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Methods to prioritize placement of riparian buffers for improved water qualityAuthor(s): Mark D. Tomer; Michael G. Dosskey; Michael R. Burkart; David E. James; Matthew J. Helmers; Dean E. Eisenhauer
Source: Agroforest Syst: 10 p.
Publication Series: Miscellaneous Publication
PDF: View PDF (1.66 MB)
DescriptionAgroforestry buffers in riparian zones can improve stream water quality, provided they intercept and remove contaminants from surface runoff and/or shallow groundwater. Soils, topography, surficial geology, and hydrology determine the capability of forest buffers to intercept and treat these flows. This paper describes two landscape analysis techniques for identifying and mapping locations where agroforestry buffers can effectively improve water quality. One technique employs soil survey information to rank soil map units for ,how effectively a buffer, when sited on them, would trap sediment from adjacent cropped fields. Results allow soil map units to be compared for relative effectiveness of buffers for improving water quality and, thereby, to prioritize locations for buffer establishment. A second technique uses topographic and streamflow information to help identify locations where buffers are most likely to intercept water moving towards streams. For example, the topographic wetness index, an indicator of potential soil saturation on given terrain, identifies where buffers can readily intercept surface runoff and/or shallow groundwater flows. Maps based on this index can be useful for site-specific buffer placement at farm and small-watershed scales. A case study utilizing this technique shows that riparian forests likely have the greatest potential to improve water quality along firstorder streams, rather than larger streams. The two methods are complementary and could be combined, pending the outcome of future research. Both approaches also use data that are publicly available in the US. The information can guide projects and programs at scales ranging from farm-scale planning to regional policy implementation.
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CitationTomer, Mark D.; Dosskey, Michael G.; Burkart, Michael R.; James, David E.; Helmers, Matthew J.; Eisenhauer, Dean E. 2008. Methods to prioritize placement of riparian buffers for improved water quality. Agroforest Syst: 10 p.
KeywordsConservation planning, conservation practices, non-point pollution, soil survey, terrain analyses
- Placement of riparian forest buffers to improve water quality
- Improved indexes for targeting placement of buffers of Hortonian runoff
- An approach for using soil surveys to guide the placement of water quality buffers
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