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<br />~ <br />~$ <br />~.' <br /> <br />~ <br /> <br />" <br /> <br />Our onderstanding of the Relationships Between <br />Daa Operations ADd Downstre.. Resource. Is Not <br />Complete <br /> <br />, <br /> <br />l <br /> <br />. <br /> <br />The limited time available for the Glen Canyon <br />Environmental Studies increases the uncertainty of <br />long-term predictions made from data collected during <br />the study. The coincidence of the GeES with high flows <br />that were not typical of pre-1983 releases limited our <br />ability to determine the response ot resources to low <br />and tluctuating flows. These high releases required <br />major changes in research design as the studies were in <br />progress. We believe, however, that the more general <br />conclusions that dam operations aftect downstream <br />resources and that moditied operations would better <br />protect these resources, would not change due to these <br />uncertainties. <br /> <br />i: <br />" <br /> <br />~ <br /> <br />~ <br />~ <br /> <br />c <br />t~ <br />1 <br />~ <br /> <br />Nowhere were time and flow limitations more strongly <br />felt than in determining the ettects ot dam operations <br />on the humpback chub. The legal and biological status <br />ot this species makes decisions based on inadequate or <br />incomplete information particularly dangerous. In th~s <br />respect, we have erred on the side of caution and wish <br />to reemphasize the need tor turther studies with <br />appropriate flow regimes to correctly assess the <br />etfects ot dam operations on this endangered species. <br /> <br />~ <br /> <br />,; <br /> <br />~. <br /> <br />~.~ <br /> <br />i~ <br /> <br />~? <br /> <br />t~ <br />f <br /> <br />~ <br />. <br />~~ <br /> <br />'.". <br />~ <br />~~. <br /> <br />~t, <br />~ <br />~ <br />% <br />~ <br />~ <br />~ <br /> <br />~ <br />