D.C. firefighters helped rescue occupants of cars Saturday evening, after waters rose at low-lying points on two principal thoroughfares.

One rescue came in the 600 block of Rhode Island Avenue NE, where the avenue passes beneath railroad and Metro tracks. Firefighters deployed a flat-bottomed rubber boat in t hat incident.

In the second incident, firefighters went to the aid of occupants of a vehicle stalled in high water in the underpass that carries 16th Street NW below Scott Circle.

About half an inch of rain fell at Reagan National Airport in a brief period between 8 and 9 p.m. according to National Weather Service figures. Much of the area is saturated with runoff from recent heavy rains.