7423

• UCREFRP Catalog Number: 7423
• Author: U.S. Bureau of Reclamation.
• Title: Glen Canyon Environmental Studies Draft Report, September 1987.
• USFW Year: 1987.
• USFW - Doc Type: Washington, D.C.
• Copyright Material: NO

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awareness of the uncertainty induced by a short study
period and the limited range of flow (conditions
available during that period. Also, because little
data were available from the pre-dam period, or from
'the post-dam period prior to 1983, our understanding
of the initial adjustment of resources to dam operation
and status of resources prior to GCES is limited. The
GCES also spanned a period of change in dam operations,
limiting our ability to predict future conditions from
past trends. Our projections of long-term system
responses have necessarily been based upon study of a
limited number of sites over a relatively short period
of time. Nonetheless, we believe that collection of
data at more locations over a longer time period would
not change the major conclusions that (1) dam
operations affect downstream resources, and (2)
modified operations would better protect resources.
Additional data collection, however, would permit us to
refine our estimates and increase the certainty of our
forecasts.

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