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2018-07-10 P&E Agenda Attachment 1 to Item 8 - Draft Noosa River Plan
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Log in to see the plans as drawn3.2.2 Urban runoff Urban runoff is a mixture of treated and untreated stormwater. It can be a major source of pollution. It is delivered to waterways via the stormwater network and contains sediments, nutrients and chemical contaminants, and ‘gross pollution’ such as litter. The impervious surfaces of urban areas such as roofs, roads, driveways, car parks and paving also increase the velocity and quantity of runoff to waterways. Urban stormwater infrastructure, particularly water sensitive urban design (WSUD) infrastructure, can play a key role in reducing stormwater velocity and pollutants entering waterways. In new residential developments, the installation of bioretention basins has become the most common stormwater quality treatment. Bioretention basins are a hybrid engineered and vegetated filtration device used to remove sediment, nutrients and litter from urban stormwater runoff. In existing urban areas, stormwater quality treatment devices such as Gross Pollutant Traps (GPTs) were installed long before the bioretention basin technology. GPTs can intercept pollutants such as soil, silt, leaves, hydrocarbons and litter before entering the receiving waters. Continued upgrading and renewal of these types of infrastructure, as well as maintenance, is essential for ongoing effectiveness. Page 36 l Noosa River Plan
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