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Hydroelectric Dams in Vermont Watersheds

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Title: Hydroelectric Dams in Vermont Watersheds


1
Hydroelectric Dams in Vermont Watersheds
By Charles Opel
Pictured Vernon Dam Source U.S. Fish
Wildlife Service
2
Project Goals
  • Examine the level of development of hydroelectric
    infrastructure in Vermont watersheds.
  • Define patterns of distribution of dams among
    watersheds of the basin and sub-basin level.
  • Identify categorical distinctions among Vermont
    hydroelectric dams and analyze the spatial
    expression of these differences.

3
Source Data
  • All layers come from the VCGI achieves.
  • Extracted subset of the 2005 Vermont dams
    inventory (EmergencyOther_DAMS) as point
    features.
  • Polygon layer of sub-basin watersheds in Vermont
    (WaterHydro_WBD8VT).
  • Vermont state boundary polygon layer
    (BOUNDARY_VTBND_POLY).
  • Extracted subset (lakes and ponds) of Vermont
    surface waters polygon layer (WATER_DLGLAKE_POLY).

4
Methods
  • To create my layer of watersheds within Vermont I
    clipped my sub-basin polygon layer to the layer
    of Vermont state boundaries. For display
    purposes, I left the full-extent sub-basin layer
    beneath the newly created layer.
  • I used an attribute query to find active
    hydroelectric dams, the layer resulting from this
    selection became the basis for my subsequent
    analysis.
  • My most important analysis resulted from a
    spatial join of my active hydroelectric dam point
    layer to my Vermont watershed polygon layer. The
    output polygon layers of these spatial joins
    contains a count attribute for active
    hydroelectric dams within each basin or sub basin
    (I did this operation for both levels of
    watershed).
  • My basin-level polygon layer was created by
    dissolving the sub-basin layer by the basin name
    attribute NOT by downloading a separate
    basin-level layer.
  • Finally, I classified active hydroelectric dams
    by a number of distinguishing attributes year
    of construction, type of ownership, and whether
    the dam is a dedicated hydroelectric facility or
    a mixed-use facility.

5
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6
Ownership types of hydroelectric dams as
percentages of the whole
7
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8
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9
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10
Status of non-active dams as percentage of the
whole
11
Further Study/Uncertainty
  • Spot-checks to determine accuracy of dam data.
  • Introduce data regarding flow/precipitation/genera
    ting capacity into analysis.
  • Find appropriate layer of rivers and streams.
    The lack of this layer is the most obvious
    shortcoming in my project.
  • Incomplete attribute tables.
  • Discrepancies in attribute tables.
  • Basin layer created by dissolving sub-basin
    layer.
  • Exclusionary querying philosophy much more likely
    to have produced false negatives than false
    positives.
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