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Table 4.--Comparison of results for dissolved-solids record extension [mg/L,.milligrams per liter; dashes indicate no analysis] Record- Base- Observed mean Standard error of estimated extension station monthly dissolved-solids concentration, site site Calibration dissolved-solids in percent number! number! period concentration Weighted Weighted Regression (water (mg/L) t\) years)2 regression regression on dissolved- <:) on stream- on stream- solids con- flow flow at a centration ,..... base at a base ~ station station 1 2 1942-83 350 9 10 5 4 1951-54 1,650 21 7 8 1952-62 390 13 9 8 1957-62 440 8 9 14 1957-62 440 10 10 1951-83 270 19 12 11 1957-83 1,100 17 13 1951-83 510 15 16 15 1947-65 2,570 27 17 18 1955-62 220 16 17 19 20 1942-62 790 11 8 21 1949-83 1,960 9 23 22 1964-83 720 3 24 22 1943-57 720 7 6 lRefer to figure 1 for site location and table 2 for site description. 2Water year is defined as the period from October 1 through September 30 and is designated by the calendar year in which it ends. Table 5.--Summary of record extension for sites included in this study [dashes indicate extension not required; Wtd reg Q, weighted regression on streamflow at the record-extension site; Reg Q, simple regression on stream- flow at a base-station site; Wtd reg B, weighted regression on streamflow at a base-station site; Reg DS, simple regression on dissolved-solids con- centra,tion at a base-station site] Site number1 1 5 7 9 10 12 13 16 17 19 21 23 24 Station name Streamflow Dissolved solids Extension Extension period Method period Method (water ye.ars)2 (water years) 1941 Wtd reg Q 1941-50 Reg Q 1941-50 Wtd reg B 1941-51 Reg Q 1941-51 Wtd reg B 1941-50 Reg Q 1941-56 Wtd reg B 1941-50 Wtd reg Q 1941-42 Reg Q 1941-56 Wtd reg B 1941-50 Wtd reg Q 1941-45 Reg Q 1941-46 Wtd reg B 1941-54 Wtd reg Q 1941 Reg OS 1941-48 Wtd reg Q 1941-63 Reg DS 1941-42 Reg OS Colorado River near Glenwood Springs, Colo. Dolores River near Cisco, Utah Green River near Green River, Wyo. Green River near Greendale, Utah Yampa River near Maybell, Colo. Duchesne River near Randlett, Utah White River near Watson, Utah San Rafael River near Green River, Utah San Juan River near Archuleta, N. Hex. Colorado River at Lees Ferry, Ariz. Virgin River at Littlefield, Ariz. Colorado River below Parker Dam, Ariz.~Calif. Colorado River above Imperial Dam, Ariz.~Calif. IRe fer to figure 1 for site location. 2Water year is defined as the period from October 1 through September 30 and is designated by the calendar year in which it ends. 12