Green swales reduce pollution on the A11 Case Study Building with Nature Salix River & Wetland Services Limited Salix, Croxton Park, Thetford, Norfolk IP24 1LS Telephone 0370 350 1851 Fax 0370 350 1852 info@salixrw.com www.salixrw.com Salix worked with Balfour Beatty and the Highways Agency to create a highly effective large scale SuDS project for 18 km along the side of the A11. Products Used • Tensar HydraCX • Tensar Bionet C125BN • Grass Mix The new soft engineered ‘Greenswale Grass Channel’ attenuates road run-off water, filters suspended solids, and traps hydro carbons and heavy metals, significantly improving water quality. Due to the presence of special protection aquifers in this area of the A11, the Highways Agency’s environmental statement required a green drainag

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