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. e e o~n 1 ~9 Inspection of historic flows for the water years 1945-1950 (for which concurrent data is available at these four stations) shows an average loss of -25,000 acre-feet between these stations, Average annual flows and differences for water years 1945-1950 at these stations are given in Table 6, Station Table 6 Differences in flow Historic period of concurrent data Water Year 1945 1946 1947 1948 Annual Flows (1,000 Acre-Feet) 429.1 397.2 544,1 673,2 09114500 II 1949 1950 539,0 469,5 81,2 60,0 244,4 219,7 242,7 224,5 -29,3 -34,7 -09114000 66,8 48,4 79,0 93,4 -09112500 216,8 194,0 270,9 279.8 -09110000 Difference: Averag e Difference: -25.05 11Gunnison River near Gunnison (09114500)minus Ohio Creek near Gunnison (09114000)minus East River at AImont (09112500) minus Taylor River at AImont (09110000). 155,8 -10,3 191.3 -36,S 317,2 -17.2 216.5 -22.3 Discussion with USGS personnel indicated no known gaging problems at these sites, Average annual flow for the Gunnison River near the Gunnison station (09114500) for water years 1945-1950 is 508,700 acre-feet, A five percent gaging error would represent 25,400 acre-feet, Why this error would consistently occur on the Jaw side, however, is not known, The third difference file was developed for the stations above Tomichi Creek at Gunnison (09119000) and below the Tomichi Creek at Parlin (09117000), Quartz Creek near Ohio (09118000), and Cochetopa Creek near Parlin (09118500) (see Figure 1), Core station files used in developing this difference file are listed in Table 7. 14