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- \ 6 2. The double-mass plot for annual flows shows very 1 ittle deviation from a straight 1 ine. The period from 1942 to 1952 shows an Increasing flow at Julesburg as compared to the Inflow stations over the long-term average. The trend was reversed for a short period between 1952 and 1956. Since 1957 the annual flows at Julesburg have remained in approximately the same relation- ship to the Inflow sitUation as the long-term average. ... 3. Double-mass curves drawn for individual.months do not show pro- nounced trends or changes in relationships. Slight trends towards a dimi- nished flow at Julesburg as compared to the Inflow at Henderson and below occurred during January and February for the period 1959 through 1966. Likewise, this trend started in 1958 during the months of April, May, July and October. This same trenu is noted during August and September during the period 1952 through 1961, but a noticeable reversal has occurred since 1961. The remaining months have been relatively stable during recent years. 4. The following 1 is t gives the best-fit linear equations and corre- lation coefficients for this re'ationship: Equation Correlation Month (f lows in acre-feet) Coeff I c i ent January Ju 1 esburg = 1.68 (Henderson + measured nflow) - 9,350 0.74 February Julesburg = 1.53 (Henderson + measured n flow) - 2, 180 0.71 March Julesburg = 1.34 (Hende rson + measured nflow) 3,080 0.89 Apri 1 Julesburg = 0.52 (Henderson + measured nfl ow) + 5,840 0.86 May Julesburg = 0.84 (Henderson + measured nflow) - 35,213 0.89 June Julesburg = 0.78 (Henderson + measured n flow) - 28,630 0.92 July Julesburg = 0.53 (Henderson + measured nflow) - 13,530 0.70 August Julesburg = 0.33 (Henderson + measured nflow) - 6,040 0.76 September Julesburg = 0.53 (Henderson + measured nflow) - 5,060 0.90 October Julesburg = 0.89 (Henderson + measured nflow) - 6,020 0.87 November Julesburg = 0.94 (Henderson + measured n flow) - 4,640 0.86 December Ju1esburg = 1.29 (Henderson + measured n now) - 7,130 0.86 ,:. Relationship of Flow at Julesburq with Flow at Denver plus all Measured Inflows below Denver The inflow relationship compared with Julesburg in this analysis is the flow at the Denver gage on the South Platte River plus the Denver sewage effluent plus the discharge at the mouths of Clear Creek, St. Vrain Creek, the Big Thompson River and the Cache la Poudre River. The following items summarize results obtained from these analyses. 1. The relationship between annual flows at the Julesburg station and the annual flows at Denver and below is as follows: Julesburg flow = 0.46 (Denver flow + measured Inflows) - 7,340 acre-feet The correlation coefficient for the 39-year period from 1928 through 1966 was 0.89.