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).
Reagan National Airport DCA is the closer of the two Washington airports serving the U.S. capital City of Washington, D.C. (the other being Dulles IAD). DCA offers a great view of the Nation's Capital, and quality shopping & dining in both pre-and post-security areas.