WSP12135

• File Number: 8210.766
• Description: Gunnison River General Publications - Correspondence - Reports - Etc
• State: CO
• Basin: Yampa/White
• Water Division: 6
• Date: 1/1/1996
• Title: Key Documents - Regulated Rivers - Research and Management - Volume 12 - 391-413 - A General Protocol for Restoration of Regulated Rivers
• Water Supply Pro - Doc Type: Report/Study

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J. A. STANFORD ET AL.

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Figure 4. (a) Discharge of the Columbia River, USA, in the Hanford Reach, an eighth-order segment in the piedmont transition (s~
Figure 2) between Priest Rapids and the confluence of the Snake River. for the period 1920-1929 when no large storage dams were pre-
sent upstl'e-am. In the top panel the solid line is mean daily discharge plaited for each day of the water year beginning] October and
ending 30 September, and the broken line pIon standard error. These data were used to calculate average daily change in discharge (mid-
dle panel) .md average percentage daily change (ball om panel) (b) Same as (a), except data are for the period 1983-1992. when the flow
of lhe Columbia River in thIS reach was regulated by Priest Rapids and other dams ups[ream (derived from US Geological Survey data,
Reston, Virginia. USA)

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mountain valley floodplains, thereby severing the river continuum. Mass transport dynamics that create
instream and floodplain habitats for riverine biota are drastically altered. Flood peaks are eliminated,
daily discharges arc more variable (e,g, Figure 4) and temperature seasonality may be reduced or lost
(Stanford and Hauer, 1992; Blinn ef al., 1995).

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