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Renewed permit to help ease stormwater runoff n Oct. 7, the Environmental Protection Agency reissued a Municipal Separate Storm Sewer System (MS4) Permit to the District, providing a comprehensive plan to reduce stormwater runoff and decrease the pollution of local waterways.
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A minimum of 350,000 sq. ft. of green roofs across D.C.
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An incentive program to encourage green landscaping.
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Retention of 1.2 inches of stormwater for development projects of at least 5,000 sq. ft.
The renewed permit requires, among other things, an increase in D.C.’s tree canopy and more green roofs to help control 90 percent of all stormwater runoff, one of the main perpetrators of river pollution.
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Taking into account suggestions from Casey Trees, the District Department of the Environment and Anacostia Watershed Society, the permit outlines practices that help ensure the District’s compliance with the Clean Water Act. Requirements laid out by the permit include: A requirement to add at least 4,150 trees annually to D.C.
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Urban Tree Canopy Goal
Casey Trees’s low-impact development features, including its three green roofs, can handle an eight-inch rain event.
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7 Citizen Forester Spotlight
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November 2011
18 million sq. ft. of impervious surface drainage.
The MS4 Permit is an important step in the ongoing process of cleaning up the District’s waterways. An increase in D.C.’s gray infrastructure after the 1970s created an upsurge in stormwater runoff. As a result, pollution of the local water systems — namely the Anacostia and Potomac Rivers — became even harder to control. Adding trees and other forms of green infrastructure can help D.C. achieve cleaner, healthier and more beautiful waterways.
October’s tree plantings are in the books and here is our progress towards D.C.’s Urban Tree Canopy Goal as of Nov. 1. Casey Trees-planted trees in 2011:
0 1, 5 1 8 Casey Trees-planted trees since 2002:
1 0, 6 9 7 Trees planted by all since 2002:
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Spotted! Volunteers from the Oct. 15 planting in Capitol Quarter. Check out more photos of Casey Trees plantings on Flickr.