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<br />1\. <br />-.1 <br />r.;. <br />o <br /> <br />into Reed Wash throughout the <br />year. Subsequently, annual stream- <br />flow and dissolved-solids loads <br />have decreased in Reed Wash. <br />The dissol ved-solids loads <br />presented in this fact sheet are con- <br />sidered estimates. Assuming the <br />errors in streamflow measurements <br />and water-quality data and errors in <br />the computation method are rela- <br />tively consistent for the study <br />period. then the load differences <br />between the 1973-83 and 1991-96 <br />study periods should be reasonable <br />approximations of changes in dis- <br />solved-solids loads. Also, the <br />decreases in dissolved-solids loads <br />reported for the four streams can- <br />not be interpreted as a direct mea. <br />sure of the actual salinity <br />(dissolved.solids) decreases <br />attained by Federal salinity-control <br />projects in those four basins. There <br />could have been some long-term <br />changes in crops. water use. and <br />irrigated acreage in these areas that <br />were not related to the sal i nit y- <br />control program. However, results <br />of this study indicate that, since the <br />implementation of salinity-control <br />projects. dissolved-solids loads <br />have decreased in four streams that <br />drain irrigated agricultural areas in <br />the Grand Valley. <br /> <br />References Cited <br /> <br />Bureau of Reclamation. 1978. Stage One <br />development. Grand Valley Unit, <br />definite plan report-Appendi< B. <br />hydrosalinity. land resource. eco- <br />nomics: Sail Lake City. five nurn. <br />bered sections plus attachments. <br /> <br />_1985, Grand Valley Unit, Stage Two <br />development. final environmental <br />impact statement: Bureau of Recla- <br />mation Report INT FES86-IO. <br />217 p. <br /> <br />Butler. D.L.. 1996. Trend analysis of <br />selected water-quality data associ. <br />aled with salinity-control projects in <br />the Grand Valley. in the lower Gun- <br />nison Ri ver 8asm. and at Meeker <br />Dome. western Colorado: U.S. Geo- <br />logical Survey Waler-Resources <br />Investigations Report 95-4272. 38 p. <br /> <br />Butler. D.L.. Wright. WG.. Stewart. K.C.. <br />Osmundson. H.C . Krueger. R.P.. <br />and Crabtree. D.W., 1996. Detailed <br />study of selenium and other constitu- <br />ents in water. bottom sediment, <br />soil. alfalfa, and bIota associated <br />with irrigation drainage in the <br />Uncompahgre Project area and in the <br />Grand Valley. west-central Colorado, <br />1991-93: U.s. Geological Survey <br />Water-Resources Investigations <br />Report 96-41 38. I 36 p. <br /> <br />Liebermann. TD.. Middelhurg. R.F. and <br />Irvine. S.A.. 1987. User's manual for <br />estimation of dissolved-solids con- <br />cenlr~\ions and loads in surface <br />water: U.S. GeologIcal Survey <br />Water-Resources Investigations <br />Report 86-4124. 51 p. <br /> <br />U.S. Department of the Intenor. 1995. <br />Quality of water-Colorado River <br />Basin: Salt Lake City. Bureau of <br />Reclamation. Upper Colorado <br />Region. Progress Report 17. 96 p.. <br />plus appendix. <br /> <br />U.S. Geological Survey. 1974-83. Water <br />resources data. Coloradu. water <br />years 1974-83, v. 2. Colorado <br />River Basin above Dolores River: <br />US Geological Survcy Water. <br />Data Reports C0-74-2 through <br />C0-83-2. <br /> <br />-David L Bwler <br /> <br />Water Resol/rccs DivisiufI. <br />Grafld JI/flctiofl. Colurado <br /> <br />For more information about this study, write to: <br />Subdistrict Chief <br />U.S. Geological Survey <br />764 Horizon Drive. Room 125 <br />Grand Junction. CO 81506 <br />em.il :dlbut ler@usgs.gov <br /> <br />January 1996 <br /> <br />Fac\ Sheet FS.159.97 <br />