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of vegetated buffers. By setting a target for the
mean annual soil loss discharging downslope of
the buffer, it is possible to evaluate whether an
existing buffer is sufficient to meet that target. If
not, scenarios can be run with the model to deter-
mine what stem diameters, plant densities and
percentage covers are required to meet the target.
The outcome can then be matched to plants that
meet those requirements and which will grow in
the study area. Such scenarios can be adopted to
determine how to improve existing buffers and to
design new buffers where none previously existed.
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Acknowledgements
The research described in this chapter was carried
out as part of a research project on the strategic
placement and design of buffering features for
mitigating the effects of sediment and phospho-
rus in the landscape. The authors are grateful to
Defra for funding under Research Project PE0205,
and to Dr P.N. Owens for his advice and assist-
ance with the field measurement programme.
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