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Keywords: Natural & impervious cover diagrams EPA.jpg impervious surfaces and surface runoff U S Environmental Protection Agency Washington D C http //www epa gov/npdes/pubs/nps_urban-facts_final pdf Protecting Water Quality from Urban Runoff Document No EPA 841-F-03-003 U S Environmental Protection Agency Washington D C 2003-02 PD-USGov-EPA PD-USGov Environmental engineering Water pollution Societal models Stormwater management |