Browsing by Subject "Lake water quality"

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    Data and R-code for "Aquatic Macrophyte and Water Quality Response to Aluminum Sulfate Treatments"
    (2025-03-05) Hembre, Kaitlyn; Newman, Raymond M; Bajcz, Alex W; Berg, Matt; James, William; newma004@umn.edu; Newman, Raymond; Minnesota Aquatic Invasive Species Research Center (MAISRC); water
    This study examines data from 6 lakes in Minnesota and 2 in Wisconsin to assess the response of aquatic plants and water quality to aluminum sulfate (alum) treatments. The dataset spans from 2011 to 2023 and includes measurements of total epilimnetic phosphorus, Secchi depths, and the frequency of native and invasive macrophyte species. Data were collected directly by project personnel but we also include data provided by project collaborators that were used in the formal analysis. Additional data collected by project personnel, including all point intercept aquatic plant data, temperature, light and dissolved oxygen profiles, and additional water chemistry data are included to facilitate further analysis in the future. Results indicate a marked reduction in total epilimnetic phosphorus levels and improved water clarity (Secchi) after alum treatment, with notable increases in native macrophyte occurrence. Invasive species such as curly-leaf pondweed decreased after alum treat, while Eurasian watermilfoil exhibited variable responses. This comprehensive dataset highlights the effectiveness of alum treatments in enhancing water quality and supporting macrophyte health, with considerations for ongoing invasive species management.
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    Development of Alternative Onsite Treatment Systems [On-site treatment systems for domestic wastewater: A field comparison of alternative technologies] (1995-1997)
    (University of Minnesota Duluth, 1999) Axler, Richard P
    Approximately 500,000 Minnesota residences depend on individual or small community on-site wastewater treatment systems and 55-70% of them are either not in compliance with State Rules or are failing hydraulically to the surface. This is a direct human health threat from diseases, causes groundwater, stream and lake water quality degradation, and is a major impediment to the environmental and economic sustainability of the State’s water resources. The MTI projects over the period 1995-1999 keyed the development of an extremely successful state-wide partnership between the University (NRRI, UMD and UM-St. Paul), government resource & regulatory agencies (county, region, state and federal), and the private sector (engineering and consulting firms, contractors, vendors) to establish year-round, long-term performance, design criteria, cost-effectiveness and sustainability of alternative technologies for removing pathogens & nutrients from domestic wastewater. The program incorporates existing and newly created technology transfer and outreach/extension programs to efficiently transfer our findings to the private sector, to private citizens, to public planners and to policy makers to expedite potential changes in state or local rules. New business opportunities for new or existing companies have already occurred as a result of this project (>50 industry partners) and the total Match from 1995- 1999 was estimated to be $1,335,280 compared to MTI funding of $189,581 over the same period. Besides the business opportunities related to this project, effective alternative wastewater treatment systems will contribute to resolving some of our rural wastewater problems (e.g. affordable sewage systems for resorts and other commercial establishments throughout rural Minnesota) including the environmentally and politically sensitive northshore of Lake Superior, in addition to numerous other smaller, but sensitive lakes, and in geologically sensitive areas.
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    Minnesota lake water quality on-line database and visualization tools for exploratory trend analyses
    (University of Minnesota Duluth, 2009-08-31) Axler, Richard P; Will, Norman; Ruzycki, Elaine; Henneck, Jerald; Olker, Jennifer; Swintek, Joe