Item Prediction Actual
<br />SNI, October through March 289,200 af 298,353 af
<br />SNI, October through April 315,800 af 353,782 af
<br />Type-of-Year Wet N/A
<br />The Districts' 2000 Water Year Operations Plan was based on above average carryover storage
<br />in Lake McConaughy and reservoirs in Wyoming and an anticipated above normal water supply
<br />on the North Platte River. Although above average water supply conditions did occur very early
<br />in the water year (e.g., Lake McConaughy fill in October), lower than expected inflows (about
<br />85% of average during the first half of the water year) occurred as the water year progressed
<br />resulting in less than expected spring storage levels. CNPPID also predicted Lake McConaughy
<br />would fill during the months of March and April. However, no reservoir fill occurred in the
<br />2000 water year after November 22, 1999.
<br />Drought conditions persisted throughout the irrigation season. Low precipitation and dry
<br />conditions lead to lower inflows into Lake McConaughy and decreased natural flow gains
<br />accruing to the Platte River system. The lack of natural flow and high irrigation demand created
<br />numerous water delivery difficulties in the Platte River basin and resulted in one of the largest
<br />irrigation season withdrawal of storage water in recent history.
<br />EA Volume
<br />Because Lake McConaughy was "effectively at capacity" from October 1, 1999 to November 22,
<br />1999, there were no storable inflows and the EA was set at 100,000 af for each day during that
<br />period of time. On Nov. 23, 1999, the EA started accumulating 10 percent of the STTI.
<br />Accumulations and total EA volume during the non-irrigation season were as follows:
<br />Water Year 2000 EA Volume and Release Information and Projections
<br />Month McConaughy
<br />Fill +100K af 10% Storable
<br />Inflows a+ Evap./Seepage
<br />Losses af - EA Releases
<br />af - End of Month EA
<br />Volume af
<br />October 100,000 N/A 0 0 100,000
<br />November 1,970 237 0 101,733
<br />December 7,188 558 0 108,363
<br />Janua 6,970 344 0 114,989
<br />Februa 6,559 293 0 121,255
<br />March 7,148 408 0 127,995
<br />A ril 5,543 1,231 0 132,307
<br />Ma 0 1,149 0 131,158
<br />June 0 1,399 12,992 116,767
<br />Jul 0 1,237 28,165 87,365
<br />Au ust 0 848 33,818 52,699
<br />Sept. 0 838 7,835 44,026
<br />Totals 35,378 8,542 82,810 Carry Over 4-'
<br />Water Year 2001 EA AOP 3 January 3, 2001
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