Title: Grass Filtration - a New Option for the Treatment of Urban Stormwater
Abstract: Increased urbanisation has led to a significant deterioration in the quality of stormwater runoff with pollutant levels which are commonly in the order of 10 times higher than the recommended acceptable levels for the protection of freshwater ecosystems. A number of approaches are taken to improve the quality of urban stormwater. This paper reports on a novel application of grass vegetated filter strips which has been developed to direct urban stormwater from small catchment areas through parkland filter strips. The technique has been implemented and been monitored at two sites which have very different characteristics. One was designed as part of a new subdivision development in a hills environment with a filter of clumping grasses on a slope of approximately 20%. The second was retro-fitted into the stormwater system of a mature developed housing catchment on relatively flat terrain and with a filter of kikuya grass at a gradient of approximately 3%. Monitoring of the systems shows sediment removal efficiencies as high as 84% and turbidity removal of 44% to be achievable.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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