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Sizing effectiveness of constructed wetlands for retaining tile-drain runoff and reducing nutrient inputs in watersheds.

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Abstract:

The Mackinaw River in central Illinois contains some of the highest quality tributaries remaining in the state; however, stream biodiversity is threatened by agricultural practices that dominate landuse within the watershed. Rapid transport of subterranean tile-drained waters from agricultural fields contributes to streambank erosion, high nutrient loading, and loss of wetland habitat throughout the watershed. We have estimated that 37-351 metric tons of NO3-N have been transported annually into the Mackinaw River mainstem from just 2 of 32 subwatersheds in the basin during the past 6 years. Our current research investigates a wetland to farmland ratio that may effectively reduce agricultural nutrient inputs to the river. We have worked with landowners to develop a 250-acre demonstration farm with 3 tile-drained wetland units, each consisting of a series of three wetland subunits that drain 3-9% of the surrounding farmland. Control gates and monitoring equipment set at inlets and outlets of the 9 wetland subunits are used to quantify nutrient concentrations and loadings as water drains from the agricultural drainage area through the wetland units. Preliminary results show 29-90% retention of NO3-N and 37-100% retention of dissolved phosphorus by wetlands representing 3-9% of the drainage area during spring 2007.
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Association:
Name: SOIL AND WATER CONSERVATION SOCIETY
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http://www.swcs.org


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URL: http://citation.allacademic.com/meta/p235384_index.html
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MLA Citation:

Bohnhoff, Kent., Kovacic, David., Wallace, Mike. and Lemke, A.. "Sizing effectiveness of constructed wetlands for retaining tile-drain runoff and reducing nutrient inputs in watersheds." Paper presented at the annual meeting of the SOIL AND WATER CONSERVATION SOCIETY, TBA, Tucson, Arizona, Jul 26, 2008 <Not Available>. 2013-12-14 <http://citation.allacademic.com/meta/p235384_index.html>

APA Citation:

Bohnhoff, K. L., Kovacic, D. A., Wallace, M. P. and Lemke, A. M. , 2008-07-26 "Sizing effectiveness of constructed wetlands for retaining tile-drain runoff and reducing nutrient inputs in watersheds." Paper presented at the annual meeting of the SOIL AND WATER CONSERVATION SOCIETY, TBA, Tucson, Arizona <Not Available>. 2013-12-14 from http://citation.allacademic.com/meta/p235384_index.html

Publication Type: Oral Presentation
Abstract: The Mackinaw River in central Illinois contains some of the highest quality tributaries remaining in the state; however, stream biodiversity is threatened by agricultural practices that dominate landuse within the watershed. Rapid transport of subterranean tile-drained waters from agricultural fields contributes to streambank erosion, high nutrient loading, and loss of wetland habitat throughout the watershed. We have estimated that 37-351 metric tons of NO3-N have been transported annually into the Mackinaw River mainstem from just 2 of 32 subwatersheds in the basin during the past 6 years. Our current research investigates a wetland to farmland ratio that may effectively reduce agricultural nutrient inputs to the river. We have worked with landowners to develop a 250-acre demonstration farm with 3 tile-drained wetland units, each consisting of a series of three wetland subunits that drain 3-9% of the surrounding farmland. Control gates and monitoring equipment set at inlets and outlets of the 9 wetland subunits are used to quantify nutrient concentrations and loadings as water drains from the agricultural drainage area through the wetland units. Preliminary results show 29-90% retention of NO3-N and 37-100% retention of dissolved phosphorus by wetlands representing 3-9% of the drainage area during spring 2007.

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Similar Titles:
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