Dams  http://www.pbs.org/wgbh/buildingbig/dam/index.html
This PBS site gives lots of information about dams from basics to deciding if they should be removed.

The Groundwater Foundation Kid's Page  http://www.groundwater.org/kc/kc.html
This site contains information about ground water and its relationship to the water cycle. Activities and experiments are included

Learning to be Waterwise  http://www.getwise.org/wwise/
This site contains facts about water and activities to do with water.

Missouri Botanical Garden Water Cycle Information  http://mbgnet.mobot.org/fresh/cycle/index.htm
This site clearly explains how the water cycle works and also explains the science concepts behind it

Teach the Children Well http://www.teachthechildrenwell.com/science.html#wat
This site has many topics about water as well as other subjects.

Water Cycle Animation http://www.fergusonfoundation.org/watercycle/flash.html
This site launches a water cycle animation

Water Cycle Problem  http://www.teachtsp.com/products/productextras/SCISCI/watercycle.html
This site is a problem solving activity related to the water cycle

Water Science for Schools http://ga.water.usgs.gov/edu/watercycle.html
This site contains background information, glossary, and picture links for different topics related to water.