grassy Island STA diverts flows from Taylor Creek for treatment of total phosphorus. The New Palm STA diverts water from nubbin Slough for treatment. WSI provided all water quality treatment assessments for these projects, conceptualized plant community design issues, and reviewed STA civil design. |
Click here for Papers and Reports
C-111 Water Protection Area Demonstration Project - U.S. Army Corps of Engineers - Jacksonville, Florida
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Dr. Knight was a member of the Scientific Advisory Committee for this project. He reviewed all plans related to implementation of large-scale demonstration treatment systems utilizing periphyton and SAV-dominated wetlands. |
Lake Okeechobee Watershed Project Implementation Report - U.S. Army Corps of Engineers / South Florida Water Management District - Jacksonville / WPB, Florida
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WSI
provided expert services related to STA design and operational analysis
for this CERP project. WSI reviewed design and performance models
for various STA alternatives including emergent macrophyte systems,
submerged aquatic plant systems, and periphyton-dominated systems.
WSI developed an STA ranking tool that rapidly assesses multiple STA
design alternatives in terms of cost effectiveness. WSI worked with
Dr. Bill Walker to re-calibrate the DMSTA model for use north of Lake
Okeechobee. |
Click here for Papers and Reports
Nubbin Slough and Taylor Creek STA Operations and Management Plans - South Florida Water Management District - WPB, Florida
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WSI prepared operation and management plans for these two critical project STAs. These plans provided complete rationale for monitoring efforts and described the methods and estimated costs to perform that monitoring. |
STA-3/4 Design Assistance - South Florida Water Management District - WPB, Florida
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WSI reviewed operational data and models for phosphorus removal in existing STAs and made recommendations for appropriate design parameters for the STA-3/4 design project. WSI also provided expert consulting services for the development of the full-scale PSTA demonstration project located in the STA-3/4 footprint and developed monitoring and operation plans for that facility. |
EAA Reservoirs Project Implementation Report (PIR) - U.S. Army Corps of Engineers / South Florida Water Management District - Jacksonville / WPB, Florida
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WSI provided expert consulting services related to development of the PIR for the EAA storage reservoir project. WSI reviewed and commented on the planning documents, the review of water quality assessment models for the reservoirs, and the estimation of future conditions with and without the project. |
Click here for Papers and Reports
Florida City Friedland Manor Stormwater Wetland Design - City of Florida City - Florida City, Florida
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WSI provided planning and conceptual design services for a stormwater treatment wetland located near Florida City in south Florida. This work included review of site data including runoff amounts, receiving water quality, and existing environmental site conditions and constraints. WSI developed a conceptual plan for the wetland system and presented it to the SFWMD and the City for review and comment. |
Water Quality Impacts of Reservoirs - Burns and McDonnell Engineers / South Florida Water Management District - Kansas City, Missouri / WPB, Florida
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WSI provided expert services related to assessing the water quality of storage reservoirs to be constructed as part of the Comprehensive Everglades Restoration Project (CERP). This project included identification of data sources from similar existing water bodies, data acquisition, data formatting and analysis, and delivery of data ready for model calibration. WSI identified a total of 18 data sources and obtained and processed all operational and environmental data for those sites. |
C-43 Basin (Caloosahatchee River) Reservoir Project Implementation Report - U.S. Army Corps of Engineers / South Florida Water Management District - Jacksonville / WPB, Florida
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WSI assisted with identification of existing wetland conditions for this project. This task included review of land use and National Wetland Inventory maps and summarization of key environmental features of these wetlands in a technical memorandum. |
DuPont Constructed Wetland - DuPont Nylon
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The DuPont
Wetland consists of approximately 53 acres of treatment and habitat
marshes. It includes a unique series of cells that provide various
levels of treatment as well as increasing habitat benefits. This is
the only industrial treatment wetland in the world that includes a
community education center and a full-time educator on-site. Dr. Knight
has been continuously involved in this project since its initial conception.
He provided advice on planning, permitting, design, operations, and
continuing monitoring. He continues to be a member of the Wetland
Advisory Team, a group of scientists and engineers who provide wetland
operational recommendations to DuPont management. The DuPont wetland
continues to provide important effluent polishing before ultimate
discharge to Guadalupe River and has been visited by over 11,000 students
as part of environmental studies courses. |
