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. . USFWS - Palisade/Grand Junction Stream Flow Analyses - DRAFT May 12, 1995 Page 12 Mid Noyember 1991 - We believe the drop in calculated local inflow to be caused by operations of the Grand VaHey Project at the end of the irrigation season, and high flows outside the 1991 rating curve. October 31, 1992 - Calculations indicate no local inflow even though surrounding days have local inflows of about 300 cfs. We believe an underestimation of the 27.5 Rd Gage . flows was caused by flows outside the range of the defined staff discharge curve (2,800 cfs vs. 2,100 cfs). November 19, 1992 - The local inflows on this day were approximately 90 cfs less than the local inflows on surrounding days. The total flow at the 27.5 Gage also took about a 90 cfs drop when compared to the Palisade gage flow. Since there is little, if any opportunity for drop in the critical reach, gaging equipment failure is suspected. We suspect the Palisade gage because the Government Highline Canal on November 19th, according to Bill Klapwyck (1993), began to build up reservoir storage behind the Cameo roHer dam for power deliveries which should have caused a drop in the recorded Palisade Gage flows as was seen in the 27,5 Rd Gage flows. December 19-28, 1992 - The 27.5 Rd Gage was reported to have been affected by bank ice in the later part of December. August 1-2, 1993 - Calculations indicate no local inflow which we believe was caused by underestimating the 27.5 Rd Gage flows because recorded flows were outside the range of the defined staff discharge curve (2,700 cfs vs. 2,300 cfs). August 24-27, 1993 - Calculations indicate local inflows at 350 on August 24 and then down to 90 cfs on the 27th. We believe this fluctuation is due to precipitation and routing of the storm hydrograph between the gages. See section Diversion Dam Operations versus Local Inflow for further explanation. November 10, 1993 - Calculated local inflow shows a major drop similar to that shown in 1991. Again we believe the cause of this to be operation of the Grand Valley Project and high flows outside the 1993 rating curve. November 23, 1993 - This major dip is believed 'caused by the operation of the Grand VaHey Project when it began winter power diversions, Late December 1993 - Its believed the cause for zero calculated local inflows during this period is icing problems experienced at the 27.5 Rd Gage. November 7, 1994 - This major dip coincides with the day that the Grand VaHey Canal stopped diverting irrigation water.