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<br />,. <br />Ii: <br /> <br />"'''... <br />n<) <br />- ~ '.- <br /> <br />.~:,' <br /> <br />, <br />, <br /> <br />i <br /> <br />Our Vnderstandinq of the RelationShip. Between <br />Dam Operations And Downstre.. Resource. Is Not <br />Complete <br /> <br />The limited time available for the Glen Canyon <br />Environmental Studies increases the uncertainty ot <br />long-term predictions made from data collected during <br />the study. The coincidence of the GCES with high flows <br />that were not typical of pre-1983 releases limited our <br />ability to determine the response of resources to low <br />and fluctuating 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 affect downstream <br />resources and that modified operations would better <br />protect these resources, would not change due to these <br />uncertainties. <br /> <br />~-:. <br />:--:;: <br />:.:.. <br />., <br /> <br />t: <br /> <br />:'>': <br /> <br />Nowhere were time and flow limitations more strongly <br />felt than in determining the effects of dam operations <br />on the humpback chub. The legal and biological status <br />of this species makes decisions based on inadequate or <br />incomplete information particularly dangerous. In this <br />respect, we have erred on the side of caution and wish <br />to reemphasize the need for further studies with <br />appropriate flow regimes to correctly assess the <br />effects of dam operations on this endangered species. <br /> <br />\;0: <br /> <br />/ <br /> <br />~~ : . <br /> <br />Ii. <br /> <br />;.,:;. <br />.. <br />:;'f <br />~p- <br /> <br />,..... <br />.f::' <br />~ <br />~(.: <br />," <br />:{.\ <br />." <br /> <br />;..~:.. <br />:.. <br />