A dam is a barrier constructed to contain the flow of water or to keep out the sea. Environmental and engineering issues relating to dams are the focus of web sites categorized here.
Regular Websites
Maintained by the Hydropower Reform Coalition, the purpose of this site is to explain how dams block and change rivers, showing how a badly managed dam can be identified, and to present ways in which dams can be improved, and rivers restored. - Dam Effects
http://www.dameffects.org/
Presented by National Geographic, this interactive site allows visitors to investigate the reasons why, and how, people build dams, exploring the benefits as well as the negative impacts that a dam might have on a community. Classroom ideas, family activities, a discussion forum, and other resources are available. - Geoguide Dams
http://www.nationalgeographic.com/resources/ngo/education/geoguide/dams/
The WCD is an independent, international organization which addresses controversial issues associated with the construction and maintenance of large dams. The WCD Report may be ordered in printed form or downloaded in PDF format, available in English or Spanish. Global studies and other research data may be accessed through the site. - World Commission on Dams
http://www.dams.org/