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! Rowspan=2|Location
 
! Rowspan=2|Location
! Colspan=2|Runoff reduction
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! Colspan=2|Runoff reduction, by length of strip
 
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!2 - 5 m
 
!2 - 5 m
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Performance of filter strips has also been evaluated based on the Roadside Vegetated Treatment Sites Study <ref name='Barrett2003'/> and the BMP Retrofit Pilot Study <ref>California Department of Transportation (Caltrans). 2004. BMP Retrofit Pilot Program, Final Report, CTSW-RT-01-050. Sacramento, CA.</ref>. These studies concluded that concentration reductions consistently occur for TSS and total [[heavy metals]] and frequently for dissolved metals. [[Water quality#Nutrients|Nutrients]] concentrations remained generally unchanged.  
 
Performance of filter strips has also been evaluated based on the Roadside Vegetated Treatment Sites Study <ref name='Barrett2003'/> and the BMP Retrofit Pilot Study <ref>California Department of Transportation (Caltrans). 2004. BMP Retrofit Pilot Program, Final Report, CTSW-RT-01-050. Sacramento, CA.</ref>. These studies concluded that concentration reductions consistently occur for TSS and total [[heavy metals]] and frequently for dissolved metals. [[Water quality#Nutrients|Nutrients]] concentrations remained generally unchanged.  
'''NOTE''' When vegetation cover on the filter strip is below 80% water quality performance declines.
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'''NOTE:'''Water quality performance declines when vegetation cover on the filter strip falls below 80 %.
[[Category:Water quality]]
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[[Category:Performance]]

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