Reservoir and dam removal
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Reservoir and Dam Removal. Orrin Babcock. Outline. Purpose of Dams Number of Dams in America Dam affect on the environment Selected publication Conclusion. Purpose of Dams. A barrier constructed across a waterway to control the flow or raise the level of water.

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Reservoir and Dam Removal

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Reservoir and dam removal

Reservoir and Dam Removal

Orrin Babcock


Outline

Outline

  • Purpose of Dams

  • Number of Dams in America

  • Dam affect on the environment

  • Selected publication

  • Conclusion


Purpose of dams

Purpose of Dams

  • A barrier constructed across a waterway to control the flow or raise the level of water.

  • freshwater reservoirs, fish hatcheries, hydropower, recreation, irrigation, navigation, and flood control


Reservoir and dam removal

In the United States there are 84,134 dams


Environmental effects

Environmental Effects

  • River’s natural course and flow

    • Limits species present

  • Water temperatures in the stream


Environmental effects1

Environmental Effects

  • Redirect river channels

    • Tennessee Valley Authority (TVA) regulates the Ocoee River

  • Disrupt river continuity

    • Fish ladders


Environmental effects2

Environmental Effects

  • Transform floodplains

  • Sediment Buildup


Selected publication

Selected Publication

  • “Trading off: the ecological effects of dam removal” by Emily H Stanley and Martin W Doyle 2003

  • Study looked at dam removal in the state of Wisconsin

    • Size and geographic limitations can be ignored; results should apply for all sizes and areas.


Dam removal

Dam Removal

  • Species change within two years

    • Reservoir to riverine species

    • Less Common Carp, more bass and darters


Export of sediments

Export of Sediments

  • http://video.nationalgeographic.com/video/player/news/environment-news/us-condit-dam-breach-vin.html

    Elevated levels of sediment can last from days to months depending on the size of the reservoir


Export of sediments1

Export of Sediments

  • Fort Edwards Dam

    • 1st portion removed in 1973

  • Led to elevated levels of polychlorinated biphenyls (PCBs) and oils

  • Clogged Hudson River

  • 2nd portion removed in 1991

    • PCB’s doubled in striped bass


Export of sediments2

Export of Sediments

  • Sediments can be nutrient enriched due to agriculture

  • Sedimentation can have affects as far as 12km downstream


Removal is a trade off

Removal is a Trade-off

  • Dams separate wild and farm raised fish

    • Keeps the gene pools clean

  • Removal restores the stream to its original state

  • It also increases the sediment load and can scour parts of the bank

  • Best to remove them before they fail

    • Save human lives


Conclusion

Conclusion

  • Recent survey of 10 000 flood control dams, over 2200 sites were in need of maintenance

  • The best case scenario for dams that generate limited revenue is to remove them, rather than spend the money to rebuild or repair them.


Personal conclusion

Personal Conclusion

  • Respect Nature, If we didn’t have the desire to live so close to rivers we would have no need to dam them for flood control.


Questions

Questions?


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