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Considerations Related to Equal Monthly Volumes
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Considerations Related to Equal Monthly Volumes
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7/25/2012 3:55:08 PM
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7/25/2012 3:52:35 PM
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Water Supply Protection
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Considerations Related to Equal Monthly Volumes
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Considerations Related to Equal Monthly Volumes
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1 <br />• The presentation by GCMRC included no description of modeling uncertainty, which is likely to <br />be at least 20 %, if not much more. Sediment transport models can have considerable <br />uncertainty associated with model parameters and stochastic effects in the river. Given this <br />uncertainty, the apparent differences in model projections among the scenarios may not be <br />real. <br />• The 1996 GCD EIS describes sediment deposits as "very important for cultural, recreational and <br />biological resources." 3 Ecological goals in the Grand Canyon should be focused on sediment to <br />the extent that it provides the necessary conditions to support the goals; sediment itself is not a <br />goal. The GCDAMP has yet to determine the relationship between sediment retention, tributary <br />inputs, the availability of backwater habitat for native fish in Grand Canyon, and the area of <br />recreational beaches. <br />• Currently, GCMRC is conducting a near -shore ecology study. This study will assist us in <br />understanding the degree to which humpback chub use backwater habitats in the Colorado <br />River mainstem. The extent to which humpback chub utilize various mainstem habitats is <br />important to understanding their ecological role. For example, talus slopes may be more <br />important than backwaters to young -of -year and juvenile fish. Although fish have been <br />observed in backwaters in the past, it is unclear how important they may be to the survival and <br />recovery of the species. <br />• New sediment inputs may or may not increase backwater habitats. Moreover, endangered fish <br />may or may not preferentially use these habitats. Before implementing expensive management <br />actions (EMV) in an attempt to improve fish habitat, we suggest that these links need to be <br />further considered through research studies such as the near -shore ecology study. <br />s Operation of Glen Canyon Dam f=inal Environmental Impact Statement, March 1995, page 72. <br />3 <br />
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