Enhanced Filters

Enhanced (peat-sand) filters use layers of peat, lime, and/or topsoil, and may also use a grass cover (Figure 9.23.3) to remove particulate pollutants. To minimize clogging, both sand and enhanced filters should be preceded by a solid-removing unit, such as a pond or a filter strip.

Grass Layer

Grass Layer

storm water management practice for urban areas [Department of Environmental Programs, Metropolitan Washington Council of Governments, Washington, D.C.].)
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