"70% Of D.C.’s Streams Have Disappeared. Where Did They Go?"
"Washington D.C is a river city, built at the confluence of the Potomac and Anacostia. Once upon a time, it was also a stream city, laced with a vast network of tributaries. Roughly 70% of those historic streams disappeared as the city developed, according to a new District-funded project to document and map the D.C.’s forgotten waterways."