In large U.S. cities, 25 percent to more than 60 percent of the land area is covered by impervious roadways, alleys, driveways, sidewalks and surface parking lots. Stormwater runoff from these areas can produce significant runoff volumes and carry pollutant loads that negatively impact the water quality of surface waterbodies and reduce groundwater recharge because of the loss of soil infiltrative capacity. This handbook is intended to provide the reader with a systematic process to begin reducing the impervious surface footprint of the public right-of-ways and associated off-street surface parking areas.
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