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\)\)~<O~~ tion, such as those reported by Gupta (1974) and Negev (1967), will be revIew- ed, Particular concern will be given to data availability and the calIbration and verification requirements of each model, A particularly useful technique may be to relate sediment yield of a subbasin unit to basin characteristics, such as land use, geology, and geomorphology of that unit (G. C. Lusby, writ- ten commun., 1975). Alternative empirical regression models will be evaluated (see, for example, Jansen and Painter, 1974; Bennett, 1973; Kellerhals and others, 1974), This component will be coordInated with proposed methodologies for remov- al, storage, and revegetation of soil overburden from strip-mining operations. Existing and impending environmental-control legislation and enforcement poli- cies will affect management of all aspects of field operations of the mIning industry, Extent, disposition, and control of windborne (so-called "fugitive") dust needs to be considered, particularly wIth respect to vegetation removal or changes affecting the land surface. (See section on air quality.) The extent to which the material. is removed from the basin by way of air or water needs to be established, and, to the extent possible, natural versus human-induced components distinguished. Sal inity Long-term streamflow chemical-quality data are available at down-stream points of both the Yampa River and the Little Snake River. Analysis of data for the Yampa River near Maybell, Colo., using regression analysis indicates a significant long-term increase in dissolved-solids concentration, which may have been the result of increased irrigation along the mainstem Yampa River (Steele and others, 1974). Miscellaneous streamflow chemical-qual ity data available at several upstream sites in both subbasins may be of use In model- ing applIcations. Several Federal agencies (primarily the U.S. Environmental Protection Agency and predecessor agencies, the U.S. Geological Survey, and the U.S. Bu- reau of Reclamation) have and are evaluating causes and effects of salinity conditions in the Colorado River basIn, Aided by Federal support funding, Utah State University (Hyatt and others, 1970) has developed an extensIve mod- el for salt loadings of various hydrographic units of the Colorado River ba- sin. Results of this research activity have assisted the U.S. Environmental Protection Agency (1971, 1972) and the U.S. Bureau of Reclamation (1974) in the determination of sources increasing sal inity in the basin and the need for salinity-control projects in order to alleviate conditions in critical problem areas. Results of these studies are to be incorporated into the Phase-f I assessment. A salt-routing model developed by Ribbens (1975) for the Colorado River basin will be considered for adaptation to the Yampa RIver basin system, In this mass-balance model, major sources and sinks of dissolved solids in the system need to be identified, before the effects of increased irrigation or increased salinity through consumptive water use can be simulated. 21 '.