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I~UOfl-rJ 5 1952 shows a slightly Increased flow past the Julesburg gage compared to that which flowed by the Kersey gage. However, the following period between 1953 and 1966 shows a reversal of this trend with a slightly higher flow at Kersey In relationship to the Julesburg flow. None of these variations are large. 3. Double-mass curves drawn for ;ndlvid~al months show the same general pattern as the annual graph. The trend towards a smaller propor- tion of flow at Julesburg in comparison to Kersey Is generally more pro- nouned in the non-Irrigation season. This trend started principally during the years 1959 to 1962. 4. An opposite trend, i.e., a larger flow at Julesburg in comparison with Kersey, has occurred during August and October since 1961. These months tend to cancel out the opposite effect of the other months, resulting In very I ittle show of trend on an annual basis. 5. The following list gives the best-fit linear equat ions and corre- lation coefficients foc the Julesburg and Kersey stations by months: Correlat ion Month [quat ion Coefficient (flows in acre-feet) January Julesburg = 1.80 Kersey 32.780 0.85 February Ju 1 esburg = 1.34 Kersey 12.100 0.75 March Julesburg = 1.22 Kersey 11.550 0.90 Apr i I J u I esburg = 0.53 Kersey + 4.240 0.89 May Julesburg = 0.74 Kersey 16.380 0.93 June Julesburg = 0.75 Kersey 10.190 0.95 July Ju I esburg = 0.63 Kersey 2.640 0.78 August Julesburg = 0.41 Kersey 2.290 0.87 September Ju I esburg = 0.43 Kersey 1.650 0.89 October Julesburg = 0.66 Ker<;ey 5.760 0.90 November Julesburg = 0.68 Ke rs ey 5,830 0.88 December Julesburg = 1.07 Kersey 15,450 0,88 A noticeable feature of these equations is that the slope of the regres- sion line (Julesburg/Kersey) is greater than one during December through March. and less than one during the irrigation season, which is a result of the large amount of diversions between the stations during the irrigation season. Relationship of Flow at Julesburq with Flow at Henderson plus all Measured Inflow below Henderson In the analyses discussed below, the flow at Julesburg is compared with the flow of the South Platte at Henderson plus the n~asured flows at the mouth of the St. Vraln Creek, the Big Thompson River and the Cache la Poudre River. 1. The 1 ine-ar correlat ion coefficient for the 39-year period from 1928 through 1966 for annual flows was 0.87. The best-fit linear equation is as follows: Julesburg flow = 0.73 (Henderson flow + measured inflows) - 66,290 acre-feet.