Pretreatment reduces maintenance and prolongs the lifespan of structural stormwater BMPs by removing trash, debris, organic materials, coarse sediments, and associated pollutants prior to entering structural stormwater BMPs. Implementing pretreatment devices also improves aesthetics by capturing debris in focused or hidden areas. Pretreatment devices are installed immediately preceding one or more structural stormwater BMPs and are designed with consideration of the flow network and the downstream structural stormwater BMP characteristics. Pretreatment practices do not include practices designed to permanently treat a specific Water Quality Volume, nor do they include source control and pollution prevention practices, such as street sweeping.
Pretreatment practices include screening and straining devices, filtering devices, hydrodynamic separators, above and below ground devices, and other practices that do not readily fit into one of these types of practices. This page (Category) contains links to subcategories and pages that provide information on pretreatment devices that do not fir into one of these types of devices.
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