| http://www.w3.org/ns/prov#value | - The U.S. Environmental Protection Agency (EPA) has announced an agreement with the District of Columbia to implement major green infrastructure enhancements to protect the Potomac and Anacostia rivers from stormwater runoff.In modifications to a Clean Water Act permit, the district agreed to undertake innovative measures to stem stormwater flow and pollution, using natural systems such as trees, g
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