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Transcript of Hetch Hetchy
Samuel Resendez The Effects of Damming on Earth Hetch Hetchy and what it is The Effects of the Dam Salmon in the food web Without the salmon: zoo plankton & phyto plankton The Solution Yosemite National Park is considering breaching the dam.
Many environmental organizations are trying to get approval for the breach. The Phosphorus Cycle Phosphorus in rocks
earth. Is located in the northwest corner of yosemite national park
Formerly a valley, that was dammed in 1923
It is in the chaparral biome
After the dam, it became a reservoir, fed by Tuolomne River Before the Dam: After the dam: Salmon, and How they're affected Salmon populations have dropped due to the creation of the dam
It creates problems for salmon returning to their spawning grounds
Many ecosystems reliant on salmon are beginning to collapse.
According to Dale Mitchell, breaching Hetch Hetchy dam would be a "keystone to bringing back California's salmon fisheries"(Loyd). Chaparral A biome found primarily in California
Covers 5% of California's land area
A biome with unique flora and fauna
Fires are very infrequent.
Damaged easily by overgrazing For example: zoo plankton Phyto plankton Chub & Smelt predatory birds Salmon & trout Smelts and Chubs Water Fowl predatory birds Sun Works Cited: The dam destroyed the Hetch Hetchy valley
Populations of local flora and fauna have declined
Many ecosystems are beginning to change, and even collapse Uptaken by plants How the phosphorus cycle is affected:
Since sediment is being stopped at the dam, areas downstream of Hetch Hetchy are Phosphorus deprived.
Artificial phosphorus is being put into the reservoir due to dam maintenance and tourism. dissolves into water consumed by animals http://www.mountainproject.com/images/10/77/107751077_medium_49fc64.jpg
400.jpghttp://www.fs.fed.us/r6/fishing/regional/fishresources/images/sockeye.jpghttp://eo.ucar.edu/kids/green/cycles7.htm images: "The Plan." The Plan. N.p., n.d. Web. 01 Dec. 2012. <http://www.hetchhetchy.org/theplan>.
Usinger, Robert L. The Life of Rivers and Streams. New York: McGraw-Hill, 1967. Print.
Barss, Karen. Clean Water. New York: Chelsea House, 1992. Print.
Vogtthe, Tom. "WSUV Gathering to Focus on Dams." The Columbian [Vancouver] 29 Oct. 2009:
http://yosemiteblog.com/2009/08/23/demolishing-hetch-hetchy-could-save-californias-salmon-population-or-not/ websites: print sources: Allaby, Michael. Water: Its Global Nature. New York: Facts on File, 1992. Print.
Righter, Robert W. The Battle over Hetch Hetchy: America's Most Controversial Dam and the Birth of Modern Environmentalism. New York: Oxford UP, 2005. Print. Populations may decline O' Shaughnessy dam provides water for 2.4 million people in the Bay area. It also provides 500 megawatts of electricity.
This accounts for 1% of California's energy use in the Summer. John Muir who protested against the damming of Hetch Hetchy said, " These temple destroyers, devotees of ravaging commercialism, seem to have a perfect contempt for Nature, and, instead of lifting their eyes to the God of the mountains, lift them to the Almighty Dollar. The process The whole basin of Hetch Hetchy was cleared of trees, leaving stumps.
Scum pooled on the banks of the valley.
The whole basin was ravaged by mechanical equipment, releasing lots of Carbon Dioxide into the atmosphere. Erosion Erosion is causing sediment impoundment
This threatens to break dams.
This erosion causes large amounts of phosphorus build up in reservoirs. Impounded