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Research ArticleResearch Section

Potential for saturated riparian buffers to treat tile drainage among 32 watersheds representing Iowa landscapes

M.D. Tomer, S.A. Porter, D.E. James and J.D. Van Horn
Journal of Soil and Water Conservation July 2020, 75 (4) 453-459; DOI: https://doi.org/10.2489/jswc.2020.00129
M.D. Tomer
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S.A. Porter
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D.E. James
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J.D. Van Horn
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Abstract

The saturated riparian buffer (SRB) is a new and cost-effective conservation practice that diverts agricultural tile drainage toward subsurface discharge within riparian buffers to achieve nitrate (NO3-N) removal. Conservation planners want to understand the potential role of the SRB practice for reducing NO3-N loads from tile-drained agricultural watersheds. The Agricultural Conservation Planning Framework (ACPF) includes a tool for identifying riparian zones where the SRB practice can be installed with minimal risks of unintended consequences (i.e., crop inundation and streambank failure). Watershed assessment of the potential role for SRBs, however, must identify where SRB-suited sites can actually receive drainage from tile-drained fields. This study compared the extent of SRB-suited riparian sites among 32 Iowa watersheds, and estimated the proportion of each watershed that was tile drained and located above SRB-suited riparian zones. Results showed the extent of sites suited for SRBs did not significantly differ among three Major Land Resource Areas (MLRAs) in Iowa, from which the selected watersheds were randomly chosen. Most watersheds had suitable sites along 30% to 70% of streambank lengths, where tile drainage from 15% to 40% of the watershed areas could be diverted, based on estimated extents of tile drainage above suitable sites. Therefore, the SRB has an important potential role for water quality improvement in many tile-drained watersheds in Iowa. However, the SRB practice is not readily designed for treating drainage from headwater catchments, which frequently comprised more than 30% of watershed areas in headwater streams of north central Iowa (MLRA 103), where tile drainage is extensive.

    Key words
  • Agricultural Conservation Planning Framework
  • saturated buffers
  • tile drainage
  • watershed analysis
  • © 2020 by the Soil and Water Conservation Society
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Journal of Soil and Water Conservation: 75 (4)
Journal of Soil and Water Conservation
Vol. 75, Issue 4
July/August 2020
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Potential for saturated riparian buffers to treat tile drainage among 32 watersheds representing Iowa landscapes
M.D. Tomer, S.A. Porter, D.E. James, J.D. Van Horn
Journal of Soil and Water Conservation Jul 2020, 75 (4) 453-459; DOI: 10.2489/jswc.2020.00129

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Potential for saturated riparian buffers to treat tile drainage among 32 watersheds representing Iowa landscapes
M.D. Tomer, S.A. Porter, D.E. James, J.D. Van Horn
Journal of Soil and Water Conservation Jul 2020, 75 (4) 453-459; DOI: 10.2489/jswc.2020.00129
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Keywords

  • Agricultural Conservation Planning Framework
  • saturated buffers
  • tile drainage
  • watershed analysis

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