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).
This is a list of large cities closest to Washington, DC. A big city usually has a population of at least 200,000 and you can often fly into a major airport. If you need to book a flight, search for the nearest airport to Washington, DC. 1  36 miles to Baltimore, MD.2  124 miles to Philadelphia, PA. 3  147 miles to Norfolk, VA. big city usually has a population of at least 200,000 and you can often fly into a major airport. If you need to book a flight, search for the nearest airport to Washington, DC. 1  36 miles to Baltimore, MD. 2  124 miles to Philadelphia, PA. 3  147 miles to Norfolk, VA.