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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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Presentation Transcript
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
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.