Cleaning Up Stormwater:
Understanding Pollutant Removal from Runoff

While the swirling, iridescent patterns of oil floating on water can be beautiful, their environmental impacts can be severe. An acre (0.4 ha) of parking lot typically collects as much as 4 gallons (15 l) of oil and other hydrocarbons annually—and much of that gets washed into the stormwater system, usually making its way into our streams, rivers, and lakes. In many developed areas, stormwater runoff is the single largest source of water pollution.

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