http://home.clara.net/darvill/altenerg/hydro.htm

http://ga.water.usgs.gov/edu/hyhowworks.html

http://ga.water.usgs.gov/edu/wuhy.html

http://www.howstuffworks.com/hydropower-plant.htm

http://www.tvakids.com/electricity/hydro.htm

http://www.eia.doe.gov/kids/energyfacts/sources/renewable/water.html

http://www.alliantenergykids.com/stellent2/groups/public/documents/pub/phk_ee_re_001504.hcsp