Browsing by Subject "Winona"

Now showing 1 - 12 of 12
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    2015 Winona County Adolescent Sexual Health Report
    (2015) Teenwise Minnesota
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    2016 Winona County Adolescent Sexual Health Report
    (2016) Healthy Youth Development - Prevention Research Center
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    2017 Winona County Adolescent Sexual Health Report
    (2017) Healthy Youth Development - Prevention Research Center
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    2018 Winona County Adolescent Sexual Health Report
    (2018) Healthy Youth Development - Prevention Research Center
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    2019 Winona County Adolescent Sexual Health Report
    (2019) Healthy Youth Development - Prevention Research Center
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    2020 Winona County Adolescent Sexual Health Report
    (2020) Healthy Youth Development - Prevention Research Center
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    2022 Winona County Adolescent Sexual Health Report
    (2022) Healthy Youth Development - Prevention Research Center
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    2023 Winona County Adolescent Sexual Health Report
    (2023) Healthy Youth Development - Prevention Research Center
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    Altura Minnesota lagoon collapses
    (Proceedings of the First Multidisciplinary Conference on Sinkholes. Orlando, Florida 15-17 October 1984. "Sinkholes: Their Geology, Engineering and Environmental Impact. Edited by Barry F. Beck of the Florida Sinkhole Research Institute, University of Central Florida, Orlando. Page 311 - 318. Taylor & Francis, London, UK. Offprint, 1984-10-17) Book, Paul R; Alexander Jr., E. Calvin
    In April 1976, a series of karst sinkholes opened in the holding lagoon of the Altura, Minnesota Waste Treatment Facility. This major failure was preceded by minor sinkhole formation during the construction of the facility in 1974. Subsequent detailed field mapping of the region around the community revealed at least 23 sinkholes not shown on existing maps. The distribution of the sinkholes as well as post-failure investigations of the lagoon indicate that catastrophic collapse is related to the presence of a thin, poorly indurated, jointed sandstone overlying a thick carbonate unit. The sandstone served to collect solutionally aggressive vadose water and to concentrate that water onto specific areas of the underlying carbonate. The resulting differential solution produced voids into which the overlying materials collapsed.
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    Altura, MN Waste Treatment Lagoon Failures: A Hydrogeologic Study
    (1984-02) Book, Paul R; Alexander Jr., E. Calvin
    In April 1976, a series of karat sinkholes opened in the holding lagoon of the Altura MN Waste Treatment Facility. Subsequent detailed field mapping of the region around the community revealed at least 22 sinkholes not shown on existing maps. The distribution of the sinkholes as well as post-failure investigations of the lagoon indicate that catastrophic collapse is related to the presence of a thin, poorly indurated, jointed sandstone overlying a thick carbonate unit. The sandstone served to collect solutionally aggressive vadose water and to concentrate that water onto specific areas of the underlying carbonate. The resulting differential solution produced voids into which the overlying materials collapsed. The disabled facility has been diverting partially treated effluent into a nearby dry run since the lagoon collapsed. A dye trace documented that the effluent after sinking underground reemerges from three local springs and then flows into a river which is a regional trout fishery. However, a second dye trace from the sinkhole in the lagoon failed to establish a connection to any local well or spring.
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    Summary of Results: Survey of Winona County Farm Operators.
    (1987) Anding, Thomas L.; Gilkeson, John R.; Kajer, Kevin L.