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Last modified
7/14/2009 5:02:36 PM
Creation date
6/1/2009 11:56:52 AM
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UCREFRP
UCREFRP Catalog Number
9505
Author
Cooper, D. J. and C. Severn.
Title
Wetlands of the Escalante State Wildlife Area on the Gunnison River, Near Delta, Colorado
USFW Year
1994.
USFW - Doc Type
Hydrology, Water Chemistry, Vegetation, Invertebrate Communities, and Restoration Potential.
Copyright Material
NO
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Figure 7 shows that the per-dam flows were significantly <br />different than the post-dam flows, In addition, the pre-dam <br />regression lines are steeper than the post-dam regressions, <br />indicating that the larger water years have larger differences in <br />flows between the two periods of record. Large water years have <br />approximately 2,500,000 acre feet of total flow, and a peak flow <br />of approximately 18,000 cfs in the pre-dam period. However, a <br />water year with this same total annual flow would have a peak <br />flow of only 10,000 cfs in the post dam period. This is the <br />difference between flooding and not-flooding in the study-area. <br />Reduced flood frequency has a number of repercussions, <br />including; (1) reduced floodplain dynamics resulting in fewer <br />backwaters and oxbows being created and maintained, (2) fewer <br />sites suitable for cottonwood regeneration, (3) reduced frequency <br />of connection with existing backwater and oxbows, (4) reduced <br />flushing of floodplain soils to remove salts. Although it seems <br />that this later point is of less importance, we have found that <br />portions of these floodplains are not completely connected to the <br />Gunnison River, and groundwaters in close proximity to the <br />floodplain may contain high salt concentrations. <br />The fact that neither May nor June flows retain their <br />natural peak pre-dam condition is not encouraging. In fact these <br />flows are very different. It indicates that floodplain dynamics <br />are at a standstill, and the integration of native fishes into <br />the floodplain will be possible on a very irregular basis, unless <br />flows of greater than 12,000 can be restored. <br />13 <br />
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