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Research Report No 282
Reduction of Road Run-off Contaminants: Laboratory Experiments and Monitoring of Treatment Walls, was published by NZTA (previously Transfund New Zealand and Land Transport New Zealand) as Research Report no 282, in 2005.
LandCare Research evaluated the effectiveness of various potential filtration media for the removal of contaminants from road run-off between July 1998 and June 2004. Laboratory studies were carried out over the first two years, with subsequent testing of the most promising medium in two pilot sites.