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).
1 National Airport is the most convenient of the area airports for visitors staying in the heart of the city and residents who live in the downtown area. 2  The airport is accessible by Metro. 3  Use the Yellow or Blue Lines to take you directly to the Ronald Reagan Washington National Airport Metrorail station.