The diagram shows this better than I can explain it. At a gage height of 1 foot, our stream has the amount of water (flow) represented by the blue area. Let's say it rains and the water rises to 2 feet. The additional flow is represented by the green area.
Closest Airport to Washington, D. C., DC. The closest airport to Washington, D. C. is Ronald Reagan Washington National Airport (DCA). Distance from Ronald Reagan Washington National Airport to Washington, D. C., DC is 4,8 kilometers (3,0 miles).
Best Answer: The closest airport to Washington, DC (includes the Smithsonians) is Reagan National Airport. Best Metro is the blue line to Smithsonian Stop, about a 20 minute ride. Please pick a Best Answer, even if it is not mine. That way we can tell if we really do help people.