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<br />002?39
<br />
<br />tion, such as those reported by Gupta (1974) and Negev (1967), wil I be review-,
<br />ed, Particular concern will be given to data availabil ity and the cal ibration
<br />and verification requirements of each model. A part icularly useful technique
<br />may be to relate sediment yield of a subbasin unit to basin characteristics,
<br />such as land use, geology, and geomorphology of that unit (G, C, Lusby, writ-
<br />ten commun., 1975), Alternative empirical regression models will be evaluated
<br />(see, for example, Jansen and Painter, 1974; Bennett, 1973; Kellerhals and
<br />others, 1974),
<br />
<br />This component will be coordinated with proposed methodologies for remov-
<br />al, storage, and revegetation of soil overburden from strip-mining operations,
<br />Existing and impending environmental-control legislation and enforcement poli-
<br />'cies wil I affect management of all aspects of field operations of the mining
<br />industry.
<br />
<br />Extent, disposition, and control of windborne (so-called "fugitive") dust
<br />needs to be considered, particularly with respect to vegetation removal or
<br />changes affecting' the land surface. (See section on air qual ity,) The extent
<br />to which the material. is removed from the basin by way of air or water needs
<br />to be establ ished, and, to the extent possible, natural versus human-induced
<br />components distinguished,
<br />
<br />Salinity
<br />
<br />Long-term streamflow chemical-quality data are available at down-stream
<br />points of both the Yampa River and the Little Snake River, Analysis of data
<br />for the Yampa River near Maybell, Colo" using regression analys is indicates a
<br />significant long-term increase in dissolved-solids concentration, which may
<br />have been the result of increased irrigation along the mainstem Yampa River
<br />(Steele and others, 1974), Miscellaneous streamflow chemical-quality data
<br />available at several upstream sites in both subbasins may be of use In model-
<br />ing applications,
<br />
<br />Several Federal agencies (primarily the U.S, Environmental Protection
<br />Agency and predeces,sor agencies, the U,S. Geological Survey, and the U.S, Bu-
<br />reau of Reclamation) have and are evaluating causes and effects of salinity
<br />conditions in the Colorado River basin, Aided by Federal support funding,
<br />Utah State University (Hyatt and others,' 1970) has developed an extensive mod-
<br />el for salt loadings of various hydrographic units of the Colorado River ba-
<br />sin. Results of this research activity have assisted the U.S, Environmental
<br />Protection Agency (1971, 1972) and the U,S, Bureau of Reclamation (1974) in
<br />the determination of sources increasing sa! infty in the basin and the need for
<br />salinity-control projects in order to alleviate conditions in critical problem
<br />areas. Results of these studies are to be incorporated into the Phase-II
<br />assessment.
<br />
<br />A salt-routing model developed by Ribbens (1975) for the Colorado River
<br />basin will be considered for adaptation to the Yampa River basin system. In
<br />this mass-balance model, major sources and sinks of dissolved solids in the
<br />system need to be identified, before the effects of increased irrigation or
<br />increased salinity through consumptive water use can be simulated.
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