A free showing of three short documentary films on Wednesday will highlight installation of environmentally friendly green roofs in the District of Columbia, efforts to clean up the Anacostia River, and the role of Rock Creek Park as a green oasis in the middle of the city.

A panel discussion will follow with Tommy Wells, director of the D.C. Department of the Environment; George Hawkins, general manager of DC Water; and Peter Ensign, director of DC Greenworks (www.dcgreenworks.org), a nonprofit organization that promotes green roofs and low-impact development.

The three films and their running times are Green Roofs: Riversmart Rooftops (27 min), The Anacostia River: Making Connections (11 min.), and Find Yourself in Rock Creek Park (4 min).

The event, part of the 23rd annual Environmental Film Festival in the Nation’s Capital, will be at 7 p.m. Wednesday at the Carnegie Institution for Science, 1530 P Street N.W.

For more information on the film festival, go to www.dcenvironmentalfilmfest.org.

−Wayne Savage