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Research ArticleResearch Section

Water quality effects of simulated conservation practice scenarios in the Little River Experimental watershed

J. Cho, G. Vellidis, D.D. Bosch, R. Lowrance and T. Strickland
Journal of Soil and Water Conservation November 2010, 65 (6) 463-473; DOI: https://doi.org/10.2489/jswc.65.6.463
J. Cho
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G. Vellidis
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D.D. Bosch
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R. Lowrance
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T. Strickland
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Abstract

The goal of this study was to evaluate the water quality effects of alternative conservation practice scenarios using the SWAT (Soil and Water Assessment Tool) model in the Little River Experimental watershed, a representative coastal plain watershed located in southern Georgia. We simulated the water quality effect of two suites of upland conservation practices (CPs)—one targeting erosion and the other targeting nutrients. We also simulated the impact of riparian forest buffers. Finally, we evaluated three different management scenarios for implementing the upland CPs: using a random approach, using subwatershed stream order as a prioritization criterion, and using subwatershed nonpoint source pollutant load as a prioritization criterion. The study showed that using subwatershed nonpoint source pollutant load as a prioritization criterion resulted in the most rapid water quality improvements. This improvement in water quality was nonlinear, while the other implementation schemes yield linear returns. Full implementation of the suite of CPs targeting erosion resulted in the greatest reductions of sediment (54.7%) and total phosphorus (55.9%) loads from upland crop areas. Full implementation of the suite of CPs targeting nutrient reduction resulted in the greatest total nitrogen load reduction (10.3%). Overall, an intact riparian forest buffer offered the most comprehensive reduction of nonpoint source pollutant loads—20.5% for sediment, 19.5% for total phosphorus, and 7.0% for total nitrogen. Simulation results indicate that at the current time, the single greatest contributor to nonpoint source pollutant reduction in the Little River Experimental watershed may be the current level of riparian forest cover.

Footnotes

  • Jaepil Cho is a research associate for the USDA Agricultural Research Service (ARS) Northwest Watershed Research Center, Boise, Idaho. George Vellidis is a professor in the Department of Biological and Agricultural Engineering, University of Georgia, Tifton, Georgia. David D. Bosch is a research hydraulic engineer, Richard Lowrance is a research ecologist, and Timothy Strickland is a supervisory soil scientist for the USDA ARS Southeast Watershed Research Laboratory, Tifton, Georgia.

  • © 2010 by the Soil and Water Conservation Society
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Journal of Soil and Water Conservation: 65 (6)
Journal of Soil and Water Conservation
Vol. 65, Issue 6
November/December 2010
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Water quality effects of simulated conservation practice scenarios in the Little River Experimental watershed
J. Cho, G. Vellidis, D.D. Bosch, R. Lowrance, T. Strickland
Journal of Soil and Water Conservation Nov 2010, 65 (6) 463-473; DOI: 10.2489/jswc.65.6.463

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Water quality effects of simulated conservation practice scenarios in the Little River Experimental watershed
J. Cho, G. Vellidis, D.D. Bosch, R. Lowrance, T. Strickland
Journal of Soil and Water Conservation Nov 2010, 65 (6) 463-473; DOI: 10.2489/jswc.65.6.463
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