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<br /> <br />. <br /> <br />~ <br />N <br /><..0 <br />N <br /> <br />Method A.--The tons per acre-foot values were obtained from the composite <br />analyses that were available for each stream station to the 1969 water year. <br />After 1969, compositing of daily samples was discontinued. Three composite <br />samples were usually prepared each month by mixing together equal volumes of <br />dai ly samples collected from the 1st to the 10th, from the 11th to the 20th, <br />and during the remainder of the month, Samples were sometimes composited for <br />shorter periods on the basis ,of specific conductance of the daily samples, A <br />discharge-weighted average analysis for the year is computed from the compos- <br />ite sample analyses and approximates the composition of all of the water that <br />passed the station during the year. The annual discharge-weighted concentra- <br />tion, in tons per acre-foot, is multiplied by the acre-feet of flow for the <br />year to give the salt load, in tons, that passed that site during the year. <br /> <br />Method B,--The daily dissolved sol ids are multipl ied by the daily flows, <br />in cubic feet per second, and the necessary conversion factor, 0.0027, to give <br />the daily load, in tons. The daily tons are totaled to give the annual load, <br />in tons. To obtain the annual dissolved-sol ids concentration, in tons per <br />acre-foot, the annual tons are divided by the annual flow, in acre-feet, <br /> <br />Method C.--This method uses the daily discharge and the two ,regression <br />equations: (1) Discharge versus specific conductance, and (2) specific con- <br />ductance versus dissolved solids, to compute the annual concentration of dis- <br />~ solved solids in streamflow passing the station and the annual load, in tons. <br /> <br />Methods D and E.--These methods compute the annual concentration of the <br />Colorado River above the Dolores River by subtracting the annual load, in <br />tons, of the Dolores River near Cisco from the annual load, in tons, of the <br />Colorado River near Cisco and dividing this load by the annual flow, in acre- <br />feet, of the Colorado River near Cisco minus the annual flow of the Dolores <br />River near Cisco. This value is then applied to the flow of the Colorado <br />River at the State line, Method D uses the loads for the Dolores and Colorado <br />Rivers computed from daily specific-conductance records at the specified sites <br />as in method B, and method E uses the loads for the Dolores and Colorado <br />Rivers computed from daily discharge records at the specified sites as in <br />method C. <br /> <br />. <br /> <br />5 <br />