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<br />BASIC STUDIES <br /> <br />o <br />w <br />~ Studies conducted thus far indicate that there is much variation in <br />~ the amount of pickup from irrigated land. For comparison the analyses <br />in this report are based on values of zero and two tons per acre pickup <br />from new irrigated land. The results of both analyses are shown in <br />Table No. 18. It is assumed that no additional pickup will result from <br />the addition of supplemental water to presently irrigated lands. <br /> <br />B. Streamflow and Quality of Water Measuring Stations <br /> <br />The study period for the 1963 report was from 1941 through 1958, in- <br />clusive; the period for the 1965 report was extended an additional three <br />years through 1961, and the present report includes data through 1964. <br />Both flow and quality records are available for this extended period. <br /> <br />Quality of water and flow records are generally available for the 17 <br />stations selected for this study of the Colorado River Basin. When rec- <br />ords were not available, they were developed by corollary studies fran <br />which data for the periods of missing records were estimated. <br /> <br />Figure No.1, as well as the following descriptions, summarizes rec- <br />ords for the p~riod of study. Basic records used in this report were <br />selected from those obtained by the Geological Survey under a continuing <br />program for collection of water records. Part of the data.collection <br />program is supported by funds transferred by the Bureau of Reclamation <br />to the Geological Survey. <br /> <br />To simplify tabulation, monthly values of flow and total dissolved <br />solids as shown in Tables 1-17 have been rounded to the nearest 1,000 <br />except for concentration values. This rounding resulted in some differ- <br />ences between the recorded and the computed monthly concentrations when <br />the flows were often below 1,000 acre-feet and the loads below 1,000 tons. <br />For example, in the San Rafael and Duchesne drainages and on the Green <br />River near Greendale during the filling of Flaming Gorge Reservoir, some <br />of the flows are less than 1,000 acre-feet per month; hence, some monthly <br />values of concentration shown in the tables differ from those actually <br />recorded because of the method of rounding. Similarly, minor differences <br />from published data in monthly concentrations occur in isolated instances <br />in the flow and quality tables for the other stations. <br /> <br />A brief resume of the source and method of derivation for each of <br />the records shown on Figure No.1 and in Tables No.1 to No. 17, inclu- <br />sive, follows: <br /> <br />Stations with complete records <br /> <br />Records of flow and water quality are available for nearly all of <br />the 1941-64 period for the Green River at Green River, Utah (Table No.5); <br /> <br />20 <br /> <br />