Get your feet wet investigating dams! Contemplate why—and how—people build dams, and explore the good and bad impacts a dam may have on a community. And find questions to probe further.

This look at building a dam complements “Down The Zambezi” in the October 1997 issue of NATIONAL GEOGRAPHIC. The article describes a visit to Africa’s Kariba Dam.

Click on the transit—an instrument used by surveyors to examine the landscape—to get started.

©1997 National Geographic Society. All rights reserved.