The tables below illustrate two examples using the Buffer Width Design Tool. Identify the desired level of pollutant removal, then using the appropriate line in the graph, estimate the corresponding buffer width that will achieve that level.Įxamples Using the Buffer Width Design Tool The result is the appropriate line number to use for determining a buffer design width at one�s site.ģ. Add the total adjustment number to the reference line number.Add up the pluses and minuses to get the total adjustment.
Using Table B, select a line number that is higher or lower than the reference line number depending on how one�s site conditions and pollutant type differ from those of the reference line. Use of this graph amounts to selecting one line that is most appropriate for conditions at a given site.ġ.ğrom Table A, identify a reference line number for conditions that mostly closely resembles one�s site.Ģ.
#Buffer image tool full
The lines divide up the full range of possible pollutant removal levels into convenient increments. The seven lines in the Buffer Width Graph represent seven different site conditions (shown in Table A) that describe the typical range of agricultural sites. This tool was developed specifically for agricultural runoff but can be applied in a more general way to other land uses as well.įor more information on how this tool was developed, refer to the Frequently Asked Questions section at the end of this guideline.īuffer Width Design Tool for Surface Runoff The tool can be used for sediment, sediment-bound pollutants, and dissolved pollutants.
Adjustments are made for land slope, soil texture, field size, and soil surface condition. The tool is designed to quickly generate estimates of design width for a broad range of site conditions. The graph and tables on the following pages can be used to estimate a buffer width that will achieve a desired level of pollutant removal. 1.19 Buffer Width Design Tool for Surface RunoffĪt any given site, the level of pollutant removal from surface runoff depends primarily on buffer width.
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