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<br />Survey reports, "Water Resources Data for Colorado, Part 1. Surface Water <br />Records. " <br /> <br />l\) <br />~ <br />--1 <br />w <br /> <br />Data on qual ity of sUI"face water are given in the U.S. Geological Survey <br />Water-Supply Paper series "Qual ity of Surface Waters of the United States," <br />which is released in an annual series in numbered parts as determined by <br />natural drainage basins. Data for COLORADO are in Parts 6, 7, 8, and 9. <br />Beginning with the 196/1 Vlater year", these data also arc being publ ished an- <br />nually, on a State basis, '3S U.S. Geological Survey reports, "Water Resources <br />Dilta for Colorado, Part 2. Water Qual ity Records." Another annual Water- <br />Supply Paper series, Vlhich was published until 1966, is "Quality of Surface <br />Waters for Irrigation, Western United States." <br /> <br />Durat ion Data <br /> <br />Flow duration ilnd specific-conductance duration were run for' the seven <br />stations for the entire period of record. Where greater than 20 percent of <br />this specific-conductance data for any 1 year is missing, ,estimates of the <br />missing data were milde using the specific conductance versus discharge re- <br />gression. The duration of daily discharge for the year ending September 30, <br />09095500 Colorado River near Cameo, Colo., is summarized in table 1, and the <br />duration of daily specific conductance for the year ending September 3D, <br />09095500 Culordou River Iledr Cdllleu, Culu. I i~ ~Uillflldl iLeu in ldblt: 2. <br /> <br />Regression Equations of ,later-Qual ity Data <br /> <br />Regression equations of discharge versus specific conductance, specific <br />conductance versus calciunl, magnesium, hardness, sodium, bieat-bonate, chlo- <br />ride, dissolved sol ids, and sulfate were determined for each station, and are <br />shoVln in table 3. The relation between discharge and specific conductance, <br />09095500 Colorado River near Cameo, Colo., is shown on figure 2, and the <br />relation betIYeen specific conductance and dissolved solids, 09095500 Colorado <br />River near Cameo, Colo., is shown on figure 3. <br /> <br />Salt-Load Computat ions <br /> <br />The annual salt loadings in streamflow in and out of Grand Valley have <br />been computed by multiplying the discharge-weighted annual concentration, in <br />tons per acre-foot, by the annual flow, in acre-feet, for the several inflow <br />and outflow stations. The dischar"ge-weighted annual concentr'ation, in tons <br />per acre-foot, was determined by five methods as follows: <br /> <br />4 <br /> <br />.. ~ 'L." <br /> <br />. ..,. .".'d" -'_ ""'"~"'''_''.''__' ~ .... <br />