1. Damns by Sarah and Allen JUST KIDDING WE KNOW HOW TO SPELL DAM

2. How  Disadvantages  Case studies By Clip Art

3. Why do we build dams?  Dams can store rain water or water directly from the river itself. Then, in case of a Drought, the dam will still have a relatively constant supply of water.  Producing Power.  Controls flooding & provides recreational activities such as boating fishing and swimming, if the lake is not being used for drinking water (Dam Society).  Simple design makes for inexpensive repairs and maintenance costs (Dam Society). From: http://www.waterencyclopedia.com/images/wsci_01_img0129.jpg

4. Advantages of Building a Damn  Simple design makes for inexpensive repairs and maintenance costs (Dam Society).  Produce inexpensive (after completion) and clean power.  Renewable energy source, because the water is not destroyed by passing through the dam.  If needed, dams can be shut down instantly, where thermal plants take hours, and nuclear plants can take days! (Dam Society).  Very few breakdowns. From: http://www.waterencyclopedia.com/images/wsci_01_img0129.jpg

5. River diversion and the Aral sea  Aral Sea in Central Asia.  Evaporation matched by inflows of water from the Amu Darya and Syr Darya rivers.  1960 building of dams  eliminated the flow of water into the sea From: http://landsat.gsfc.nasa.gov/graphics/img/f00 12.jpg MORE INFO

6. From: http://landsat.gsfc.nasa.gov/graphics/img/f00 12.jpg

7. River diversion and the Aral sea  1995, the area of the Aral Sea was only 30,000 square kilometers,  1960 64,500 square kilometers.  fishing industry which once supported 60,000 workers  halt  20 of the 24 fish species once caught in the sea have been extinct  bird species found in the Amu Darya Delta had declined from 319 to 168,  the delta forests had died  only 30 out of 70 species of mammals remained. From :http://malaysiafishingtour.com/wp-content/uploads/2010/11/Fresh-Water-Fish.jpg

8. Sediments & Erosion From: http://www.ape rfectworld.org/ clipart/Nature/ri ver02.GIF

9. Sediments & Erosion From: http://www.ape rfectworld.org/ clipart/Nature/ri ver02.GIF velocity of the water drops Sediment carried by the river  dropped erosive potential of the river is increased sediment deprivation affects shoreline processes and biological productivity of coastal regions.

10. Grand Canyon  Grand Canyon below Glen Canyon Dam –1963  Erosion of the sediment along the beaches began because of the lack of incoming sediment.  Beaches disappeared!!  1996 project  recovered beaches but was short-lived Want to know more?

11. From:http://1.bp.blogspot.com/_gbzApcV7MwY/SNE64u2XpgI/AAAAAAAAAQI/jCxvHTL0jAI/s400/nemo_4.jpg From: http://www.ape rfectworld.org/ clipart/Nature/ri ver02.GIF

12. Columbia River  averaged between 10 and 16 million fish before non-native settlers first arrived in the 19th century.  130 or so dams in the basin,  1.5 million salmon and steelhead enter the Columbia each year Thirsty for more knowledge??!!

13. Works cited  " Dams - Impact Of Dams - Water, River, Flow, Sediment, Colorado, and Lake." Science Encyclopedia. N.p., n.d. Web. 14 Apr. 2011..  "Dams and Migratory Fish | International Rivers." International Rivers. N.p., n.d. Web. 14 Apr. 2011..  "Hydrological Effects of Dams | International Rivers." International Rivers. N.p., n.d. Web. 14 Apr. 2011..  "Hydrology | Carl Renshaw." Dartmouth College. N.p., n.d. Web. 14 Apr. 2011..  "PROS AND CONS." Sir Francis Drake High School Website. N.p., n.d. Web. 14 Apr. 2011.