2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | WATERSHED ANALYSIS IN MANITOWOC COUNTY, WI: HOW DOES “MORE COWS THAN PEOPLE” IMPACT PHOSPHATE LOADING AND WATER QUALITY IN LAKE MICHIGAN TRIBUTARIES? | Virtual Platform
WATERSHED ANALYSIS IN MANITOWOC COUNTY, WI: HOW DOES “MORE COWS THAN PEOPLE” IMPACT PHOSPHATE LOADING AND WATER QUALITY IN LAKE MICHIGAN TRIBUTARIES?
Tributaries of the Great Lakes cover extensive and varied landscapes including forests, agricultural lands, cities, and suburbs. This land use diversity creates the need for intensive investigations of water quality in localized tributaries in order to develop best management practices. Manitowoc County, WI, is an agriculturally dominated region where stream phosphorus loading impairs water quality, impacting ecological function, recreation, and property values. Weekly analysis of total and dissolved phosphate along the entire length of Centerville Creek showed that levels were consistently and notably above DNR thresholds. Samples collected within 24 hours of rainfall demonstrated runoff-based phosphate spikes at some, but not all, sample locations. High phosphate levels during periods of no rainfall suggest a consistent in-stream or subsurface phosphate contributions. Typically, phosphate loading in regional watersheds has been the result of surface runoff; however, our data suggest a more complex picture of phosphate sources and transport. Our data, visual stream assessment, and discussions with local agricultural professionals leads us to hypothesize that subsurface drainage, including tile drainage lines from agricultural fields, significantly contributes to nutrient loading. The data presented reinforce the need to carefully analyze localized tributary impacts.
- Management
- Nutrients
- Anthropogenic
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Presenters/Authors
Rebecca Abler
(), University of Wisconsin-Green Bay, Manitowoc Campus, ablerr@uwgb.edu;
ASHA DISCLOSURE:
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Richard Hein
(), University of Wisconsin-Green Bay, Manitowoc Campus, heinr@uwgb.edu;
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Nonfinancial -