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<br />
<br />Acknowledgements
<br />Support for preparation of this report was provided
<br />largely by the U.S. Bureau of Reclamation and the
<br />Municipal Subdistrict, Northern Colorado Water
<br />Conservancy District. We thank Charles R. Berry,
<br />Jr., Paul H. Eschmeyer, Wayne A. Hubert, Paul
<br />C. Marsh and Timothy Modde, as well as anony-
<br />mous reviewers and other colleagues, for their use-
<br />fulcomments during the development of the manu-
<br />script. Responsibility for the hypothesis advanced
<br />here is of course solely that of the authors.
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