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<br />f\:) <br />o <br />CO CONTENTS <br />--I <br /> <br />Abstract----------------------------------------------------------------- <br />Introduction------------------------------------------------------------- <br />Purpose and scope--------------------------------------------------- <br />History and effects of water-resources development------------------ <br />Previous investigations--------------------------------------------- <br />Acknowledgments----------------------------------------------------- <br />Data availability-------------------------------------------------------- <br />Mass-balance estimation of natural dissolved-solids discharge------------ <br />Development of a statistical method for estimation of natural dissolved- <br />solids discharge----------------------------------------"~------------- <br />Selection of independent variables---------------------------------- <br />Selection of model form--------------------------------------------- <br />Evaluation of seasonal variation------------------------------- <br />Comparison of model estimates to mass-balance estimates-------- <br />Selected model------------------------------------------------- <br />Sensitivity to mass-balance estimates-------------------------- <br />Revisions to the selected model------------------------------------- <br />Equalization of residual variance------------------------------ <br />Detransformation and bias correction--------------------------- <br />Outline of the statistical method----------------------------------- <br />Estimation of natural dissolved-solids discharge using the statistical <br />method----------------------------------------------------------------- <br />Verification of the statistical model------------------------------------ <br />Summary------------------------------------------------------------------ <br />References--------------------------------------------------------------- <br />Supplemental information------------------------------------------------- <br /> <br />FIGURES <br /> <br />Page <br />1 <br />1 <br />3 <br />5 <br />6 <br />6 <br />7 <br />8 <br /> <br />13 <br />13 <br />16 <br />17 <br />18 <br />23 <br />23 <br />24 <br />24 <br />26 <br />28 <br /> <br /> <br />29 <br />40 <br />42 <br />45 <br />47 <br /> <br />Page <br /> <br />Figure 1. Map showing location of the Upper Colorado River Basin and <br />sites selected for analysis in this study------------------ 2 <br />2-3. Plots of: <br />2, Residuals versus predicted dissolved-solids discharge for <br />sites 1, 3, and 9 used in model testing------------------ 25 <br />3, Weighted residuals versus weighted predicted dissolved- <br />solids discharge for sites 1, 3, and 9 used in model <br />testing-------------------------------------------------- 27 <br />4-8. Plots of monthly mean natural dissolved-solids concen- <br />trations for sites along: <br />4. The Colorado River and the Gunnison River------------------ 35 <br />5, The Green River and the Colorado River at Lees Ferry, <br />Ariz.---------------------------------------------------- 36 <br />6, The San Juan River and the Colorado River at Lees Ferry, <br />Ariz.---------------------------------------------------- 37 <br />7, Tributaries of the Green River----------------------------- 38 <br />8, The Dolores and the San Rafael Rivers---------------------- 39 <br />9. Graph showing comparison of estimated and measured dissolved- <br />solids discharge for samples collected during water years <br />1905-6----------------------------------------------------- 43 <br /> <br />iii <br /> <br /> <br />