Explore man's never-ending quest to control water flow in this documentary hosted by David Macaulay. The film focuses on the significance and power of dam structures such as Egypt's Aswan Dam; explores the reasons for the deadly 1889 flood in Johnstown, Pennsylvania; and reveals the visionaries behind the engineering feats, including Hoover Dam's relentless chief engineer, Frank Crowe. Extras include a mini-dam-building activity for kids.