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Paula Phillips <br />January 26, 1987 <br />Paqe 3 <br />' The Minnesota Creek flow records (1936-1947) and the Dry Fork and Lick <br />Creek flow records (1977-1984) are not coincidental. A comparison of the <br />flows at the North Fork Gunnison River gage near Somerset was made to <br />determine if the flows for the two periods were similar. A summary of <br />annual flows at the North Fork Gunnison River gage is presented below: <br />Annual Flow <br />' North Fork Gunnison % of Long Term Average <br />1937-1984 326,000 AF 100% <br />1936-1947 338,920 AF 104% <br />1977-1983 373,248 AF 119% <br />1977 79,270 AF 24% <br />' 1983 565,100 AF 173% <br />1984 601,800 AF 185% <br />' Note that the average flow between the two periods used for correlation <br />varies by about 10%. However, the 1977-1984 period covered a period of <br />extremes from a 24% of normal runoff in 1977 to a 185% of normal runoff in <br />' J 1984. <br />' Comparisons show average monthly flows for the two periods, after adjust- <br />ments were made for Paonia Reservoir operations, differed significantly <br />' during the snowmelt run-off months of April thru July. However, the aver- <br />age monthly flows for the remainder of the year, including the late irriga- <br />' tion months when a call is most likely to occur, are within 10 percent of <br />each other. We expect that the Minnesota Creek Basin would have experienc- <br />ed a similar flow pattern. <br />A summary of adjusted monthly flow comparisons is as follows: <br /> Average Average $ <br />Month 1936-1947 1977-1983 Difference <br />January 3,829 3,517 -8.2 <br />February 3,835 3,696 -1.2 <br />March 7,383 7,343 -0.6 <br />April 48,450 55,291 +14.1 <br />May 135,838 120,343 -11.4 <br />June 83,582 114,130 +36.5 <br />July 23,300 35,823 +53.7 <br />August 8,846 9,753 +10.2 <br />September 6,320 6,487 ~+2.6 <br />October 7,273 6,836 -6.0 <br />November 5,653 5,383 -4.8 <br />December 4,711 4,696 -1.4 <br /> ....,~~.Y.. <br />